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Pericom Semiconductor Corporation

PT7M6833 Datasheet Preview

PT7M6833 Datasheet

Ultra Low Voltage Detectors

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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 PT7M68326840 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
1




Pericom Semiconductor Corporation

PT7M6833 Datasheet Preview

PT7M6833 Datasheet

Ultra Low Voltage Detectors

No Preview Available !

PT7M6832-6840
Ultra Low Voltage Detectors
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Pin Description
PT7M6832- PT7M6837
PT7M6833
SOT23-3
SC70-3
1
PT7M6832/
PT7M6834
SOT23-3
SC70-3
1
PT7M6836
1
PT7M6835/
PT7M6837
1
-2 - 4
2- 4 -
-- 33
3322
Name
GND
RESET
RESET
MR
VCC
Description
Ground
Reset Output, Open-Drain or Push-Pull, Active-Low.
/RESET changes from HIGH to LOW when Vcc
drops below the selected reset threshold or /MR is
pulled low. /RESET remains LOW for the reset
timeout period after Vcc exceeds the device reset
threshold and /MR is released high.
Reset Output, Push-Pull, Active-High. RESET
changes from LOW to HIGH when the Vcc input
drops below the selected reset threshold or /MR is
pulled low. RESET remains HIGH for the reset
timeout period after Vcc exceeds the device reset
threshold and /MR is released high.
Active-Low Manual Reset Input. Internal 20kΩ pull-
up to Vcc. Pull LOW to force a reset. Reset remains
active as long as MR is LOW and for the reset timeout
period after MR goes HIGH. Leave unconnected or
connect to Vcc if unused
Supply Voltage and Monitored Supply
PT7M6838- PT7M6840
PT7M6839
PT7M6838/
PT7M6840
33
22
11
4-
-4
Name
Description
RESET-IN
Vcc
GND
RESET
RESET
Adjustable Reset Threshold Input. High-impedance input for reset comparator.
Connect this pin to an external resistive-divider network to set the reset threshold
voltage; the typical threshold is 0.44V. Reset is asserted when RESET-IN is below
the threshold (VCC is not monitored).
Supply Voltage (1.3V to 5.5V)
Ground
Reset Output, Push-Pull, Active-High. RESET changes from LOW to HIGH when
the RESET-IN input drops below the typical reset threshold (0.44V). RESET
remains HIGH for the reset timeout period after RESET-IN exceeds the reset
threshold.
Reset Output, Open-Drain or Push-Pull, Active-Low. /RESET changes from HIGH
to LOW when RESET-IN drops below the typical reset threshold (0.44V). /RESET
remains LOW for the reset timeout period after RESET-IN exceeds the reset
threshold.
2013-11-0003
PT0236-6
11/18/13
2


Part Number PT7M6833
Description Ultra Low Voltage Detectors
Maker Pericom Semiconductor Corporation
Total Page 12 Pages
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