TC1270ATVRCTR Microchip Technology, TC1270ATVRCTR Datasheet - Page 19

• Manufacturer Part Number: TC1270ATVRCTR
• Description: IC,Power Supply Supervisor,TO-253,4PIN,PLASTIC
• Manufacturer: Microchip Technology
• Type: Simple Reset/Power-On Resetr

Specifications of TC1270ATVRCTR

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 3.08V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-143, SOT-143B, TO-253AA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.0
4.1
For many of today’s microcontroller applications, care
must be taken to prevent low-power conditions that can
cause many different system problems. The most
common causes are brown-out conditions, where the
system supply drops below the operating level
momentarily. The second most common cause is when
a
microcontroller to begin executing instructions without
sufficient voltage to sustain volatile memory (RAM),
thus producing indeterminate results.
The TC127XA family (TC1270A, TC1270AN, and
TC1271A)
devices designed to keep a microcontroller in Reset
until the system voltage has reached and stabilized at
the proper level for reliable system operation. These
devices also operate as protection from brown-out
conditions when the system supply voltage drops
below a safe operating level.
A Manual Reset input (MR pin) is provided. This allows
a push button switch to be directly connected to the
TC127XA device, and is suitable for use as a push
button Reset. This allows the system to easily be reset
from the external control of the push button switch. No
external components are required.
The Reset pin (RST or RST) will be forced active, if any
of the following occur:
• During device power up
• V
• The Manual Reset input (MR) goes low
Figure 4-1
devices. The device can be described with three
functional blocks. These are:
• Voltage detect circuit
• Manual Reset with glitch filter circuit
• Reset generator circuit
The Reset generator circuit controls the reset delay
time of the reset output signal.
There are three Reset Delay Timer options. Depending
on the option, the Reset signal (RST/RST pin) will be
held active for a minimum of 1.09 ms, 17.5 ms, or
140 ms.
The TC1271A has an active-high RST output while the
TC1270A and TC1270AN have an active-low RST
output.
The TC1270A and TC1271A have a push-pull output
driver, while the TC1270AN has an open-drain output.
 2010 Microchip Technology Inc.
slowly
DD
goes below the device threshold voltage
DEVICE OPERATION
General Description
shows a high level block diagram of the
decaying
are
cost-effective
power
supply
voltage
causes
supervisor
the
Figure 4-2
and
device.
FIGURE 4-1:
Diagram.
FIGURE 4-2:
Application Circuit.
FIGURE 4-3:
Application Circuit.
The TC1270A and TC1271A devices are available in a
4-Pin
compatibility with the TC1270, TC1271, TCM811, and
TCM812 devices) and a SOT-23-5 package. The
TC1270AN is only available in the SOT-23-5 package.
Low supply current makes these devices suitable for
battery-powered applications.
Device specific block diagrams are presented in
Figure 4-4
V
MR
DD
TC1270A/70AN/71A
V
V
Figure 4-3
DD
0.1 µF
DD
Button
0.1 µF
Button
Push
Push
SOT-143
Manual Reset
Filter Circuit
with Glitch
shows a typical circuit for a push-pull device
through
Voltage
Detect
Circuit
shows a typical circuit for an open-drain
TC1270A/1A
MR
MR
TC1270AN
package
Figure
V
V
V
V
DD
SS
DD
SS
TC127XA High Level Block
Typical Push-Pull
Typical Open-Drain
RST
RST
RST
VRST
MRRST
or
4-6.
(to
maintain
Generator
DS22035C-page 19
Circuit
Reset
Reset Input
Reset Input
V
V
V
V
DD
SS
DD
SS
footprint
RST
or
RST