
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
(510) 668-7000 FAX (510) 668-7017
ST16C580
Rev. 1.22
UART WITH 16-BYTE FIFO’s AND
INFRARED (IrDA) ENCODER/DECODER
GENERAL DESCRIPTION
The ST16C5801 is a universal asynchronous receiver and transmitter (UART) and is pin compatible with the ST16C550
UART. The 580 is an enhanced UART with 16 byte FIFO’s, automatic hardware/software flow control, and data rates
up to 1.5Mbps. Onboard status registers provide the user with error indications and operational status. Modem
interface control is included and can be optionally configured to operate with the Infrared (IrDA) encoder/decoder. The
system interrupts may be tailored to meet user requirements. An internal loop-back capability allows onboard
diagnostics. The 580 is available in the 48 pin TQFP package. It is fabricated in an advanced CMOS process to achieve
low drain power and high speed requirements.
FEATURES
PintopinandfunctionallycompatibletotheIndustry
Standard 16550
2.97 to 5.5 volt operation
1.5 Mbps transmit/receive operation (24MHz)
16 byte transmit FIFO
16 byte receive FIFO with error flags
Automatichardware/softwareflowcontrol
ProgrammableXon/Xoffcharacters
Independent transmit and receive control
Software selectable Baud Rate Generator pre-
scaleable clock rates of 1X or 4X
Fourselectabletransmit/receiveFIFOinterrupttrig-
ger levels
StandardmodeminterfaceorInfraredIrDAencode/
decoder interface
Sleep mode ( 200A stand-by )
Low operating current ( 1.2mA typ.)
ORDERING INFORMATION
Part number
Package
Operating temp
Device Status
ST16C580CQ48
48-Lead TQFP
0° C to + 70° C
Active
ST16C580IQ48
48-Lead TQFP
-40° C to + 85° C
Active
*Note 1 Covered by U.S. Patent #5,649,122.
August 2005
48 Pin TQFP Package
48
47
46
45
44
43
42
41
40
39
38
37
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
13
14
15
16
17
18
19
20
21
22
23
24
N.C.
D5
D6
D7
RCLK
N.C.
RX
TX
CS0
CS1
-CS2
-BAUDOUT
N.
C
.
XT
AL
1
XT
AL
2
-I
O
W
IO
W
GN
D
-I
O
R
IO
R
N.
C
.
-D
D
IS
-T
XR
D
Y
-A
S
N.C.
RESET
-OP1
-DTR
-RTS
-OP2
INT
-RXRDY
A0
A1
A2
N.C.
N.
C
.
D4
D3
D2
D1
D0
VC
C
-R
I
-C
D
-D
SR
-C
T
S
N.
C
.
XR16C580CQ48