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PDF 16C450 Data sheet ( Hoja de datos )
| Número de pieza | 16C450 | |
| Descripción | ST16C450 | |
| Fabricantes | Exar Corporation | |
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GENERAL DESCRIPTION
The ST16C450 is a universal asynchronous receiver
and transmitter. The ST16C450 is an improved ver-
sion of the NS16450 UART with higher operating
speed and lower access time. A programmable baud
rate generator is provided to select transmit and
www.DataSheet4U.croemceive clock rates from 50 Bps to 1.5 Mbps.
The ST16C450 on board status registers provides the
error conditions, type and status of the transfer
operation being performed. Included is complete
MODEM control capability, and a processor interrupt
system that may be software tailored to the user’s
requirements. The ST16C450 provides internal loop-
back capability for on board diagnostic testing.
The ST16C450 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.
ST16C450
UNIVERSAL ASYNCHRONOUS
RECEIVER/TRANSMITTER (UART)
September 2003
PLCC Package
D5
D6
D7
RCLK
RX
N.C.
TX
CS0
CS1
-CS2
-BAUDOUT
7
8
9
10
11
12
13
14
15
16
17
ST16C450CJ44
39 RESET
38 -OP1
37 -DTR
36 -RTS
35 -OP2
34 N.C.
33 INT
32 N.C.
31 A0
30 A1
29 A2
FEATURES
• Pin to pin and functionally compatible to the Indus-
try Standard 16450
• 2.97 to 5.5 volt operation
• 1.5 Mbps transmit/receive operation (24MHz)
• Programmable word lengths (5, 6, 7, 8)
• Even, odd, force, or no parity generation and
detection
• Independent transmit and receive control
• Standard modem interface
• Low operating current ( 1.2mA typ.)
ORDERING INFORMATION
Part number
ST16C450CP40
ST16C450CJ44
ST16C450CQ48
ST16C450IP40
ST16C450IJ44
ST16C450IQ48
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 ST16C450CQ48 for new designs.
Active
Active
Active. See the ST16C450IQ48 for new designs.
Active
Active
Rev. 4.20
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017
1 page  
ST16C450
SYMBOL DESCRIPTION
Symbol
www.DataSheet4U.com
-IOR
-IOW
INT
CSOUT
-BAUDOUT
-DDIS
-OP1
RESET
RCLK
Rev. 4.20
Pin Signal
40 44 48 type
Pin Description
21 24 19
I Read data strobe (active low strobe). A logic 0 on this pin
transfers the contents of the ST16C450 data bus to the
CPU.
18 20 16
I Write data strobe (active low strobe). A logic 0 on this pin
transfers the contents of the CPU data bus to the addressed
internal register.
30 33 30
O Interrupt Request (active high). Interrupts are enabled in the
interrupt enable register (IER), and when an interrupt con-
dition exists. Interrupt conditions include: receiver errors,
available receiver buffer data, transmit buffer empty, or
when a modem status flag is detected.
24 27 23 O Chip select out. A high on this pin indicates that the
ST16C450 has been enabled by the chip select pin.
15 17 12 O Baud Rate Generator Output. This pin provides the 16X
clock of the selected data rate from the baud rate generator.
The RCLK pin must be connected externally to -BAUDOUT
when the receiver is operating at the same data rate.
23 26 22 O Drive Disable. This pin goes to a logic 0 when the external
CPU is reading data from the ST16C450. This signal can be
used to disable external transceivers or other logic func-
tions.
34 38 34 O Output-1 (User Defined) - See bit-2 of modem control
register (MCR bit-2).
35 39 35
I Reset. (active high) - A logic 1 on this pin will reset the
internal registers and all the outputs. The UART transmitter
output and the receiver input will be disabled during reset
time. (See ST16C450 External Reset Conditions for initial-
ization details.)
9 10 5
I Receive Clock Input. This pin is used as external 16X clock
input to the receiver section. External connection to -
Baudout pin is required in order to utilize the internal baud
rate generator.
5
5 Page 
ST16C450
Figure 4, INTERNAL LOOPBACK MODE DIAGRAM
www.DataSheet4U.com
D0-D7
-IOR,IOR
-IOW,IOW
RESET
A0-A2
-AS
CS0,CS1
-CS2
-DDIS
CSOUT
INT
Transmit
Holding
Registers
Transmit
Shift
Register
Receive
Holding
Registers
Receive
Shift
Register
Clock
&
Baud Rate
Generator
TX
RX
-RTS
-CD
-DTR
-RI
-OP1
-DSR
-OP2
-CTS
Rev. 4.20
11
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| PDF Descargar | [ Datasheet 16C450.PDF ] | |
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