CAT28C257 查看數據表（PDF） - ON Semiconductor
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CAT28C257 Datasheet PDF : 13 Pages
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A7−A14
VCC
CE
OE
WE
A0−A6
CAT28C257
PIN CONFIGURATION
DIP Package (P, L)
PLCC Package (N, G)
A14
A12
A7
1 28
2 27
3 26
A6 4 25
A5
A4
A3
5
6
7
24
23
22
A2 8 21
A1 9 20
A0 10 19
I/O0 11 18
I/O1 12 17
VCC
WE
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
4 3 2 1 32 31 30
A6
A5
5
6
29
28
A4 7
27
A3 8
26
A2 9
25
A1 10
24
A0 11
23
NC 12
22
I/O0 13
21
14 1516 171819 20
A8
A9
A11
NC
OE
A10
CE
I/O7
I/O6
I/O2 13 16 I/O4
VSS 14 15 I/O3
(Top Views)
ADDR. BUFFER
& LATCHES
INADVERTENT
WRITE
PROTECTION
CONTROL
LOGIC
TIMER
ADDR. BUFFER
& LATCHES
ROW
DECODER
HIGH VOLTAGE
GENERATOR
DATA POLLING
AND
TOGGLE BIT
COLUMN
DECODER
Figure 1. Block Diagram
32,768 x 8
EEPROM
ARRAY
128 BYTE PAGE
REGISTER
I/O BUFFERS
I/O0−I/O7
http://onsemi.com
2
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