EXAR Corporation, 48720 Kato Road, Fremont, CA 94538

• (510) 668-7000 • FAX (510) 668-7017

XR68C92/192

PLCC Package

DESCRIPTION

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

bytes transmit and receive FIFO. The XR68C92/192 is a pin-to-pin compatible and an improved version of the

XR68C681 and the Philips SCC68692 UART with faster data access and other additional features. The operating

speed of the receiver and transmitter can be selected independently from a table of eighteen 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

Added features in devices with top marking of "D2" and

newer:

• 5 volt tolerant inputs

• Pin to pin compatible and improved version of the

SCC68692 and XR68C681

• Enhanced Multidrop mode operation with separate

storage for address and data tags (9th bit)

• 8 Bytes transmit/receive FIFO (XR68C92)

•16 Bytes transmit/receive FIFO (XR68C192)

• Standard baud rates from 50bps to 230.4kbps

• Non-standard baud rate of up to 1Mbps

• Transmit and Receive trigger levels

• Watch dog timer

• Programmable clock source for receiver and trans-

mitter of each channel

• Single interrupt output

• 7 Multipurpose inputs, 8 Multipurpose outputs

• 2.97 to 5.5 volt operation

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

• Parity, framing, and over run error detection

• Programmable 16-bit timer/counter

• On-chip crystal oscillator

• Powerdownmode

DUAL UNIVERSAL ASYNCHRONOUS

RECEIVER AND TRANSMITTER

August 2005

7

8

9

10

11

12

13

14

15

16

17

39

38

37

36

35

34

33

32

31

30

29

A3

IP0

R/-W

-DTACK

RXB

N.C.

TXB

OP1

OP3

OP5

OP7

-CS

-RESET

XTAL2

XTAL1

RXA

N.C.

TXA

OP0

OP2

OP4

OP6

XR68C92

XR68C192

Part number

Package

Operating temperature Device Status

XR68C92CP

40-Lead PDIP

0° C to + 70° C

Active. See the XR68C92CV for new designs.

XR68C92CJ

44-Lead PLCC

0° C to + 70° C

Active

XR68C92CV

44-Lead LQFP

0° C to + 70° C

Active

XR68C92IP

40-Lead PDIP

-40° C to + 85° C

Active. See the XR68C92IV for new designs.

XR68C92IJ

44-Lead PLCC

-40° C to + 85° C

Active

XR68C92IV

44-Lead LQFP

-40° C to + 85° C

Active

XR68C192CJ 44-Lead PLCC

0° C to + 70° C

Active

XR68C192CV 44-Lead LQFP

0° C to + 70° C

Active

XR68C192IJ

44-Lead PLCC

-40° C to + 85° C

Active

XR68C192IV

44-Lead LQFP

-40° C to + 85° C

Active

ORDERING INFORMATION

Rev. 1.33