X20C17 Datasheet, PDF (1/11 Pages) Xicor Inc. – High Speed AUTOSTORE™ NOVRAM

APPLICATION NOTE
AVA I L A B L E
X20C17 ^AN56
16K
X20C17
High Speed AUTOSTORE™ NOVRAM
2K x 8 Bit
FEATURES
• 24-Pin Standard SRAM DIP Pinout
• Fast Access Time: 35ns, 45ns, 55ns
• High Reliability
—Endurance: 1,000,000 Nonvolatile Store
Operations
—Retention: 100 Years Minimum
• AUTOSTORE™ NOVRAM
—Automatically Stores SRAM Data Into the
E²PROM Array When VCC Low Threshold is
Detected
—E²PROM Data Automatically Recalled Into
RAM Upon Power-up
• Low Power CMOS
—Standby: 250µA
• Infinite E²PROM Array Recall, and RAM Read
and Write Cycles
DESCRIPTION
The Xicor X20C17 is a 2K x 8 NOVRAM featuring a high-
speed static RAM overlaid bit-for-bit with a nonvolatile
electrically erasable PROM (E²PROM) and the
AUTOSTORE feature which automatically saves the
RAM contents to E²PROM at power-down. The X20C17
is fabricated with advanced CMOS floating gate technol-
ogy to achieve high speed with low power and wide
power-supply margin. The X20C17 features a compat-
ible JEDEC approved byte-wide memory pinout for
industry standard SRAMs.
The NOVRAM design allows data to be easily trans-
ferred from RAM to E²PROM (store) and E²PROM to
RAM (recall). The store operation is completed in 2.5ms
or less. An automatic array recall operation reloads the
contents of the E²PROM into RAM upon power-up.
Xicor NOVRAMS are designed for unlimited write
operations to RAM, either from the host or recalls from
E²PROM, and a minimum 1,000,000 store operations to
the E²PROM. Data retention is specified to be greater
than 100 years.
PIN CONFIGURATION
PLASTIC
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
VSS
1
24
2
23
3
22
4
21
5
20
6
19
X20C17
7
18
8
17
9
16
10
15
11
14
12
13
VCC
A8
A9
WE
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
2015 ILL F02.1
AUTOSTORE™ NOVRAM is a trademark of Xicor, Inc.
©Xicor, Inc. 1992, 1995 Patents Pending
2015-2.5 8/1/97 T1/C0/D0 SH
1
Characteristics subject to change without notice