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XR16L2751 fiches techniques PDF

Exar Corporation - 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE

Numéro de référence XR16L2751
Description 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
Fabricant Exar Corporation 
Logo Exar Corporation 





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XR16L2751
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
SEPTEMBER 2002
REV. 1.0.0
GENERAL DESCRIPTION
The XR16L27511 (2751) is a low voltage dual
universal asynchronous receiver and transmitter
(UART) with 5 Volt tolerant inputs. The device
includes 2 additional capabilities over the
XR16L2750: Intel and Motorola data bus selection
and a “PowerSave” mode to further reduce sleep
current to a minimum during sleep mode. The 2751’s
register set is compatible to the ST16C2550 and
XR16C2850 but with added functions. It supports the
Exar’s enhanced features of 64 bytes of TX and RX
FIFOs, programmable FIFO trigger level, FIFO level
counters, automatic hardware and software flow
control, automatic RS-485 half duplex direction
control with programmable turn-around delay, and a
complete modem interface. Onboard registers
provide the user with operational status and data
error tags. An internal loopback capability allows
onboard diagnostics. Independent programmable
baud rate generator is provided in each UART
channel to support data rates up to 6.25 Mbps.
NOTE: 1 Covered by U.S. Patent #5,649,122 and #5,832,205
APPLICATIONS
Portable and Battery Operated Appliances
Wireless Access Servers
Ethernet Network Routers
Cellular Data Devices
Telecommunication Network Routers
Factory Automation and Process Controls
FIGURE 1. XR16L2751 BLOCK DIAGRAM
FEATURES
2.25 to 5.5 Volt Operation
5 Volt Tolerant Inputs
Functionally Compatible to ST16C2550
XR16C2850 with 4 additional inputs
Intel or Motorola Data Bus Interface Select
Two Independent UARTs
and
s Up to 6.25 Mbps at 5 Volt, 4 Mbps at 3.3 Volt,
and 3 Mbps at 2.5 Volt with 8X sampling rate
s 64 bytes of Transmit and Receive FIFOs
s Transmit and Receive FIFO Level Counters
s Programmable TX and RX FIFO Trigger Levels
s Automatic Hardware (RTS/CTS) Flow Control
s Selectable RTS Flow Control Hysteresis.
s Automatic Software (Xoff/Xon) Flow Control
s Automatic RS-485 2-wire Half-duplex Direction
Control to the Transceiver via RTS#
s Full Modem Interface
s Infrared Receive and Transmit Encoder/
decoder
PowerSave Feature reduces sleep current to 15 µA
at 3.3 Volt
Device Identification
Crystal or external clock input
Industrial and Commercial Temperature ranges
48 TQFP Package (7 x 7 x 1.0 mm)
PwrSave
A2:A0
D7:D0
IOR# (VCC)
IOW# (R/W#)
CSA# (CS#)
CSB# (A3)
INTA (IRQ#)
INTB (logic 0)
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
Reset (Reset#)
16/68#
CLKSEL
HDCNTL#
Intel or
Motorola
Data Bus
Interface
*5 Volt Tolerant Inputs
UART Channel A
UART
Regs
BRG
64 Byte TX FIFO
TX & RX
IR
ENDEC
64 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
2.25 to 5.5 Volt VCC
GND
TXA, RXA, DTRA#,
DSRA#, RTSA#,
DTSA#, CDA#, RIA#,
OP2A#
TXB, RXB, DTRB#,
DSRB#, RTSB#,
CTSB#, CDB#, RIB#,
OP2B#
XTAL1
XTAL2
2751BLK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

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