ADM6384YKS23D3Z-R7 查看數據表（PDF） - Analog Devices

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ADM6384YKS23D3Z-R7

Microprocessor Supervisory Circuit in 4-Lead SC70

Analog Devices 

ADM6384

APPLICATIONS INFORMATION

NEGATIVE-GOING VCC TRANSIENTS

To avoid unnecessary resets caused by fast power supply tran-

sients, the ADM6384 is equipped with glitch rejection circuitry.

The typical performance characteristic shown in Figure 10 plots

VCC transient duration vs. the transient magnitude. The curves

show combinations of transient magnitude and duration for which

a reset is not generated for 4.63 V and 2.93 V reset threshold

parts. For example, with the 2.93 V threshold, a transient that

goes 100 mV below the threshold and lasts 8 µs typically does not

cause a reset, but if the transient is any greater in magnitude or

duration, a reset is generated. An optional 0.1 µF bypass capacitor

mounted close to VCC provides additional glitch rejection.

ENSURING RESET VALID TO VCC = 0 V

Both active-low and active-high reset outputs are guaranteed to

be valid for VCC as low as 1 V. However, by using an external

resistor with push-pull configured reset outputs, valid outputs

for VCC as low as 0 V are possible. For an active-low reset out-

put, a resistor connected between RESET and ground pulls the

output low when it is unable to sink current. A large resistance

such as 100 kΩ should be used to avoid overloading the reset

output when VCC is above 1 V.

VCC

ADM6384

RESET

GND

100kΩ

Figure 13. Ensuring Reset Valid to VCC = 0 V

Rev. C | Page 10 of 12

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