X20C05 Datasheet, PDF (1/19 Pages) Xicor Inc. – High Speed AUTOSTORE™ NOVRAM

APPLICATION NOTE
AVA I L A B L E
X20C05 ^AN56
4K
X20C05
High Speed AUTOSTORE™ NOVRAM
512 x 8
FEATURES
• Fast Access Time: 35ns, 45ns, 55ns
• High Reliability
—Endurance: 1,000,000 Nonvolatile Store
Operations
—Retention: 100 Years Minimum
• Power-on Recall
—E²PROM Data Automatically Recalled Into
SRAM Upon Power-up
• AUTOSTORE™ NOVRAM
—User Enabled Option
—Automatically Stores SRAM Data Into the
E²PROM Array When V_CC Low Threshold is
Detected
—Open Drain AUTOSTORE Status Output Pin
• Software Data Protection
—Locks Out Inadvertent Store Operations
• Low Power CMOS
—Standby: 250µA
• Infinite E²PROM Array Recall, and RAM Read
and Write Cycles
• Upward compatible with X20C16 (16K)
DESCRIPTION
The Xicor X20C05 is a 512 x 8 NOVRAM featuring a
high-speed static RAM overlaid bit-for-bit with a non-
volatile electrically erasable PROM (E²PROM). The
X20C05 is fabricated with advanced CMOS floating
gate technology to achieve high speed with low power
and wide power-supply margin. The X20C05 features
the JEDEC approved pinout for byte-wide memories,
compatible with industry standard RAMs, ROMs,
EPROMs, and E²PROMs.
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 5ms or
less and the recall operation is completed in 5µs or less.
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
CERDIP
NE
NC
7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
V
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8 ^X20C05 21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
WE
AS
A8
NC
NC
OE
NC
CE
I/O7
I/O6
I/O5
I/O4
I/O3
3827 FHD F02
AUTOSTORE™ NOVRAM is a trademark of Xicor, Inc.
©Xicor, Inc. 1991 - 1997 Patents Pending
3827-2.7 7/31/97 T4/C0/D0 SH
LCC
PLCC
4 3 2 1 32 31 30
A6 5
29 A8
A5 6
28 NC
A4 7
27 NC
A3 8
A2 9
A1 10
X20C05
(TOP VIEW)
26 NC
25 OE
24 NC
A0 11
23 CE
NC 12
22 I/O7
I/O0 13
21 I/O6
14 15 16 17 18 19 20
3827 FHD F03
1
Characteristics subject to change without notice