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PDF ST16C2450 Data sheet ( Hoja de datos )
| Número de pieza | ST16C2450 | |
| Descripción | DUAL UNIVERSAL ASYNCHRONOUSRECEIVER/TRANSMITTER | |
| Fabricantes | STARTECH | |
| Logotipo |  |
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STARTECH
ST16C2450
An Company
Printed June 19, 1996
DUAL UNIVERSAL ASYNCHRONOUSRECEIVER/TRANSMITTER
DESCRIPTION
The ST16C2450 is a dual universal asynchronous
receiver and transmitter. Independent programmable
baud rate generators are provided to select transmit
and receive clock rates from 50Hz to 1.5 MHz for each
UART section.
The ST16C2450 is an improved version of the
NS16C450 UART with higher operating speed and
lower access time. The ST16C2450 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 ST16C2450
provides internal loop-back capability for on board
diagnostic testing.
The ST16C2450 is fabricated in an advanced 1.2m
CMOS process to achieve low drain power and high
speed requirements.
PLCC Package
D5 7
D6 8
D7 9
RXB 10
RXA 11
N.C. 12
TXA 13
TXB 14
OPB* 15
CSA* 16
CSB* 17
ST16C2450CJ44
39 RESET
38 DTRB*
37 DTRA*
36 RTSA*
35 OPA*
34 N.C.
33 INTA
32 INTB
31 A0
30 A1
29 A2
Plastic-DIP Package
FEATURES
· Functional compatible to NS16450, VL16C450,
WD16C450
· Modem control signals (CTS*, RTS*, DSR*, DTR*,
RI*, CD*)
· Programmable character lengths (5, 6, 7, 8)
· Even, odd, or no parity bit generation and detection
· Status report register
· Independent transmit and receive control
· TTL compatible inputs, outputs
· 460.8 kHz transmit/receive operation with 7.372
MHz crystal or external clock source
ORDERING INFORMATION
Part number
Package Operating temperature
ST16C2450CP40 Plastic-DIP 0° C to + 70° C
ST16C2450CJ44 PLCC
0° C to + 70° C
*Industrial operating range are available
Rev. 2.1
3-21
D0 1
D1 2
D2 3
D3 4
D4 5
D5 6
D6 7
D7 8
RXB 9
RXA 10
TXA 11
TXB 12
OPB* 13
CSA* 14
CSB* 15
XTAL1 16
XTAL2 17
IOW* 18
CDB* 19
GND 20
40 VCC
39 RIA*
38 CDA*
37 DSRA*
36 CTSA*
35 RESET
34 DTRB*
33 DTRA*
32 RTSA*
31 OPA*
30 INTA
29 INTB
28 A0
27 A1
26 A2
25 CTSB*
24 RTSB*
23 RIB*
22 DSRB*
21 IOR*
1 page  
ST16C2450
SYMBOL DESCRIPTION
Symbol
VCC
GND
Pin
40 44
40 44
20 22
Signal Type
Pin Description
I Power supply input.
O Signal and power ground.
PROGRAMMING TABLE
A2 A1 A0
000
001
010
011
100
101
110
111
000
001
READ MODE
Receive Holding Register
Interrupt Status Register
Line Status Register
Modem Status Register
Scratchpad Register
WRITE MODE
Transmit Holding Register
Interrupt Enable Register
Line Control Register
Modem Control Register
Scratchpad Register
LSB of Divisor Latch
MSB of Divisor Latch
D5
D6
D7
RXB
RXA
N.C.
TXA
TXB
OPB*
CSA*
CSB*
N.C.
1
2
3
4
5
6
7
8
9
10
11
12
ST16C2450CQ48
36 RESET
35 DTRB*
34 DTRA*
33 RTSA*
32 OPA*
31 N.C.
30 INTA
29 INTB
28 A0
27 A1
26 A2
25 N.C.
3-25
5 Page 
ST16C2450
AC ELECTRICAL CHARACTERISTICS
TA=0° - 70° C, Vcc=5.0 V ± 10% unless otherwise specified.
Symbol
Parameter
Limits
Units
Min Typ Max
Conditions
T1 Clock high pulse duration
20
T2 Clock low pulse duration
20
T3 Clock rise/fall time
T8 Chip select setup time
0
T9 Chip select hold time
0
T12 Data set up time
15
T13 Data hold time
15
T14 IOW* delay from chip select
10
T15 IOW* strobe width
50
T16 Chip select hold time from IOW*
0
T17 Write cycle delay
55
Tw Write cycle=T15+T17
105
T19 Data hold time
15
T21 IOR* delay from chip select
10
T23 IOR* strobe width
65
T24 Chip select hold time from IOR*
0
T25 Read cycle delay
55
Tr Read cycle=T23+T25
115
T26 Delay from IOR* to data
T28 Delay from IOW* to output
T29 Delay to set interrupt from MODEM
input
T30 Delay to reset interrupt from IOR*
T31 Delay from stop to set interrupt
T32 Delay from IOR* to reset interrupt
T33 Delay from initial INT reset to transmit 8
start
T34 Delay from stop to interrupt
T35 Delay from IOW* to reset interrupt
TR Reset pulse width
10
N Baud rate devisor
1
ns
ns
10 ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
35 ns 100 pF load
50 ns 100 pF load
70 ns 100 pF load
70 ns 100 pF load
1Rclk ns 100 pF load
200 ns 100 pF load
24 *
100
175
216-1
ns
ns
ns
Note 1: * = Baudout* cycle
3-31
11 Page | ||
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| PDF Descargar | [ Datasheet ST16C2450.PDF ] | |
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