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XR16L2752CJ Datasheet

  • XR16L2752CJ

  • 2.25V TO 5.5V DUART WITH 64-BYTE FIFO

  • 49頁

  • EXAR   EXAR

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xr
AUGUST 2004
XR16L2752
2.25V TO 5.5V DUART WITH 64-BYTE FIFO
REV. 1.2.0
GENERAL DESCRIPTION
The XR16L2752
1
(2752) is a low voltage dual
universal asynchronous receiver and transmitter
(UART) with 5 Volt tolerant inputs. The device
operates from 2.25 to 5.5 Volt supply range and is
pin-to-pin compatible to Exar鈥檚 ST16C2552 and
XR16C2852. The 2752 register set is compatible to
the ST16C2552 and the XR16C2852 enhanced
features. It supports the Exar鈥檚 enhanced features of
64 bytes of TX and RX FIFOs, programmable FIFO
trigger level and FIFO level counters, automatic
hardware (RTS/CTS) and software flow control,
automatic RS-485 half duplex direction control output
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 6.25 Mbps at 5 Volt and 8X
sampling. The 2752 is available in the 44-pin PLCC
package.
N
OTE
:
1 Covered by U.S. Patent #5,649,122 and #5,949,787
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 ST16C2552 and
XR16C2852
鈥?/div>
Larger FIFO version of PC16C552
鈥?/div>
Two independent UART channels
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
APPLICATIONS
Reg set compatible to 16C2552 and 16C2852
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
Transmit and Receive FIFOs of 64 bytes
Programmable TX and RX FIFO Trigger Levels
Transmit and Receive FIFO Level Counters
Automatic Hardware (RTS/CTS) Flow Control
Selectable Auto RTS Flow Control Hysteresis
Automatic Software (Xon/Xoff) Flow Control
Automatic RS-485 Half-duplex Direction
Control Output via RTS#
Wireless Infrared (IrDA 1.0) Encoder/Decoder
Automatic sleep mode
Full modem interface
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. XR16L2752 B
LOCK
D
IAGRAM
鈥?/div>
Alternate Function Register
鈥?/div>
Device Identification and Revision
鈥?/div>
Crystal oscillator or external clock input
鈥?/div>
Industrial and commercial temperature ranges
鈥?/div>
44-PLCC package
A2:A0
D7:D0
IOR#
IOW#
CS#
CHSEL
INTA
INTB
TXRDYA#
TXRDYB#
MFA#
(OP2A#,
BAUDOUTA#, or
RXRDYA#)
*5 Volt Tolerant Inputs
(Except External Clock Input)
UART Channel A
UART
Regs
BRG
8-bit Data
Bus
Interface
64 Byte TX FIFO
TX & RX
IR
ENDEC
2.25 V to 5.5 V VCC
GND
TXA (or TXIRA)
64 Byte RX FIFO
RXA (or RXIRA)
TXB (or TXIRB)
RXB (or RXIRB)
UART Channel B
(same as Channel A)
MFB#
(OP2B#,
BAUDOUTB#, or
RXRDYB#)
Crystal Osc/Buffer
Modem Control Logic
XTAL1
XTAL2
CTS#A/B, RI#A/B,
CD#A/B, DSR#A/B
DTR#A/B, RTS#A/B
2752BLK
Reset
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
鈥?/div>
www.exar.com

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