QUAD UNIVERSAL ASYNCHRONOUS
RECEIVER/TRANSMITTER (UART)
ST16C454
ST68C454
DESCRIPTION
The ST16C454 is a universal asynchronous receiver
and transmitter (UART) with a dual foot print interface.
The 454 is an enhanced UART with data rates up to
1.5Mbps and software compatible to ST16C450.
Onboard status registers provide the user with error
indications and operational status, modem interface
control. System interrupts may be tailored to meet
user requirements. An internal loop-back capability
allows onboard diagnostics. The ST16C454 offer an
additional 68 mode which allows easy integration with
Motorola, and other popular microprocessors. The
454 combines the package interface modes of the
ST16C454 and ST68C454 series on a single inte-
grated chip.
PLCC Package
INTSEL
-CDD
61
-CDA
GND
VCC
RXD
63
RXA
68
67
66
65
64
-DSRA
-CTSA
-DTRA
VCC
-RTSA
INTA
-CSA
TXA
-IOW
TXB
-CSB
INTB
-RTSB
GND
-DTRB
-CTSB
-DSRB
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
62
9
8
7
6
5
4
3
2
1
-RID
-RIA
D7
D6
D5
D4
D3
D2
D1
D0
60
59
58
57
56
55
54
-DSRD
-CTSD
-DTRD
GND
-RTSD
INTD
-CSD
TXD
-IOR
TXC
-CSC
INTC
-RTSC
VCC
-DTRC
-CTSC
-DSRC
ST16C454CJ68
16 MODE
53
52
51
50
49
48
47
46
45
44
VCC
RXC
RESET
16/-68
XTAL1
XTAL2
•
Software compatibility with the Industry Standard
16C450
•
1.5 Mbps transmit/receive operation (24MHz)
•
Independent transmit and receive control
•
Software selectable Baud Rate Generator
•
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
•
Internal loop-back diagnostics
•
TTL compatible inputs, outputs
•
Low power
68
67
66
65
64
63
62
-DSRA
-CTSA
-DTRA
VCC
-RTSA
-IRQ
-CS
TXA
R/-W
TXB
A3
N.C.
-RTSB
GND
-DTRB
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
61
60
59
58
57
56
55
54
9
8
7
6
5
4
3
2
1
-CDD
-CDA
GND
VCC
RXD
RXA
-RID
-RIA
N.C.
D7
D6
D5
D4
D3
D2
D1
D0
-CDC
-CDB
RXB
A2
A1
A0
GND
-RIC
-RIB
N.C.
N.C.
FEATURES
-DSRD
-CTSD
-DTRD
GND
-RTSD
N.C.
N.C.
TXD
N.C.
TXC
A4
N.C.
-RTSC
VCC
-DTRC
-CTSC
-DSRC
ST16C454CJ68
68 MODE
53
52
51
50
49
48
47
46
45
44
ORDERING INFORMATION
Part number
-CTSB
-DSRB
ST16C454CJ68
ST16C454IJ68
68
68
VCC
RXC
-RESET
16/-68
XTAL1
XTAL2
Rev. 3.20
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
•
(510) 668-7000
•
FAX (510) 668-7017
-CDC
-CDB
RXB
A2
A1
A0
GND
-RIC
-RIB
N.C.
N.C.
Pins Package
PLCC
PLCC
Operating temperature
0° C to + 70° C
-40° C to + 85° C
EXAR [ EXAR CORPORATION ]
