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MAX6467 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX6467
Description  Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6467 Datasheet(HTML) 5 Page - Maxim Integrated Products

   
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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
1.5k
Ω 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).
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
_______________________________________________________________________________________
5
Pin Description
PIN
NAME
FUNCTION
1
GND
Ground
2
RESET
Reset Output. RESET is an active-low open-drain (MAX6467) or push-pull (MAX6468) output. RESET asserts
low when VCC drops below the selected threshold and remains low for the VCC reset timeout period after
VCC rises above the threshold. The RESET one-shot asserts low for a fixed MR reset timeout period on the
falling edge of the manual reset input. The open-drain output requires an external pullup resistor.
3
MR
Manual Reset Input. Drive MR low to initiate a reset output. MR controls an edge-triggered one-shot that
asserts RESET low for a fixed MR timeout period when MR is driven low. Internal timing circuitry ignores
switch close and open bounce to ensure proper one-shot reset timing.
4VCC
Power-Supply Input. VCC provides power to the device and is also a monitored voltage. When VCC drops
below the selected threshold, RESET asserts low and remains low for the reset timeout period after VCC rises
above the threshold. For better noise immunity, bypass VCC to GND with a 0.1µF capacitor.
VCC
GND
GND
MR
tRP
GND
RESET
VTH
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
tMRP
tMRP
tDEB
Figure 1. Timing Diagram


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