ST16C452PS Datasheet | Exar

DESCRIPTION March 2004 The ST16C452/ST16C452PS (452/452PS) is a dual universal asynchronous receiver and transmitter (UART) with an added bi-directional parallel port that is directly patible with a CENTRONICS type printer. The parallel port is designed such that the user can configure it as general purpose I/O interface, or for connection to other printer devices. The 452/452PS provides enhanced UART functions, a modem control interface, and data rates up to 1.5Mbps. Onboard status registers provide the user with error indications and operational status. The system interrupts and control may be tailored to meet user requirements. An internal loop-back capability allows onboard diagnostics. A programmable baud rate generator is provided to select transmit and receive clock rates from 50 bps to 1.5 Mbps. The 452/452PS is available in a 68 pin PLCC package. The 452/452PS is patible with the 16C450. The 452 is available in two versions, the ST16C452 and the ST16C452PS. The ST16C452 provides single hardware pin to control the printer port data direction while the 452PS provides an additionally software control bit to control the printer port data direction to bee patible PS/2 operating system. The 452/452PS is fabricated in an advanced CMOS process with low power consumption. FEATURES PLCC Package 9 N.C. 8 -CDB 7 GND 6 -RIB 5 -DSRB 4 CLK 3 -CSB 2 GND 1 BIDEN 68 ACK 67 PE 66 -BUSY 65 SLCT 64 VCC 63 ERROR 62 RXB 61 N.C. Added features in devices with top mark date code of "F2 YYWW" and newer: - 5V Tolerant Inputs - Pin to pin and functional patible to TL16C452 - 2.97 to 5.5 volt operation - Software patible with ST16C450, NS16C450 - 1.5 Mbps transmit/receive operation (24MHz) - Independent transmit and receive control - Modem and printer status registers - UART port and printer port Bi-directional - Printer port direction set by single control bit or 8 bit pattern (AA/55) - Modem control signals (-CTS, -RTS, -DSR, -DTR, -RI, -CD) - Programmable character lengths...