LC87FBH08A
www.onsemi.com
31
Figure 7 Waveform observed when only POR is used (LVD not used)
(RESET pin: Pull-up resistor R
RES
only)
The POR function generates a reset only when power is turned on starting at the V
SS
level.
No stable reset will be generated if power is turned on again when the power level does not go down to the V
SS
level
as shown in (a). If such a case is anticipated, use the LVD function together with the POR function or implement an
external reset circuit.
A reset is generated only when the power level goes down to the V
SS
level as shown in (b) and power is turned on
again after this condition continues for 100s or longer.
Figure 8 Waveform observed when both POR and LVD functions are used
(RESET pin: Pull-up resistor R
RES
only)
Resets are generated both when power is turned on and when the power level lowers.
A hysteresis width (LVHYS) is provided to prevent the repetitions of reset release and entry cycles near the detection
level.
POR release voltage
(
PORRL
)
V
DD
RES
Unknown-state
(
POUKS
)
(a)
(b)
Reset period
Reset period
100s or longer
V
DD
RES
LVD hysteresis width
(LVHYS)
Unknown-state
(
LVUKS
)
Reset period
Reset period
Reset period
LVD release voltage
(LVDET+LVHYS)
LVD reset voltage
(LVDET)
LC87FBH08A
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32
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Figure 9 Low voltage detection minimum width
(Example of momentary power loss/Voltage variation waveform)
ORDERING INFORMATION
Device Package Shipping (Qty / Packing)
LC87FBH08AU-EB-3H
LQFP36 7x7 / QFP36
(Pb-Free / Halogen Free)
500 / Tray Foam
LC87FBH08AU-EB-NH
LQFP36 7x7 / QFP36
(Pb-Free / Halogen Free)
1000 / Tape & Reel
† For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel
Packaging Specifications Brochure, BRD8011/D. http://www.onsemi.com/pub_link/Collateral/BRD8011-D.PDF
V
DD
LVD reset voltage
TLVDW
V
SS
LVD release voltage
LVDET-0.5V

LC87FBH08AU-EB-NH

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
8-bit Microcontrollers - MCU 8-BIT MICROCONTROLLER
Lifecycle:
New from this manufacturer.
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