MAX823LEXK-T Maxim Integrated, MAX823LEXK-T Datasheet - Page 6

• Manufacturer Part Number: MAX823LEXK-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX823, MAX823L, MAX823M, MAX823R, MAX823S, MAX823T, MAX823Y, MAX823Z, MAX824, MAX824L, MAX824M, MAX824R, MAX824S, MAX824T, MAX824Y, MAX824Z, MAX825, MAX825L, MAX825M, MAX825R, MAX825S, MAX825T, MAX825Y, MAX825Zr

Specifications of MAX823LEXK-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 2.5 V, 3 V, 3.3 V, 5 V
• Undervoltage Threshold: 4.56 V
• Overvoltage Threshold: 4.7 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Resettable
• Watchdog: 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: SC-70
• Chip Enable Signals: No
• Maximum Power Dissipation: 247 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 6 uA
• Supply Voltage - Min: 1.2 V

5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
Figure 1. Functional Diagram
6
MAX823
_______________________________________________________________________________________
—
1
2
3
4
5
(MAX823/MAX825
(MAX823/MAX824
MAX824
PIN
ONLY)
ONLY)
—
1
2
3
4
5
V
WDI
MR
CC
MAX825
—
1
2
4
3
5
V
CC
NAME
RESET
RESET
GND
WDI
V
MR
CC
WATCHDOG
TRANSITION
DETECTOR
Active-Low Reset Output. Pulses low for 200ms when triggered, and remains
low whenever V
remains low for 200ms after one of the following occurs: V
reset threshold, the watchdog triggers a reset, or MR goes low to high.
Ground
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as
long as MR is held low and for 200ms after MR returns high. The active-low input
has an internal 52kΩ pullup resistor. It can be driven from a CMOS logic line or
shorted to ground with a switch. Leave open or connect to V
Active-High Reset Output. Inverse of RESET.
Watchdog Input. If WDI remains either high or low for longer than the watch-
dog timeout period, the internal watchdog timer runs out and a reset is trig-
gered. The internal watchdog timer clears whenever reset is asserted, or
whenever WDI sees a rising or falling edge. If WDI is left unconnected or is
connected to a three-stated buffer output, the watchdog feature is disabled.
Supply Voltage
1.25V
CC
GND
is below the reset threshold or when MR is a logic low. It
GENERATOR
WATCHDOG
RESET
TIMER
FUNCTION
MAX823
MAX824
MAX825
Pin Description
RESET
RESET
(MAX824/MAX825
ONLY)
CC
CC
rises above the
if unused.