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XR16C2550 fiches techniques PDF

Exar Corporation - 2.97V TO 5.5V DUART

Numéro de référence XR16C2550
Description 2.97V TO 5.5V DUART
Fabricant Exar Corporation 
Logo Exar Corporation 





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XR16C2550 fiche technique
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JANUARY 2005
GENERAL DESCRIPTION
The XR16C2550 (2550) is a dual universal
asynchronous receiver and transmitter (UART). The
XR16C2550 is an improved version of the PC16550
UART with higher operating speed and faster access
times. The 2550 provides enhanced UART functions
with 16 byte FIFO’s, a modem control interface, and
data rates up to 4 Mbps. Onboard status registers
provide the user with error indications and
operational status. System interrupts and modem
control features may be tailored by external software
to meet specific user requirements. Independent
programmable baud rate generators are provided to
select transmit and receive clock rates from 50 bps to
4 Mbps. The Baud Rate Generator can be configured
for either crystal or external clock input. An internal
loopback capability allows onboard diagnostics. The
2550 is available in a 44-pin PLCC and 48-pin TQFP
packages. The 2550 is fabricated in an advanced
CMOS process capable of operating from 2.97 volt to
5.5 volt power supply.
APPLICATIONS
Portable Appliances
Telecommunication Network Routers
Ethernet Network Routers
Cellular Data Devices
Factory Automation and Process Controls
XR16C2550
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
FEATURES
REV. 1.0.1
2.97 Volt to 5.5 Volt Operation
5 Volt Tolerant Inputs
Pin-to-pin compatible to Exar’s ST16C2450,
XR16L2550 and XR16L2750
Pin-to-pin compatible to TI’s TL16C752B on the 48-
TQFP package
Pin alike XR16C2850 48-TQFP package but
without CLK8/16, CLKSEL and HDCNTL inputs
2 independent UART channels
Up to 4 Mbps with external clock of 64 MHz
Up to 1.5 Mbps data rate with a 24 MHz crystal
frequency
16 byte Transmit FIFO to reduce the bandwidth
requirement of the external CPU
16 byte Receive FIFO with error tags to reduce
the bandwidth requirement of the external CPU
4 selectable Receive FIFO interrupt trigger
levels
Modem control signals (CTS#, RTS#, DSR#,
DTR#, RI#, CD#)
Programmable character lengths (5, 6, 7, 8)
with even, odd, or no parity
Crystal oscillator or external clock input
48-TQFP and 44-PLCC packages
FIGURE 1. XR16C2550 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CSA#
CSB#
INTA
INTB
TXRDYA#
TXRDYB#
RXRDYA#
RDRXYB#
Reset
8- bit Data
Bus
Interface
*All inputs are 5V tolerant
UART Channel A
UART
Regs
BRG
16 Byte TX FIFO
TX & RX
16 Byte RX FIFO
UART Channel B
( same as Channel A )
Crystal Osc / Buffer
2.97 V to5.5V
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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