Voltage Detectors

Voltage Detector ICs with Watchdog Timer

BD37Axx Series

BD87Axx Series

BD99A41F

General Description

The BD37A19FVM, BD37A41FVM, BD87A28FVM,

BD87A29FVM,

BD87A34FVM,

BD87A41FVM

and

BD99A41F are watchdog timer reset ICs. It delivers a

high precision detection voltage of

±1.5% and a

super-low current consumption of 5 µA (Typ). It can be

used in a wide range of electronic devices to monitor

power supply voltages and in system operation to

prevent runaway operation.

Features

 Built-in Watchdog Timer

 Reset delay time can be set with the CT pin's

external capacitance

 Watchdog timer monitor time and reset time can be

set with the CTW pin's external capacitance.

 Output Circuit Type: N-Channel Open Drain

Applications

All devices using microcontrollers or DSP, including

vehicle equipment, displays, servers, DVD players,

and telephone systems

Key Specifications

 RESET Power Supply Voltage Range: 1.0V to 10V

 WDT Power Supply Voltage Range:

2.5V to 10V

 High Precision Detection Voltage:

(Ta = 25°C)

±1.5%

(Ta =

−40°C to 105°C)

±2.5%

 Super-Low Current Consumption:

5

μA(Typ)

 Operating Temperature Range:

-40°C to +105°C

Packages

W (Typ) x D (Typ) x H (Max)

 MSOP8

2.90mm x 4.00mm x 0.90mm

 SOP8

5.00mm x 6.20mm x 1.71mm

Ordering Information

B

D

3

7

A

1

9

F

V

M

-

T R

Part Number

37A：WDT H Active

87A：WDT L Active

99A：WDT H Active

Detection Voltage

19：1.9V

28：2.8V

29：2.9V

34：3.4V

41：4.1V

Package

FVM : MSOP8

F

: SOP8

Packaging and forming specification

TR: Embossed tape and reel

E2: Embossed tape and reel

Lineup

Detection voltage (Typ)

INH logic

Package

Orderable

Part Number

1.9V

H: Active

MSOP8

Reel of 3000

BD37A19FVM-TR

4.1V

H: Active

MSOP8

Reel of 3000

BD37A41FVM-TR

2.8V

L: Active

MSOP8

Reel of 3000

BD87A28FVM-TR

2.9V

L: Active

MSOP8

Reel of 3000

BD87A29FVM-TR

3.4V

L: Active

MSOP8

Reel of 3000

BD87A34FVM-TR

4.1V

L: Active

MSOP8

Reel of 3000

BD87A41FVM-TR

4.1V

H: Active

SOP8

Reel of 2500

BD99A41F-E2

○Product structure：Silicon monolithic integrated circuit ○This product has not designed protection against radioactive rays

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TSZ02201-0G1G0AN00130-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

05.Sep.2014 Rev.003

TSZ22111・14・001

www.rohm.com

Datasheet