DUAL UNIVERSAL ASYNCHRONOUS
RECEIVER AND TRANSMITTER
May 2000
XR68C92/192
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
鈥in
to pin and functionally compatible to XR68C681
and SCC68692
鈥ull
duplex transmit and receive operation
鈥?
bytes of transmit/receive FIFOs (XR68C92)
鈥?6
bytes of transmit/receive FIFOs (XR68C192)
鈥rogrammable
character lengths (5, 6, 7, 8)
鈥arity,
framing, and over run error detection
鈥rogrammable
16-bit timer/counter
鈥n-chip
crystal oscillator
鈥ingle
interrupt output with eight selectable interrupt-
ing conditions
鈥xternal
1X or 16X clock
鈥ata
rate up to 1Mbps
鈥ndependent
transmit and receive baud rates from
50bps to 230.4kbps
鈥?
General purpose inputs
鈥?
General purpose outputs
鈥TL
compatible inputs, outputs
鈥?
Transmit/receive trigger levels
鈥atch
dog timer
鈥ulti-drop
mode compatible with 8051 nine bit mode
鈥?.3
or 5 volts operation
鈥oopback
modes
鈥ower
down mode
PLCC Package
-IACK
41
VCC
N.C.
IP1
IP3
IP4
IP5
IP2
40
39
38
37
36
35
A3
A2
A1
44
43
42
6
5
4
3
2
1
A4
IP 0
R /-W
-D T A C K
RXB
N .C .
TXB
OP1
OP3
OP5
OP7
7
8
9
10
11
12
13
14
15
16
17
D1 18
D3 19
D5 20
D7 21
GND 22
N.C. 23
-INT 24
D6 25
D4 26
D2 27
D0 28
-C S
-R E S E T
XTAL2
XTAL1
RXA
N .C .
TXA
OP0
OP2
OP4
OP6
X R 68 C 9 2
X R 68 C 1 92
34
33
32
31
30
29
ORDERING INFORMATION
Part number
Pins Package
Operating temperature
Part number
Pins PackageOperating temperature
XR68C92CP
XR68C92CJ
XR68C92CV
XR68C92IP
XR68C92IJ
XR68C92IV
40
44
44
40
44
44
PDIP
PLCC
TQFP
PDIP
PLCC
TQFP
0擄 C
0擄 C
0擄 C
-40擄 C
-40擄 C
-40擄 C
to + 70擄 C
to + 70擄 C
to + 70擄 C
to + 85擄 C
to + 85擄 C
to + 85擄 C
XR68C192CP
XR68C192CJ
XR68C192CV
XR68C192IP
XR68C192IJ
XR68C192IV
40
44
44
40
44
44
PDIP
PLCC
TQFP
PDIP
PLCC
TQFP
0擄 C
0擄 C
0擄 C
-40擄 C
-40擄 C
-40擄 C
to + 70擄 C
to + 70擄 C
to + 70擄 C
to + 85擄 C
to + 85擄 C
to + 85擄 C
Rev. P2.10
www.exar.com
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
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