CMOS Programmable peripheral
Interface
WS82C55A
Features
Description
The WS82C55A is a high performance CMOS version of
the industry standard 8255A and is manufactured using a
self-aligned silicon gate CMOS process (Scaled SAJI IV). It
is a general purpose programmable I/O device which may be
used with many different microprocessors. There are 24 I/O
pins which may be individually programmed in 2 groups of
12 and used in 3 major modes of operation. The high
performance and industry standard configuration of the
• Pin Compatible with NMOS 8255A
• 24 Programmable I/O Pins
• Fully TTL Compatible
• High Speed, No “Wait State” Operation with 5MHz
and 8MHz 80C88
80C86
• Direct Bit Set/Reset Capability
WS82C55A
make it compatible with the 80C86, and
• Enhanced Control Word Read Capability
• L7 Process
other microprocessors.
Static CMOS circuit design insures low operating power. TTL
compatibility over the full military temperature range and bus
hold circuitry eliminate the need for pull-up resistors. The
advanced SAJI process results in performance equal
to or greater than existing functionally equivalent products at
a fraction of the power.
• 2.5mA Drive Capability on All I/O Ports
• Low Standby Power (ICCSB) . . . . . . . . . . . . . . . . .10µA
Ordering Information
TEMPERATURE
SPEED
5MHz
5MHz
SPEED
PART NUMBERS
PART NUMBERS
WS82C55A-5P
WS82C55A-5C
WS82C55A-5Q
PKG.
RANGE
0 C to 70oC
o
40DIP
8MHz
8MHz
8MHz
WS82C55AP
WS82C55AC
o
o
44 PLCC
44 QFP
0 C to 70 C
o
o
0 C to 70 C
WS82C55AQ
5MHz
Pinouts
1
2
40
39
38
37
36
35
34
PA3
PA2
PA1
PA0
RD
PA4
PA5
PA6
PA7
WR
RESET
D0
6
5
4
3
2
1 44 43 42 41 40
3
CS
GND
A1
1
2
3
4
5
6
7
8
9
33 RESET
32 D0
4
CS
GND
A1
A0
PC7
NC
7
8
9
39
38 D0
37 D1
RESET
5
WS82C55A-5C
WS82C55AC
6
CS
WS82C55A-5Q
WS82C55AQ
31 D1
WS82C55A-5P
10
11
12
13
14
15
16
17
D2
D3
NC
D4
D5
D6
D7
V
36
35
34
33
32
31
30
29
7
GND
A1
A0
30
29
28
27
26
25
24
D2.
D3
D4
D5
D6
D7
VCC
8
WS82C55AP 33
D1
PC7
PC6
PC5
PC4
PC0
9
32
31
30
29
A0
D2
PC6
PC5
PC4
PC0
PC1
10
11
12
13
14
15
16
17
18
19
20
PC7
PC6
PC5
PC4
PC0
PC1
PC2
PC3
PB0
PB1
PB2
D3
PLCC-44
D4
QFP-44
D5
28
DIP-40
27
D6
CC
D7
18 1920 21 22 23 24 25 26 27 28
PC1 10
PC2 11
26 V
CC
PB7
23 PB7
25
24
23
22
21
PB6
PB5
PB4
PB3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com