MAX6709CUB Maxim Integrated, MAX6709CUB Datasheet - Page 9

• Manufacturer Part Number: MAX6709CUB
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6709, MAX6714r

Specifications of MAX6709CUB

• Number Of Voltages Monitored: 4
• Monitored Voltage: 1.8 V, 2.5 V, 3 V, 3.3 V, 5 V
• Undervoltage Threshold: 4.25 V, 2.85 V, 1.53 V, Adjustable
• Overvoltage Threshold: 4.5 V, 3 V, 1.62 V, Adjustable
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Package / Case: uMAX
• Maximum Power Dissipation: 444 mW
• Minimum Operating Temperature: - 40 C
• Supply Current (typ): 35 uA
• Supply Voltage - Min: 2 V

Figure 3. Quad Undervoltage Detector with LED Indicators
Figure 5. Window Detection
resistors are not required when using the MAX6709/
MAX6714 because hysteresis is built into the device.
MAX6709/MAX6714 hysteresis is typically 0.3% of the
threshold voltage.
The open-drain outputs of the MAX6709/MAX6714 can
be configured to detect an undervoltage condition.
Figure 3 shows a configuration where an LED turns on
when the comparator output is low, indicating an
undervoltage condition.
The MAX6709/MAX6714 can also be used in applica-
tions such as system supervisory monitoring, multivolt-
age level detection, and V
(Figure 4).
INPUT
V
V
V
TH1
TH4
REF
=
= 0.62V
=
(
(
1 +
1 +
R2
R1
R4
R3
5V
V1
V2
V3
V4
Low-Voltage, High-Accuracy Quad, Voltage
)
)
V
V
R2
R4
REF
REF
IN1
IN2
IN3
IN4
Undervoltage Detection Circuit
R1
R3
_______________________________________________________________________________________
MAX6709
GND
V
IN1
IN2
IN3
IN4
CC
PWRGD1
PWRGD2
PWRGD3
PWRGD4
MAX6709
GND
V
5V
CC
CC
PWRGD1
PWRGD2
PWRGD3
PWRGD4
bar graph monitoring
OUT
Monitors in µMAX Package
A window detector circuit uses two auxiliary inputs in a
configuration such as the one shown in Figure 5.
External resistors R1–R4 set the two threshold voltages
(V
width ( V
voltages (Figure 6).
The MAX6709 offers several monitor options with
adjustable reset thresholds. The MAX6714 has three
monitored inputs with adjustable thresholds. The thresh-
old voltage at each adjustable IN_ (PFI_) input is typically
0.62V. To monitor a voltage >0.62V, connect a resistor-
divider network to the circuit as shown in Figure 7.
Figure 4. V
Figure 6. Output Response of Window Detector Circuit
TH1
V
IN
and V
(5V)
CC
TH
PWRGD1
PWRGD4
TH4
V
Bar Graph Monitoring
) is the difference between the threshold
OUT
INTH
IN1
IN2
IN3
IN4
) of the window detector circuit. Window
MAX6709
= 0.62V
GND
V
5V
V
CC
TH4
PWRGD1
PWRGD2
PWRGD3
PWRGD4
V
TH
✕
(R1 + R2) / R2
Window Detection
V
TH1
Adjustable Input
D1
D2
D3
D4
9