![](http://datasheet.mmic.net.cn/370000/TC1270A_datasheet_16735777/TC1270A_15.png)
2007 Microchip Technology Inc.
DS22035B-page 15
TC1270A/70AN/71A
3
3
—
3
3
MR
I
ST
(1)
Manual Reset input pin
This input allows a push button switch to be
directly connected to the
TC1270A/70AN/71A’s MR pin, which can then
be used to force a system Reset. The input fil-
ter (ignores) noise pulses that occur on the
MR pin.
H = Switch is open (internal pull-up resistor
pulls signal high). State of the RST/RST
pin determined by other system condi-
tions.
L = Switch is depressed (shorted to ground).
This forces the RST/RST pin Active.
2
4
—
2
4
V
DD
NC
—
Power
Supply Voltage
1
—
—
1
—
—
—
No Connection
TABLE 3-1:
PINOUT DESCRIPTION (CONTINUED)
Pin Number
Sym
Pin
Standard Function
TC1270A
(Push-Pull,
active low)
TC1270AN
(Open-Drain,
active low)
TC1271A
(Push-Pull,
active high)
S
S
S
S
S
Type
Buffer
/
Driver
Note 1:
The MR pin has an internal weak pull-up (18.5 k
Ω
typical).