XR16C2850CM48 EXAR [Exar Corporation], XR16C2850CM48 Datasheet
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XR16C2850CM48
Manufacturer Part Number
XR16C2850CM48
Description
3.3V AND 5V DUART WITH 128-BYTE FIFO
Manufacturer
EXAR [Exar Corporation]
Datasheet
1.XR16C2850CM48.pdf
(43 pages)
APRIL 2002
GENERAL DESCRIPTION
The XR16C2850
sal asynchronous receiver and transmitter (UART).
Enhanced features include 128 bytes of TX and RX
FIFOs, programmable TX and RX FIFO trigger level,
FIFO level counters, automatic (RTS/CTS) hardware
and (Xon/Xoff) software flow control, automatic RS-
485 half duplex direction control output and data rates
up to 6.25 Mbps at 5V and 8X sampling clock. On-
board status registers provide the user with opera-
tional status and data error flags. An internal loop-
back capability allows system diagnostics. The 2850
has a full modem interface and can operate at 3.3 V
or 5 V and is pin-to-pin compatible to Exar’s
ST16C2550 and XR16C2750 except the 48-TQFP
package. The 2850 register set is compatible to the
industry standard ST16C2550 and is available in 48-
pin TQFP , 44-pin PLCC and 40-pin PDIP packages.
The 40-pin package does not offer TXRDY# and
RXRDY# pins (DMA signal monitoring) otherwise the
three package versions are the same.
N
APPLICATIONS
• Portable Appliances
• Telecommunication Network Routers
• Ethernet Network Routers
• Cellular Data Devices
• Factory Automation and Process Controls
EXAR Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com • uarttechsupport@exar.com
F
OTE
IGURE
:
1 Covered by U.S. Patent #5,649,122 and #5,832,205
RXRDYA#
RXRDYB#
TXRDYA#
TXRDYB#
HDCNTL#
1. XR16C2850 B
CLK8/16
CLKSEL
D7:D0
A2:A0
CSA#
CSB#
Reset
IOW#
IOR#
INTA
INTB
1
(2850) is an enhanced dual univer-
LOCK
8-bit Data
Interface
Bus
D
IAGRAM
3.3V AND 5V DUART WITH 128-BYTE FIFO
UART
BRG
Regs
(same as Channel A)
Crystal Osc/Buffer
FEATURES
• Pin-to-pin compatible and functionally compatible to
• Pin-alike Exar’s XR16L2750 and ST16C2550 48-
• Two independent UART channels
• Device Identification and Revision
• Crystal oscillator or external clock input
• Industrial and commercial temperature ranges
• 48-TQFP and 44-PLCC packages
UART Channel B
UART Channel A
Exar’s ST16C2550 and XR16L2750 and TI’s
TL16C752B on the 44-PLCC package
TQFP package but with additional CLK8/16, CLK-
SEL and HDCNTL inputs
• Register set compatible to 16C550
• Up to 6.25 Mbps at 5V, and 4 Mbps at 3.3V
• Transmit and Receive FIFOs of 128 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
• Wireless Infrared (IrDA 1.0) Encoder/Decoder
• Automatic sleep mode
• Full modem interface
TX & RX
128 Byte TX FIFO
128 Byte RX FIFO
Output
ENDEC
IR
XR16C2850
3.3V or 5V VCC
GND
TXA, RXA, DTRA#,
DSRA#, RTSA#,
DTSA#, CDA#, RIA#,
OP2A#
TXB, RXB, DTRB#,
DSRB#, RTSB#,
CTSB#, CDB#, RIB#,
OP2B#
XTAL1
XTAL2
REV. 2.0.0