ST162552 Datasheet, PDF (1/28 Pages) Exar Corporation – DUAL ASYNCHRONOUS RECEIVER/TRANSMITTER WITH FIFOs

STARTECH
ST16C2552
An
Company
Printed December 17, 1996
DUAL ASYNCHRONOUS RECEIVER/TRANSMITTER WITH FIFOs
DESCRIPTION
The ST16C2552 is a dual asynchronous receiver and
transmitter with 16 byte transmit and receive FIFOs.
Independent programmable baud rate generators are
provided to select transmit and receive clock rates
from 50Hz to 1.5 MHz for each UART.
The on board status registers of the ST16C2552
provide the error conditions, type and status of the
transfer operation being performed. Complete MO-
DEM control capability and a processor interrupt
system that may be software tailored to the user’s
requirements are included. The ST16C2552 provides
internal loop-back capability for on board diagnostic
testing.
Signalling for DMA transfers is done through two pins
per channel ( TXRDY*, RXRDY* ). The RXRDY*
function is multiplexed on one pin with the OP2* and
BAUDOUT functions. CPU can select these functions
through the Alternate Function Register.
The ST16C2552 is fabricated in an advanced 0.6m
CMOS process to achieve low power and high speed
requirements.
PLCC Package
D5 7
D6 8
D7 9
A0 10
XTAL1 11
GND 12
XTAL2 13
A1 14
A2 15
CHSEL 16
INTB 17
ST16C2552CJ44
39 RXA
38 TXA
37 DTRA*
36 RTSA*
35 MFA*
34 INTA
33 VCC
32 TXRDYB*
31 RIB*
30 CDB*
29 DSRB*
FEATURES
· Pin to pin and functional compatible to National
NS16C552
· 16 byte transmit FIFO
· 16 byte receive FIFO with error flags
· Modem control signals (CTS*, RTS*, DSR*, DTR*,
RI*, CD*)
· Programmable character lengths (5, 6, 7, 8) bits
· Even, odd, or no parity bit generation and detection
· Status report register
· TTL compatible inputs, outputs
· Independent transmit and receive control
· Software compatible with INS8250, NS16C550
· 460.8 kHz transmit/receive operation with 7.372
MHz crystal or external clock source
N.C. 1
D5 2
D6 3
D7 4
A0 5
XTAL1 6
GND 7
XTAL2 8
A1 9
A2 10
CHSEL 11
INTB 12
ORDERING INFORMATION
Part number
ST16C2552CJ44
ST16C2552IJ44
Rev. 2.0
Package
PLCC
PLCC
Operating temperature
0° C to + 70° C
-40° C to + 85° C
3-135
ST16C2552CQ48
36 RXA
35 TXA
34 DTRA*
33 RTSA*
32 MFA*
31 INTA
30 VCC
29 TXRDYB*
28 RIB*
27 CDB*
26 DSRB*
25 N.C.