TC1270A Datasheet, PDF (14/40 Pages) Microchip Technology – Voltage Supervisor with Manual Reset Input

TC1270A/70AN/71A
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PINOUT DESCRIPTION
Pin Number
TC1270A TC1270AN TC1271A
(Push-Pull, (Open-Drain, (Push-Pull,
active low) active low) active high)
Sym
Pin
Standard Function
Buffer
Type /
Driver
5
1
4
2
5
1
V_{SS — Power Ground}
—
— — RST O Push- Reset output (Push Pull), active low
Pull H = V_DD > V_TRIP, Reset pin is inactive
(after Reset Timer Delay completes)
L = V_DD < V_TRIP, Reset pin is active
Goes active (Low) if one of these conditions
occurs:
1. If V_DD falls below the selected Reset
voltage threshold.
2. If the MR pin is forced low.
3. During power-up.
——
4
— — RST O Open- Reset output (Open-Drain), active low
Drain Float = V_DD > V_TRIP, Reset pin is inactive
(after Reset Timer Delay completes)
L = V_DD < V_TRIP, Reset pin is active
——
—
Goes active (Low) if one of these conditions
occurs:
1. If V_DD falls below the selected Reset
voltage threshold.
2. If the MR pin is forced low.
3. During power-up.
4
2 RST O Push- Reset output (Push Pull), active high
Pull H = V_DD < V_TRIP, Reset pin is active
L = V_DD > V_TRIP, Reset pin is inactive
(after Reset Timer Delay completes)
Note 1:
Goes active (High) if one of these conditions
occurs:
1. If V_DD falls below the selected Reset
voltage threshold.
2. If the MR pin is forced low.
3. During power-up.
The MR pin has an internal weak pull-up (18.5 kΩ typical).
DS22035B-page 14
© 2007 Microchip Technology Inc.