ADM8616_15 Datasheet, PDF (1/12 Pages) Analog Devices – Low Voltage Supervisory Circuits with Watchdog in 4-Lead SC70

FEATURES
Precision 1.8 V to 5 V power supply monitoring
9 RESET threshold options
1.58 V to 4.63 V
4 RESET timeout options
1 ms, 20 ms, 140 ms, 1120 ms
3 watchdog timeout options
6.3 ms, 102 ms, 1.6 sec
RESET output stages
Push-pull active-low (ADM8616)
Open-drain active-low (ADM8617)
Low power consumption (5 μA)
Guaranteed reset output valid to VCC = 1 V
Power supply glitch immunity
Specified over −40°C to +85°C temperature range
4-lead SC70 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
Low Voltage Supervisory Circuits
with Watchdog in 4-Lead SC70
ADM8616/ADM8617
FUNCTIONAL BLOCK DIAGRAM
ADM8616
V_CC
V_REF
RESET
GENERATOR
V_CC
RESET
WATCHDOG
DETECTOR
GND
WDI
Figure 1.
GENERAL DESCRIPTION
The ADM8616/ADM8617 are supervisory circuits that monitor
power supply voltage levels and code execution integrity in
microprocessor-based systems. A power-on reset signal is
generated when the supply voltage rises to a preset threshold
level. The ADM8616/ADM8617 have an on-chip watchdog
timer that can reset the microprocessor if it fails to strobe
within a preset timeout period.
Each part is available in the following nine reset threshold
options: 1.58 V, 1.67 V, 2.19 V, 2.32 V, 2.63 V, 2.93 V, 3.08 V,
4.38 V, and 4.63 V. There are four reset timeout options: 1 ms,
20 ms, 140 ms, and 1120 ms. There are also three possible
watchdog timeouts available: 6.3 ms, 102 ms, and 1.6 sec.
The parts differ in terms of reset output configuration. The
ADM8616 is active-low with a push-pull output, while the
ADM8617 is active-low with an open-drain output.
The ADM8616/ADM8617 are available in 4-lead SC70 packages
and typically consume only 5 μA, making them suitable for use
in low power, portable applications.
Rev. B
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