MCP1321T-29LE/OT Microchip Technology, MCP1321T-29LE/OT Datasheet - Page 33

• 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

5.7
Some microcontrollers have bidirectional Reset pins.
Depending on the current drive capability of the control-
ler pin, an indeterminate logic level may result if there
is a logic conflict. This can be avoided by adding a
4.7 kΩ resistor in series with the output of the
MCP131X/2X
nents in the system that require a Reset signal, they
should be buffered so as not to load the Reset line. If
the other components are required to follow the Reset
I/O of the microcontroller, the buffer should be con-
nected as shown with the solid line.
FIGURE 5-7:
2X Push-Pull outputs to a Bidirectional Reset I/O.
© 2007 Microchip Technology Inc.
MCP13XX
V
DD
GND
RST
Controllers and Processors With
Bidirectional I/O Pins
(Figure
4.7 kΩ
5-7). If there are other compo-
Interfacing the MCP131X/
Buffer
MCLR
GND
PIC
MCU
®
Buffered Reset
To Other System
Components
5.8
The MCP131X/2X Reset output is valid to V
Below this 1.0V, the output becomes an "open circuit"
and does not sink or source current. This means
CMOS logic inputs to the microcontroller will be floating
at an undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where the Reset signal must be
maintained valid to V
required.
For devices where the Reset signal is active-low, a pull-
down resistor must be connected from the MCP131X/
2X Reset pin(s) to ground to discharge stray capaci-
tances and hold the output low
Similarly for devices where the Reset signal is active-
high, a pull-up resistor to V
valid high Reset signal for V
This resistor value, though not critical, should be
chosen such that it does not appreciably load the Reset
pin(s) under normal operation (100 kΩ will be suitable
for most applications).
FIGURE 5-8:
Reset pin output state as V
RESET Signal Integrity During
Power-Down
MCP13XX
GND
V
V
DD
DD
MCP131X/2X
RST
Ensuring a valid active-low
DD
= 0V, external circuitry is
DD
DD
DD
is required to ensure a
(Figure
below 1.0V.
approaches 0V.
R
100 kΩ
1
DS21985B-page 33
5-8).
DD
= 1.0V.