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Exar Corporation

XR16C864 Datasheet Preview

XR16C864 Datasheet

2.97V TO 5.5V QUAD UART

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XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
APRIL 2004
GENERAL DESCRIPTION
FEATURES
REV. 2.0.1
The XR16C8641 (864) is an enhanced quad
Universal Asynchronous Receiver and Transmitter
(UART) each with 128 bytes of transmit and receive
FIFOs, transmit and receive FIFO counters and
trigger levels, automatic hardware and software flow
control, automatic RS-485 half-duplex direction
control and data rates of up to 2 Mbps. Each UART
has a set of registers that provide the user with
operating status and control, receiver error
indications, and modem serial interface controls.
System interrupts may be tailored to meet design
requirements. An internal loopback capability allows
onboard diagnostics. The 864 is available in the 100-
pin QFP package. The XR16C864 offers faster
channel status access by providing separate outputs
for TXRDY and RXRDY, offer separate Infrared TX
outputs and a separate clock input for channel C
(CHCCLK). The XR16C864 is compatible with the
industry standard ST16C554/554D, ST16C654/654D
and XR16C854/854D.
NOTE: 1 Covered by U.S. Patent #5,649,122 and #5,949,787.
Added feature in devices with top mark date code of
"F2 YYWW" and newer:
s 5 volt tolerant inputs
2.97 to 5.5 Volt Operation
Pin-to-pin compatible with the industry standard
ST16C554 and ST16C654 and TI’s TL16C554N
and TL16C754BFN
Intel or Motorola Data Bus Interface select
Four independent UART channels
s Register Set Compatible to 16C550
s Data rates of up to 2 Mbps
s Transmit and Receive FIFOs of 128 bytes
s Programmable TX and RX FIFO Trigger Levels
s Transmit and Receive FIFO Level Counters
s Automatic Hardware (RTS/CTS) Flow Control
s Selectable Auto RTS Flow Control Hysteresis
s Automatic Software (Xon/Xoff) Flow Control
s Wireless Infrared (IrDA 1.0) Encoder/Decoder
Sleep Mode (200 uA typical)
Crystal oscillator or external clock input
APPLICATIONS
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FIGURE 1. XR16C864 BLOCK DIAGRAM
Portable Appliances
Telecommunication Network Routers
Ethernet Network Routers
Cellular Data Devices
Factory Automation and Process Controls
A2:A0
D7:D0
IOR#
IO W #
CS# A-D
INT A-D
TXRDY# A-D
RXRDY# A-D
Reset
16/68#
INTSEL
CLKSEL
CHCCLK
TC
AEN
DACK A-D
TXDRQ# A-D
RXDRQ# A-D
XTAL1
XTAL2
BCLK A-D
Intel or
M o to ro la
Data Bus
Interface
Direct
Memory
Access
Crystal Osc/Buffer
5V tolerant inputs (except XTAL1)
UART Channel A
UART
Regs
BRG
128 Byte TX FIFO
TX & RX
IR
ENDEC
128 Byte RX FIFO
UART Channel B
(same as Channel A)
UART Channel C
(same as Channel A)
UART Channel D
(same as Channel A)
2.97V to 5.5V VCC
TXA, RXA, IRTXA, DTRA#,
DSRA#, RTSA#, CTSA#,
CDA#, RIA#, OP2A#,
OP1A#/RS-485
TXB, RXB, IRTXB, DTRB#,
DSRB#, RTSB#, CTSB#,
CDB#, RIB#, OP2B#,
OP1B#/RS-485
TXC, RXC, IRTXC, DTRC#,
DSRC#, RTSC#, CTSC#,
CDC#, RIC#, OP2C#,
OP1C#/RS-485
TXD, RXD, IRTXD, DTRD#,
DSRD#, RTSD#, CTSD#,
CDD#, RID#, OP2D#,
OP1D#/RS-485
854 BLK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XR16C864 Datasheet Preview

XR16C864 Datasheet

2.97V TO 5.5V QUAD UART

No Preview Available !

XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
FIGURE 2. XR16C864 PIN OUT ASSIGNMENT IN 16 AND 68 MODE
TXRDYD#/TXDRQD 81
RXRDYD#/RXDRQD 82
CDD# 83
RID# 84
RXD 85
VCC 86
INTSEL 87
D0 88
D1 89
D2 90
D3 91
D4 92
D5 93
D6 94
D7 95
GND 96
RXA 97
RIA# 98
CDA# 99
RXRDYA#/RXDRQA 100
XR16C864
100-pin QFP
16 Mode
Connect 16/68# pin to VCC
áç
REV. 2.0.1
50 RXRDYC#/RXDRQC
49 CDC#
48 RIC#
47 RXC
46 GND
45 TXRDY#
44 RXRDY#
43 RESET
42 CHCCLK
41 XTAL2
40 XTAL1
39 A0
38 A1
37 A2
36 16/68#
35 CLKSEL
34 RXB
33 RIB#
32 CDB#
31 RXRDYB#/RXDRQB
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TXRDYD#/TXDRQD 81
RXRDYD#/RXDRQD 82
CDD# 83
RID# 84
RXD 85
VCC 86
GND 87
D0 88
D1 89
D2 90
D3 91
D4 92
D5 93
D6 94
D7 95
GND 96
RXA 97
RIA# 98
CDA# 99
RXRDYA#/RXDRQA 100
XR16C864
100-pin QFP
68 Mode
Connect 16/68# pin to GND
2
50 RXRDYC#/RXDRQC
49 CDC#
48 RIC#
47 RXC
46 GND
45 TXRDY#
44 RXRDY#
43 RESET#
42 CHCCLK
41 XTAL2
40 XTAL1
39 A0
38 A1
37 A2
36 16/68#
35 CLKSEL
34 RXB
33 RIB#
32 CDB#
31 RXRDYB#/RXDRQB


Part Number XR16C864
Description 2.97V TO 5.5V QUAD UART
Maker Exar Corporation
Total Page 30 Pages
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