CMOS 1M x 4-Bit DRAM
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c . C-MOS 1M×4-BIT U DYNAMIC RAM 4 -TOP VIEWt e e I/O1 1 h GND 20 S a I/O2 2 19 I/O4 t a3 WE 18 I/O3 D . RAS 4 17 ...
Description
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c . C-MOS 1M×4-BIT U DYNAMIC RAM 4 -TOP VIEWt e e I/O1 1 h GND 20 S a I/O2 2 19 I/O4 t a3 WE 18 I/O3 D . RAS 4 17 CAS w
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I/O I/O IN I/O I/O IN IN IN
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HM51W4400TT6-8 (1/2) IL22
6 7 8 9 11 12 13 14 15
A0 A1 A2 A3 A4 A5 A6 A7 A8 I/O1 I/O2 I/O3 I/O4 1 2 18 19
A9
5
16 OE
IN
A0 A1 A2 A3
IN IN IN IN
6 7 8 9 10 VDD (+3.3V)
15 A8 14 A7 13 A6 12 A5 11 A4
IN 17 IN IN IN IN 4 16 3 CAS RAS OE
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INPUT A0-A9 A0-A9 CAS IO1-IO4 RAS OE WE
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ADDRESS INPUTS REFRESH ADDRESS INPUTS COLUMN ADDRESS STROBE INPUT DATA INPUTS/OUTPUTS ROW ADDRESS STROBE INPUT OUTPUT ENABLE INPUT READ/WRITE ENABLE INPUT
U 4 t e
WE
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RAS 4
RAS CONTROL CIRCUIT
256 K MEMORY ARRAY MAT I/O1 BUFFER I/O BUS & COLUMN DECODER 256 K MEMORY ARRAY MAT 256 K MEMORY ARRAY MAT I/O BUS & COLUMN DECODER 256 K MEMORY ARRAY MAT ROW DRIVER ROW DRIVER 256 K MEMORY ARRAY MAT I/O BUS & COLUMN DECODER ROW DRIVER ROW DRIVER 256 K MEMORY ARRAY MAT ROW DRIVER ROW DRIVER 256 K MEMORY ARRAY MAT I/O BUS & COLUMN DECODER
ROW DRIVER ROW DRIVER 256 K MEMORY ARRAY MAT
CAS 17
CAS CONTROL CIRCUIT
ROW ADDRESS BUFFER I/O2 BUFFER
WE 3
WE CONTROL CIRCUIT
ADDRESS
ROW DECODER & PERIPHERAL CIRCUIT
A0-A9 256 K MEMORY ARRAY MAT I/O BUS & COLUMN DECODER 256 K MEMORY ARRAY MAT 256 K MEMORY ARRAY MAT I/O BUS & COLUMN DECODER 256 K MEMORY ARRAY MAT ROW DRIVER ROW DRIVER ROW DRIVER ROW DRIVER ROW DRIVER ROW DRIVER ROW DRIVER ROW DRIVER
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