XC6136 Series
■NOTES ON USE
(1) Please use this IC within the stated maximum ratings. For temporary, transitional voltage drop or voltage rising phenomenon,
the IC is liable to malfunction should the ratings be exceeded.
(2) The power input pin voltage may fall due to the flow through current during IC operation and the resistance component
between the power supply and the power input pin.
In the case of CMOS output, a drop in the power input pin voltage may occur in the same way due to the output current. When
this happens, if the power input pin voltage drops below the minimum operating voltage, a malfunction may occur.
(3) Note that large, sharp changes of the power input pin voltage may lead to malfunction.
(4) Since the power supply noise may cause malfunction, please fully evaluate with an actual system. As necessary, please take
measures such as inserting a capacitor between VIN and VSS
.
(5) When an N-ch open drain output is used, the VRESETB voltage at detection and release is determined by the pull-up resistance
connected to the output pin. Refer to the following when selecting the resistance value.
At detection:
VRESETB = Vpull / (1 + Rpull / RON)
Vpull
RON
：Voltage after pull-up
(*1)
：ON resistance of N-ch driver M1 (calculated from VRESETB/IRBOUTN based on electrical characteristics)
Example: When VIN=2.0V(*2), RON = 0.3V / (4.1 × 10-3 A) ≒ 73.2Ω (MAX.)
If it is desired to make VRESETB at detection 0.1V or less when Vpull is 3.0V,
Rpull = { ( Vpull / VRESETB ) – 1 } × RON = { ( 3V / 0.1V ) – 1 } × 73.2Ω ≒ 2.1kΩ
Therefore, to make the output voltage at detection 0.1V or less under the above conditions, the pull-up resistance must be 2.1kΩ or higher.
(*1) Note that RON becomes larger as VIN becomes smaller.
(*2) For VIN in the calculation, use the lowest value of the input voltage range you will use.
At release:
VRESETB = Vpull / ( 1 + Rpull / Roff )
Vpull
Roff
：Voltage after pull-up
：Resistance when N-ch driver M1 is OFF (calculated from VRESETB/ILEAKN based on electrical characteristics)
Example: When Vpull is 6.0V, Roff = 6V / ( 0.1 × 10-6 A) = 60MΩ (MIN.).
If it is desired to make VRESETB 5.99V or higher,
R
pull = { ( Vpull / VRESETB ) – 1 } × Roff = { ( 6V / 5.99V ) – 1 } × 60 × 106Ω ≒ 100kΩ
Therefore, to make the output voltage at release 5.99V or higher under the above conditions, the pull-up resistance must be
100kΩ or less.
The above VRESETB voltage is an example calculation of Active Low products.
To calculate the VRESET voltage (Active High product), calculate by inverting the logic at detection and release.
(6) Torex places an importance on improving our products and their reliability. We request that users incorporate fail-safe designs
and post-aging protection treatment when using Torex products in their systems.
12/23
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