ISL88021IU8FCZ-TK Intersil, ISL88021IU8FCZ-TK Datasheet - Page 5

• Manufacturer Part Number: ISL88021IU8FCZ-TK
• Description: IC VOLTAGE MON TRIPLE UV 8-MSOP
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of ISL88021IU8FCZ-TK

• Number Of Voltages Monitored: 3
• Output: Open Drain, Push-Pull
• Reset: Active High/Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.332V, 3.085V, Adj
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ISL88021IU8FCZ-TKTR

Manual Reset
The manual reset input (MR) allows the user to trigger a reset
by using a push-button switch or by signaling that pin low. The
MR input is an active low debounced input. By connecting a
push-button directly from MR to ground, the designer adds
manual system reset capability. Reset is asserted if the MR pin
is pulled low to less than 100mV for 1µs or longer while the
push-button is closed or a reset is signaled. After MR is
released, the reset outputs remain asserted for t
has an internal 20kΩ pull up resistor provided.
Figure 3 illustrates a typical application diagram for either IC
showing both reset outputs being used along with both a
manual and signalled reset configuration. The V
V2MON thresholds are preset whereas the V3MON is capable
of UV (ISL88021) or OV (ISL88022) monitoring of a voltage
greater than or less than 0.6V, respectively.
Application Considerations
Follow good decoupling practices to prevent transients from
causing unwanted reset signaling due to switching noises
and short duration droops.
When using the C
on this pin to minimize effect on t
C
Using the ISL88021_22EVAL1 Platform
The ISL88021_22EVAL1 board is designed to provide both
immediate functional assessment and flexibility to the user.
Both ICs are the ‘HF’ variant having a V
V2MON Vth of 3.09V and V3MON Vth of 0.6V. The top IC
position is the ISL88021 and is configured to monitor for
undervoltage (UV) compliance of a 5V, 3.3V and a 2.5V and
signaling the RESET and RESET outputs. The bottom
position is the ISL88022 variant, which is configured to
measure a 3.3V overvoltage (OV) in addition to UV on both
the 5V and 3.3V supplies. RESET and RESET is asserted for
at least t
cases V3MON interfaces with the monitored supply via a
simple resistor divider for comparison to the internal 0.6V
reference. A Manual Reset (MR) input is provided on both
ICs and is invoked by pulling this input LOW.
V
1.8V - 3.3V
POR
MON
3.3V - 5V
> 0.6V
pad is patterned, the t
FIGURE 3. TYPICAL APPLICATION DIAGRAM
POR
when these voltage go out of range. In both
POR
pin, reduce layout stray capacitance
V2MON
V3MON
V
ISL88021
ISL88022
DD
POR
GND
5
POR
can be 160ms.
C
RST
RST
POR
MR
timing. If no PCB
DD
Vth of 4.64V, a
POR
DD
PB
TO DISPLAY
and
. MR input
TO µP
ISL88021, ISL88022
RESET
SIGNAL
FIGURE 4. ISL88021_22EVAL1 SCHEMATIC AND PHOTO
FIGURE 5. ISL88022EVAL1 3.3V UV AND OV DETECTION
MONITORED VOLTAGE RISING AND FALLING RAMP
THROUGH THE PROGRAMMED UV AND OV THRESHOLDS
ISL88022IU8HFZ
ISL88021IU8HFZ
RESET# RESPONDING TO
MONITORED VOLTAGE. C
PIN IS OPEN, t
POR
September 18, 2006
= 150ms
FN8226.1
POR