68HC11/Bidirectional-Compatible
µP Reset Circuit
MAX6314
______________________________________________________________Pin Description
PIN
1
2
NAME
GND
RESET
Ground
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 4.7kΩ resistor to facilitate connection to µPs with bidirectional resets. See
the
Reset Output
section.
Manual Reset Input. A logic low on
MR
asserts reset. Reset remains asserted as long as
MR
is low, and for
the reset timeout period (t
RP
) after the reset conditions are terminated. Connect to V
CC
if not used.
Supply Voltage and Reset Threshold Monitor Input
FUNCTION
3
4
MR
V
CC
V
CC
LASER-
TRIMMED
RESISTORS
MAX6314
VREF
V
CC
63k
RESET
GENERATOR
V
CC
2µs ONE-SHOT
TRANSITION
FLIP-FLOP
R
FF
S
Q
4.7k
MR
RESET
ACTIVE PULL-UP
ENABLE COMPARATOR
0.5V
GND
Figure 1. Functional Diagram
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
