CMOS 4M-Bit DRAM
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UPD424400LA-80L(1/2) IL08
C-MOS 4M (1,048,576WORDx4)-BIT DYNAMIC RAM
9 10 11 12 14 15 16 17 18...
Description
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- TOP VIEW -
UPD424400LA-80L(1/2) IL08
C-MOS 4M (1,048,576WORDx4)-BIT DYNAMIC RAM
9 10 11 12 14 15 16 17 18 5
I/O1 1 I/O2 2 WE IN 3 RAS IN 4 A9 IN 5
GND 26 25 I/O4 24 I/O3 23 CAS
IN
22 OE IN
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
1 I/O1 2 I/O2 24 I/O3 25 I/O4
A0 IN 9 A1 IN 10 A2 IN 11 A3 IN 12 13 V DD (+5V)
18 A8 17 A7 16 A6 15 A5 14 A4
IN IN IN IN IN
A0-A9 CAS I/O1-I/O4 OE RAS WE
; ADDRESS INPUTS ; COLUMN ADDRESS STROBE INPUT ; DATA INPUTS/OUTPUTS ; OUTPUT ENABLE INPUT ; ROW ADDRESS STROBE INPUT ; WRITE ENABLE INPUT
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23 CAS 4 RAS
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WE 3
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RAS
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CAS DATA OUTPUT BUFFER CAS BEFORE RAS COUNTER 1024 MEMORY CELL ARRAY 1024x1024x4 1024x4 X0-X9 SENSE AMPLIFIER 1024 COLUMN DECODER x4
23
OE
WE
3
CLOCK GENERATOR
5, 9-12 14-18 A0 A9 Y0-Y9
ROW ADDRESS BUFFER
UPD424400LA-80L(2/2)
COLUMN ADDRESS BUFFER
ROW DECODER
1,2,24,25 I/O1-I/O4
DATA INPUT BUFFER
...
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