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c-mos 1m (131,072x8)-bit static ram
- top view - TC55B8128J-15 (1/2)
il11 13
14
15
16
17
18
19
20
21
29
30
31
32
1
2
3
4
5
12
28 a16
a15
a14
a13
a12
a11
a10
a9
a8
a7
a6
a5
a4
a3
a2
a1
a0
ce
we
oe i/o8
i/o7
i/o6
i/o5
i/o4
i/o3
i/o2
i/o1 27
26
23
22
11
10
7
6 a3 in
a2 in
a1 in
a0 in
ce in
i/o1
i/o2
i/o3
i/o4
we in
a16 in
a15 in
a14 in
a13 in 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17 a4 in
a5 in
a6 in
a7 in
oe in
i/o8
i/o7
i/o6
i/o5
a8 in
a9 in
a10 in
a11 in
a12 in gnd input
a0 - a16
ce
oe
we
input/output
i/o1 - i/o8
; address
; chip enable
; output buffer control
; write enable
; data v dd (+5 v) v dd (+5 v) gnd active mode
read
write
output disable
standby 0 1 ; ; low level high level hi-z
x ;
; high impedance
don't care ce
0
0
0
1 oe
0
x
1
x we
1
0
1
x i/o
d out
d in
hi-z
hi-z power
i ddo
i ddo
i ddo
i dds
TC55B8128J-15 (2/2) row
address
buffer 1-4, 21
29-32 a0-a8 row
decoder memory
cell array
512x256x8
(1,048,576) i/o1 6 i/o2 7 i/o3 10 i/o4 11 i/o5 22 i/o6 23 i/o7 26 i/o8 27 ce 5 we 12 oe 28 a9-a16 20-13 i/o
circuit column
decoder column
address
buffer ce
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