EXAR Corporation, 48720 Kato Road, Fremont, CA 94538

• (510) 668-7000 • FAX (510) 668-7017

XR68C92/192

Rev. P2.10

PLCC Package

DUAL UNIVERSAL ASYNCHRONOUS

RECEIVER AND TRANSMITTER

DESCRIPTION

The XR68C92/192 is a Dual Universal Asynchronous Receiver and Transmitter with 8 (XR68C92) or 16 (XR68C192)

bytes of transmit and receive FIFOs. The XR68C92/192 is pin-to-pin and functionally compatible to the XR68C681

and Philips SCC68681 UART with additional features. The operating speed of the receiver and transmitter can be

selected independently from a table of twenty four fixed baud rates, a 16X clock derived from a programmable counter/

timer, or an external 1X or 16X clock. The baud rate generator and counter/timer can operate directly from a crystal

or from external clock input. The XR68C92/192 provides a power down mode in which the oscillator is stopped but

the register contents are retained. The XR68C92/192 is fabricated in an advanced CMOS process to achieve low power

and high speed requirements.

FEATURES

•Pin to pin and functionally compatible to XR68C681

and SCC68692

•Full duplex transmit and receive operation

•8 bytes of transmit/receive FIFOs (XR68C92)

•16 bytes of transmit/receive FIFOs (XR68C192)

•Programmable character lengths (5, 6, 7, 8)

•Parity, framing, and over run error detection

•Programmable 16-bit timer/counter

•On-chip crystal oscillator

•Single interrupt output with eight selectable interrupt-

ing conditions

•External 1X or 16X clock

•Data rate up to 1Mbps

•Independent transmit and receive baud rates from

50bps to 230.4kbps

•6 General purpose inputs

•8 General purpose outputs

•TTL compatible inputs, outputs

•4 Transmit/receive trigger levels

•Watch dog timer

•Multi-drop mode compatible with 8051 nine bit mode

•3.3 or 5 volts operation

•Loopback modes

•Power down mode

ORDERING INFORMATION

Part number

Pins Package

Operating temperature

XR68C92CP

40

PDIP

0° C to + 70° C

XR68C92CJ

44

PLCC

0° C to + 70° C

XR68C92CV

44

TQFP

0° C to + 70° C

XR68C92IP

40

PDIP

-40° C to + 85° C

XR68C92IJ

44

PLCC

-40° C to + 85° C

XR68C92IV

44

TQFP

-40° C to + 85° C

Part number

Pins PackageOperating temperature

XR68C192CP

40

PDIP

0° C to + 70° C

XR68C192CJ

44

PLCC

0° C to + 70° C

XR68C192CV

44

TQFP

0° C to + 70° C

XR68C192IP

40

PDIP

-40° C to + 85° C

XR68C192IJ

44

PLCC

-40° C to + 85° C

XR68C192IV

44

TQFP

-40° C to + 85° C

May 2000

www.exar.com

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16

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39

38

37

36

35

34

33

32

31

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29

A4

IP 0

R/-W

-D T A C K

RXB

N.C.

TX B

OP 1

OP 3

OP 5

OP 7

-C S

-R ES ET

XT A L 2

XT A L 1

RXA

N.C.

TX A

OP 0

OP 2

OP 4

OP 6

XR 68 C 9 2

X R 68 C 1 92