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X25401PI データシート(PDF) 1 Page - Xicor Inc.

部品番号 X25401PI
部品情報  SPI Serial AUTOSTORE??NOVRAM
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メーカー  XICOR [Xicor Inc.]
ホームページ  http://www.xicor.com
Logo XICOR - Xicor Inc.

X25401PI データシート(HTML) 1 Page - Xicor Inc.

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X25401
1
SPI Serial AUTOSTORE™ NOVRAM
© Xicor, Inc. 1992, 1995, 1996 Patents Pending
Characteristics subject to change without notice
2051-1.5 8/1/97 T0/C0/D2 SH
DESCRIPTION
The Xicor X25401 is a serial 256 bit NOVRAM featuring
a static RAM configured 16 x 16, overlaid bit-by-bit with
a nonvolatile E2PROM array. The X25401 features a
Serial Peripheral Interface (SPI) and software protocol
allowing operation on a simple three-wire bus. The bus
signals are a clock input (SCK) plus separate data in (SI)
and data out (SO) lines. Access to the device is con-
trolled through a chip select (
CS) input, allowing any
number of devices to share the same bus.
The Xicor NOVRAM design allows data to be transferred
between the two memory arrays by means of software
commands or external hardware inputs. A store opera-
tion (RAM data to E2PROM) is completed in 5ms or less
and a recall operation (E2PROM data to RAM) is com-
pleted in 2
µs or less.
The X25401 also includes the AUTOSTORE feature, a
user selectable feature that automatically performs a
store operation when VCC falls below a preset threshold.
Xicor NOVRAMs are designed for unlimited write opera-
tions to RAM, either from the host or recalls from E2PROM
and a minimum 1,000,000 store operations. Inherent data
retention is specified to be greater than 100 years.
FEATURES
1MHz Clock Rate
AUTOSTORE™ NOVRAM
—Automatically Performs a Store Operation
Upon Loss of VCC
Single 5 Volt Supply
Ideal for use with Single Chip Microcomputers
—Minimum I/O Interface
—SPI Mode (0,0 & 1,1) Serial Port Compatible
—Easily Interfaced to Microcontroller Ports
Software and Hardware Control of Nonvolatile
Functions
Auto Recall on Power-Up
TTL and CMOS Compatible
Low Power Dissipation
—Active Current: 10mA
—Standby Current: 50
µA
8-Lead PDIP and 8-Lead SOIC Packages
High Reliability
—Store Cycles: 1,000,000
—Data Retention: 100 Years
256 Bit
X25401
16 x 16 Bit
AUTOSTORE™ NOVRAM is a trademark of Xicor, Inc.
COPS is a trademark of National Semiconductor Corp.
FUNCTIONAL DIAGRAM
NONVOLATILE
E
2
PROM
CONTROL
LOGIC
COLUMN
DECODE
ROW
DECODE
4-BIT
COUNTER
INSTRUCTION
DECODE
INSTRUCTION
REGISTER
CS (1)
SI (3)
SCK (2)
SO (4)
RECALL (6)
AS (7)
STATIC
RAM
256-BIT
2051 FHD F01
APPLICATION NOTE
A V AILABLE
AN56


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