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C-MOS 256K (32768x8)-BIT EEPROM
--TOP VIEW--
10
HN58C256P-20(1/2) IL00
A14 A12 A7 A6 A5 A4 A3 A2 A1 A0
IN
1 2 3 4 5 6 7 8 9 10
VDD (+5V) 28 27 WE 26 A13 25 A8 24 A9 23 A11 22 OE 21 A10 20 CE
IN
9 8
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14
IN
7
IN
IN
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6 5 4
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11 12 13 15 16 17 18 19
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I/O 0 I/O 1 I/O 2 I/O 3 I/O 4 I/O 5 I/O 6 I/O 7
IN
IN
3 25
IN
IN
24 21
IN
IN
23 2
IN
IN
26 1
IN
IN 22
IN
IN 20
OE
IN
19 I/O 7 18 I/O 6 17 I/O 5 16 I/O 4 15 I/O 3 PIN MODE READ STANDBY WRITE DESELECT WRITE INHIBIT WRITE INHIBIT
CE WE
27
I/O 0 11 I/O 1 12 I/O 2 13 14 GND
CE 0 1 0 0 X X
OE 0 X 1 1 X 0
WE 1 X 0 1 1 X
I/O DOUT HI-Z DIN HI-Z -- --
0 ; LOW LEVEL 1 ; HIGH LEVEL X ; DON'T CARE HI-Z ; HIGH IMPEDANCE
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A0-A14 I/O0-I/O7 CE OE WE
; ADDRESS INPUT ; DATA INPUT/OUTPUT ; CHIP ENABLE INPUT ; OUTPUT ENABLE INPUT ; WRITE ENABLE INPUT
HN58C256P-20(2/2)
22 OE
CE WE
20 27
CONTROL LOGIC AND TIMING
10 - 5 A0 - A5
Y DECODER ADDRESS BUFFER AND LATCH X DECODER
11 - 13 15 - 19
Y GATING
I/O BUFFER AND INPUT LATCH
I/O 0 - I/O 7
4, 3, 25, 24 21, 23, 2, 26, 1 A6 -14
MEMORY ARRAY
DATA LATCH
HIGH VOLTAGE GENERATOR

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