Release Date:

July, 2002

ds_pl2303_v14

PL-2303 Product Datasheet

- 5 -

Document Revision 1.3

Overview

The PL-2303 operates as a bridge between one USB port and one standard RS232 Serial port. The two

large on-chip buffers accommodate data flow from two different buses. The USB bulk-type data is adopted

for maximum data transfer. Automatic handshake is supported at the Serial port. With these, a much higher

baud rate can be achieved compared to the legacy UART controller.

This device is also compliant with USB power management and remote wakeup scheme. Only minimum

power is consumed from the host during Suspend. By integrating all the function in a SOIC-28 package, this

chip is suitable for cable embedding. Users just simply hook the cable into PC or hub’s USB port, and then

they can connect to any RS-232 devices.

Pin Description

Table 1. Pins Description

Pin

No.

Name

Type

Description

1

TXD

O

Data output to Serial port

2

DTR_N

O

Data Terminal Ready, active low

3

RTS_N

O

Request To Send, active low

4

VDD_232

P

RS-232 VDD. The RS-232 output signals (Pin 1 ~ Pin 3) are

designed for 5V, 3.3V or 3V operation. VDD_232 should be

connected to the same power level of the RS-232 interface.

(The RS-232 input signals are always 5V~3V tolerant.)

Note: This document version only provides 5V DC characteristic

information. Refer to future revisions for updates.

5

RXD

I

Data input from Serial Bus

6

RI_N

I

Ring Indicator, active low

7

GND

P

Ground

8

VDD

P

Power

9

DSR_N

I

Data Set Ready, active low

10

DCD_N

I

Data Carrier Detect, active low

11

CTS_N

I

Clear To Send, active low

12

SHTD_N

O

Shut Down RS232 Transceiver

13

EE_CLK

I/O

During Reset, this pin is input for simulation purpose. During

normal operation, this pin is Serial ROM clock

14

EE_DATA

I/O

Serial ROM data signal

15

DP

I/O

USB DPLUS signal

16

DM

I/O

USB DMINUS signal

17

VDD_3V3

P

3.3V power for USB transceiver

18

GND_3V3

P

3.3V ground

19

RESET

I

System Reset

20

VDD

P

Power

21

GND

P

Ground