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PL-2303HX Edition

USB to Serial Bridge Controller

Product Datasheet

Document Revision: 1.5E Document Release: December 6, 2005

Prolific Technology Inc.

7F, No. 48, Sec. 3, Nan Kang Rd. Nan Kang, Taipei 115, Taiwan, R.O.C. Telephone: +884-2-2654-6363

Fax: +884-2-2654-6161

E-mail: sales@prolific.com.tw Website: http://www.prolific.com.tw

Disclaimer

All the information in this document is subject to change without prior notice. Prolific Technology Inc. does not make any representations or any warranties (implied or otherwise) regarding the accuracy and completeness of this document and shall in no event be liable for any loss of profit or any other commercial damage, including but not limited to special, incidental, consequential, or other damages.

Trademarks

The Prolific logo is a registered trademark of Prolific Technology Inc. All brand names and product names used in this document are trademarks or registered trademarks of their respective holders.

Copyrights

No part of this document may be reproduced or transmitted in any form by any means without the express written permission of Prolific Technology Inc.

Revision History

Revision		Description		Date
1.5E		> Added Operating Current information (Sec 8.2)		December 6, 2005
1.5D		> Modify Operating Temperature Characteristics (Sec 8.4)		April 26, 2005
1.5C		> Modify Features section > Modify List of Tables > Modify notes for Pin Assignment section > Modify DC and Temperature Characteristics section		March 11, 2005
1.5B	> Added Lead-Free Ordering Information		March 8, 2005
1.5		> Added List of Figures and List of Tables > Modify Features section (Sec 1.0) > Improve clarity of Functional Block diagram (Sec 2.0) and Pin Assignment diagram (Sec 4.0) > Change Minimum Operating Temperature to 0^oC.		January 27, 2005
1.4B		> Added IC quantity per reel information (Sec 10.1) > Added Ordering Information (Sec 11.0)		January 19, 2005
1.4	> Added Reel Packing Information		January 6, 2005
1.3		> Modify Minimum Operating Voltage Range to 4.4V > Correct some spelling errors		October 21, 2004
1.2		> Correct page 6 (3.0 Introduction) by removing 5V range: "Flexible signal level requirement on the RS232-like serial port side also allows PL-2303HX to connect directly to any 3.3V~1.8Vrange devices."		April 23, 2004
1.1		> Added notes on Pin Assignment and Description section regarding level and driving capabilities > Modify DC Characteristics table		February 18, 2004
1.0	> PL-2303HX Product Datasheet - Formal Release		February 2004

Prolific

reCHNOLOSY FOR TOMORROW

Table of Contents

1.0 FEATURES....................................................................................................................... 6

2.0 FUNCTIONAL BLOCK DIAGRAM................................................................................. 7

3.0 INTRODUCTION.............................................................................................................. 8

4.0 PIN ASSIGNMENT OUTLINE......................................................................................... 9

5.0 PIN ASSIGNMENT & DESCRIPTION........................................................................... 10

6.0 USB STANDARD DESCRIPTORS .............................................................................. 11

•6.1 Device Descriptor........................................................................................................ 11

•6.2 Configuration Descriptor.............................................................................................. 11

•6.3 Interface Descriptor..................................................................................................... 12

•6.4 Endpoint 1 Descriptor: Interrupt Input Endpoint............................................................. 12

•6.5 Endpoint 2 Descriptor: Bulk Data Output endpoint........................................................ 12

•6.6 Endpoint 3 Descriptor: Bulk Data Input endpoint........................................................... 13

•6.7 String Descriptors........................................................................................................ 13

7.0 USB STANDARD REQUESTS ..................................................................................... 14

8.0 DC & TEMPERATURE CHARACTERISTICS............................................................. 15

•8.1 Absolute Maximum Ratings.......................................................................................... 15

•8.2 DC Characteristics....................................................................................................... 15

•8.3 Clock Characteristics.................................................................................................... 17

•8.4 Temperature Characteristics.......................................................................................... 17

•8.5 Leakage Current and Capacitance................................................................................. 17

•8.6 Power-On Reset........................................................................................................... 18

9.0 OUTLINE DIAGRAM...................................................................................................... 19

9.1 SSOP28 Package......................................................................................................... 19

10.0 REEL PACKING INFORMATION................................................................................ 20

•10.1 Carrier Tape (SSOP-28).............................................................................................. 20

•10.2 Reel Dimension......................................................................................................... 21

11.0 ORDERING INFORMATION........................................................................................ 21

List of Figures

Figure 2-1 Block Diagram of PL-2303HX......................................................................................... 7

Figure 4-1 Pin Assignment Outline of PL-2303HX............................................................................ 9

Figure 8-1 Power-On Reset Diagram ............................................................................................ 18

Figure 9-1 Outline Diagram of PL-2303HX SSOP28....................................................................... 19

Figure 10-1a SSOP28 Carrier Tape............................................................................................... 20

Figure 10-1b IC Reel Placements.................................................................................................. 20

Figure 10-2 Reel Dimension......................................................................................................... 21

List of Tables

Table 5-1 Pin Assignment & Description....................................................................................... 10

Table 6-1 Device Descriptor......................................................................................................... 11

Table 6-2 Configuration Descriptor............................................................................................... 11

Table 6-3 Interface Descriptor....................................................................................................... 12

Table 6-4 Endpoint1 Descriptor.................................................................................................... 12

Table 6-5 Endpoint2 Descriptor.................................................................................................... 12

Table 6-6 Endpoint3 Descriptor.................................................................................................... 13

Table 6-7-1 String Descriptor - Language ID.................................................................................. 13

Table 6-7-2 String Descriptor - Manufacturer.................................................................................. 13

Table 6-7-3 String Descriptor - Product......................................................................................... 14

Table 6-7-4 String Descriptor - Serial Number................................................................................ 14

Table 8-1 Absolute Maximum Ratings........................................................................................... 15

Table 8-2 Operating Voltage and Suspend Current......................................................................... 15

Table 8-2-1 3.3V I/O Pins.............................................................................................................. 15

Table 8-2-2a VDD_325@3.3V Serial I/O Pins................................................................................. 16

Table 8-2-2b VDD_325@2.5V Serial I/O Pins................................................................................. 16

Table 8-2-2c VDD_325@1.8V Serial I/O Pins................................................................................. 16

Table 8-3 Clock Characteristics..................................................................................................... 17

Table 8-4 Temperature Characteristics........................................................................................... 17

Table 8-5 Leakage Current and Capacitance ................................................................................. 17

Table 8-6 Power-On Reset............................................................................................................ 18

Table 9-1 Package Dimension...................................................................................................... 19

Table 10-2 Reel Part Number Information...................................................................................... 21

Table 11-1 Ordering Information.................................................................................................... 21

1.0 Features

•> Fully Compliant with USB Specification v2.0 (Full-Speed)

•> On Chip USB 1.1 transceiver, 5V->3.3V regulator, and 12 MHz crystal oscillator

•> Supports RS232-like Serial Interface

o Full-duplex transmitter and receiver (TXD and RXD)

o Six MODEM control pins (RTS, CTS, DTR, DSR, DCD, and RI)

o 5, 6, 7 or 8 data bits

o Odd, Even, Mark, Space, or None parity mode

o One, one and a half, or two stop bits

o Parity error, frame error, and serial break detection

o Programmable baud rate from 75 bps to 6 Mbps

o External RS232 driver power down control

o Independent power source for serial interface

> Extensive Flow Control Mechanism

o Adjustable high/low watermark level o Automatic flow control with CTS/RTS o Automatic flow control with XON/XOFF o Inbound data buffer overflow detection

> Configurable 512-byte bi-directional data buffer

o 256-byte outbound buffer and 256-byte inbound buffer; or o 128-byte outbound buffer and 384-byte inbound buffer

•> Supports remote wake-up from MODEM input signals

•> Two general purpose I/O (GPIO) pins

•> Optional external EEPROM for startup device configurations

•> Provides drivers support for Windows, Mac OS, Linux, and WinCE

•> Designed for Windows XP Certified Logo Drivers

•> USB-IF Logo Compliant with TID 40002448

•> Small footprint 28-pin SSOP IC package

2.0 Functional Block Diagram

USB 1.1 / 2.0 (Full-Speed)

4X Phase Lock Loop

5 to 3.3V Regulator

12 MHz Oscillator

USB Transceiver

USB Digital Lock Loop

Power Management

USB Serial Interface Engine

Bulk-Out

Endpoint

Bulk-in Endpoint

Control Endpoint

Interrupt Endpoint

256-Byte Configuration Mask ROM

256/384Byte Inbound Data Buffer

256/128Byte

Outbound Data Buffer

2-Wire Serial EEPROM I/F

RS232-Like Serial Interface Engine

RS232-Like I/F

2-Wire EEPROM

Figure 2-1 Block Diagram of PL-2303HX

3.0 Introduction

PL-2303HX provides a convenient solution for connecting an RS232-like full-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. PL-2303HX highly compatible drivers could simulate the traditional COM port on most operating systems allowing the existing applications based on COM port to easily migrate and be made USB ready.

By taking advantage of USB bulk transfer mode, large data buffers, and automatic flow control, PL-2303HX is capable of achieving higher throughput compared to traditional UART (Universal Asynchronous Receiver Transmitter) ports. When real RS232 signaling is not required, baud rate higher than 115200 bps could be used for even higher performance. The flexible baud rate generator of PL-2303HX could be programmed to generate any rate between 75 bps and 6M bps.

PL-2303HX is exclusively designed for mobile and embedded solutions in mind, providing a small footprint that could easily fit in to any connectors and handheld devices. With very small power consumption in either operating or suspend mode, PL-2303HX is perfect for bus powered operation with plenty of power left for the attached devices. Flexible signal level requirement on the RS232-like serial port side also allows PL-2303HX to connect directly to any 3.3V~1.8V range devices.

Revision Date: December 6, 2005

ds_pl2303HX_v15E.doc

4.0 Pin Assignment Outline

Figure 4-1 Pin Assignment Outline of PL-2303HX

- 9 -

Document Version 1.5E

PL-2303HX Product Datasheet

Pin #	Name	Type	Description
1	TXD	O ⁽¹⁾	Serial port (Transmitted Data)
2	DTR_N	O ⁽¹⁾	Serial port (Data Terminal Ready)
3	RTS_N	O ⁽¹⁾	Serial port (Request To Send)
4	VDD_325	P	RS232 VDD. The power pins for the serial port signals. When the serial port is 3.3V, this should be 3.3V. When the serial port is 2.5V, this should be 2.5V.
5	RXD	I ⁽²⁾	Serial port (Received Data)
6	RI_N	I/O ⁽³⁾	Serial port (Ring Indicator)
7	GND	P	Ground
8	NC		No Connect
9	DSR_N	I/O ⁽³⁾	Serial port (Data Set Ready)
10	DCD_N	I/O ⁽³⁾	Serial port (Data Carrier Detect)
11	CTS_N	I/O ⁽³⁾	Serial port (Clear To Send)
12	SHTD_N	O ⁽⁴⁾	RS232 Transceiver Shut Down Control
13	EE_CLK	I/O ⁽⁵⁾	2-Wire Serial EEPROM Clock
14	EE_DATA	I/O ⁽⁵⁾	2-Wire Serial EEPROM Data
15	DP	I/O	USB port D+ signal
16	DM	I/O	USB port D- signal
17	VO_33	P	Regulator Power Output, 3.3V
18	GND	P	Ground
19	NC		No Connect
20	VDD_5	P	USB port V_BUS, 5V Power.
21	GND	P	Ground
22	GP0	I/O ⁽⁷⁾	General Purpose I/O Pin 0
23	GP1	I/O ⁽⁷⁾	General Purpose I/O Pin 1
24	NC		No Connect
25	GND_A	P	Analog Ground for PLL
26	PLL_TEST	I (6)	PLL test mode control
27	OSC1	I	Crystal oscillator input
28	OSC2	I/O	Crystal oscillator output

Table 5-1 Pin Assignment & Description

Notes:

(1) - CMOS Out, Output Pad. Level and Driving Capability decided by VDD_325.

(2) - SCHMITT In, 5V Tolerant, Input Pad. Level and Driving Capability decided by VDD_325.

(3) - SCHMITT In/CMOS Out, 5V Tolerant, Bi-directional Pad. Level and Driving Capability decided by VDD_325.

(4) - CMOS Out, 3.3V, Output Pad, 4mA Output Driving Capability.

(5) - SCHMITT In/CMOS Out, 5V Tolerant, Bi-directional Pad with internal resistor pulling-up to 3.3V, 4mA Output Driving

Capability.

(6) - LVTTL In, 3.3V, Input Pad.

(7) - SCHMITT In/CMOS Out, 5V Tolerant, Bi-directional Pad, 4mA Output Driving Capability.

5.0 Pin Assignment & Description

6.0 USB Standard Descriptors

PL-2303HX supports one configuration with one interface and four endpoints. The descriptors are basically stored in an internal Mask ROM. However, some fields could be optionally modified by properly programmed external 2-wire serial EEPROM. The contents of all descriptors are shown in the following sections.

6.1 Device Descriptor

Table 6-1 Device Descriptor

Offset	Field	Size	Value	Description
0	bLength	Byte	12H	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	01H	DEVICE descriptor type
2	bcdUSB	Word	0110H	USB Specification Release Number 1.1
4	bDeviceClass	Byte	00H
5	bDeviceSubClass	Byte	00H
6	bDeviceProtocol	Byte	00H
7	bMaxPacketSize0	Byte	40H	Maximum packet size for endpoint zero is 64
8	idVender	Word	067BH	Vender ID ⁽¹⁾
10	idProduct	Word	2303H	Product ID ⁽¹⁾
12	bcdDevice	Word	0300H	Device Release Number ⁽¹⁾
14	iManufacturer	Byte	01H	Manufacturer string descriptor index
15	iProduct	Byte	02H	Product name string descriptor index
16	iSerialNumber	Byte	00H/03H	Serial number string descriptor index ⁽²⁾
17	bNumConfigurations	Byte	01H	One configuration.

Notes:

•(1) - The Vender ID, Product ID, and Device Release Number could be replaced by the contents of external EEPROM.

•(2) - The serial number string descriptor index could be defined by the contents of external EEPROM. If specified, the index will

be 3 instead of 0.

Offset	Field	Size	Value	Description
0	bLength	Byte	09h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	02h	CONFIGURATION descriptor type
2	wTotalLength	Word	0027h	Total length of data returned for this configuration.
4	bNumInterface	Byte	01h	One interface for this device.
5	bConfigurationValue	Byte	01h
6	Configuration	Byte	00h
7	bmAttributes	Byte	A0h/80h	Characteristic attributes ⁽³⁾
8	MaxPower	Byte	32h/FAh	Maximum power consumption ⁽⁴⁾

Table 6-2 Configuration Descriptor

Notes:

(3) - The Remote Wakeup attribute (bit 5) depends on the settings of the Remote Wakeup Enable (Setting in the Device

Configuration Registers, DCR, of PL-2303HX). If all remote wakeup sources are disabled, the bmAttributes will be 80h. Otherwise, A0h is returned to indicate that this device is Remote Wakeup capable.

6.2 Configuration Descriptor

(4) - The value of maximum power consumption can be configured initially by setting DCR on the external EEPROM. If it is set to 1, the MaxPower byte will be FAh to indicate 500mA required from the USB host. Otherwise, it is 32h that indicates 100mA required.

6.3 Interface Descriptor

Table 6-3 Interface Descriptor

Offset	Field	Size	Value	Description
0	BLength	Byte	09h	Size of this descriptor (in bytes)
1	BDescriptorType	Byte	04h	INTERFACE descriptor type
2	BInterfaceNumber	Byte	00h	One interface only
3	BAlternateSetting	Byte	00h	No alternate interface
4	BNumEndpoints	Byte	03h	Three endpoints (excluding control endpoint)
5	BInterfaceClass	Byte	FFh	Vendor Specific Class
6	BInterfaceSubClass	Byte	00h
7	BInterfaceProtocol	Byte	00h
8	Interface	Byte	00h

6.4 Endpoint 1 Descriptor: Interrupt Input Endpoint

Table 6-4 Endpoint1 Descriptor

Offset	Field	Size	Value	Description
0	bLength	Byte	07h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	05h	ENDPOINT descriptor type
2	bEndpointAddress	Byte	81h	Input endpoint
3	bmAttributes	Byte	03h	Transfer type is INTERRUPT
4	wMaxPacketSize	Word	000Ah	Ten Bytes
6	bInterval	Byte	01h	Polling on every 1 ms interval

Offset	Field	Size	Value	Description
0	bLength	Byte	07h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	05h	ENDPOINT descriptor type
2	bEndpointAddress	Byte	02h	Output endpoint
3	bmAttributes	Byte	02h	Transfer type is BULK
4	wMaxPacketSize	Word	0040h	64 bytes
6	bInterval	Byte	00h	Ignored field

Table 6-5 Endpoint2 Descriptor

6.5 Endpoint 2 Descriptor: Bulk Data Output endpoint

6.6 Endpoint 3 Descriptor: Bulk Data Input endpoint

Table 6-6 Endpoint3 Descriptor

Offset	Field	Size	Value	Description
0	bLength	Byte	07h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	05h	ENDPOINT descriptor type
2	bEndpointAddress	Byte	83h	Input endpoint
3	bmAttributes	Byte	02h	Transfer type is BULK
4	wMaxPacketSize	Word	0040h	64 bytes
6	bInterval	Byte	00h	Ignored field

6.7 String Descriptors

PL-2303HX supports four string descriptors:

•> Language ID

•> Manufacturer

•> Product

•> Serial Number

Except for Serial Number, the other three string descriptors are stored in the internal Mask ROM, i.e. their contents are fixed. Serial Number is a special case. If the External EEPROM were not present, or not properly programmed, then Serial Number would be hidden from the system. If the External EEPROM is presented and properly programmed, then Serial Number will be read from the EEPROM.

The following tables demonstrate the current defined value for each descriptor: 6.7.1 String Descriptor 0 - Language ID

Table 6-7-1 String Descriptor - Language ID

Offset	Field	Size	Value	Description
0	bLength	Byte	04h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	03h	STRING descriptor type
2	bLANGID[0]	Word	0409h	English (United States)

Offset	Field	Size	Value	Description
0	BLength	Byte	32h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	03h	STRING descriptor type
2	bSTRING	-	=>	"Prolific Technology Inc." in UNICODE

Table 6-7-2 String Descriptor - Manufacturer

6.7.2 String Descriptor 1 - Manufacturer

6.7.3 String Descriptor 2 - Product

Table 6-7-3 String Descriptor - Product

Offset	Field	Size	Value	Description
0	Blength	Byte	2Ch	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	03h	STRING descriptor type
2	bSTRING	-	=>	"USB-Serial Controller" in UNICODE

6.7.4 String Descriptor 3 - Serial Number

Table 6-7-4 String Descriptor - Serial Number

Offset	Field	Size	Value	Description
0	bLength	Byte	12h	Size of this descriptor (in bytes)
1	bDescriptorType	Byte	03h	STRING descriptor type
2	bSTRING	-	=>	"X7X6X5X4X3X2X1X0" in UNICODE

Note:

The size of Serial Number is fixed in PL-2303HX design. It must be exactly 8 UNICODE characters (or 16 bytes). Note that in USB Specification, this serial number must be unique for each device.

7.0 USB Standard Requests

PL-2303HX supports the following USB standard requests. For non-supported requests or requests with invalid parameters, PL-2303HX will respond with STALL packet.

•> Clear Feature

•> Get Configuration

•> Get Descriptor

•> Get Status

o Device Status

o Interface Status

o Endpoint 0, 1, 2, and 3 Status

•> Set Address

•> Set Configuration

•> Set Feature

•8.0 DC & Temperature Characteristics

•8.1 Absolute Maximum Ratings

Table 8-1 Absolute Maximum Ratings

Items	Ratings
Power Supply Voltage	-0.3 to 5.5 V
Input Voltage of 3.3V I/O	-0.3 to VO_33 + 0.3 V
Input Voltage of 3.3V I/O with 5V Tolerance I/O	-0.3 to VDD_5 + 0.3V
Output Voltage of 3.3V I/O	-0.3 to VO_33 + 0.3 V
Storage Temperature	-40 to 150 ^oC

8.2 DC Characteristics

Table 8-2 Operating Voltage and Suspend Current

Parameter	Symbol	Min	Typ	Max	Unit
Operating Voltage Range	VDD_5	3.6	5	5.5	V
Regulator Output Driving Current (VDD_5= 5V)	Iload	-	-	150	mA
Operating Current⁽¹⁾ (Power Consumption)	^IDD	-	10	15	mA
Suspend Current	^ISUS	-	400	450	u.A

Note: (1) - No device connected.

Parameter	Symbol	Min	Typ	Max	Unit
Output Driving Capability	Idd	--	4	--	mA
Output Voltage of Regulator	VO_33	3.0	3.3	3.6	V
Input Voltage (CMOS)
Low	Vil	--	--	0.3* VO_33	V
High	Vih	0.7* VO_33	--	--	V
Input Voltage (LVTTL)
Low	Vil	--	--	0.8	V
High	Vih	2.0	--	--	V
Schmitt Trigger Threshold Voltage
Negative going	Vt-	0.9	1.2	--	V
Positive going	Vt+	--	2.1	2.5	V
Output Voltage, 3.3V
Low	Vol	--	--	0.4	V
High	Voh	2.4	--	--	V

Table 8-2-1 3.3V I/O Pins

8.2.1 3.3V I/O Pins

8.2.2 Serial I/O Pins

Table 8-2-2a VDD_325@3.3V Serial I/O Pins

Parameter	Symbol	Min	Typ	Max	Unit
Output Driving Capability		--	4	--	mA
Power Supply for Serial I/O Pins	VDD_325	3.0	3.3	3.6	V
Input Voltage
Low	Vil	--	--	0.8	V
High	Vih	2.0	--	--	V
Schmitt Trigger Threshold Voltage
Negative going	Vt-	0.8	1.1	--	V
Positive going	Vt+	--	1.6	2.0	V
Output Voltage
Low	Vol	--	--	0.4	V
High	Voh	2.4	--	--	V

Table 8-2-2b VDD_325@2.5V Serial I/O Pins

Parameter

Symbol

Min

Typ

Max

Unit

Output Driving Capability

2.6

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