MCP1321T-29LE/OT Microchip Technology, MCP1321T-29LE/OT Datasheet - Page 29

• Manufacturer Part Number: MCP1321T-29LE/OT
• Description: IC SUPERVISOR 2.9V OD/PP SOT23-5
• Manufacturer: Microchip Technology
• Type: Simple Reset/Power-On Resetr

Specifications of MCP1321T-29LE/OT

• Number Of Voltages Monitored: 1
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Output: Open Drain, Push-Pull
• Reset: Active High/Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.9V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Output Type: Active High or Active Low or Open Drain or Push-Pull
• Power Fail Detection: No
• Monitored Voltage: 2 V to 4.7 V
• Undervoltage Threshold: 2.857 V
• Overvoltage Threshold: 2.944 V
• Manual Reset: Resettable
• Watchdog: Yes
• Battery Backup Switching: No
• Power-up Reset Delay (typ): 2240 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 10 uA
• Maximum Power Dissipation: 240 mW
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Input Voltage: 5.5V
• No. Of Outputs: 1
• Power Dissipation Pd: 240mW
• Supply Voltage Range: 1V To 5.5V
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +125°C
• Filter Terminals: SMD
• Supply Voltage Min: 1V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP1321T-29LE/OT; MCP1321T-29LE/OTTR

4.3
The minimum pulse width (time) required to cause a
Reset may be an important criteria in the implementa-
tion of a Power-on Reset (POR) circuit. This time is
referred to as transient duration. The MCP131X/2X
devices are designed to reject a level of negative-going
transients (glitches) on the power supply line.
Transient duration is the amount of time needed for
these supervisory devices to respond to a drop in V
The transient duration time (t
magnitude of V
of duration and overdrive that lies under the duration/
overdrive curve will not generate a Reset signal. Gen-
erally speaking, the transient duration time decreases
with and increases in the V
nations of duration and overdrive that lies above the
duration/overdrive curve are detected as a brown-out
or power-down condition.
Figure 4-16
Reset comparator overdrive, for which the MCP131X/
2X will not generate a Reset pulse. It shows that the far-
ther below the trip point the transient pulse goes, the
duration of the pulse required to cause a Reset gets
shorter.
characteristics for the MCP131X/2X.
Transient immunity can be improved by adding a
bypass capacitor (typically 0.1 µF) as close as possible
to the V
FIGURE 4-16:
Transient Duration Waveform.
© 2007 Microchip Technology Inc.
5V
0V
DD
Negative Going V
Figure 4-16
pin of the MCP131X/2X device.
shows a typical transient duration vs.
TRIP
– V
Time (µs)
shows the transient response
Example of Typical
DD
(overdrive). Any combination
TRIP
(Duration)
t
V
(Overdrive)
TRAN
TRANS
TRIP(MIN)
– V
DD
) is dependant on the
Transients
DD
- V
voltage. Combi-
DD
V
V
TRIP(MAX)
TRIP(MIN)
DD
.
4.4
The Manual Reset input pin (MR) allows the Reset pins
(RST/RST) to be manually forced to their active states.
The MR pin has circuitry to filter noise pulses that may
be present on the pin.
gram for using the MCP131X/2X with a push button
switch. To minimize the required external components,
the MR input has an internal pull-up resistor.
A mechanical push button or active logic signal can
drive the MR input.
Once MR has been low for a time, t
Reset delay time), the Reset output pins are forced
active. The Reset output pins will remain in their active
states for the Reset delay timer time out period (t
Figure 4-18
switch input and the Reset pins output.
FIGURE 4-17:
Watchdog Timer.
FIGURE 4-18:
4.4.1
The noise filter filters out noise spikes (glitches) on the
Manual Reset pin (MR). Noise spikes less than 100 ns
(typical) are filtered.
MR
RST
RST
The MR input typically ignores input pulses
of 100 ns.
Manual Reset Input
NOISE FILTER
V
shows a waveform for the Manual Reset
IL
MR
t
MRD
MCP13XX
V
+5V
V
DD
MCP131X/2X
t
SS
MR
Push Button Reset and
MR Input – Push Button.
Figure 4-17
RST
WDI
V
shows a block dia-
I/O
MCLR
IH
DS21985B-page 29
t
MRD
RST
PIC
®
(the Manual
MCU
R
ST
)