MAX3248EEAI+ Maxim Integrated, MAX3248EEAI+ Datasheet - Page 9

• Manufacturer Part Number: MAX3248EEAI+
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3238E, MAX3248Er

The MAX6715–MAX6729 microprocessor (µP) supervi-
sory circuits maintain system integrity by alerting the µP
to fault conditions. These ICs are optimized for systems
that monitor two or three supply voltages. The output-
reset state is guaranteed to remain valid while either
V
Input voltage threshold level combinations are indicat-
ed by a two-letter code in the Reset Voltage Threshold
MAX6715/
MAX6716
CC
—
—
1 or V
CC
MAX6717/
MAX6718
2 is above 0.8V.
—
—
_______________________________________________________________________________________
Dual/Triple Ultra-Low-Voltage SOT23 µP
MAX6719/
MAX6720
Detailed Description
—
—
MAX6721/
MAX6722
Threshold Levels
Supply Voltages
—
—
PIN
MAX6723/
MAX6724
—
—
MAX6725/
MAX6726
—
4
Suffix Guide (Table 1). Contact factory for availability of
other voltage threshold combinations.
The MAX6715–MAX6729 provides an active-low reset
output (RST) and the MAX6725/MAX6726 provides
both an active-high (RST) and an active-low reset out-
put (RST). RST, RST, RST1, and RST2 are asserted
when the voltage at either V
voltage threshold level, RSTIN drops below threshold,
or MR is pulled low. Once reset is asserted it stays low
for the reset timeout period (see Table 2). If V
V
the reset timeout period is completed, the internal timer
CC
MAX6727
2, or RSTIN goes below the reset threshold before
Supervisory Circuits
—
—
Pin Description (continued)
MAX6728/
MAX6729
—
4
NAME
PFO
RST
CC
1 or V
Active-Low Power-Fail
Monitor Output, Open-
Drain or Push-Pull. PFO is
asserted low when PFI is
less than 0.626V. PFO
deasserts without a reset
timeout period. Open-
drain outputs require an
external pullup resistor.
Push-pull outputs are
referenced to V
Active-High Reset
Output, Open-Drain or
Push-Pull. RST changes
from low to high when
V
below selected reset
thresholds, RSTIN is
below threshold, MR is
pulled low, or the
watchdog triggers a
reset. RST remains HIGH
for the reset timeout
period after V
V
device reset thresholds,
MR goes low to high, or
the watchdog triggers a
reset. Open-drain outputs
require an external pullup
resistor. Push-pull
outputs are referenced to
V
CC
CC
CC
1 or V
1.
2/RSTIN exceed the
CC
Reset Outputs
FUNCTION
2 falls below the
CC
2 drops
CC
CC
1/
1.
CC
1,
9