EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017
ST16C552
ST16C552A
PLCC Package
DUAL UART WITH 16-BYTE FIFO AND
PARALLEL PRINTER PORT
December 2003
Rev. 3.40
DESCRIPTION
The ST16C552/ST16C552A (552/552A) 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 552/552A provides enhanced UART functions with 16 byte FIFO’s, 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 552/552A is available in a 68 pin PLCC package. The 552/552A is compatible
with the 16C450 and 16C550. The difference between the ST16C552 and ST16C552A is the logic state of the
printer port, INTP interrupt. The INTP interrupt is active high (logic 1) on the ST16C552 whereas INTP is active
low (logic 0) on the ST16C552A part when the interrupt latch mode is selected. The 552/552A is fabricated in an
advanced CMOS process with power down mode to reduce the power consumption. The 552A does not support
the power down mode.
-RXRDYA
-CDB
GND
-RIB
-DSRB
CLK
-CSB
GND
BIDEN
ACK
PE
-BUSY
SLCT
VCC
ERROR
RXB
-RXRDYB
GND
-CTSA
-CDA
-RIA
-DSRA
-CSA
A2
A1
A0
-IOW
-IOR
-CSP
-RESET
VCC
RXA
-TXRDYB
INTSEL
9
8
7
6
5
4
3
2
1
68
67
66
65
64
63
62
61
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
FEATURES
Added features in device revision "F" and newer:
• 5V Tolerant Inputs
• Pin to pin and functional compatible to ST16C452/
452PS, TL16C552
• 2.97 to 5.5 volt operation
• Software compatible with INS8250, NS16C550
• 1.5 Mbps transmit/receive operation (24MHz)
• 16 byte transmit FIFO
• 16 byte receive FIFO with error flags
• 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
• TTL compatible inputs, outputs
• Power down mode
ORDERING INFORMATION
Part number Pins Package Operating temperature Device Status
ST16C552CJ68 68 PLCC 0° C to + 70° C Active
ST16C552ACJ68 68 PLCC 0° C to + 70° C Active
ST16C552IJ68 68 PLCC -40° C to + 85° C Active
ST16C552AIJ68 68 PLCC -40° C to + 85° C Active
