TC1270ATVRCTR Microchip Technology, TC1270ATVRCTR Datasheet - Page 24

• 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

TC1270A/70AN/71A
4.5
The output signals from the voltage detect circuit and
the manual Reset with glitch filter circuit are OR’d
together and used to activate the Reset generator
module.
After the Reset conditions have been removed (the MR
pin is no longer forced low and the input voltage is
greater than the trip point voltage), the Reset generator
circuit determines the Reset delay time out required.
There are three options for the delay circuit. These are:
• 2.19 ms (typical) delay
• 35 ms (typical) delay
• 280 ms (typical) delay
4.5.1
The Reset Delay Timer ensures that the TC127XA
device will “hold” the embedded system in Reset until
the system voltage has stabilized. The Reset Delay
Timer time out is shown in
The Reset Delay Timer starts when the voltage detect
circuit output AND the manual Reset with glitch filter
circuit output become inactive. While the Reset Delay
Timer is active, the RST or RST pin is driven to the
active state. When the Reset Delay Timer times out,
the RST or RST pin is driven inactive.
The Reset Delay Timer (t
voltage rises above the “actual” trip point (V
When the Reset Delay Timer times out, the Reset out-
put pin (RST/RST) is driven inactive.
The Reset Delay Timer is cleared if either, or both, the
voltage detector circuit output and the manual Reset
with glitch filter circuit output become active. The RST
or RST pin continues to be driven to the active state.
Figure 4-12
(t
DS22035C-page 24
RST
) is active or inactive.
Reset Generator Circuit
RESET DELAY TIMER
illustrates when the Reset Delay Timer
RST
Table
) starts after the device
4-4.
TRIP
).
4.5.2
The Reset Delay Timer time out period (t
determines how long the device remains in the Reset
condition. This time out is affected by the device V
and the temperature. Typical responses for varying
V
Figures 2-28,
TABLE 4-4:
FIGURE 4-12:
Waveform.
Note 1:
V
RST
minimum time that
DD
rises above V
the Reset Delay
DD
Timer will “hold”
active after V
the Reset pin
This is the
V
values and temperatures are presented in
TRIP
1.09
17.5
Min
140

See
Shaded rows are custom-ordered time
outs.
EFFECT OF TEMPERATURE ON
RESET POWER-UP TIMER (t
Reset Delay
Timer Inactive
2-7
2-29
Figures
TRIP
DD
and
RESET DELAY TIMER
TIME OUTS
and 2-30.
See
2-8
t
2.19
Typ
280
RST
Reset Power-up Timer
35
2-9,
 2010 Microchip Technology Inc.
Figures
maximum time that
rises above V
the Reset Delay
Timer will “hold”
active after V
the Reset pin
This is the
2-12,
t
RST
Max
4.38
560
70

See
2-11
2-7
Reset
Delay
Timer
Inactive
Figures
TRIP
DD
and
and
RPU
2-8
2-10
Units
)
ms
ms
ms
2-9,
RST
DD
)