
Prolific Technology Inc. 
7F, #48, Sec.3, Nan-Kang Rd., Taipei, Taiwan 115, ROC 
Tel: 886-2-2654-6363   Fax: 886-2-2654-6161 
E-mail: 
sales@prolific.com.tw
http://www.prolific.com.tw 
PL-2351 Product Brochure
V1.0 04/12/02
Overview 
PL-2351 is a single chip full-speed USB device controller, including an enhanced 8032 core, an intelligent 
USB core, 4-channel 8bit/12bit ADC and a variety of smart I/O ports via programmable DMA interface.  With 
diversity of IO ports, PL-2351 offers an optimal solution for a list of extensive peripherals such as printers, 
keyboards, mice, modems, hard disks, CMOS sensors, microphones, etc.  Flexible endpoint configuration 
including its buffer partition lets users easily establish control, isochronous-in/out, bulk-in/out or 
interrupt-In/out pipes to communicate with USB host.  In addition, with the capability of supporting up to five 
USB addresses, it is possible to configure the chip as a composite or a compound device.  Designed to be 
flexible, high performance, and easy-to-use, PL-2351 can help customers easily implement their products. 
Block Diagram
USB Device Controller
PL-2351 
Features 
 
USB 1.1 Specification compliant 
 
4-phase 80C32-compatible controller running up to 48 
MHz 
 
Capable of supporting USB HID class, Mass-storage  
class and Printer class 
 
Embedded 5V~ 3.3V 100mA regulator for USB interface 
and internal circuit  
 
Default control endpoint and 15 programmable endpoints 
 
Support up to five USB addresses for compound 
or composite device 
 
4K SRAM and Memory Access Unit (MAU) to configure 
each endpoint’s buffer partition 
 
Programmable-DMA (PDMA) controller supports generic 
parallel interface such as CMOS Sensor, EPP/ECP, 
ATAPI, 8237 DMA, etc. 
 
Three configurable serial ports. Each serial port can be 
configured as a generic serial port up to 1.25Mbps or a 
PS2 host. 
 
Four 8bit/12bit ADC with sampling rate up to 24 KHz 
 
16 extra GPIO pins. 8 of them can be configured as level 
or edge sensitive triggered interrupt sources. 
 
Advanced interrupt mechanism to ease the handshake 
overhead 
 
Advanced power management mechanism 
 
32K * 8 embedded ROM 
 
2 16-bit programmable timer 
 
Watch dog timer (WDT) 
 
Capable of supporting 2-wire EEPROM 
8bit / 48MHz 
Micro-Controller
(80C32 compatible)
ROM 
General Purpose
Controller
Serial Port 
Controller 
(3 Channels)
Analog to Digital
Controller 
Programmable
DMA Controller
RAM/FIFO 
Phase
Lock
Loop
12 MHz
C
l
USB Interface
28-pin GPIO
8/16-bit DMA
Analog
Signal 
Input 
Serial/
PS/2 
Port 
USB Transceiver
USB SIE
USB Controller
5V 
5V–3.3V
Regulator
3.3V