Features: *Precise monitoring of 2.5V, 3.3V, and 5V supply voltages
*Fully specified over temperature
Industrial: −40˚C to +85˚C
Extended: −40˚C to +125˚C
*100 ms minimum Power-On Reset pulse width, 190 ms ypical:
Active-Low RESET Output (LM3722)
Active-High RESET Output (LM3723)
Active-Low RESET Open Drain Output (LM3724)
*Guaranteed RESET Output valid for VCC 1V
*Low Supply Current, 6µA typical
*Power supply transient immunity
*Compatible with MAX811/812 applicationsApplicationMicroprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered EquipmentPinout
SpecificationsVCC,MR.............................................−0.3V to 6.0V
RESET, RESET........................−0.3V to (VCC+ 0.3V)
Input Current, VCC Pin..................................20mA
Output Current, RESET,
RESETPin..................................................... 20mA
ESD Rating (Note 2)........................................ 2kV
Continuous Power Dissipation (TA = +70˚C)
SOT-23 (Note 3)..................................... 320mW
Operating Temperature Range
Industrial: .................................... −40˚C to +85˚C
Extended: .................................. −40˚C to +125˚C
Maximum Junction Temperature...................125˚C
Storage Temperature Range..... −65˚C to +160˚C
Lead Temperature
(soldering, 10sec) ......................................+300˚C
| Power on Reset |
Yes |
| Watchdog |
No |
| Power Fail Input |
No |
| Manual Reset |
Yes |
| Reset Timeout Period |
190 ms |
| On/Off Pin |
Yes |
| Error Flag |
Yes |
| Input Min Voltage |
1 Volt |
| Input Max Voltage |
6 Volt |
| Output Current |
20 mA |
| RegType |
Supervisor |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Voltage Supervised |
2.5 Volt |
| View Using Catalog |
DescriptionThe LM3722/LM3723/LM3724 microprocessor supervisory circuits monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, power-down, brown-out conditions, and manual reset.
The LM3722/LM3723/LM3724 asserts a reset signal whenever the supply decreases below the factory-programmed reset threshold. Reset will be asserted for at least 100ms even after VCC rises above the reset threshold.
The LM3722 has an active-low ^RESET push-pull output. The LM3723 has an active-high RESET push-pull output. The LM3724 has an active-low open-drain ^RESET output.
Three standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional reset voltages are also available; contact National Semiconductor for details.
With a low supply current of only 6µA, the LM3722/LM3723/LM3724 are ideal for use in portable equipment. The LM3722/LM3723/LM3724 are available in the 5-pin SOT23 package.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM3722EM5-2.32 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722EM5-3.08 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722EM5-4.63 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722EM5X-3.08 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722IM5-2.32 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722IM5-3.08 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722IM5-4.63 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722IM5X-2.32 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722IM5X-3.08 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM3722IM5X-4.63 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
Reference Designs
| • |
RD-143 - Lowest Power 8-bit 3 GSPS Data Acquisition System |
LM3722 Data Sheet
