X28C256D Xicor, X28C256D Datasheet - Page 2

• Manufacturer Part Number: X28C256D
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28C256
PIN DESCRIPTIONS
Addresses (A
The Address inputs select an 8-bit memory location
during a read or write operation.
Chip Enable (CE)
The Chip Enable input must be LOW to enable all read/
write operations. When CE is HIGH, power consumption
is reduced.
Output Enable (OE)
The Output Enable input controls the data output buffers
and is used to initiate read operations.
Data In/Data Out (I/O
Data is written to or read from the X28C256 through the
I/O pins.
Write Enable (WE)
The Write Enable input controls the writing of data to the
X28C256.
FUNCTIONAL DIAGRAM
0
–A
14
)
0
–I/O
ADDRESS
7
INPUTS
A 0 –A 14
)
V CC
V SS
WE
CE
OE
LATCHES AND
LATCHES AND
X BUFFERS
Y BUFFERS
LOGIC AND
DECODER
DECODER
CONTROL
TIMING
2
PIN NAMES
PIN CONFIGURATION
A
I/O
WE
CE
OE
V
V
NC
Symbol
DATA INPUTS/OUTPUTS
0
CC
SS
–A
0
–I/O
AND LATCHES
I/O BUFFERS
14
256K-BIT
E 2 PROM
I/O 0 –I/O 7
ARRAY
7
12
11
9
7
5
4
I/O 1
I/O 0
A 1
A 3
A 5
A 6
13
10
8
6
2
3
I/O 2
A 0
A 2
A 4
A 12
A 7
BOTTOM VIEW
X28C256
PGA
15
14
28
1
I/O 3
V SS
V CC
A 14
Address Inputs
Data Input/Output
Write Enable
Chip Enable
Output Enable
+5V
Ground
No Connect
17
16
20
22
24
27
I/O 5
I/O 4
CE
OE
A 9
WE
Description
18
19
21
23
25
26
I/O 6
I/O 7
A 10
A 11
A 8
A 13
3855 FHD F04
3855 FHD F01
3855 PGM T01