ST16C452 Datasheet, PDF (1/30 Pages) Exar Corporation – DUAL UART WITH PARALLEL PRINTER PORT

ST16C452
ST16C452PS
DUAL UART WITH PARALLEL
PRINTER PORT
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 compatible 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 compatible 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 become compatible PS/2 operating system.
The 452/452PS is fabricated in an advanced CMOS process with low power consumption.
FEATURES
PLCC Package
Added features in devices with top mark date code of
"F2 YYWW" and newer:
• 5V Tolerant Inputs
• Pin to pin and functional compatible to TL16C452
• 2.97 to 5.5 volt operation
• Software compatible 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 (5, 6, 7, 8)
• Even, odd, or no parity bit generation and detection
• Internal loop-back diagnostics
• TTL compatible inputs, outputs
• Low Power
TXB 10
-DTRB 11
-RTSB 12
-CTSB 13
D0 14
D1 15
D2 16
D3 17
D4 18
D5 19
D6 20
D7 21
N.C. 22
VCC 23
-RTSA 24
-DTRA 25
TXA 26
ST16C452CJ68
ST16C452CJ68PS
60 INTB
59 INTP
58 -SLCTIN
57 INIT
56 -AUTOFDXT
55 -STROBE
54 GND
53 PD0
52 PD1
51 PD2
50 PD3
49 PD4
48 PD5
47 PD6
46 PD7
45 INTA
44 RDOUT
ORDERING INFORMATION
Part number
ST16C452CJ68
ST16C452CJ68PS
ST16C452IJ68
ST16C452IJ68PS
Package
68-Lead PLCC
68-Lead PLCC
68-Lead PLCC
68-Lead PLCC
Operating temperature
0° C to + 70° C
0° C to + 70° C
-40° C to + 85° C
-40° C to + 85° C
Device Status
Active
Active
Active
Active
Rev. 3.20
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone]