PT7M6836FD2TBE

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PT7M6832-6840

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

Description

The PT7M6832–6840 are microprocessor (µ

P)

supervisory circuits used to monitor low-voltage power

supplies in µ and digital systems. They provide

P

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:

70µ (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s.

s

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 7.5µ makes the PT7M6832–

A

PT7M6840 ideal for use in portable equipment. These

devices are available in 3-pin SOT23 or 4-pin SOT143

packages.

Pad Configuration

PT7M6832

PT7M6833

PT7M6834

1

GND

1

PT7M6832

PT7M6833

PT7M6834

GND

VCC

3

VCC

3

2

RESET (RESET)

2

RESET (RESET)

SOT23-3L

() is for PT7M6833

SC70-3L

() is for PT7M6833

PT7M6835

PT7M6836

PT7M6837

1

GND

RESET

(RESET)

4

1

PT7M6838

PT7M6839

PT7M6840

GND

RESET

(RESET)

4

Applications











Computers

Controllers

Intelligent Instruments

Critical μP and μC Power Monitoring

Portable/Battery-Powered Equipment

2

VCC

MR

3

2

VCC

RESET-IN

3

SOT143-4L

() is for PT7M6836

SOT143-4L

() is for PT7M6839

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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

Name

GND

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

-

2

-

4

RESET

2

-

4

-

RESET

-

-

3

3

MR

3

3

2

2

VCC

PT7M6838- PT7M6840

PT7M6839

PT7M6838/

PT7M6840

3

2

1

-

Name

Description

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.

3

2

1

4

RESET-IN

Vcc

GND

RESET

-

4

RESET

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Ultra Low Voltage Detectors

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Block Diagram

MR (only for PT7M6835/6836/6837)

V

CC

Manual

Reset

Detect

+

-

Reset

Timeout

Period

Reset

Output

RESET /

(RESET)

+

-

V

REF

=444mV

Fig.1

PT7M6832-PT7M6837 Block Diagram

Fig.2

PT7M6838-PT7M6840 Block Diagram

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Ultra Low Voltage Detectors

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Maximum Ratings

Storage Temperature………………………………………… - 65

o

C to +150

o

C

Ambient Temperature with Power Applied....................-40oC to +85oC

Supply Voltage to Ground Potential (V

CC

to GND)………....... - 0.3V to +6.0V

Open-drain RESET, MR... ……………………………………..- 0.3V to +6.0V

RESET-IN, Push-pull RESET and RESET……………

….-0.3V to +6.0V

DC Input/Output Current …………………………………………………20mA

Power Dissipation………………………………………………………245mW

Note:

Stresses greater than those listed under MAXIMUM

RATINGS may cause permanent damage to the

device. This is a stress rating only and functional

operation of the device at these or any other condi-

tions above those indicated in the operational sec-

tions of this specification is not implied. Exposure

to absolute maximum rating conditions for extended

periods may affect reliability.

AC Electrical Characteristics

(V

CC

= +0.9V to +5.5V, unless otherwise noted. Typical values are at T

A

= +25º

C)

Description

Symbol

D0

D1

Reset Active Timeout Period

t

PD

D2

D3

D4

Vcc or RESET-IN to Reset Delay

Propagation Delay(D0 only)

Startup Time(D0 only)

MR Minimum Input Pulse Width

MR Glitch Rejection

MR to Reset Delay

t

P

-

-

-

-

Vcc falling, step signal from

(V

TH

+100mV) to (V

TH

-100mV)

Vcc rising, step signal from

(V

TH

-100mV) to (V

TH

+100mV)

Vcc rising from 0 to 1.1V(t

R

<1µs)

MR driven from Vcc to 0

MR driven from Vcc to 0

MR driven from Vcc to 0

Test Conditions

Min

-

1

20

140

1120

-

-

-

2

-

-

Typ

0.07

1.5

30

210

1680

60

70

150

-

100

500

Max

-

2

40

280

2240

-

-

-

-

-

-

µs

µs

µs

µs

ns

ns

ms

Unit

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Ultra Low Voltage Detectors

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DC Electrical Characteristics

(V

CC

= +0.9V to +5.5V, unless otherwise noted. Typical values are at T

A

= +25º

C)

Description

Sym.

Test Conditions

T

A

= -40º ~+85º PT7M6832/6835/6838,

C

C,

PT7M6834/6837/6840

T

A

= -40º ~+85º PT7M6833/6836/6839

C

C,

T

A

= 0º ~+85º PT7M6833/6836/6839

C

C,

T

A

= -40º ~+85º PT7M6838/6839/6840

C

C,

V

CC

=1.2V, no load , reset not asserted

Supply Current

I

CC

V

CC

=1.8V, no load , reset not asserted

V

CC

=3.6V, no load , reset not asserted

W

V

Reset Threshold

V

TH

I

H (-10º ~ +85º

C

C)

G (0º ~ +85º

C

C)

F*(

0º ~+85º

C

C)

1.5V<=V

CC

<=5.5V, RESET-IN falling from high

to low(25º

C)

1.5V<=V

CC

<=5.5V, RESET-IN rising from low

to high(0º ~85º

C

C)

Min

0.9

0.85

0.75

1.5

-

-

-

1.620

1.530

1.350

1.275

1.080

1.020

Typ

-

-

-

-

7.5

9

16

1.665

1.575

1.388

1.313

1.110

1.050

Max

5.5

5.5

5.5

5.5

13

16

25

1.710

1.620

1.425

1.350

1.140

1.080

V

µA

V

Unit

Operating Voltage Range

V

CC

-2%

-5%

-

0.8×

Vcc

0.8×

Vcc

0.8×

Vcc

0.8×

Vcc

-

-

-

-

-

-

-

0.7×

Vcc

-

-25

-

444

444

70

-

-

-

-

-

-

-

-

-

-

-

-

-

-

0.75

+2%

+5%

-

-

-

-

-

0.2×

Vcc

0.2×

Vcc

0.2×

Vcc

0.2×

Vcc

0.15

0.2

0.3×

Vcc

-

1.0

+25

-

V

V

-

ppm/

℃

RESET-IN Threshold

Reference voltage

temperature coefficient

V

RSTIN

T

C

Reference voltage temperature coefficient,

-40º ~+85º

C

C

V

CC

>=1.1V, I

source

=50µ reset not asserted

A,

V

CC

>=1.5V, I

source

=150µ reset not asserted

A,

V

CC

>=1.0V, I

source

=50µ reset asserted

A,

V

CC

>=1.5V, I

source

=150µ reset asserted

A,

Push-pull RESET

Output High Voltage

V

OH

Push-pull RESET

Output Low Voltage

Push-pull RESET

Output Low Voltage

Open-Drain RESET

Output Low Voltage

MR Input Voltage

Open-Drain RESET

Output Leakage Current

RESET-IN Leakage Current

Reset Threshold Hysteresis

V

IL

V

IH

I

LKG

I

RSTIN

V

HYS

V

OL

V

CC

>=1.0V, I

sink

=80µ reset asserted

A,

V

CC

>=1.5V, I

sink

=200µ reset asserted

A,

V

CC

>=1.1V, I

sink

=80µ reset not asserted

A,

V

CC

>=1.5V, I

sink

=200µ reset not asserted

A,

V

CC

>=1.0V, I

sink

=80µ reset asserted

A,

V

CC

>=1.5V, I

sink

=200µ reset asserted

A,

-

-

V

CC

> V

TH

, reset not asserted

-

-

V

µA

nA

% V

TH

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