MAX6335US16D3-T Maxim Integrated, MAX6335US16D3-T Datasheet - Page 4

• Manufacturer Part Number: MAX6335US16D3-T
• Description: Supervisory Circuits Integrated Circuits (ICs)
• Manufacturer: Maxim Integrated
• Series: MAX6335, MAX6336, MAX6337r

Specifications of MAX6335US16D3-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.8 V, 2.5 V
• Undervoltage Threshold: 1.57 V
• Overvoltage Threshold: 1.63 V
• Output Type: Active High, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 200 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-143-4L
• Chip Enable Signals: No
• Maximum Power Dissipation: 320 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Factory Pack Quantity: 2500
• Supply Current (typ): 3.3 uA
• Supply Voltage - Min: 1.2 V

4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
Many µP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MR is low,
and for the reset active timeout period after MR returns
high. MR has an internal 20kΩ pull-up resistor, so it can
be left unconnected if not used. Connect a normally
open momentary switch from MR to GND to create a
manual-reset function; external debounce circuitry is
not required.
Since the RESET output on the MAX6337 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output directly
to the microcontroller’s (µC’s) RESET pin with a single
pull-up resistor allows either device to assert reset
(Figure 1).
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
V
Characteristics show the Maximum Transient Duration
vs. Reset Comparator Overdrive graph. The graph
shows the maximum pulse width that a negative-going
V
4
CC
CC
MAX6335
_______________________________________________________________________________________
transient may typically have without issuing a reset
transients (glitches). The Typical Operating
—
1
2
3
4
PIN
Negative-Going V
Applications Information
MAX6336
MAX6337
—
1
2
3
4
Bidirectional Reset Pins
Interfacing to µPs with
Manual-Reset Inputs
RESET
RESET
NAME
GND
V
MR
CC
CC
Transients
Ground
Active-Low Reset Output. RESET remains low while V
threshold, or MR is asserted and for a reset timeout period (t
rises above the reset threshold, or MR is deasserted. RESET on the
MAX6337 is open-drain.
Active-High Reset Output. RESET remains high while V
reset threshold, or MR is asserted and for a reset timeout period (t
V
asserts when MR is low.
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
MR goes high. Leave unconnected or connect to V
Supply Voltage (0.7V to 5.5V)
CC
rises above the reset threshold, or MR is deasserted. RESET also
signal. As the amplitude of the transient increases, the
maximum allowable pulse width decreases.
When V
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESET pin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
µPs and circuitry do not operate at V
the MAX6336, where RESET must be valid down to 0,
adding a pull-down resistor between RESET and GND
removes stray leakage currents, holding RESET low
Figure 1. Interfacing to µPs with Bidirectional Reset Pins
V
CC
CC
MR
falls below 1V and approaches the minimum
MAX6337
GND
V
CC
Ensuring a Valid Reset Output
FUNCTION
RESET
Pin Description
CC
RESET
INPUT
down to V
CC
if not used.
CC
MOTOROLA
CC
68HCXX
is below the reset
GND
V
is below the
µP
CC
below 1V. For
RP
) after V
RP
RP
CC
) after
) after
CC
= 0