MAX6468XS44D7-T Maxim Integrated, MAX6468XS44D7-T Datasheet - Page 6
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MAX6468XS44D7-T
Manufacturer Part Number
MAX6468XS44D7-T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6467, MAX6468r
Datasheet
1.MX7820LN.pdf
(9 pages)
Specifications of MAX6468XS44D7-T
Number Of Voltages Monitored
1
Monitored Voltage
1.8 V to 5 V
Undervoltage Threshold
4.266 V
Overvoltage Threshold
4.484 V
Output Type
Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
1800 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SC-70
Chip Enable Signals
No
Maximum Power Dissipation
245 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
7 uA
Supply Voltage - Min
1 V
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
V
Characteristics section shows the Maximum Transient
Duration vs. V
MAX6468 do not generate a reset pulse. This graph was
generated using a falling pulse applied to V
above the actual reset threshold and ending below the
threshold by the magnitude indicated (V
The graph indicates the typical maximum pulse width a
falling V
pulse. As the magnitude of the transient increases (goes
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
*Additional reset timeout options may be available. Contact factory for availability.
Figure 2. Functional Diagram
6
CC
RESET TIMEOUT SUFFIX
V
MR
_______________________________________________________________________________________
CC
transients (glitches). The Typical Operating
CC
V
CC
transient can have without initiating a reset
1.5kΩ
D3
D7
CC
Applications Information
Overdrive for which the MAX6467/
1.23V
V
GND
CC
Falling V
MR ONE-SHOT/
DEBOUNCE
V
TIMEOUT
PERIOD
RESET
CC
RESET TIMEOUT PERIOD
MAX6467
MAX6468
(min/max) (ms)
CC
1200/2400
OUTPUT
150/300
RESET
CC
Transients
Overdrive).
CC
starting
RESET
farther below the reset threshold), the maximum allowable
pulse width decreases. A 0.1µF bypass capacitor from
V
The MAX6467/MAX6468 guarantee proper operation
down to V
reset levels down to V
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 V
cations, use 100kΩ to 1MΩ.
MR TIMEOUT PERIOD
Figure 3. RESET Valid to V
TRANSISTOR COUNT: 748
PROCESS: BiCMOS
CC
(min/max) (ms)
to GND provides additional transient immunity.
150/300
150/300
Ensuring a Valid RESET Output Down
CC
CC
is above the reset threshold. For most appli-
= +1V. In applications that require valid
Reset Timeout Delay*
MAX6468
CC
CC
GND
V
MR RISING DEBOUNCE PERIOD
CC
= 0V
= 0V, a pulldown resistor to
Chip Information
(min/max) (ms)
RESET
150/300
150/300
to V
CC
R1
100kΩ
= 0V