XR16M752_09 Datasheet, PDF (1/54 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 64-BYTE FIFO

XR16M752/XR68M752
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
JUNE 2009
REV. 1.1.1
GENERAL DESCRIPTION
The XR16M752/XR68M752¹ (M752) is a high
performance dual universal asynchronous receiver
and transmitter (UART) with 64 byte TX and RX
FIFOs. The M752 operates from 1.62 to 3.63 volts. It
is pin-to-pin and software compatible to the
TL16C752B and SC16C752B, but with additional
features such as a programmable fractional baud rate
generator, automatic RS-485 half-duplex direction
control, infrared mode and 8X and 4X sampling rate.
The standard features include 16 selectable TX and
RX FIFO trigger levels, 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. Each channel is independently
programmable for data rates up to 16 Mbps at 3.3V
with a 4X sampling rate. The XR68M752 has an
additional 16/68# pin to select between the Intel and
Motorola bus interface. The M752 is available in the
48-pin TQFP, 32-pin QFN and 49-pin STBGA
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
• 1.62 to 3.6 Volt Operation
• Pin-to-pin and software compatible to TI’s
TL16C752B and Philips’ SC16C752B in the 48-
TQFP package
• Two independent UART channels
■ Data rate of up to 16 Mbps at 3.3 V
■ Data rate of up to 12.5 Mbps at 2.5 V
■ Data rate of up to 8 Mbps at 1.8 V
■ Fractional Baud Rate Generator
■ Data sampling rates of 16X, 8X and 4X
■ Transmit and Receive FIFOs of 64 bytes
■ Programmable TX and RX FIFO Trigger Levels
■ Automatic Hardware (RTS/CTS) Flow Control
■ Automatic Software (Xon/Xoff) Flow Control
■ Halt and Resume Transmission Control
■ Automatic RS-485 Half-duplex Direction
Control Output via RTS#
■ Wireless Infrared (IrDA 1.0) Encoder/Decoder
■ Automatic sleep mode
■ Full modem interface
• Crystal oscillator (up to 24MHz) or external clock
(up to 64MHz) input
• 48-TQFP, 32-QFN and 49-STBGA packages
FIGURE 1. XR16M752 BLOCK DIAGRAM
A2:A0
D7:D0
IOR# (NC)
IOW# (R/W#)
CSA# (CS#)
CSB# (A3)
INTA (IRQ#)
INTB (NC)
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
Reset/Reset#
16/68#
8-bit Data
Bus
Interface
UART Channel A
UART ^{64 Byte TX FIFO}
Regs
TX & RX
IR
ENDEC
BRG
64 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
1.62 to 3.63 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 • [phone] • FAX [phone] • www.exar.com