Figure 1. Functional Diagram

68HC11/Bidirectional-Compatible

µP Reset Circuit

4

_______________________________________________________________________________________

______________________________________________________________Pin Description

Supply Voltage and Reset Threshold Monitor Input

4

Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for

MR

3

PIN

Active-Low Complementary Output. In addition to the normal N-channel pull-down, RESET has a P-channel

pull-up transistor in parallel with a 4.7k

Ω resistor to facilitate connection to µPs with bidirectional resets. See

the

Reset Output section.

RESET

2

Ground

GND

1

FUNCTION

NAME

MAX6314

LASER-

TRIMMED

RESISTORS

VREF

63k

MR

RESET

GENERATOR

2µs ONE-SHOT

TRANSITION

FLIP-FLOP

RQ

S

FF

4.7k

RESET

ACTIVE PULL-UP

ENABLE COMPARATOR

0.5V

GND