TC1270A MICROCHIP [Microchip Technology], TC1270A Datasheet - Page 18

• Manufacturer Part Number: TC1270A
• Description: Voltage Supervisor with Manual Reset Input
• Manufacturer: MICROCHIP [Microchip Technology]

TC1270A/70AN/71A
FIGURE 4-4:
FIGURE 4-5:
FIGURE 4-6:
DS22035B-page 18
MR
MR
MR
+
–
+
–
+
–
Noise Filter
Noise Filter
Noise Filter
Comparator
Comparator
Comparator
Reference
Voltage
Reference
Voltage
Reference
Voltage
TC1270A Block Diagram.
TC1270AN Block Diagram.
TC1271A Block Diagram.
V
V
V
DD
DD
DD
(Open-
Output
(Push-
Output
Output
(Push-
Driver
Driver
Drain)
Delay
Delay
Driver
Delay
Pull)
Pull)
RST
RST
RST
V
SS
4.2
The Voltage Detect Circuit monitors V
Reset voltage trip point (V
device is ordered. The voltage on the device’s V
determines the output state of the RST/RST pin.
V
pin inactive. V
the RST/RST pin active. The state of the RST/RST pin
is unknown for V
V
TABLE 4-1:
The term V
trip point voltage where the device actually trips.
In the case where V
above V
• Voltages above V
• Voltages below V
Now in the case where V
starting below V
• Voltages above V
V
V
V
Legend: H = Driven High
Note 1:
DD
TRIP(MIN)
DD
TRIP(MIN)
DD
RST/RST output pin to be driven Active.
RST/RST output pin to be driven Active.
RST/RST output pin to be driven Inactive, (or
floated - TC1270AN) after the Reset Delay Timer
(t
RST
voltages above the V
≥ V
≤ V
V
2:
), times out.
DD
TRIP(MAX)
TRIP(MAX)
TRIP(MIN)
Voltage Detect Circuit
. This is shown in
TRIP
Voltage Level
< V
U = Unknown, driven either High or Low
The RST/RST pin will be driven inactive
after the Reset Delay Timer (t
out.
The TC1270AN RST pin will be floated
after the Reset Delay Timer (t
out.
DD
DD
will be used as the general term for the
TRIP(MIN)
DD
):
voltages below the V
V
OUTPUT STATES
< V
TRIP(MIN)
DD
TRIP(MAX)
TRIP(MAX)
voltages between V
DD
TRIP(MAX)
LEVELS TO RST/RST
© 2007 Microchip Technology Inc.
is falling (for voltages starting
):
TRIP(MAX)
TRIP
Table 4-1
DD
will always cause the
will never cause the
will always cause the
) is selected when the
is rising (for voltages
L = Driven Low
H
force the RST/RST
RST
Output State
(1, 2)
U
L
DD
TRIP(MIN)
. The device’s
TRIP(MAX)
RST
RST
) times
) times
RST
L
DD
U
H
(1)
force
and
pin