X25045 Datasheet | Programmable Watchdog Supervisory E2PROM





X25045 PDF File (Datasheet) Download

Part Number X25045
Description Programmable Watchdog Supervisory E2PROM
Manufacture Xicor
Total Page 15 Pages
PDF Download Download X25045 PDF File

Features: APPLICATION NOTES A V A I L A B L E AN11 • AN21 X25043/45 4K X25043/45 Prog rammable Watchdog Supervisory E2PROM DE SCRIPTION 512 x 8 Bit FEATURES • • • • • • • • • • • Programmable Watchdog Timer Low VCC Detection Reset Signal Valid t o VCC = 1V 1MHz Clock Rate 512 X 8 Bits Serial E2PROM —4 Byte Page Mode Low Power CMOS —50µA Standby Current — 3mA Active Current 2.7V To 5.5V Power S upply Block LockTM —Protect 1/4, 1/2 or all of E2PROM Array Built-in Inadver tent Write Protection —Power-Up/Power -Down protection circuitry —Write Lat ch —Write Protect Pin High Reliabilit y —Endurance: 100,000 cycles per byte —Data Retention: 100 Years —ESD pr otection: 2000V on all pins Available P ackages —8-Lead PDlP —8-Lead SOIC 14-Lead TSSOP X25043 = Active LOW RES ET X25045 = Active HIGH RESET The X250 43/45 combines three popular functions, Watchdog Timer, Voltage Supervision, a nd E2PROM in a single package. This combination lowers the system cost and reduces the board space requirements. The W.

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APPLICATION NOTES
AVA I L A B L E
X25043/45AN11 • AN21
4K
X25043/45
512 x 8 Bit
Programmable Watchdog Supervisory E2PROM
FEATURES
Programmable Watchdog Timer
Low VCC Detection
Reset Signal Valid to VCC = 1V
1MHz Clock Rate
512 X 8 Bits Serial E2PROM
—4 Byte Page Mode
Low Power CMOS
—50µA Standby Current
—3mA Active Current
2.7V To 5.5V Power Supply
Block LockTM
—Protect 1/4, 1/2 or all of E2PROM Array
Built-in Inadvertent Write Protection
—Power-Up/Power-Down protection circuitry
—Write Latch
—Write Protect Pin
High Reliability
—Endurance: 100,000 cycles per byte
—Data Retention: 100 Years
—ESD protection: 2000V on all pins
Available Packages
—8-Lead PDlP
—8-Lead SOIC
—14-Lead TSSOP
X25043 = Active LOW RESET
X25045 = Active HIGH RESET
DESCRIPTION
The X25043/45 combines three popular functions,
Watchdog Timer, Voltage Supervision, and E2PROM in
a single package. This combination lowers the system
cost and reduces the board space requirements.
The Watchdog Timer provides an independent protec-
tion system for microcontrollers. During a system failure,
the X25043/45 watchdog will respond with a RESET/
RESET signal after a selectable time-out interval. The
user selects the interval from three preset values. Once
selected, the interval does not change, even after cy-
cling the power.
The system is protected from low voltage conditions by
the X25043/45 low VCC detection circuits. When VCC
drops below the minimum VCC trip point, the system is
reset. Reset is asserted until VCC returns and stabilizes.
The memory portion of the X25043/45 is a CMOS 4096-
bit serial E2PROM, internally organized as 512 X 8. The
X25043/45 features a Serial Peripheral Interface (SPI)
and software protocol allowing operation on a simple
three-wire bus.
The X25043/45 utilizes Xicor’s proprietary Direct Write™
cell, providing a minimum endurance of 100,000 cycles
per byte and a minimum data retention of 100 years.
DIE PHOTOGRAPH
RESET
CONTROL
LOGIC
PROGRAMMABLE
VOLTAGE
SENSOR
SERIAL
INTERFACE
LOGIC
Direct Write™ is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3844-6.5 5/9/96 T4/C2/D2 NS
4K BITS E22PROM
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3844 ILL F01
Characteristics subject to change without notice

                    
                    






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