MAX6832HXRD3-T Maxim Integrated, MAX6832HXRD3-T Datasheet - Page 6

• Manufacturer Part Number: MAX6832HXRD3-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840r

Specifications of MAX6832HXRD3-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.2 V to 1.8 V
• Undervoltage Threshold: 1.275 V
• Overvoltage Threshold: 1.35 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 210 ms
• Supply Voltage - Max: 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SC-70
• Chip Enable Signals: No
• Maximum Power Dissipation: 235 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 16 uA
• Supply Voltage - Min: 0.55 V

A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6832–MAX6840 assert a reset to
prevent code-execution errors during power-up, power-
down, or brownout conditions. They also assert a reset
signal whenever the V
preset threshold (MAX6832–MAX6837) or RESET-IN
falls below the adjustable threshold (MAX6838/
MAX6839/MAX6840), keeping reset asserted for a fixed
timeout delay (Table 2) after V
above the reset threshold. The MAX6832/MAX6835/
MAX6838 use a push-pull active-low output, the
MAX6833/MAX6836/MAX6839 have a push-pull active-
high output, and the MAX6834/MAX6837/MAX6840
have an open-drain active-low output stage. Connect a
pullup resistor on the MAX6834/MAX6837/MAX6840’s
RESET output to any supply between 0 and 6V.
Many µP-based systems require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while MR is low, and for a fixed timeout delay after MR
returns high. This input has an internal 20kΩ pullup
resistor, so it can be left open if it is not used. MR can
be driven with CMOS logic level, or with open-drain/col-
lector outputs. To create a manual reset function, con-
nect a normally open momentary switch from MR to
ground; external debounce circuitry is not required. If
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
6
V
CC
_______________________________________________________________________________________
PULLUP
Detailed Description
MR
V
CC
REF
= 444mV
MR (MAX6835/MAX6836/MAX6837 ONLY)
supply voltage falls below a
CC
Manual Reset Input
MAX6832–
or RESET-IN has risen
MAX6837
TIMEOUT
MANUAL
DETECT
PERIOD
RESET
RESET
Reset Output
OUTPUT
RESET
GND
RESET/
RESET
RESET-IN
MR is driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor from
MR to ground provides additional noise immunity.
The MAX6838/MAX6839/MAX6840 feature a RESET-IN
input for monitoring supply voltages down to 0.44V. An
external resistive-divider network can be used to set
voltage monitoring thresholds as shown in Figure 1. As
the monitored voltage falls, the voltage at RESET-IN
decreases and asserts a reset when it falls below the
RESET-IN threshold (V
Figure 1. Setting the Adjustable Threshold Externally
R1 = R2 [(V
WHERE V
V
REF
= 444mV
V
MONITORED
MONITORED
R1
R2
MONITORED
IS THE DESIRED TRIP LEVEL,
V
/V
REF
REF
= 444mV
RESET-IN
) -1]
Functional Diagrams
RSTIN
MAX6838/
MAX6839/
MAX6840
MAX6838/
MAX6839/
MAX6840
RESET-IN Information
TIMEOUT
PERIOD
GND
RESET
V
). The low-leakage current
CC
(RESET)
RESET
OUTPUT
RESET
( ) ARE FOR MAX6839
V
CC
GND
RESET/
RESET