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
6
5
4
3
2
1
44
43
42
41
40
7
8
9
10
11
12
13
14
15
16
17
39
38
37
36
35
34
33
32
31
30
29
18
19
20
21
22
23
24
25
26
27
28
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
D1
D3
D5
D7
GN
D
N.
C
.
-IN
T
D6
D4
D2
D0
A2
IP
1
A1
IP
3
A0
N.
C
.
VCC
IP
4
IP
5
-IA
C
K
IP
2
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