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Exar Corporation
Exar Corporation

XR16M752 Datasheet Preview

XR16M752 Datasheet

HIGH PERFORMANCE DUART

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XR16M752 pdf
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XR16M752/XR68M752
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
MAY 2007
REV. 1.0.2
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 3.3
Volt 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 and 32-pin QFN 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 and 32-QFN 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 (510) 668-7000 FAX (510) 668-7017 www.exar.com



Exar Corporation
Exar Corporation

XR16M752 Datasheet Preview

XR16M752 Datasheet

HIGH PERFORMANCE DUART

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XR16M752 pdf
www.DXaRta1S6hMee7t54U2./cXoRm68M752
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
FIGURE 2. PIN OUT ASSIGNMENT
REV. 1.0.2
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CSA# 10
CSB# 11
NC 12
XR16M752
48-pin TQFP
Intel Mode Only
36 RESET
35 DTRB#
34 DTRA#
33 RTSA#
32 OP2A#
31 RXRDYA#
30 INTA
29 INTB
28 A0
27 A1
26 A2
25 NC
D6
D7
RXB
RXA
TXA
TXB
CSA#
CSB#
1
2
3
4
5
6
7
8
XR16M752
32-pin QFN
Intel Mode Only
24 RESET
23 RTSA#
22 INTA
21 INTB
20 A0
19 A1
18 A2
17 NC
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CSA# 10
CSB# 11
NC 12
XR68M 752
48- pin TQFP
Intel Mode
36 RESET
35 DTRB#
34 DTRA#
33 RTSA#
32 OP2A#
31 RXRDYA #
30 INTA
29 INTB
28 A0
27 A1
26 A2
25 N C
VCC
D6
D7
RXB
RXA
TXA
TXB
CSA#
CSB#
1
2
3
4
5
6
7
8
XR68M752
32-pin QFN
Intel Mode
24 RESET
23 RTSA#
22 INTA
21 INTB
20 A0
19 A1
18 A2
17 16/68#
VCC
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CS# 10
A3 11
NC 12
XR68M 752
48- pin TQFP
Motorola Mode
36 RESET#
35 DTRB#
34 DTRA#
33 RTSA#
32 OP2A#
31 RXRDYA#
30 IRQ#
29 NC
28 A0
27 A1
26 A2
25 N C
GND
2
D6
D7
RXB
RXA
TXA
TXB
CS#
A3
1
2
3
4
5
6
7
8
XR68M752
32-pin QFN
Motorola Mode
24 RESET#
23 RTSA#
22 IRQ#
21 NC
20 A0
19 A1
18 A2
17 16/68#
GND


Part Number XR16M752
Description HIGH PERFORMANCE DUART
Maker Exar Corporation
Total Page 30 Pages
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