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Exar Corporation - HIGH PERFORMANCE DUART

Numéro de référence XR16V2552
Description HIGH PERFORMANCE DUART
Fabricant Exar Corporation 
Logo Exar Corporation 





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XR16V2552 fiche technique
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PRELIMINARY
XR16V2552
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
JUNE 2006
REV. P1.0.0
GENERAL DESCRIPTION
The XR16V25521 (V2552) is a high performance dual
universal asynchronous receiver and transmitter
(UART) with 16 byte TX and RX FIFOs. The device
operates from 2.25 to 3.6 volts with 5 Volt tolerant
inputs and is pin-to-pin compatible to Exar’s
ST16C2552 and XR16L2552. The V2552 register set
is compatible to the ST16C2552 and the XR16L2552.
It supports the Exar’s enhanced features of
selectable FIFO trigger level, automatic hardware
(RTS/CTS) and software (Xon/Xoff) flow control, and
a complete modem interface. Onboard registers
provide the user with operational status and data
error flags. An internal loopback capability allows
system diagnostics. Independent programmable
baud rate generators are provided in each channel to
select data rates up to 16 Mbps at 3.3 Volt with 4X
sampling clock. The V2552 is available in 44-pin
PLCC and 32-pin QFN packages.
NOTE: 1 Covered by U.S. Patent #5,649,122
APPLICATIONS
Portable Appliances
Telecommunication Network Routers
Ethernet Network Routers
Cellular Data Devices
Factory Automation and Process Controls
FEATURES
2.25 to 3.6 Volt Operation
5 Volt Tolerant Inputs
Pin-to-pin compatible to Exar’s XR16L2552 in the
44-PLCC package
Two independent UART channels
Register set identical to 16V2550
Data rate of up to 16 Mbps at 3.3 V, and
12.5 Mbps at 2.5 V with 4X sampling rate
Fractional Baud Rate Generator
Transmit and Receive FIFOs of 16 bytes
Selectable TX and RX FIFO Trigger Levels
Automatic Hardware (RTS/CTS) Flow Control
Automatic Software (Xon/Xoff) Flow Control
Wireless Infrared (IrDA 1.0) Encoder/Decoder
Automatic sleep mode
Full modem interface
Alternate Function Register
Device Identification and Revision
Crystal oscillator (up to 32MHz) or external clock
(up to 64MHz) input
44-PLCC and 32-QFN packages
FIGURE 1. XR16V2552 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CS#
CHSEL
INTA
INTB
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
Reset
8-bit Data
Bus
Interface
* 5 Volt Tolerant Inputs
UART Channel A
UART
Regs
BRG
16 Byte TX FIFO
TX & RX
IR
ENDEC
16 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
2.25 to 3.6 Volt VCC
GND
TXA, RXA, DTRA#,
DSRA#, RTSA#,
DTSA#, CDA#, RIA#,
OP2A#
TXB, RXB, DTRB#,
DSRB#, RTSB#,
CTSB#, CDB#, RIB#,
OP2B#
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

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