FM1233B Fairchild Semiconductor, FM1233B Datasheet - Page 3

• Manufacturer Part Number: FM1233B
• Description: 3-Pin C Supervisor Circuit
• Manufacturer: Fairchild Semiconductor

FM1233B Rev. D
Pin Descriptions
Circuit Timing
When operating properly with 5V V
also be about 5V. When V
down as shown. When V
ground (“issues a RESET”) and stays there unless V
falls below its minimum operating voltage, approx. 1V. At this
point, the supervisor loses control, and its output may rise, only
to again follow V
CC
down to the ground.
Pin Number
CC
CC
drops below V
1
2
3
starts to fall, RESET will follow it
CC
GND
GND
3.3V
3.3V
(for example), RESET will
V
V
1V
1V
TH
TH
TH
, RESET drops to
Name
RESET
GND
V
CC
CC
GROUND
RESET remains LOW while V
at least 140ms after V
also
RESET
V
CC
3
When V
reached, whereupon the device regains control, RESET is
pulled to ground, etc. When V
comes out of RESET 140 ms later.
If it is required that a lower value than GND + 1.0V is needed
on RESET signal during V
on the device output to GND.
CC
begins to rise, RESET follows it until 1.0V or so is
Function
CC
rises above V
CC
140ms
(min)
is below V
CC
TH
1V, a 100K resistor may be used
.
CC
TH
, and for
rises above V
www.fairchildsemi.com
TH
, RESET