ST16C552 Datasheet, PDF (1/39 Pages) Exar Corporation – DUAL UART WITH 16-BYTE FIFO AND PARALLEL PRINTER PORT

ST16C552
ST16C552A
DUAL UART WITH 16-BYTE FIFO AND
PARALLEL PRINTER PORT
DESCRIPTION
December 2003
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.
FEATURES
PLCC Package
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
TXB 10
-DTRB 11
-RTSB 12
-CTSB 13
D0 14
D1 15
D2 16
D3 17
D4 18
D5 19
D6 20
D7 21
-TXRDYA 22
VCC 23
-RTSA 24
-DTRA 25
TXA 26
ST16C552CJ68
ST16C552ACJ68
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
ST16C552CJ68
ST16C552ACJ68
ST16C552IJ68
ST16C552AIJ68
Pins
68
68
68
68
Package
PLCC
PLCC
PLCC
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. 3.40
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone]