Datasheet

MAX706P/R/S/T, MAX706AP/AR/AS/AT, MAX708R/S/T
+3V Voltage Monitoring, Low-Cost µP
Supervisory Circuits
10 ______________________________________________________________________________________
Ordering Information (continued)
Chip Information
PROCESS: CMOS
sees 1.25V when V
IN
falls to the desired trip point
(V
TRIP
). Resistor R3 adds hysteresis. R3 will typically
be an order of magnitude greater than R1 and R2. The
current through R1 and R2 should be at least 1µA to
ensure that the 25nA (max) PFI input current does not
shift the trip point significantly. R3 should be larger than
10kΩ to prevent it from loading down the PFO pin.
Capacitor C1 adds noise rejection.
Monitoring a Negative Voltage
The power-fail comparator can be used to monitor a
negative supply voltage using the circuit of Figure 8.
When the negative supply is valid, PFO is low. When
the negative supply voltage drops, PFO goes high. This
circuit’s accuracy is affected by the PFI threshold toler-
ance, the V
CC
voltage, and resistors R1 and R2.
Bypassing V
CC
For noisy systems, bypass V
CC
with a 0.1µF capacitor
to GND.
PART†
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
MAX706PEUA -40°C to +85°C 8 µMAX U8-1
MAX706PMJA -55°C to +125°C 8 CERDIP* J8-2
MAX706RCPA 0°C to +70°C 8 Plastic Dip P8-1
MAX706RCSA 0°C to +70°C 8 SO S8-2
MAX706RCUA 0°C to +70°C 8 µMAX U8-1
MAX706REPA -40°C to +85°C 8 Plastic Dip P8-1
MAX706RESA -40°C to +85°C 8 SO S8-2
MAX706REUA -40°C to +85°C 8 µMAX U8-1
MAX706RMJA -55°C to +125°C 8 CERDIP* J8-2
MAX706SCPA 0°C to +70°C 8 Plastic Dip P8-1
MAX706SCSA 0°C to +70°C 8 SO S8-2
MAX706SCUA 0°C to +70°C 8 µMAX U8-1
MAX706SEPA -40°C to +85°C 8 Plastic Dip P8-1
MAX706SESA -40°C to +85°C 8 SO S8-2
MAX706SEUA -40°C to +85°C 8 µMAX U8-1
MAX706SMJA -55°C to +125°C 8 CERDIP* J8-2
MAX706TCPA 0°C to +70°C 8 Plastic Dip P8-1
MAX706TCSA 0°C to +70°C 8 SO S8-2
MAX706TCUA 0°C to +70°C 8 µMAX U8-1
MAX706TEPA -40°C to +85°C 8 Plastic Dip P8-1
MAX706TESA -40°C to +85°C 8 SO S8-2
MAX706TEUA -40°C to +85°C 8 µMAX U8-1
MAX706TMJA -55°C to +125°C 8 CERDIP* J8-2
M A X7 0 6 A PE P A -40°C to +85°C 8 Plastic Dip P8-1
M AX 706AP E S A -40°C to +85°C 8 SO S8-2
M AX 706AP E U A -40°C to +85°C 8 µMAX U8-1
MAX706AREPA -40°C to +85°C 8 Plastic Dip P8-1
MAX706ARESA -40°C to +85°C 8 SO S8-2
MAX706AREUA -40°C to +85°C 8µMAX U8-1
MAX706ASEPA -40°C to +85°C 8 Plastic Dip P8-1
PART†
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
MAX706ASESA -40°C to +85°C 8 SO S8-2
MAX706ASEUA -40°C to +85°C 8 µMAX U8-1
MAX706ATEPA -40°C to +85°C 8 Plastic Dip P8-1
MAX706ATESA -40°C to +85°C 8 SO S8-2
MAX706ATEUA -40°C to +85°C 8 µMAX U8-1
MAX708RCPA 0°C to +70°C 8 Plastic Dip P8-1
MAX708RCSA 0°C to +70°C 8 SO S8-2
MAX708RCUA 0°C to +70°C 8 µMAX U8-1
MAX708REPA -40°C to +85°C 8 Plastic Dip P8-1
MAX708RESA -40°C to +85°C 8 SO S8-2
MAX708REUA -40°C to +85°C 8 µMAX U8-1
MAX708RMJA -55°C to +125°C 8 CERDIP* J8-2
MAX708SCPA 0°C to +70°C 8 Plastic Dip P8-1
MAX708SCSA 0°C to +70°C 8 SO S8-2
MAX708SCUA 0°C to +70°C 8 µMAX U8-1
MAX708SEPA -40°C to +85°C 8 Plastic Dip P8-1
MAX708SESA -40°C to +85°C 8 SO S8-2
MAX708SEUA -40°C to +85°C 8 µMAX U8-1
MAX708SMJA -55°C to +125°C 8 CERDIP* J8-2
MAX708TCPA 0°C to +70°C 8 Plastic Dip P8-1
MAX708TCSA 0°C to +70°C 8 SO S8-2
MAX708TCUA 0°C to +70°C 8 µMAX U8-1
MAX708TEPA -40°C to +85°C 8 Plastic Dip P8-1
MAX708TESA -40°C to +85°C 8 SO S8-2
MAX708TEUA -40°C to +85°C 8 µMAX U8-1
MAX708TMJA -55°C to +125°C 8 CERDIP* J8-2
†
SO, µMAX, and PDIP packages are available in lead-free.
*Contact factory for availability and processing to MIL-STD-883.