ST16C550_05 Datasheet, PDF (1/35 Pages) Exar Corporation – UART WITH 16-BYTE FIFO’s

ST16C550
UART WITH 16-BYTE FIFO’s
GENERAL DESCRIPTION
The ST16C550 (550) is a universal asynchronous re-
ceiver and transmitter with 16 byte transmit and receive
FIFO. It operates at 2.97 to 5.5 volts. A programmable
baud rate generator can select transmit and receive
clock rates from 50 bps to 1.5 Mbps.
The ST16C550 is an improved version of the NS16C550
UART with higher operating speed and lower access
time. The ST16C550 on board status registers provides
the error conditions, type and status of the transfer
operation being performed. Included is complete MO-
DEM control capability, and a processor interrupt
system that may be software tailored to the user’s
requirements. The ST16C550 provides internal loop-
back capability for on board diagnostic testing.
The ST16C550 is available in 40 pin PDIP, 44 pin PLCC,
and 48 pin TQFP packages. It is fabricated in an
advanced CMOS process to achieve low drain power
and high speed requirements.
April 2005
PLCC Package
D5 7
D6 8
D7 9
RCLK 10
RX 11
N.C. 12
TX 13
CS0 14
CS1 15
-CS2 16
-BAUDOUT 17
ST16C550CJ44
39 RESET
38 -OP1
37 -DTR
36 -RTS
35 -OP2
34 N.C.
33 INT
32 -RXRDY
31 A0
30 A1
29 A2
FEATURES
• Pin to pin and functionally compatible to the Industry
Standard 16C550
• 2.97 to 5.5 volt operation
• 24MHz clock operation at 5V
• 16MHz clock operation at 3.3V
• 16 byte transmit FIFO
• 16 byte receive FIFO with error flags
• Full duplex operation
• Transmit and receive control
• Four selectable receive FIFO interrupt trigger levels
• Standard modem interface
• Compatible with ST16C450
• Low operating current ( 1.2mA typ.)
ORDERING INFORMATION
Part number
ST16C550CP40
ST16C550CJ44
ST16C550CQ48
ST16C550IP40
ST16C550IJ44
ST16C550IQ48
Package
40-Lead PDIP
44-Lead PLCC
48-Lead TQFP
40-Lead PDIP
44-Lead PLCC
48-Lead TQFP
Operating temperature
0° C to + 70° C
0° C to + 70° C
0° C to + 70° C
-40° C to + 85° C
-40° C to + 85° C
-40° C to + 85° C
Device Status
Active. See the ST16C550CQ48 for new designs.
Active
Active
Active. See the ST16C550IQ48 for new designs.
Active
Active
Rev. 5.01
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone]