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XR16L2450IM Datasheet

  • XR16L2450IM

  • 2.25V TO 5.5V DUART

  • 30頁

  • EXAR   EXAR

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xr
OCTOBER 2004
XR16L2450
2.25V TO 5.5V DUART
REV. 1.1.0
GENERAL DESCRIPTION
The XR16L2450 (L2450) is a dual universal asyn-
chronous receiver and transmitter (UART). The
XR16L2450 is an improved version of the
ST16C2450 with lower operating voltage and 5 volt
tolerant inputs. The L2450 provides enhanced UART
functions, a modem control interface and data rates
up to 1.5 Mbps. Onboard status registers provide the
user with error indications and operational status. In-
dependent programmable baud rate generators are
provided to select transmit and receive clock rates up
to 1.5 Mbps. An internal loopback capability allows
onboard diagnostics. The L2450 is available in a 44-
pin PLCC and 48-pin TQFP packages. The L2450 is
fabricated in an advanced CMOS process capable of
operating from 2.25 volt to 5.5 volt power supply with
5 volt tolerant inputs.
APPLICATIONS
FEATURES
鈥?/div>
2.25 to 5.5 Volt Operation
鈥?/div>
5 Volt Tolerant Inputs
鈥?/div>
Pin-to-pin compatible to Exar鈥檚 ST16C2450,
ST16C2550,
XR16C2850
TQFP package
XR16L2550,
XR16L2750
and
鈥?/div>
Pin-to-pin compatible to TI鈥檚 TL16C752B on the 48-
鈥?/div>
2 independent UART channels
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈥?/div>
Portable Appliances
鈥?/div>
Telecommunication Network Routers
鈥?/div>
Ethernet Network Routers
鈥?/div>
Cellular Data Devices
鈥?/div>
Factory Automation and Process Controls
F
IGURE
1. XR16L2450 B
LOCK
D
IAGRAM
Up to 1.5 Mbps data rate with a 24 MHz crystal
oscillator or external clock frequency
1 byte Transmit FIFO
1 byte Receive FIFO with error tags
Status report registers
Modem control signals (CTS#, RTS#, DSR#,
DTR#, RI#, CD#)
Programmable character lengths (5, 6, 7, 8)
with even, odd, or no parity
鈥?/div>
Crystal oscillator or external clock input
鈥?/div>
TTL compatible inputs, outputs
鈥?/div>
Industrial temperature ranges
鈥?/div>
48-TQFP and 44-PLCC packages
*5V Tolerant inputs
2.25 to 5.5 Volt VCC
A2:A0
D7:D0
IOR#
IOW#
CSA#
CSB#
INTA
INTB
8-bit Data
Bus
Interface
UART Channel A
UART
Regs
THR
RHR
Modem I/Os
TXA
RXA
RTSA#, CTSA#,
DTRA#, DSRA#,
CDA#, RIA#, OP2A#
TXB
RXB
RTSB#, CTSB#,
DTRB#, DSRB#,
CDB#, RIB#, OP2B#
XTAL1
XTAL2
BRG
UART Channel B
(same as Channel A)
Reset
Crystal Osc/Buffer
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
鈥?/div>
www.exar.com

XR16L2450IM相關(guān)型號PDF文件下載

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    HIGH PERFORMANCE OCTAL UART
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    HIGH PERFORMANCE OCTAL UART
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