NJR Begins Mass Production of System Reset ICs NJU2103A/NJU2103B and System Reset IC NJU2102A with Built-in Watch Dog Timer
Nisshinbo Micro Device (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.※
- 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.※
- It can detect 4.2V±1.0% power supply voltage
- Built-in Watch Dog Timer
- ※
It is determined that it can be replaced based on compatibility of key characteristics and function.
Some of the specs have characteristics differences, so please evaluate them sufficiently with actual machine before use.
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） |
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As an example
Characteristics
System Reset ICs
| NJU2103A | NJU2103B | |
|---|---|---|
| Operating Voltage Range | 2.5 to 18V | 2.5 to 18V |
| VSADetection voltage | 4.2V±1.0% | 4.2V±1.0% |
| VSBDetection voltage | 1.22V±1.0% | 1.23V±1.0% |
| VSCDetection voltage | 1.235V±1.0% | 1.245V±1.0% |
| Reset Hold Time (CT=0.01μF) | 1.5ms±0.5ms | 1.0ms±0.5ms |
| Consumption Current (typ.) | 280㎂ | 280㎂ |
| Operating temperature Range | -40 to 125℃ | -40 to 125℃ |
| Packages |
DMP8
MSOP8
DIP8 |
SOP8 JEDEC 150MIL |
| Note | Compatible with NJM2103 | Compatible with MB3771 |
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