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X5645S14-2.7A Datasheet

  • X5645S14-2.7A

  • CPU Supervisor with 64Kbit SPI EEPROM

  • 19頁

  • INTERSIL   INTERSIL

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廬
X5643, X5645
(Replaces X25643, X25645)
Data Sheet
July 18, 2005
FN8135.1
CPU Supervisor with 64Kbit SPI EEPROM
FEATURES
鈥?Selectable watchdog timer
鈥?Low V
CC
detection and reset assertion
鈥擣ive standard reset threshold voltages
鈥擱e-program low V
CC
reset threshold voltage
using special programming sequence
鈥擱eset signal valid to V
CC
= 1V
鈥?Determine watchdog or low voltage reset with a
volatile flag bit
鈥?Long battery life with low power consumption
鈥?lt;50碌A max standby current, watchdog on
鈥?lt;1碌A max standby current, watchdog off
鈥?lt;400碌A max active current during read
鈥?64Kbits of EEPROM
鈥?Built-in inadvertent write protection
鈥擯ower-up/power-down protection circuitry
鈥擯rotect 0, 1/4, 1/2 or all of EEPROM array with
Block Lock
鈩?/div>
protection
鈥擨n circuit programmable ROM mode
鈥?2MHz SPI interface modes (0,0 & 1,1)
鈥?Minimize EEPROM programming time
鈥?2-byte page write mode
鈥擲elf-timed write cycle
鈥?ms write cycle time (typical)
鈥?2.7V to 5.5V and 4.5V to 5.5V power supply
operation
鈥?Available packages
鈥?-lead PDIP, 14-lead SOIC
BLOCK DIAGRAM
Watchdog Transition
Detector
WP
SI
SO
SCK
CS/WDI
Data
Register
Command
Decode &
Control
Logic
V
CC
Threshold
Reset logic
Protect Logic
DESCRIPTION
These devices combine four popular functions, Power-
on Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Block Lock Protect Serial EEPROM
Memory in one package. This combination lowers sys-
tem cost, reduces board space requirements, and
increases reliability.
Applying power to the device activates the power-on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcon-
troller fails to restart a timer within a selectable time out
interval, the device activates the RESET/RESET signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even after
cycling the power.
The device鈥檚 low V
CC
detection circuitry protects the
user鈥檚 system from low voltage conditions, resetting
the system when V
CC
falls below the minimum V
CC
trip point. RESET/RESET is asserted until V
CC
returns
to proper operating level and stabilizes. Five industry
standard V
TRIP
thresholds are available, however,
Intersil鈥檚 unique circuits allow the threshold to be repro-
grammed to meet custom requirements or to fine-tune
the threshold for applications requiring higher precision.
Watchdog
Timer Reset
RESET/RESET
Status
Register
EEPROM Array
16Kbits
16Kbits
32Kbits
Reset &
Watchdog
Timebase
X5643 = RESET
X5645 = RESET
V
CC
V
TRIP
+
-
Power-on and
Low Voltage
Reset
Generation
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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    CPU Supervisor with 64Kbit SPI EEPROM
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    CPU Supervisor with 64Kbit SPI EEPROM
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    CPU Supervisor with 64Kbit SPI EEPROM
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    CPU Supervisor with 64Kbit SPI EEPROM
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    CPU Supervisor with 64Kbit SPI EEPROM
    XICOR
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    CPU Supervisor with 64Kbit SPI EEPROM
    XICOR [Xic...
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    CPU Supervisor with 64Kbit SPI EEPROM
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    CPU Supervisor with 64Kbit SPI EEPROM
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