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LTC694-3.3 Datasheet

  • LTC694-3.3

  • 3.3V Microprocessor Supervisory Circuits

  • 16頁

  • LINER

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LTC694-3.3/LTC695-3.3
3.3V Microprocessor
Supervisory Circuits
FEATURES
s
s
s
DESCRIPTIO
廬
s
s
s
s
s
s
s
s
s
s
UL Recognized
File # E145770
Guaranteed
Reset Assertion at V
CC
= 1V
Pin Compatible with LTC694/LTC695
for 3.3V Systems
200碌A(chǔ) Typical Supply Current
Fast (30ns Typ) On-Board Gating of
RAM Chip Enable Signals
SO-8 and S16 Packages
2.90V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms or Adjustable
Minimum External Component Count
1碌A(chǔ) Maximum Standby Current
Voltage Monitor for Power-Fail or
Low-Battery Warning
Thermal Limiting
Performance Specified Over Temperature
The LTC
廬
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 3碌W 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 V
CC
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.
APPLICATIO S
s
s
s
s
s
3.3V Low Power Systems
Critical
碌P
Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
TYPICAL APPLICATIO
V
IN
鈮?/div>
5V
+
1碌F
LT1129-3.3
V
IN
V
OUT
OUT SENSE
SHDN
GND
3.3V
+
100碌F
0.1碌F
V
CC
V
OUT
LTC695-3.3
V
BATT
CE IN
CE OUT
RESET
PFO
WDI
GND
RESET OUTPUT VOLTAGE (V)
2.4V
51k
PFI
18k
MICROPROCESSOR RESET, BATTERY BACK-UP,
RAM WRITE PROTECTION, POWER WARNING AND
WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR 3.3V MICROPROCESSOR SYSTEM
POWER TO
碌P
CMOS RAM POWER
0.1碌F
碌P
SYSTEM
DECODER OUTPUT
RAM CS
碌P
RESET
碌P
NMI
I/O LINE
100鈩?/div>
0.1碌F
694/5-3.3 TA01
U
RESET Output Voltage vs
Supply Voltage
5
4
3
2
1
0
0
1
3
4
2
SUPPLY VOLTAGE (V)
5
694/5-3.3 TA02
U
U
1

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