ASM1816

http://onsemi.com

4

Application Information

Operation − Power Monitor

The ASM1816 detects out−of−tolerance power supply

conditions. It resets a processor during power−up, power

down and issues a reset to the system processor when the

monitored power supply voltage is below the reset

detected, the RESET signal is asserted. On power−up,

RESET is kept active (LOW) for approximately 150 ms

after the power supply voltage has reached the selected

tolerance. This allows the power supply and microprocessor

to stabilize before RESET is released.

Figure 3. Timing Diagram: Power−Up

Figure 4. Timing Diagram: Power−Down

Table 4. FAMILY SELECTION GUIDE

Part #

RESET Voltage (V)

RESET Time (ms)

Output Stage

RESET Polarity

ASM1810

4.620, 4.370, 4.120

150

Push−Pull

LOW

ASM1811

4.620, 4.350, 4.130

150

Open−Drain

LOW

ASM1812

4.620, 4.350, 4.130

150

Push−Pull

HIGH

ASM1815

3.060, 2.880, 2.550

150

Push−Pull

LOW

ASM1816

3.060, 2.720, 2.880, 2.550

150

Open−Drain

LOW

ASM1817

3.060, 2.880, 2.550

150

Push−Pull

HIGH

ASM1233D

4.625, 4.375, 4.125

350

Open−Drain

LOW

ASM1233M

4.625, 4.375, 2.720

350

Open−Drain

LOW