L7C108
L7C109
128K x 8 Static RAM
L7C108-109 Block Diagram
128 K x 8
MEMORY ARRAY
9
ROW
ADDRESS
CE1
WE
OE
8
COLUMN SELECT
& COLUMN SENSE
CONTROL
I/O7 - 0
CE2
(L7C109 only)
8
COLUMN ADDRESS
TRUTH
TABLE
Mode
Standby
Standby
Standby
Standby
Read
OE
X
CE1
CE2*
WE
X
DQ
POWER
6WDQGE\ꢀꢆI&&ꢂꢉꢀ
6WDQGE\ꢀꢆI&&ꢂꢉꢀ
6WDQGE\ꢀꢆI&&ꢁꢉꢀ
6WDQGE\ꢀꢆI&&ꢁꢉ
Active
X
t VIH
High - Z
High - Z
High - Z
High - Z
4
X
d VIL
X
X
X
X
t VCC - 0.2 V
X
X
d GND + 0.2 V
X
L
L
X
L
H
H
H
H
High - Z
H
Active
Read
Write
X
H
D
L
L
Active
* Note: for L7C109 only
1M Static RAMs
Feb 17, 2012 LDS-L7C108/9-G
LOGIC Devices Incorporated
www.logicdevices.com
2
LOGIC [ LOGIC DEVICES INCORPORATED ]
