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LTC695ISW-3.3#PBF

Description
监控器 开路漏极或开路集电极 1 通道 16-SOIC
Categorysemiconductor    Multi-channel IC (PMIC)   
File Size194KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LTC695ISW-3.3#PBF Overview

监控器 开路漏极或开路集电极 1 通道 16-SOIC

LTC695ISW-3.3#PBF Parametric

Parameter NameAttribute value
category
MakerADI
series-
PackagePipe fittings
typeSimple reset/power-on reset
Voltage - Threshold2.9V
outputOpen drain or open collector
resetHigh effective/low effective
reset timeout最小为 140ms
Operating temperature-40°C ~ 85°C(TA)
Installation typesurface mount type
Package/casing16-SOIC (0.295", 7.50mm wide)
Supplier device packaging16-SOIC
Monitored voltage number1
Basic product numberLTC695
LTC694-3.3/LTC695-3.3
3.3V Microprocessor
Supervisory Circuits
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
DESCRIPTION
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 pro-
tection, 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. Microprocessor
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
timeout period.
Guaranteed Reset Assertion at V
CC
= 1V
Pin Compatible with LTC694/LTC695 for 3.3V Systems
200μA Typical Supply Current
Fast (30ns Typ) Onboard 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
1μA Maximum Standby Current
Voltage Monitor for Power-Fail or
Low-Battery Warning
Thermal Limiting
Performance Specified Over Temperature
APPLICATIONS
n
n
n
n
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3.3V Low Power Systems
Critical μP Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
V
IN
≥ 5V
RESET
Output Voltage
vs Supply Voltage
V
CC
0.1μF
V
OUT
LTC695-3.3
V
BATT
2.4V
CE
IN
CE
OUT
RESET
PFO
WDI
GND
POWER TO
μP
CMOS RAM POWER
0.1μF
μP
SYSTEM
DECODER OUTPUT
RAM
CS
μP
RESET
μP NMI
I/O LINE
100Ω
0.1μF
694/5-3.3 TA01
+
1μF
LT1129-3.3
V
IN
V
OUT
OUT SENSE
SHDN
GND
3.3V
5
+
100μF
RESET
OUTPUT VOLTAGE (V)
4
3
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
2
1
0
0
1
3
4
2
SUPPLY VOLTAGE (V)
5
694/5-3.3 TA02
69453fb
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