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