117
P4C1256
P4C1256
HIGH SPEED 32K x 8
STATIC CMOS RAM
High Speed (Equal Access and Cycle Times)
— 12/15/20/25/35 ns (Commercial)
— 15/20/25/35/45 ns (Industrial)
— 20/25/35/45/55/70 ns (Military)
Low Power
— 880 mW Active (Commercial)
Single 5V
±10% Power Supply
Easy Memory Expansion Using
CE
CE
CE
CE
CE and OE
OE
OE
OE
OE
Inputs
Common Data I/O
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
1519B
1Q97
Means Quality, Service and Speed
INPUT
DATA
CONTROL
262,144-BIT
MEMORY
ARRAY
COLUMN I/O
I/O
1
I/O
2
COLUMN
SELECT
WE
OE
CE
A
A
A
• • •
A
(7)
(8)
• • •
Three-State Outputs
Fully TTL Compatible Inputs and Outputs
Advanced CMOS Technology
Fast t
OE
Automatic Power Down
Packages
—28-Pin 300 mil DIP and SOJ
—28-Pin 600 mil Ceramic DIP
—28-Pin LCC(350 mil x 550 mil)
—32-Pin LCC (450 mil x 550 mil)
FEATURES
DESCRIPTION
The P4C1256 is a 262,144-bit high-speed CMOS
static RAM organized as 32Kx8. The CMOS memory
requires no clocks or refreshing, and has equal access
and cycle times. Inputs are fully TTL-compatible. The
RAM operates from a single 5V
±10% tolerance power
supply.
Access times as fast as 12 nanoseconds permit greatly
enhanced system operating speeds. CMOS is utilized
to reduce power consumption to a low level. The
P4C1256 is a member of a family of PACE RAM™ prod-
ucts offering fast access times.
The P4C1256 device provides asynchronous operation with
matching access and cycle times. Memory locations are
specified on address pins A
0 to A14.
Reading is accom-
plished by device selection (
CE and output enabling (OE)
while write enable (
WE) remains HIGH. By presenting the
address under these conditions, the data in the addressed
memory location is presented on the data input/output pins.
The input/output pins stay in the HIGH Z state when either
CE or OE is HIGH or WE is LOW.
Package options for the P4C1256 include 28-pin 300 mil
DIP and SOJ packages. For military temperature range,
Ceramic DIP and LCC packages are available.
DIP (P5, C5, D5-1), SOJ (J5)
TOP VIEW
32 LCC (L6)
TOP VIEW
See Selection Guide page for 28-pin LCC
A10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
CE
WE
A11
OE
I/02
I/03
I/08
I/07
I/06
I/05
I/04
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
I/01
A14
A13
A12
VCC
A3
NC
CE
A12
A11
NC
29
28
27
26
25
24
23
5
6
7
8
9
10
11
12
13
22
21
14
18
3
1
16
2
15
32
17
I/O1
A10
OE
I/O8
I/O7
4
31 30
19 20
A4
A5
A6
A7
A8
A9
A13
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