xr16l2552im Exar Corporation, xr16l2552im Datasheet

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xr16l2552im

Manufacturer Part Number
xr16l2552im
Description
Industry Smallest Package Uart With 2.25v To 5.5v Operation
Manufacturer
Exar Corporation
Datasheet

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Part Number:
xr16l2552im-F
Manufacturer:
Exar Corporation
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xr
MAY 2005
GENERAL DESCRIPTION
The XR16L2552 (L2552) is a dual universal
asynchronous receiver and transmitter (UART) with 5
volt tolerant inputs. The XR16L2552 is an improved
version of the ST16C2552 UART with lower operating
voltages and 5 volt tolerant inputs.
provides enhanced UART functions with 16 byte TX
and RX FIFOs, automatic hardware (RTS/CTS) and
software (Xon/Xoff) flow control, and a complete
modem control interface. Onboard status registers
provide
operational status.
baud rate generators are provided to select transmit
and receive clock rates up to 3.125Mbps. An internal
loop-back capability allows onboard diagnostics. The
L2552 provides block mode data transfers (DMA)
through FIFO controls. DMA transfer monitoring is
provided through the signals TXRDY# and RXRDY#.
An Alternate Function Register provides the user with
the ability to write the control registers for both UARTs
concurrently and selection of the Multi-Function
output (Baudout#, OP2#, or RXRDY#).
N
APPLICATIONS
Exar
F
OTE
IGURE
Portable Appliances
Telecommunication Network Routers
Ethernet Network Routers
Cellular Data Devices
Factory Automation and Process Controls
:
Corporation 48720 Kato Road, Fremont CA, 94538
1 Covered by U.S. Patent #5,649,122.
1. XR16L2552 B
the
BAUDOUTA#, or
RXRDY# A/B
TXRDY# A/B
BAUDOUTB#, or
(48-TQFP Only)
RXRDYA#)
RXRDYB#)
CHSEL
(OP2A#,
(OP2B#,
user
D7:D0
A2:A0
MFA#
MFB#
Reset
IOW#
IOR#
INTA
INTB
CS#
Indepedendent programmable
with
LOCK
error
8-bit Data
Interface
D
Bus
IAGRAM
indications
The L2552
and
(510) 668-7000
UART
BRG
Regs
* 5 Volt Tolerant Inputs
(same as Channel A)
Modem Control Logic
Crystal Osc/Buffer
UART Channel B
FEATURES
UART Channel A
2.25 to 5.5 Volt Operation
5 Volt Tolerant Inputs
Pin-to-pin and functionally compatible to National
PC16552
Pin-to-pin Compatible to Exar’s ST16C2552,
XR16L2752 and XR16C2852 in the 44-PLCC
2 Independent UART Channels
Concurrent write to Channels A and B
Crystal oscillator or external clock input
48-TQFP (7x7x1.0 mm) and 44-PLCC packages
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
16 Byte TX FIFO
16 Byte RX FIFO
TX & RX
Up to 3.125Mbps with external clock of 50 MHz
Register Set Compatible to 16C550
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 RX FIFO Trigger Levels
Automatic RTS/CTS hardware flow control
Automatic XonXoff software flow control
Wireless infrared encoder/decoder
Full Modem Interface (CTS#, RTS#, DSR#,
DTR#, RI#, CD#)
Programmable character lengths (5, 6, 7, 8)
with even, odd, or no parity
Multi-Function output allows more package
functions with fewer I/O pins
FAX (510) 668-7017
2.25 to 5.5 Volt VCC
GND
TXA
RXA
TXB
RXB
XTAL1
XTAL2
CTS#A/B, RI#A/B,
CD#A/B, DSR#A/B
DTR#A/B, RTS#A/B
www.exar.com
2552BLK
REV. 1.1.1

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