X20C05 Datasheet, PDF (2/19 Pages) Xicor Inc. – High Speed AUTOSTORE™ NOVRAM

X20C05
PIN DESCRIPTIONS
Addresses (A₀–A₈)
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/O₀–I/O₇)
Data is written to or read from the X20C05 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
RAM.
FUNCTIONAL DIAGRAM
Nonvolatile Enable (NE)
The Nonvolatile Enable input controls the recall function
to the E²PROM array.
AUTOSTORE Output (AS)
AS is an open drain output which, when asserted indi-
cates V_CC has fallen below the AUTOSTORE threshold
(V_ASTH). AS may be wire-ORed with multiple open drain
outputs and used as an interrupt input to a microcontroller.
PIN NAMES
Symbol
A₀–A₈
I/O0–I/O7
WE
CE
OE
NE
AS
VCC
VSS
NC
Description
Address Inputs
Data Input/Output
Write Enable
Chip Enable
Output Enable
Nonvolatile Enable
AUTOSTORE Output
+5V
Ground
No Connect
3827 PGM T01
AS
VCC SENSE
EEPROM ARRAY
A3–A6
CE
OE
WE
NE
A0–A2
A7–A8
ROW
SELECT
CONTROL
LOGIC
HIGH SPEED
512 x 8
SRAM
ARRAY
COLUMN
SELECT
&
I/OS
I/O0–I/O7
2
3827 FHD F01