LTC699C Linear Technology, LTC699C Datasheet

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LTC699C

Manufacturer Part Number
LTC699C
Description
Microprocessor Supervisory Circuit
Manufacturer
Linear Technology
Datasheet

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+5V
FEATURE
A
TYPICAL
PPLICATI
Guaranteed Reset Assertion at V
1.5mA Maximum Supply Current
SO-8 Packaging
4.65V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms
Minimum External Component Count
Performance Specified Over Temperature
Superior Upgrade for MAX699
Critical P Power Monitoring
Intelligent Instruments
Computers and Controllers
Automotive Systems
0.1µF
V
MICROPROCESSOR RESET AND WATCHDOG TIMING IN
A SINGLE CHIP FOR MICROPROCESSOR SYSTEMS.
A
S
CC
O
PPLICATI
LTC699
GND
U
RESET
WDI
S
500k
O
U
CC
= 1V
0.1µF
µP RESET
I/O LINE
µP POWER
SYSTEM
µP
LTC699 TA1
V CC
D
The LTC699 provides power supply monitoring for
microprocessor-based systems. The features include mi-
croprocessor reset and watchdog timing. Precise internal
voltage reference and comparator circuit monitor the
power supply line. When an out-of-tolerance condition
occurs, the RESET output is forced to active low. In
addition, the RESET output is guaranteed to remain logic
low even with V
An internal watchdog timer is also available, which forces
the RESET output to active low when the watchdog input
is not toggled prior to the time-out period of 1.6 seconds.
The LTC699 is offered in DIP and surface mount packages.
BLOCK
ESCRIPTIO
WDI
1.3V
I D AGRA
CC
Supervisory Circuit
OSC
+
as low as 1V.
C1
TRANSITION
U
DETECTOR
Microprocessor
W
RESET PULSE
GENERATOR
WATCHDOG
TIMER
LTC699
LTC699 BD
RESET
1
GND

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LTC699C Summary of contents

Page 1

FEATURE S Guaranteed Reset Assertion at V 1.5mA Maximum Supply Current SO-8 Packaging 4.65V Precision Voltage Monitor Power OK/Reset Time Delay: 200ms Minimum External Component Count Performance Specified Over Temperature Superior Upgrade for MAX699 O U PPLICATI S A Critical ...

Page 2

... Terminal Voltage V ................................................... –0.3V to 6.0V CC WDI Input .............................. – 0. RESET Output ...................................... – 0. Power Dissipation............................................. 500mW Operating Temperature Range LTC699C .............................................. LTC699I ........................................... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec.)................ 300 C ELECTRICAL C HARA TERISTICS C PARAMETER Operating Voltage Range ...

Page 3

... On power- Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights. but not serviced prior to the time-out period, the reset pulse generator also forces RESET to active low for a mini- mum of 140ms for every time-out period (see Figure 2) ...

Page 4

... L 0.016 – 0.050 0.406 – 1.270 4.801 – 5.004 0° – 8° TYP 3.810 – 3.988 CONDITIONS: PCB MOUNT ON FR4 MATERIAL, STILL AIR COPPER TRACE LT/GP 0192 10K REV 0 LINEAR TECHNOLOGY CORPORATION 1992 1191 ...

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