X5643 Datasheet: CPU Supervisor





X5643 CPU Supervisor Datasheet

Part Number X5643
Description CPU Supervisor
Manufacture Xicor
Total Page 19 Pages
PDF Download Download X5643 Datasheet PDF

Features: Replaces X25643/X25645 X5643/X5645 CPU Supervisor with 64Kbit SPI EEPROM FEA TURES • Selectable watchdog timer • Low VCC detection and reset assertion —Five standard reset threshold voltag es —Re-program low VCC reset threshol d voltage using special programming seq uence —Reset signal valid to VCC = 1V • Determine watchdog or low voltage reset with a volatile flag bit • Lon g battery life with low power consumpti on —<50µA max standby current, watch dog on —<1µA max standby current, wa tchdog off —<400µA max active curren t during read • 64Kbits of EEPROM • Built-in inadvertent write protection —Power-up/power-down protection circu itry —Protect 0, 1/4, 1/2 or all of E EPROM array with Block Lock™ protecti on —In circuit programmable ROM mode • 2MHz SPI interface modes (0,0 & 1,1 ) • Minimize EEPROM programming time —32-byte page write mode —Self-time d write cycle —5ms write cycle time ( typical) • 2.7V to 5.5V and 4.5V to 5.5V power supply operati.

Keywords: X5643, datasheet, pdf, Xicor, CPU, Supervisor, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute, Equivalent

Replaces X25643/X25645
X5643/X5645
CPU Supervisor with 64Kbit SPI EEPROM
FEATURES
• Selectable watchdog timer
• Low VCC detection and reset assertion
—Five standard reset threshold voltages
—Re-program low VCC reset threshold voltage
using special programming sequence
—Reset signal valid to VCC = 1V
• Determine watchdog or low voltage reset with a
volatile flag bit
• Long battery life with low power consumption
—<50µA max standby current, watchdog on
—<1µA max standby current, watchdog off
—<400µA max active current during read
• 64Kbits of EEPROM
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
Block Lockprotection
—In circuit programmable ROM mode
• 2MHz SPI interface modes (0,0 & 1,1)
• Minimize EEPROM programming time
—32-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• 2.7V to 5.5V and 4.5V to 5.5V power supply
operation
• Available packages
—8-lead PDIP, 14-lead SOIC
BLOCK DIAGRAM
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’s low VCC detection circuitry protects the
user’s system from low voltage conditions, resetting
the system when VCC falls below the minimum VCC
trip point. RESET/RESET is asserted until VCC returns
to proper operating level and stabilizes. Five industry
standard VTRIP thresholds are available, however,
Xicor’s unique circuits allow the threshold to be repro-
grammed to meet custom requirements or to fine-tune
the threshold for applications requiring higher precision.
WP
SI
SO
SCK
CS/WDI
VCC
Watchdog Transition
Detector
Protect Logic
Data
Register
Command
Decode &
Control
Logic
Status
Register
16Kbits
16Kbits
VCC Threshold
Reset logic
32Kbits
VTRIP
+
-
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
Power On and
Low Voltage
Reset
Generation
RESET/RESET
X5643 = RESET
X5645 = RESET
REV 1.1.1 3/5/01
www.xicor.com
Characteristics subject to change without notice. 1 of 19

                    
                    






Index : 0  1  2  3   4  5  6  7   8  9  A  B   C  D  E  F   G  H  I  J   K  L  M  N   O  P  Q  R   S  T  U  V   W  X  Y  Z
@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)