12/26
XC6121/XC6122/XC6123/XC6124
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. When a resistor is connected between the V
IN pin and the input, the VIN voltage drops while the IC is operating and a
malfunction may occur as a result of the IC’s through current.
3. In order to stabilize the IC’s operations, please ensure that the V
IN pin’s input frequency’s rise and fall times are more than
1 μ s/V.
4. Noise at the power supply may cause a malfunction of the watchdog operation or the voltage detector. In such case,
please strength V
IN and GND lines. Also, please connect a capacitor such as 0.22μF between the VIN pin and the GND pin
and evaluate the device on the actual board carefully before use.
5. Protecting against a malfunction while the watchdog time out period, an ignoring time (no reaction time) occurs to the rise
and fall times. Referring to the figure below, the ignoring time (no reaction time) lasts for 900μs at maximum. (refer to the
Figure1 below)
6. The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the V
EN
pin
in high level. The EN pin of the XC6122 series is internally pulled up. The watchdog function can be used even the EN
pin left open. The ENB pin of the XC6123 series is not internally pulled down. When using the watchdog function,
please drive the V
ENB
pin in low level. The ENB pin of the XC6124 series is internally pulled down. The watchdog function
can be used even the ENB pin left open.
7.
Torex places an importance on improving our products and its reliability.
However, by any possibility, we would request user fail-safe design and post-aging treatment on system or equipment.
[Figure1]
