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부품번호 XR16M2752 기능
기능 HIGH PERFORMANCE DUART
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XR16M2752 데이터시트, 핀배열, 회로
www.DataSheet4U.com
XR16M2752
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
JUNE 2007
REV. P1.0.0
GENERAL DESCRIPTION
The XR16M27521 (M2752) is a high performance
dual universal asynchronous receiver and transmitter
(UART) with 64 byte TX and RX FIFOs. The device
operates from 1.62 to 3.6 volts and is pin-to-pin
compatible to Exar’s ST16C2552, XR16L2552,
XR16L2752 and XR16V2752. The M2752 register set
is identical to the XR16V2752 and is compatible to
the ST16C2552 and the XR16C2852 enhanced
features. It supports the Exar’s enhanced features of
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 8
Mbps at 3.3 Volt and 8X sampling clock. The M2752
is available in 44-pin PLCC 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 compatible to Exar’s XR16L2752
Two independent UART channels
Register set compatible to XR16L2752
Data rate of up to 8 Mbps at 3.3 V, 6.25 Mbps
at 2.5 V and 4 Mbps at 1.8 V with 8X sampling
rate
Fractional Baud Rate Generator
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
Alternate Function Register
Device Identification and Revision
Crystal oscillator or external clock input
Crystal oscillator (up to 32MHz) or external clock
(up to 64MHz) input
44-PLCC and 32-QFN packages
FIGURE 1. XR16M2752 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CS#
CHSEL
INTA
INTB
TXRDYA#
TXRDYB#
MFA#
(OP2A#,
BAUDOUTA#, or
RXRDYA#)
MFB#
(OP2B#,
BAUDOUTB#, or
RXRDYB#)
Reset
8-bit Data
Bus
Interface
UART Channel A
UART
Regs
BRG
64 Byte TX FIFO
TX & RX IR
ENDEC
64 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
Modem Control Logic
1.62 V to 3.6 V VCC
GND
TXA (or TXIRA)
RXA (or RXIRA)
TXB (or TXIRB)
RXB (or RXIRB)
XTAL1
XTAL2
CTS#A/B, RI#A/B,
CD#A/B, DSR#A/B
DTR#A/B, RTS#A/B
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




XR16M2752 pdf, 반도체, 판매, 대치품
www.DXaRta1S6hMee2t47U5.2com
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
Pin Description
REV. P1.0.0
NAME
RXA
RTSA#
CTSA#
DTRA#
DSRA#
CDA#
RIA#
MFA#
32-QFN
PIN #
24
22
25
-
-
-
-
-
44-PLCC
PIN #
39
36
40
37
41
42
43
35
TYPE
DESCRIPTION
I UART channel A Receive Data or infrared receive data. Normal receive
data input must idle HIGH. The infrared receiver pulses typically idles
LOW but can be inverted by software control prior going in to the decoder,
see MCR[6] and FCTR[2]. If this pin is not used, tie it to VCC or pull it high
via a 100k ohm resistor.
O UART channel A Request-to-Send (active low) or general purpose output.
This output must be asserted prior to using auto RTS flow control, see
EFR[6], MCR[1], FCTR[1:0], EMSR[5:4] and IER[6]. For auto RS485 half-
duplex direction control, see FCTR[3] and EMSR[3].
I UART channel A Clear-to-Send (active low) or general purpose input. It
can be used for auto CTS flow control, see EFR[7], and IER[7]. This input
should be connected to VCC when not used.
O UART channel A Data-Terminal-Ready (active low) or general purpose
output. If this pin is not used, leave it unconnected.
I UART channel A Data-Set-Ready (active low) or general purpose input.
This input should be connected to VCC when not used. This input has no
effect on the UART.
I UART channel A Carrier-Detect (active low) or general purpose input. This
input should be connected to VCC when not used. This input has no effect
on the UART.
I UART channel A Ring-Indicator (active low) or general purpose input. This
input should be connected to VCC when not used. This input has no effect
on the UART.
O Multi-Function Output Channel A. This output pin can function as the
OP2A#, BAUDOUTA#, or RXRDYA# pin. One of these output signal func-
tions can be selected by the user programmable bits 1-2 of the Alternate
Function Register (AFR). These signal functions are described as follows:
TXB 16
RXB
15
1) OP2A# - When OP2A# (active low) is selected, the MF# pin is LOW
when MCR bit-3 is set to a logic 1 (see MCR bit-3). MCR bit-3 defaults to a
logic 0 condition after a reset or power-up.
2) BAUDOUTA# - When BAUDOUTA# function is selected, the 16X Baud
rate clock output is available at this pin.
3) RXRDYA# - RXRDYA# (active low) is intended for monitoring DMA data
transfers. See Table 2 for more details.
26 O UART channel B Transmit Data or infrared encoder data. Standard trans-
mit and receive interface is enabled when MCR[6] = 0. In this mode, the
TX signal will be HIGH during reset or idle (no data). Infrared IrDA transmit
and receive interface is enabled when MCR[6] = 1. In the Infrared mode,
the inactive state (no data) for the Infrared encoder/decoder interface is
LOW. If it is not used, leave it unconnected.
25 I UART channel B Receive Data or infrared receive data. Normal receive
data input must idle HIGH. The infrared receiver pulses typically idles
LOW but can be inverted by software control prior going in to the decoder,
see MCR[6] and FCTR[2]. If this pin is not used, tie it to VCC or pull it high
via a 100k ohm resistor.
4

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XR16M2752 전자부품, 판매, 대치품
www.DataSheet4U.com
XR16M2752
REV. P1.0.0
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
2.0 FUNCTIONAL DESCRIPTIONS
2.1 CPU Interface
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The M2752 data interface supports the Intel compatible types of CPUs and it is compatible
to the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data
bus transaction. Each bus cycle is asynchronous using CS#, IOR# and IOW# signals. Both UART channels
share the same data bus for host operations. The data bus interconnections are shown in Figure 3
FIGURE 3. XR16L2750 DATA BUS INTERCONNECTIONS
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
IO R #
IO W #
UART_CS#
UART_CHSEL
U AR T_IN TA
U AR T_IN TB
TXRDYA#
(R X R D Y A # )
TXRDYB#
(R X R D Y B # )
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
IO R #
IO W #
VCC
TXA
RXA
DTRA#
UART
Channel A
RTSA#
CTSA#
DSRA#
CDA#
R IA#
(O P2A#)
(BAUDO UTA#)
CS#
CHSEL
IN TA
IN TB
UART
Channel B
TXB
RXB
DTRB#
RTSB#
CTSB#
TXRDYA#
(R X R D Y A # )
TXRDYB#
(R X R D Y B # )
DSRB#
CDB#
R IB#
(O P2B#)
(BAUDO UTB#)
VCC
Serial Interface of
RS-232, RS-485
Serial Interface of
RS-232, RS-485
UART_RESET
RESET
GND
2 7 5 0 in t
P ins in parentheses becom e available through the M F # pin. M F # A /B becom es R X R D Y # A /B when AF R [2:1] = '10'. M F # A/B becom es O P 2# A /B
when A F R [2:1] = '00'. M F # A /B becom es B A U D O U T # A /B when AF R [1:0] = '01'.
2.2 Device Reset
The RESET input resets the internal registers and the serial interface outputs in both channels to their default
state (see Table 16). An active high pulse of longer than 40 ns duration will be required to activate the reset
function in the device.
2.3 Device Identification and Revision
The XR16M2752 provides a Device Identification code and a Device Revision code to distinguish the part from
other devices and revisions. To read the identification code from the part, it is required to set the baud rate
generator registers DLL and DLM both to 0x00 (DLD = 0xXX). Now reading the content of the DLM will provide
0x0A for the XR16M2752 and reading the content of DLL will provide the revision of the part; for example, a
reading of 0x01 means revision A.
2.4 Channel A and B Selection
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. A logic 0 on chip select pin (CS#) allows the user to select
the UART and then using the channel select (CHSEL) pin, the user can select channel A or B to configure,
send transmit data and/or unload receive data to/from the UART. Individual channel select functions are shown
in Table 1.
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