P4C1681, P4C1682
P4C1681, P4C1682
ULTRA HIGH SPEED 4K x 4
STATIC CMOS RAMS
FEATURES
Full CMOS, 6T Cell
High Speed (Equal Access and Cycle Times)
鈥?12/15/20/25 ns (Commercial)
鈥?20/25/35ns (P4C1682 Military)
Low Power Operation (Commercial)
鈥?715 mW Active 鈥?12, 15
鈥?550 mW Active 鈥?20/25/35
鈥?193 mW Standby (TTL Input)
鈥?83 mW Standby (CMOS Input)
Single 5V
鹵
10%Power Supply
Separate Inputs and Outputs
鈥?P4C1681 Input Data at Outputs during Write
鈥?P4C1682 Outputs in High Z during Write
Fully TTL Compatible Inputs and Outputs
Standard Pinout (JEDEC Approved)
鈥?24-Pin 300 mil DIP
鈥?24-Pin 300 mil SOIC
鈥?24-Pin 300 mil SOJ
鈥?24-Pin CERDIP
鈥?28-Pin LCC (450 mil x 450 mil)
DESCRIPTION
The P4C1681 and P4C1682 are 16,384-bit (4K x 4) ultra
high speed static RAMs similar to the P4C168, but with
separate data I/O pins. The P4C1681 features a
transparent write operation; the outputs of the P4C1682
are in high impedance during the write cycle. All devices
have low power standby modes. The RAMs operate from
a single 5V
鹵
10% tolerance power supply.
Access times as fast as 12 nanoseconds are available,
permitting greatly enhanced system operating speeds.
CMOS is used to reduce power consumption to a low 715
mW active, 193 mW standby. For the P4C1682 and
P4C1681, power is only 83 mW standby with CMOS input
.
levels.
The P4C1681 and P4C1682 are available in 24-pin 300
mil DIP and SOIC packages providing excellent board
level densities. The P4C1682 is also available in a 28-pin
LCC package.
FUNCTIONAL BLOCK DIAGRAM
A
(7)
A
I
1
I
2
I
3
I
4
O
1
O
2
COLUMN I/O
ROW
SELECT
16,384-BIT
MEMORY
ARRAY
PIN CONFIGURATIONS
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
A0
VCC
A3
A2
A1
A11
A10
A9
A8
I4
I3
O4
O3
O2
O1
WE
A4
A5
NC
NC
A6
A7
I1
12
4
5
6
7
8
9
3
2
1
28 27
A 10
26
25
24
23
22
21
20
19
A11
A9
A8
I4
NC
NC
I3
O4
INPUT
DATA
CONTROL
O
3
O
4
10
11
13 14 15 16 17
POWER
DOWN
CE
WE
P4C1682
P4C1681
COLUMN
SELECT
I1
I2
CE
GND
18
CE
GND
WE
O1
A
(5)
A
DIP (P4,D4), SOIC (S4), SOJ (J4)
TOP VIEW
LCC (L5-1)
TOP VIEW
Means Quality, Service and Speed
1Q97
41
O2
O3
I2
1
2
3
4
5
6
