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LTC694C-3.3 fiches techniques PDF

Linear Technology - 3.3V Microprocessor Supervisory Circuits

Numéro de référence LTC694C-3.3
Description 3.3V Microprocessor Supervisory Circuits
Fabricant Linear Technology 
Logo Linear Technology 





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LTC694C-3.3 fiche technique
FEATURES
s UL Recognized ® File # E145770
s Guaranteed Reset Assertion at VCC = 1V
s Pin Compatible with LTC694/LTC695
for 3.3V Systems
s 200µA Typical Supply Current
s Fast (30ns Typ) On-Board Gating of
RAM Chip Enable Signals
s SO-8 and S16 Packages
s 2.90V Precision Voltage Monitor
s Power OK/Reset Time Delay: 200ms or Adjustable
s Minimum External Component Count
s 1µA Maximum Standby Current
s Voltage Monitor for Power-Fail or
Low-Battery Warning
s Thermal Limiting
s Performance Specified Over Temperature
U
APPLICATIO S
s 3.3V Low Power Systems
s Critical µP Power Monitoring
s Intelligent Instruments
s Battery-Powered Computers and Controllers
s Automotive Systems
LTC694-3.3/LTC695-3.3
3.3V Microprocessor
Supervisory Circuits
DESCRIPTIO
The LTC®694-3.3/LTC695-3.3 provide complete 3.3V
power supply monitoring and battery control functions.
These include power-on reset, battery back-up, RAM write
protection, power failure warning and watchdog timing.
The devices are pin compatible upgrades of the LTC694/
LTC695 that are optimized for 3.3V systems. Operating
power consumption has been reduced to 0.6mW (typical)
and 3µW maximum in battery back-up mode. Micropro-
cessor reset and memory write protection are provided
when the supply falls below 2.9V. The RESET output is
guaranteed to remain logic low with VCC as low as 1V.
The LTC694-3.3/LTC695-3.3 power the active RAMs with
a charge pumped NMOS power switch to achieve low
dropout and low supply current. When primary power is
lost, auxiliary power, connected to the battery input pin,
powers the RAMs in standby through an efficient PMOS
switch.
For an early warning of impending power failure, the
LTC694-3.3/LTC695-3.3 provide an internal comparator
with a user-defined threshold. An internal watchdog timer
is also available, which forces the reset pins to active
states when the watchdog input is not toggled prior to a
preset time-out period.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN 5V
+
51k
18k
LT1129-3.3
VIN VOUT
1µF OUT SENSE
3.3V
+
100µF
VCC VOUT
0.1µF LTC695-3.3
SHDN
GND
VBATT
2.4V
CE IN
CE OUT
RESET
PFO
PFI GND WDI
MICROPROCESSOR RESET, BATTERY BACK-UP,
RAM WRITE PROTECTION, POWER WARNING AND
WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR 3.3V MICROPROCESSOR SYSTEM
0.1µF
POWER TO µP
CMOS RAM POWER
µP
SYSTEM
DECODER OUTPUT
RAM CS
µP RESET
µP NMI
I/O LINE
100
0.1µF
694/5-3.3 TA01
RESET Output Voltage vs
Supply Voltage
5
4
3
2
1
0
01 2 345
SUPPLY VOLTAGE (V)
694/5-3.3 TA02
1

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