XR16C854 Datasheet, PDF (1/51 Pages) Exar Corporation – QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO

Preliminary
Information
XR16C854
QUAD UART WITH RX/TX FIFO
COUNTERS,128-BYTE FIFO
DESCRIPTION
The XR16C854 *¹ (854) is a universal asynchronous receiver and transmitter (UART) with a dual foot print
interface compatible with the ST16C554D/654 and ST68C554/654. The 854 is an enhanced UART with 128 byte
FIFO’s, Independent Transmit and Receive FIFO counter, automatic hardware/software flow control, and data
rates up to 1.5Mbps. Onboard status registers provide the user with error indications and operational status,
modem interface control. System interrupts may be tailored to meet user requirements. An internal loop-back
capability allows onboard diagnostics. The 854 is available in 64 pin TQFP, 68 pin PLCC, and 100 pin QFP
packages. The 64 pin package offers the 16 interface mode which is compatible with the industry standard
ST16C554. The 68 and 100 pin packages offer an additional 68 mode which allows easy integration with Motorola,
and other popular microprocessors. The XR16C854CV (64 pin) offers three state interrupt control while the
XR16C854DV provides constant active interrupt outputs. The 64 pin devices do not offer TXRDY/RXRDY outputs
or the default clock select option (CLKSEL). The 100 pin packages offer faster channel status access by providing
separate outputs for TXRDY and RXRDY, offer separate Infrared TX outputs and a musical instrument clock input
(MIDICLK). The 854 combines the package interface modes of the 16C554/654 and 68C554/654 series on a
single integrated chip.
FEATURES
• Compatibility with the Industry Standard
ST16C554/654, ST68C554/654, TL16C554
• 1.5 Mbps transmit/receive operation (24MHz)
• 128 byte transmit and receive FIFO
• Independent transmit and receive FIFO counter
• Automatic software/hardware flow control
• Programmable Xon/Xoff characters
• Software selectable Baud Rate Generator pre-
scaleable clock rates of 1X, 4X.
• Four selectable, and Programmable Transmit/
Receive FIFO interrupt trigger levels
• Standard modem interface or infrared IrDA en-
coder/decoder interface
• Software flow control turned off optionally by any
(Xon) RX character
• Independent MIDI interface on 100 pin packages
• 100 pin packages offer internal register FIFO
monitoring and separate IrDA TX outputs
• Sleep mode ( 200µA stand-by)
-DSRA 10
-CTSA 11
-DTRA 12
VCC 13
-RTSA 14
INTA 15
-CSA 16
TXA 17
-IOW 18
TXB 19
-CSB 20
INTB 21
-RTSB 22
GND 23
-DTRB 24
-CTSB 25
-DSRB 26
PLCC Package
XR16C854CJ
16 MODE
60 -DSRD
59 -CTSD
58 -DTRD
57 GND
56 -RTSD
55 INTD
54 -CSD
53 TXD
52 -IOR
51 TXC
50 -CSC
49 INTC
48 -RTSC
47 VCC
46 -DTRC
45 -CTSC
44 -DSRC
ORDERING INFORMATION
Part number
XR16C854CJ
XR16C854CV
XR16C854DCV
XR16C854CQ
Pins Package Operating temperature
68 PLCC
0° C to + 70° C
64 TQFP
0° C to + 70° C
64 TQFP
0° C to + 70° C
100 QFP
0° C to + 70° C
Part number
Pins
XR16C854IJ
68
XR16C854IV
64
XR16C854DIV
64
XR16C854IQ
100
Note *1: Patent Pending
Package Operating temperature
PLCC
-40° C to + 85° C
TQFP
-40° C to + 85° C
TQFP
-40° C to + 85° C
QFP
-40° C to + 85° C
Rev. 1.00P
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone]