P4C422-10CC PYRAMID [Pyramid Semiconductor Corporation], P4C422-10CC Datasheet - Page 3

• Manufacturer Part Number: P4C422-10CC
• Description: HIGH SPEED 256 x 4 STATIC CMOS RAM
• Manufacturer: PYRAMID [Pyramid Semiconductor Corporation]

FUNCTIONAL DESCRIPTION
An active LOW write enable (WE) controls the writing/
reading operation of the memory. When the chip select
one (CS
select two (CS
(D
and preconditions the output circuitry so that true data is
present at the outputs when the write cycle is complete.
This preconditioning operation insures minimum write
TRUTH TABLE
TIMING WAVEFORM OF READ CYCLE
AC ELECTRICAL CHARACTERISTICS—READ CYCLE
(V
Document # SRAM101 REV. A
*V
Mode
Standby
Standby
D
Read
Write
t
t
t
t
t
t
ZRCS
AOS
ZROS
AA
RC
ACS
Sym.
CC
0
OUT
CC
through D
= 5V ± 10% except as noted, All Temperature Ranges)
= 5V ± 5%
Disabled
1
) and the write enable (WE) are LOW and the chip
Read Cycle Time
Chip Select Time
Chip Select to High-Z
Output Enable Time
Output Enable to High-Z
Address Access Time
3
) is written into the addressed memory word
2
) is HIGH, the information on data inputs
CS
H
H
H
X
L
2
CS
CS
CS
CS
CS
X
H
L
L
L
1
Parameter
WE
WE
(5)
WE
WE
WE
(5)
H
X
X
X
L
(6)
(5)
OE
OE
OE
OE
OE
(6)
H
X
X
X
L
Output
High Z
High Z
High Z
High Z
D
OUT
Min Max
12
(2)
-10*
7.5
7.5
10
8
8
Notes:
H
L
X
HIGH Z = Implies outputs are disabled or off. This condition
recovery times by eliminating the “write recovery glitch.”
Reading is performed with chip selct one (CS
select two (CS
output enable (OE) LOW. The information stored in the
addressed word is read out on the noninverting outputs
(O
inactive high impedance state whenever chip select one
(CS
enable (WE) is LOW.
Min
0
12
1
through O
) is HIGH, or during the write operation when write
-12
Max
10
10
12
= HIGH
= Low
= Don't Care
8
8
is defined as high impedance state for the
P4C422.
Min
15
-15
3
). The outputs of the memory go to an
2
) HIGH, write enable (WE) HIGH and
Max
12
12
15
8
8
Min
20
-20
Max
12
15
12
15
20
Min
25
-25
Max
15
20
15
20
25
Min
35
-35
Page 3 of 10
1
) LOW, chip
Max
25
30
25
30
35
P4C422
Unit
ns
ns
ns
ns
ns
ns