New Japan Radio (NJR) developed new System Reset ICs NJU2103A, NJU2103B and another System Reset IC NJU2102A with built-in Watch Dog Timer. They have moved into mass production.

General Description
NJR developed 2 types of System Reset ICs for various power supply voltage monitoring circuits of electrical equipment by new application of micro process and original circuit technology, instead of NJM2103, NJM2012, and they have moved into mass production. One type is System Reset ICs NJU2103A, NJU2103B that can monitor power supply voltage and any voltage as power supply voltage monitoring circuit. Another type is System Reset IC NJU2102A that has built-in Watch Dog Timer and can provide various microcomputer systems with fail-safe function.

The characteristics of the NJU2103A, NJU2103B and NJU2102A are improved. Example, the voltage detection accuracy reaches 1%, the power consumptions are reduced by half compared with the previous products. By improving the voltage detection accuracy of the reset IC, it is possible to set the voltage near the detection voltage and realize the detection voltage high precision for electrical equipment. Long battery life can be achieved with low power and the above feature.

Features

NJU2103A
>>It is possible to replace NJM2103 directly (DMP8, DIP8 package)
>>It can detect 4.2V±1.0% power supply voltage, and any voltage（VSBdetection voltage is 1.22V±1.0％）
>>Low consumption current is 280㎂ typ.

NJU2103B
>>Because the VSBdetection voltage and the VSCdetection voltage are matched with MB3771, it is suitable to replace MB3771.※1
>>It can detect 4.2V±1.0% power supply voltage, and any voltage（VSBdetection voltage is 1.23V±1.0％）
>>Low consumption current is 280㎂ typ.

NJU2102A
>>It is possible to replace NJM2102 directly.
>>Because the detection voltage and various set times are matched with MB3773, it is suitable to replace MB3773.※1
>>It can detect 4.2V±1.0% power supply voltage
>>Built-in Watch Dog Timer
※1Solder pad dimensions of package are different.

Characteristic Improvement
By the application of micro process and original circuit technology, we improve various product characteristics such as high precision, low power and miniaturization. It contributes to the reliability improvement of power supply monitoring systems in the customer applications such as microcomputer monitoring systems.

Functions	Previous Products	New Products
VSADetection Voltage	4.2V±2.5％（NJM2103）	4.2V±1.0％（NJU2103A/B）
Power supply Current	650㎂（NJM2102）	320㎂（NJU2102A）
Package	DMP8,DIP8（NJM2103）	DMP8,DIP8,MSOP8 (NJU2103A）

Characteristics


System Reset ICs

System Reset IC with built-in Watch Dog Timer

	NJU2102A
Operating Voltage Range	3.5 to 18V
Detection voltage	4.2V±1.0％
Reference Voltage	1.235V±1.5%
Reset Hold Time (CT=0.1μF)	100ms±50ms
WDT Monitoring Time (CT=0.1μF)	10ms±5ms
WDT Reset Time (CT=0.1μF)	2ms±1ms
Consumption Current (typ.)	320㎂
Operating Temperature Range	-40 to 125℃
Package	DMP8
Note	Compatible with NJM2102, MB3773

Applications
>Industrial Equipment
>Housing Equipment
>OA Equipment
>Amusement Equipment
>Not limited to the above, all electrical equipment including power supply circuits

Source：https://www.njr.com