X20C16 Xicor, X20C16 Datasheet - Page 2

• Manufacturer Part Number: X20C16
• Description: High Speed AUTOSTORE NOVRAM
• Manufacturer: Xicor

X20C16
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 and recall operations. Output
Enable LOW disables a store operation regardless of
the state of CE, WE, or NE.
Data In/Data Out (I/O
Data is written to or read from the X20C16 through the
I/O pins. The I/O pins are placed in the high impedance
state when either CE or OE is HIGH or when NE is LOW.
Write Enable (WE)
The Write Enable input controls the writing of data to the
static RAM.
FUNCTIONAL DIAGRAM
0
A 9 –A 10
–A
A 3 –A 8
A 0 –A 2
WE
10
CE
OE
NE
)
0
–I/O
7
)
CONTROL
LOGIC
AS
SELECT
ROW
2
Nonvolatile Enable (NE)
The Nonvolatile Enable input controls the recall function
to the E
AUTOSTORE Output (AS)
AS is an open drain output which, when asserted indi-
cates V
(V
outputs and used as an interrupt input to a microcontroller.
PIN NAMES
V CC SENSE
ASTH
A
I/O
WE
CE
OE
NE
AS
V
V
NC
Symbol
0
CC
SS
–A
). AS may be wire-ORed with multiple open drain
0
CC
2
–I/O
PROM array.
10
has fallen below the AUTOSTORE threshold
7
HIGH SPEED
COLUMN
I/O 0 –I/O 7
SELECT
ARRAY
SRAM
2K x 8
I/OS
&
EEPROM ARRAY
Address Inputs
Data Input/Output
Write Enable
Chip Enable
Output Enable
Nonvolatile Enable
AUTOSTORE Output
+5V
Ground
No Connect
Description
3826 FHD F01
3826 PGM T01