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
• Power down mode
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
GND
N.C.
-INT
D6
D4
D2
D0
A2
IP1
A1
IP3
A0
N.C.
VCC
IP4
IP5
-IACK
IP2
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
