TC1301B Microchip Technology, TC1301B Datasheet - Page 15

• Manufacturer Part Number: TC1301B
• Description: Dual LDO
• Manufacturer: Microchip Technology

www.DataSheet4U.com
5.10
V
the TC1301A. Figure 5-1 is used to define the wake-up
time from shutdown (t
wake-up time is dependant upon the frequency of
operation. The faster the SHDN pin is pulsed, the
shorter the wake-up time will be.
FIGURE 5-1:
5.11
For the TC1301B, the SHDN1 input pin is used to
control V
V
FIGURE 5-2:
© 2005 Microchip Technology Inc.
OUT1
OUT2
V
SHDN2
V
V
V
SHDN1
V
, independent of the logic input on SHDN1.
SHDN2
will rise independent of the level of SHDN2 for
IN
OUT1
OUT2
V
IN
OUT1
OUT2
TC1301A SHDN2 Timing
TC1301B SHDN1 / SHDN2 Timing
OUT1
. The SHDN2 input pin is used to control
t
t
wk
wk
WK
t
TC1301A Timing.
s
TC1301B Timing.
t
s
) and the settling time (t
S
). The
5.12
The TC1301A/B integrates an independent voltage
reset monitor that can be used for low-battery input
voltage detection or a microprocessor Power-On Reset
(POR) function. The input voltage for the detector is
different for the TC1301A than it is for the TC1301B.
For the TC1301A, the input voltage to the detector is
pin 8 (V
detector is internally connected to the output of LDO #1
(V
to an internal threshold. When the voltage on the V
pin is below the threshold voltage, the RESET output
pin is low. When the voltage on the V
above the voltage threshold, the RESET output will
remain low for typically 300 ms (RESET time-out
period). After the RESET time-out period, the RESET
output voltage will transition from the low output state
to the high output state if the detected voltage pin
remains above the threshold voltage.
The RESET output will be driven low within 180 µs of
V
RESET output will remain valid for detected voltages
greater than 1.2V overtemperature.
5.13
Figure 5-3 shows the RESET timing waveforms for the
TC1301A. This diagram is also used to define the
RESET active time-out period (t
RESET delay time (t
FIGURE 5-3:
DET
OUT1
1V
V
going below the RESET voltage threshold. The
V
RESET
DET
). The detected voltage is sensed and compared
DET
TH
V
TC1301A RESET Timing
DET
). For the TC1301B, the input voltage to the
and RESET Operation
RESET Time
RPD
TC1301A RESET Timing.
).
TC1301A/B
V
OH
RPU
DS21798B-page 15
) and the V
DET
V
pin rises
OL
T
RPD
DET
DET