Document
Datasheet
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
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:
5μA(Typ)
Operating Temperature Range: -40°C to +105°C
Packages
MSOP8
W (Typ) x D (Typ) x H (Max)
2.90mm x 4.00mm x 0.90mm
Applications
All devices using microcontrollers or DSP, including vehicle equipment, displays, servers, DVD players, and telephone systems
SOP8
5.00mm x 6.20mm x 1.71mm
Ordering Information
B D3 7 A 1 9 F VM
-
TR
Part Number
37A:WDT H Active 87A:WDT L Active 99A:WDT H Active
Detection Voltage Package
19:1.9V 28:2.8V 29:2.9V 34:3.4V 41:4.1V
FVM : MSOP8 F : SOP8
Packaging and forming specification
TR: Embossed tape and reel E2: Embossed tape and reel
Lineup
Detection voltage (Typ) 1.9V 4.1V 2.8V 2.9V 3.4V 4.1V 4.1V
INH logic H: Active H: Active L: Active L: Active L: Active L: Active H: Active
Package
MSOP8
Reel of 3000
MSOP8
Reel of 3000
MSOP8
Reel of 3000
MSOP8
Reel of 3000
MSOP8
Reel of 3000
MSOP8
Reel of 3000
SOP8
Reel of 2500
Orderable Part Number BD37A19FVM-TR BD37A41FVM-TR BD87A28FVM-TR BD87A29FVM-TR BD87A34FVM-TR BD87A41FVM-TR BD99A41F-E2
○Product structure:Silicon monolithic integrated circuit
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○This product has not designed protection against radioactive rays
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TSZ02201-0G1G0AN00130-1-2 05.Sep.2014 Rev.003
BD37Axx Series BD87Axx Series BD99A41F
Pin Configurations
MSOP8 (TOP VIEW)
8765
SOP8 (TOP VIEW)
8765
Datasheet
1234
1234
Figure 1. Pin Configurations
Pin Descriptions
No.
Pin name
BD37AxxFVM Function
1 CLK Clock input from microcontroller
2
CT
Reset delay time setting capacitor connection pin
3 CTW WDT time setting capacitor connection pin
No.
Pin name
BD87AxxFVM / BD99A41F Function
1 CTW WDT time setting capacitor connection pin
2
CT
Reset delay time setting capacitor connection pin
3 CLK Clock input from microcontroller
4 VDD Power supply pin
4 GND GND pin
5 N.C. NC pin
6 GND GND pin
7
INH
WDT ON/OFF setting pin INH=H/L:WDT=ON/OFF
8 RESET Reset output pin
5 VDD Power supply pin
WDT ON/OFF setting pin 6 INH IN.