X28HC64
PIN DESCRIPTIONS
Addresses (A0–A12)
PIN NAMES
Symbol
A –A
Description
Address Inputs
Data Input/Output
Write Enable
Chip Enable
Output Enable
+5V
The Address inputs select an 8-bit memory location
during a read or write operation.
0
12
I/O –I/O
0
7
WE
CE
OE
Chip Enable (CE)
The Chip Enable input must be LOW to enable all read/
writeoperations.WhenCEisHIGH,powerconsumption
is reduced.
V
CC
V
SS
Ground
Output Enable (OE)
NC
No Connect
TheOutputEnableinputcontrolsthedataoutputbuffers
and is used to initiate read operations.
3857 PGM T01
Data In/Data Out (I/O0–I/O7)
Data is written to or read from the X28HC64 through the
I/O pins.
Write Enable (WE)
The Write Enable input controls the writing of data to the
X28HC64.
FUNCTIONAL DIAGRAM
65,536-BIT
2
E PROM
X BUFFERS
LATCHES AND
DECODER
ARRAY
A –A
0
12
ADDRESS
INPUTS
I/O BUFFERS
AND LATCHES
Y BUFFERS
LATCHES AND
DECODER
I/O –I/O
0
7
DATA INPUTS/OUTPUTS
CE
OE
WE
CONTROL
LOGIC AND
TIMING
V
CC
V
3857 FHD F01
SS
2
XICOR [ XICOR INC. ]
