X20C17
PIN DESCRIPTIONS
Addresses (A0–A10)
PIN NAMES
Symbol
Description
Address Inputs
Data Input/Output
Write Enable
Chip Enable
Output Enable
+5V
A –A
0
10
The Address inputs select an 8-bit memory location
during a read or write operation.
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
SS
V
Ground
2015 PGM T01
Output Enable (OE)
TheOutputEnableinputcontrolsthedataoutputbuffers
and is used to initiate read and recall operations. Output
Enable LOW disables a store operation regardless of
the state of CE, WE.
Data In/Data Out (I/O0–I/O7)
Data is written to or read from the X20C17 through the
I/O pins. The I/O pins are placed in the high impedance
state when either CE or OE is HIGH.
Write Enable (WE)
The Write Enable input controls the writing of data to the
static RAM.
FUNCTIONAL DIAGRAM
V
SENSE
CC
EEPROM ARRAY
ROW
SELECT
HIGH SPEED
2K x 8
RECALL
A –A
3
8
SRAM
ARRAY
ORE
ST
CE
OE
WE
CONTROL
LOGIC
COLUMN
SELECT
&
A –A
0
2
I/OS
A –A
9
10
I/O –I/O
0
7
2015 FHD F01.1
2
XICOR [ XICOR INC. ]
