ISL88031 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
ISL88031 Datasheet PDF : 8 Pages
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ISL88031
Electrical Specifications
Over the recommended operating conditions, unless otherwise specified. Parameters with MIN and/or MAX
limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
VTH2HYST
VREF
Hysteresis of VTH2
VTH for V3MON, V4MON, V5MON Adj. Reset Threshold
Voltage
VTH2 = 3.09V
VTH2 = 2.92V
VTH2 = 2.32V
VTH2 = 1.69V
+25°C
0°C to +70°C
37
mV
29
mV
23
mV
17
mV
0.589 0.600 0.611 V
0.578 0.600 0.622 V
-40°C to +85°C
0.577 0.600 0.623 V
VREFHYST Hysteresis Voltage
RESET
3
mV
VOL
Reset Output Voltage Low
tRPD
VTH to Reset Asserted Delay
tPOR
POR Timeout Delay
CLOAD Load Capacitance on Reset Pins
MANUAL RESET
VDD ≥ 3.3V, Sinking 2.5mA
VDD < 3.3V, Sinking 1.5mA
0.05 0.40 V
0.05 0.40 V
6
µs
80
120 180 ms
5
pF
VMRL
VMRH
tMR
RPU
MR Input Voltage Low
MR Input Voltage High
MR Minimum Pulse Width
Internal Pull-Up Resistor
0.8 V
VDD - 0.6
V
550
ns
10
kΩ
Pin Descriptions
RST
The RST output is an open drain output, which is asserted
low whenever:
1. the device is initially powered up to 1V or,
2. VDD, V2MON, V3MON, V4MON, or V5MON fall below
their minimum voltage sense level.
MR
The MR input is an active low debounced input to which a
user can connect a push-button to add manual reset
capability or use a signal to pull low. MR has an internal
pull-up resistor.
VDD
The VDD pin is the IC power supply terminal. The voltage at
this pin is compared against an internal factory-programmed
voltage trip point, VTH1. RST is first asserted low when the
device is initially powered and VDD < 1V and then at any
time thereafter when VDD falls below VTH1. The device is
designed with hysteresis to help prevent chattering due to
noise and is immune to brief power-supply transients.
V2MON
The V2MON input is the second preset monitored voltage
that causes the RST output to go low when the voltage on
V2MON falls below VTH2.
V3MON, V4MON, and V5MON
The VxMON inputs provide monitoring and UV compliance
of three additional voltages through resistor dividers. A reset
is issued on the ISL88031 if the voltage on any VxMON falls
below the internal VREF of 0.6V.
Principles of Operation
The ISL88031 device provides those functions needed for
monitoring critical voltages, such as power-supply and battery
functions in microprocessor systems. It provides such features
as Power-On Reset control, Supply Voltage Supervision, and
Manual Reset Assertion. The integration of all these features
along with competitive reset threshold accuracy and low power
consumption, makes the ISL88031 device suitable for a wide
4
FN8227.2
June 9, 2009
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