Document
C-MOS 16 M (4,194,304 x 4)-BIT DYNAMIC RAM
—TOP VIEW—
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aS
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m o .c
HM51W16400BS6 (1/2) IL08
9
VDD (+3.3 V)
GND 26 25 I/O4 I/O 24 I/O3 I/O 23 CAS IN 22 OE IN 21 A9 IN
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 RAS CAS WE OE 5 23 4 22 I/O1 I/O2 I/O3 I/O4 2 3 24 25
10 11 12 15 16 17
I/O
I/O
WE IN 4 RAS IN 5
A11 IN 6
18 19 21 8 6
A10 IN 8 A0 IN 9 A1 IN 10 A2 IN 11 A3 IN 12 13 VDD (+3.3 V)
19 A8 IN 18 A7 IN 17 A6 IN 16 A5 IN
INPUT A0 - A11
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GND 14
15 A4 IN
S a
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CAS OE RAS WE
U 4 t e
: : : : :
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m o
ADDRESS COLUMN ADDRESS STROBE OUTPUT ENABLE ROW ADDRESS STROBE READ/WRITE ENABLE
INPUT/OUTPUT I/O1 - I/O4 : DATA
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m o .c
HM51W16400BS6 (2/2)
RAS 5 CAS 23 WE 4 OE 22
RAS
CONTROL CIRCUIT
CAS
CONTROL CIRCUIT
WE
CONTROL CIRCUIT
OE
CONTROL CIRCUIT
25
I/O4 BUFFER 256 K MEMORY ARRAY x 16 SENSE AMP. & I/O BUS x 17 COLUMN DECODER & DRIVER 256 K MEMORY ARRAY x 16 SENSE AMP. & I/O BUS x 17 ROW DECODER & DRIVER ROW DECODER & DRIVER 256 K MEMORY ARRAY x 16 I/O3 BUFFER SENSE AMP. & I/O BUS x 17 COLUMN DECODER & DRIVER I/O2 BUFFER 256 K MEMORY ARRAY x 16 I/O1 BUFFER SENSE AMP. & I/O BUS x 17
I/O4
24
I/O3
3
I/O2
2
I/O1
COLUMN ADDRESS BUFFER
ROW ADDRESS BUFFER
6, 8 - 12, 15 - 9, 21 A0 - A11
.