PT7M6832-6840
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Ultra Low Voltage Detectors
Features
Factory-Set Reset Threshold Voltages for Nominal
Supplies from 1.2V to 1.8V
Low power consumption : Typ 7.5μA
Five different timeout periods available: 70μs(voltage
detector), 1.5ms, 30ms, 210ms and 1.68s
Output configuration: Push-pull RESET , push-pull
RESET or open-drain RESET
Guaranteed reset valid to Vcc: 0.9V--active low,
0.85V--active high
Detect voltage accuracy: 1.5%
Adjustable threshold reset-in option
Immune to short negative Vcc transients
Small SOT23-3L, SC70-3L or SOT143-4L packages
Pad Configuration
PT7M6832
PT7M6833
PT7M6834
PT7M6832
PT7M6833
PT7M6834
1 GND
1 GND
VCC 3
VCC 3
2 RESET (RESET)
SOT23-3L
() is for PT7M6833
PT7M6835
PT7M6836
PT7M6837
1 GND
RESET
(RESET)
4
2 RESET (RESET)
SC70-3L
() is for PT7M6833
PT7M6838
PT7M6839
PT7M6840
1 GND
RESET
(RESET)
4
2 VCC
MR 3
2 VCC RESET-IN 3
SOT143-4L
() is for PT7M6836
SOT143-4L
() is for PT7M6839
Description
The PT7M6832–6840 are microprocessor (µP)
supervisory circuits used to monitor low-voltage power
supplies in µP and digital systems. They provide
excellent circuit reliability and low cost by eliminating
external components and adjustments when used with
+1.2V to +1.8V powered circuits.
These devices assert a reset signal whenever the VCC
supply voltage declines below a preset threshold or
whenever manual reset (MR) is asserted. Reset remains
asserted for a fixed timeout delay after VCC has risen
above the reset threshold or when manual reset is
deasserted. Five different timeout periods are available:
70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The PT7M6832/PT7M6835/PT7M6838 have a push-
pull active-low reset output (RESET). The PT7M6833/
PT7M6836/PT7M6839 have a push-pull active-high
reset output (RESET) and the PT7M 6834/ PT7M 6837/
PT7M 6840 have an open-drain active-low reset output
(RESET). The open-drain active-low reset output
requires a pull-up resistor that can be connected to a
voltage higher than VCC.
The PT7M6835/PT7M6836/PT7M6837 feature a
debounced manual reset input (MR), while the
PT7M6838/PT7M6839/PT7M6840 provide a RESET-
IN input allowing the user to externally adjust the reset
threshold. The reset comparator is designed to ignore
fast transients on VCC.
Low supply current of 7.5µA makes the PT7M6832–
PT7M6840 ideal for use in portable equipment. These
devices are available in 3-pin SOT23 or 4-pin SOT143
packages.
Applications
Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
Portable/Battery-Powered Equipment
2013-11-0003
PT0236-6
11/18/13
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