X28HC256 Xicor, X28HC256 Datasheet - Page 2

• Manufacturer Part Number: X28HC256
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28HC256
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 X28HC256 through
the I/O pins.
Write Enable (WE)
The Write Enable input controls the writing of data to the
X28HC256.
FUNCTIONAL DIAGRAM
0
–A
14
)
0
–I/O
ADDRESS
INPUTS
A 0 –A 14
7
)
V CC
V SS
WE
CE
OE
LATCHES AND
LATCHES AND
X BUFFERS
Y BUFFERS
LOGIC AND
DECODER
DECODER
CONTROL
TIMING
2
PIN CONFIGURATION
PIN NAMES
A
I/O
WE
CE
OE
V
V
NC
Symbol
0
CC
SS
DATA INPUTS/OUTPUTS
–A
0
–I/O
14
AND LATCHES
I/O BUFFERS
256K-BIT
E 2 PROM
7
I/O 0 –I/O 7
ARRAY
12
11
9
7
5
4
3859 FHD F01
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)
X28HC256
PGA
15
14
28
1
Address Inputs
Data Input/Output
Write Enable
Chip Enable
Output Enable
+5V
Ground
No Connect
I/O 3
V SS
V CC
A 14
Description
17
16
20
22
24
27
I/O 5
I/O 4
CE
OE
A 9
WE
18
19
21
23
25
26
I/O 6
I/O 7
A 10
A 11
A 8
A 13
3859 FHD F04
3859 FHD F01
3859 PGM T01