X25401P Datasheet PDF - Xicor
| Part Number | X25401P | |
| Description | SPI Serial AUTOSTORE NOVRAM | |
| Manufacturers | Xicor | |
| Logo |  |
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APPLICATION NOTE
AVA I L A B L E
X25401
AN56
256 Bit
X25401
SPI Serial AUTOSTORE™ NOVRAM
16 x 16 Bit
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: 50µA
• 8-Lead PDIP and 8-Lead SOIC Packages
• High Reliability
—Store Cycles: 1,000,000
—Data Retention: 100 Years
FUNCTIONAL DIAGRAM
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 2µs 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.
NONVOLATILE
E2PROM
ROW
DECODE
STATIC
RAM
256-BIT
CONTROL
LOGIC
RECALL (6)
AS (7)
CS (1)
SI (3)
SCK (2)
INSTRUCTION
REGISTER
INSTRUCTION
DECODE
COLUMN
DECODE
4-BIT
COUNTER
AUTOSTORE™ NOVRAM is a trademark of Xicor, Inc.
COPS is a trademark of National Semiconductor Corp.
© Xicor, Inc. 1992, 1995, 1996 Patents Pending
2051-1.5 8/1/97 T0/C0/D2 SH
1
SO (4)
2051 FHD F01
Characteristics subject to change without notice
|
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X25401
Figure 1. RAM Read
CS
SCK
1 2 3 4 5 6 7 8 9 10 11 12 22 23 24
SI 1 A A A A 1 1 X*
HIGH Z
SO
*Bit 8 of Read Instructions is Don’t Care
Figure 2. RAM Write
CS
D0 D1 D2 D3 D13 D14 D15 D0
2051 FHD F09.1
SK 1 2 3 4 5 6 7 8 9 10 11 21 22 23 24
DI 1 A A A A 0 1 1 D0 D1 D2 D12 D13 D14 D15
Figure 3. Non-Data Operations
2051 FHD F10.1
CS
SCK
12345678
SI 1 X X X X I2 I1 I0
2051 FHD F11.1
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for X25401P electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ X25401P.PDF Datasheet ] | |
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