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PT7M6840 の電気的特性と機能

PT7M6840のメーカーはPericom Semiconductor Corporationです、この部品の機能は「Ultra Low Voltage Detectors」です。


製品の詳細 ( Datasheet PDF )

部品番号 PT7M6840
部品説明 Ultra Low Voltage Detectors
メーカ Pericom Semiconductor Corporation
ロゴ Pericom Semiconductor Corporation ロゴ 




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PT7M6840 Datasheet, PT7M6840 PDF,ピン配置, 機能
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

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PT7M6840 pdf, ピン配列
PT7M6832-6840
Ultra Low Voltage Detectors
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Block Diagram
MR (only for PT7M6835/6836/6837)
VCC
Manual
Reset
Detect
+
-
Reset
Timeout
Period
Reset
Output
RESET /
(RESET)
-+ VREF=444mV
Fig.1 PT7M6832-PT7M6837 Block Diagram
Fig.2 PT7M6838-PT7M6840 Block Diagram
2013-11-0003
PT0236-6
11/18/13
3


3Pages


PT7M6840 電子部品, 半導体
PT7M6832-6840
Ultra Low Voltage Detectors
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Functional Description
Reset Output
The PT7M6832PT7M6840 assert a reset to prevent code-
execution errors during power-up, power-down, or brownout
conditions. They also assert a reset signal whenever the Vcc
supply voltage falls below a preset threshold (PT7M6832
PT7M6837) or RESET-IN falls below the adjustable threshold
(PT7M6838-PT7M6840), keeping reset asserted for a fixed
timeout delay (Table 2) after Vcc or RESET-IN has risen
above the reset threshold. The PT7M6832/6835/6838 use a
push-pull active-low output, the PT7M6833/6836/6839 have a
push-pull active-high output, and the PT7M6834/6837/ 6840
have an open-drain active- low output stage. Connect a pull-
up resistor on the PT7M6834/6837/ 6840’s RESET output to
any supply between 0 and 6V.
Manual Reset Input
Reset remains asserted while MR is low, and for a fixed
timeout delay after MR returns high. This input has an
internal 20kΩ pull-up resistor, so it can be left open if it is not
used. MR can be driven with CMOS logic level, or with open-
drain/collector outputs. To create a manual reset function,
connect a normally open momentary switch from MR to
ground; external debounce circuitry is not required.
RESET-IN
The PT7M6838/6839/6840 features a RESET-IN input for
monitoring supply voltages down to 0.44V. An external
resistive-divider network can be used to set voltage
monitoring thresholds as shown in Fig.3. As the monitored
voltage falls, the voltage at RESET-IN decreases and asserts a
reset when it falls below the RESET-IN threshold(VRSTIN).
The low-leakage current at RESET-IN allows for relatively
large-value resistors to be used, which reduce power
consumption. For example, for a 0.6V monitored trip level, if
R2 = 200kΩ, then R1 = 70.3kΩ.
Note: The minimum Vcc of 1.3V is required to guarantee the
RESET-IN threshold accuracy.
Vmonitored
R1
R2
PT7M6838
/6839
/6840
VCC
RESET-IN
RESET
(RESET)
() is for PT7M6839
R1=R2(Vmonitored/VREF-1)
VREF=444mV
Fig.3 External setting of adjustable threshold
2013-11-0003
PT0236-6
11/18/13
6

6 Page



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部品番号部品説明メーカ
PT7M6840

Ultra Low Voltage Detectors

Pericom Semiconductor Corporation
Pericom Semiconductor Corporation


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