MAX6413UK23-T Maxim Integrated, MAX6413UK23-T Datasheet - Page 7

• Manufacturer Part Number: MAX6413UK23-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6412, MAX6413, MAX6414, MAX6415, MAX6416, MAX6417, MAX6418, MAX6419, MAX6420r

Specifications of MAX6413UK23-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.6 V to 5 V
• Undervoltage Threshold: 2.313 V
• Overvoltage Threshold: 2.371 V
• Output Type: Active High, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 5.4 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23
• Chip Enable Signals: No
• Maximum Power Dissipation: 571 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 2.7 uA
• Supply Voltage - Min: 1 V

Figure 4. MAX6418/MAX6419/MAX6420 Monitoring Two Voltages
The MAX6418/MAX6419/MAX6420 contain both facto-
ry-trimmed threshold voltages and an adjustable reset
threshold input, allowing the monitoring of two voltages,
V
when either of the voltages falls below its respective
threshold voltage.
The reset timeout period is adjustable to accommodate
a variety of µP applications. Adjust the reset timeout
period (t
SRT and ground. Calculate the reset timeout capacitor
as follows:
where t
Maxim Integrated
CC
Low-Power, Single/Dual-Voltage µP Reset Circuits
and V
RP
with Capacitor-Adjustable Reset Timeout Delay
RP
is in seconds and C
C
) by connecting a capacitor (C
MON_TH
SRT
(MAX6418/MAX6419/MAX6420)
= (t
Application Information
Selecting a Reset Capacitor
RP
(see Figure 4). Reset is asserted
C
SRT
- 275µs) / (2.71
R1
R2
V
Dual-Voltage Monitoring
MON_TH
SRT
RESET IN
GND
SRT
is in Farads
1.26V
V
CC

LASER-TRIMMED
10
RESISTORS
SRT
6
)
) between
MAX6418
MAX6419
MAX6420
CIRCUITRY
RESET
V
CC
The reset delay time is set by a current/capacitor-con-
trolled ramp compared to an internal 0.65V reference.
An internal 240nA ramp current source charges the
external capacitor. The charge to the capacitor is
cleared when a reset condition is detected. Once the
reset condition is removed, the voltage on the capacitor
ramps according to the formula: dV/dt = I/C. The C
capacitor must ramp to 0.65V to deassert the reset.
C
ceramic is recommended.
The MAX6412–MAX6420 can be operated in a voltage
detector mode by leaving SRT unconnected. The reset
delay times for V
threshold are not significantly different. The reset output
is deasserted smoothly without false pulses.
SRT
(RESET)
RESET
must be a low-leakage (<10nA) type capacitor,
MAX6412–MAX6420
MAX6420
Operating as a Voltage Detector
ONLY
R
L
CC
rising above or falling below the
µP
SRT
7