IMP705 查看數據表（PDF） - IMP, Inc

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IMP705

Low-Power µP Supervisor Circuits

IMP, Inc 

IMP705/6/7/8, 813L

Application Information

Ensuring That RESET is Valid Down to VCC = 0V

When VCC falls below 1.1V, the IMP705-708 RESET output no

longer pulls down; it becomes indeterminate. To avoid the possi-

bility that stray charges build up and force RESET to the wrong

state, a pull-down resistor should be connected to the RESET pin,

thus draining such charges to ground and holding RESET

low. The resistor value is not critical. A 100kΩ resistor will pull

RESET to ground without loading it.

Bi-directional Reset Pin Interfacing

The IMP705/6/7/8 can interface with µP/µC bi-directional reset

pins by connecting a 4.7kΩ resistor in series with the RESET

output and the µP/µC bi-directional RESET pin.

BUF

Buffered

RESET

VCC < 1.1V

VCC

VCC

IMP70x

RESET

GND

100k9

705_06.eps

Power

Supply

IMP70x

4.7kΩ

RESET

µC or µP

RESET

Input

GND

GND

Bi-directional I/O Pin

(Example: 68HC11)

705_08.eps

Figure 3. Ensuring That RESET is Valid Down to VCC = 0V

Figure 3. Bi-directional Reset Pin Interfacing

6

408-432-9100/www.impweb.com

© 1999 IMP, Inc.

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