P93U422
P93U422
HIGH SPEED 256 x 4
STATIC CMOS RAM
FEATURES
Universal 256 x 4 Static RAM
One part, the 93U422, replaces the following
bipolar and CMOS parts:
鈥?93422A
鈥?93422
鈥?93L422A
鈥?93L422
Fast Access Time
鈥?35 ns (Commercial)
鈥?35 ns (Military)
Standard 400 mil DIP and Chip carrier packages
CMOS for Low Power
鈥?440 mW (Commercial)
鈥?495 mW (Military)
5V Power Supply
鹵
10% for both commercial
and military temperature ranges
Separate I/O
Fully static operation with equal access and
cycle times
Resistant to single event upset and latchup due
to advanced process and design improvements
DESCRIPTION
The P93U422 is a 1,024-bit high-speed Static RAM with
a 256 x 4 organization. The P93U422 is a universal
device designed to replace the entire 93 and 93L 256 x 4
static RAM families. The memory requires no clocks or
refreshing and has equal access and cycle times. Inputs
and outputs are fully TTL compatible. Operation is from a
single 5 Volt supply. Easy memory expansion is provided
by an active LOW chip select one (CS
1
) and active HIGH
chip select two (CS
2
) as well as 3-state outputs.
In addition to high performance, the device features
latch-up protection, single event and upset protection.
The P93U422 is offered in several packages: 22-pin 400
mil DIP (plastic and ceramic), 24-pin 300 mil SOIC, 24-
pin LCC and 24-pin CERPACK. Devices are offered in
both commercial and military temperature ranges.
FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATIONS
CS
2
CS
1
A3
A2
A1
A0
A5
A6
A7
GND
D0
O0
D1
NC
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
D
0
D
1
D
2
D
3
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
DATA INPUT
CONTROL
WE
OE
V CC
A4
WE
CS
1
OE
CS 2
O3
D3
O2
D2
O1
NC
32 X 32
ARRAY
ROW
DECODER
SENSE AMPS
O
0
O
1
O
2
O
3
A3
A2
A1
A0
A5
A6
A7
GND
D0
O0
D1
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
V CC
A4
WE
CS
1
OE
CS 2
O3
D3
O2
D2
O1
INDEX
A1 A2 A3 VCC A4 WE
3
2
1
24
23
22
21
20
19
18
17
10
D0
11
O0
12
13
14
16
15
A
0
4
5
6
7
8
9
CS1
OE
CS2
NC
O3
D3
A5
NC
A6
A7
GND
D1 O1
D 2 O2
COLUMN
DECODER
SOIC (S4)
TOP VIEW
DIP (P3-1, D3-1)
TOP VIEW
LCC (L4)
TOP VIEW
Means Quality, Service and Speed
1Q97
7
1
2
3
4
5
6
