MAX6467XS17D7-T(2015) 查看數據表（PDF） - Maxim Integrated

零件编号

产品描述 (功能)

生产厂家

MAX6467XS17D7-T
(Rev.:2015)

Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset

Maxim Integrated 

MAX6467/MAX6468

Microprocessor Supervisory Reset Circuits

with Edge-Triggered, One-Shot Manual Reset

VCC

VTH

GND

MR

GND

SWITCH

BOUNCE

SWITCH

BOUNCE

SWITCH

BOUNCE

RESET

tRP

tMRP

GND

Figure 1. Timing Diagram

tDEB

tMRP

Detailed Description

Reset Output

The MAX6467 provides an active-low open-drain

RESET output. The MAX6468 provides an active-low

push-pull RESET output. RESET asserts low if VCC

drops below the selected threshold or if a falling edge

occurs on MR. RESET remains low for the VCC reset

timeout period after VCC increases above the threshold

voltage or is one-shot pulsed low for the MR timeout

period after a falling edge on MR.

Manual Reset Input

Many µP-based products require manual reset capability,

allowing the operator, a test technician, or external logic

circuitry to initiate a reset. A falling edge on MR asserts

RESET low. RESET is one-shot pulsed low for the MR

timeout period after a falling edge on MR. An internal

1.5kΩ pullup resistor to VCC allows MR to be left uncon-

nected if not used. MR can be driven with TTL or CMOS-

logic levels, or with open-drain/collector outputs. Connect

a normally open momentary pushbutton switch from

MR to GND to realize a manual reset function. External

debounce circuitry is not required, as the MAX6467/

MAX6468 respond to the first falling edge on MR and

ignore subsequent falling edges within the reset timeout

period and during the MR debounce period (see Figure

1). After MR goes high for 150ms (tDEB), the manual reset

one-shot is ready to trigger a reset on the next MR falling

edge. Connect a 0.1µF capacitor from MR to GND when

using long cables to provide additional noise immunity

(Figure 2).

www.maximintegrated.com

Maxim Integrated │  6

Share Link: