MAX6400BS24-T Maxim Integrated, MAX6400BS24-T Datasheet - Page 5

• Manufacturer Part Number: MAX6400BS24-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6400, MAX6401, MAX6402, MAX6403, MAX6404, MAX6405r

Specifications of MAX6400BS24-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.2 V to 5.5 V
• Undervoltage Threshold: 2.364 V
• Overvoltage Threshold: 2.436 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 280 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: UCSP
• Chip Enable Signals: No
• Maximum Power Dissipation: 303 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 1 uA
• Supply Voltage - Min: 1 V

A microprocessor’s (µP’s) reset input starts the µP in a
known state. These µP supervisory circuits assert reset
to prevent code execution errors during power-up,
power-down, or brownout conditions.
RESET is guaranteed to be a logic low for V
1V. Once V
timer keeps RESET low for the reset timeout period;
after this interval, RESET goes high.
If a brownout condition occurs (V
reset threshold), RESET goes low. Any time V
below the reset threshold, the internal timer resets to
zero, and RESET goes low. The internal timer starts
after V
remains low for the reset timeout period.
The manual reset input (MR) can also initiate a reset,
see the Manual Reset Input section. The MAX6401/
MAX6404 have active-high RESET outputs that are the
inverse of the MAX6400/MAX6402/MAX6403/MAX6405
outputs (Figure 1).
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuit to initiate a reset. A logic low on MR asserts
reset. Reset remains asserted while MR is low, and for
MAX6400/MAX6402
MAX6403/MAX6405
CC
returns above the reset threshold, and RESET
A1
B1
B2
A2
—
CC
exceeds the reset threshold, an internal
µP Supervisory Circuits in 4-Bump (2
_______________________________________________________________________________________
PIN
Detailed Description
MAX6401/MAX6404
Manual Reset Input
A1
B1
B2
A2
—
CC
Reset Output
dips below the
CC
CC
down to
RESET
RESET
NAME
GND
goes
V
MR
CC
the reset active timeout period (t
high. This input has an internal 50kΩ pullup resistor, so
it can be left open if it is not used. MR can be driven
with TTL or CMOS logic levels, or with open-drain/col-
lector outputs. Connect a normally open momentary
switch from MR to GND to create a manual reset func-
tion; external debouncing circuitry is not required. If MR
is driven from long cables or if the device is used in a
noisy environment, connect a 0.1µF capacitor from MR
to ground to provide additional noise immunity (see
Figure 1).
Since the RESET output on the MAX6402/MAX6405 is
open-drain, these devices interface easily with (µPs)
that have bidirectional reset pins. Connecting the µP
supervisor’s RESET output directly to the microcon-
troller’s (µC’s) RESET pin with a single pullup resistor
allows either device to assert reset (Figure 2).
These devices are relatively immune to short-duration,
negative-going V
The Typical Operating Characteristics show the
Maximum Transient Duration vs. Reset Threshold
Overdrive graph, for which reset pulses are not gener-
Ground
Active-Low Reset Output, (Open-Drain or Push-Pull). RESET
is asserted low when the V
reset threshold. RESET remains low for the reset timeout
period after V
drain outputs require an external pullup resistor.
Active-High Reset Output. RESET remains high while V
below the reset threshold and for at least 100ms after V
rises above the reset threshold.
Active-Low Manual Reset. Internal 50kΩ pullup to V
low to assert a reset. Reset remains asserted as long as MR
is low and for the reset timeout period after MR goes high.
Leave unconnected or connect to V
Supply Voltage and Input for the Reset Threshold Monitor
Chip-Scale Package
Interfacing to µP with Bidirectional
CC
Negative-Going VCC Transients
exceeds the device reset threshold. Open-
Applications Information
CC
transients (glitches).
FUNCTION
CC
input is below the selected
Pin Description
CC
RP
if unused.
) after MR returns
Reset Pins
CC
✕
. Pull
CC
CC
2)
is
5