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MAX6467 Datasheet(PDF) 6 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) 6 Page - Maxim Integrated Products

   
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Applications Information
Falling VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX6467/
MAX6468 are relatively immune to short-duration falling
VCC transients (glitches). The Typical Operating
Characteristics section shows the Maximum Transient
Duration vs. VCC Overdrive for which the MAX6467/
MAX6468 do not generate a reset pulse. This graph was
generated using a falling pulse applied to VCC starting
above the actual reset threshold and ending below the
threshold by the magnitude indicated (VCC Overdrive).
The graph indicates the typical maximum pulse width a
falling VCC transient can have without initiating a reset
pulse. As the magnitude of the transient increases (goes
farther below the reset threshold), the maximum allowable
pulse width decreases. A 0.1µF bypass capacitor from
VCC to GND provides additional transient immunity.
Ensuring a Valid RESET Output Down
to VCC = 0V
The MAX6467/MAX6468 guarantee proper operation
down to VCC = +1V. In applications that require valid
reset levels down to VCC = 0V, a pulldown resistor to
active-low outputs (MAX6468 only, Figure 3) ensures
that RESET remains valid while the RESET output can
no longer sink current. This scheme does not work with
the open-drain outputs of the MAX6467. Ensure that the
resistor value used does not overload the RESET output
when VCC is above the reset threshold. For most appli-
cations, use 100k
Ω to 1MΩ.
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
6
_______________________________________________________________________________________
RESET TIMEOUT SUFFIX
VCC RESET TIMEOUT PERIOD
(min/max) (ms)
MR TIMEOUT PERIOD
(min/max) (ms)
MR RISING DEBOUNCE PERIOD
(min/max) (ms)
D3
150/300
150/300
150/300
D7
1200/2400
150/300
150/300
Reset Timeout Delay*
*Additional reset timeout options may be available. Contact factory for availability.
MAX6468
VCC
GND
RESET
R1
100k
Figure 3. RESET Valid to VCC = 0V
Chip Information
TRANSISTOR COUNT: 748
PROCESS: BiCMOS
1.5k
VCC
MR ONE-SHOT/
DEBOUNCE
RESET
TIMEOUT
PERIOD
RESET
OUTPUT
VCC
1.23V
VCC
MR
RESET
GND
MAX6467
MAX6468
Figure 2. Functional Diagram


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