XC6120 TOREX [Torex Semiconductor], XC6120 Datasheet - Page 7

• Manufacturer Part Number: XC6120
• Description: Highly Accurate, Ultra Small, Low Power Consumption Voltage Detector
• Manufacturer: TOREX [Torex Semiconductor]

■NOTE ON USE
● Oscillation Description
1.
2.
3.
4.
5.
(1) Oscillation as a result of through current
Since the XC6120 series are CMOS ICs, transient through current will flow when the IC's internal circuit switching operates
regardless of output configuration. Consequently, oscillation is liable to occur as a result of the similar operations as in (1)
above. This oscillation does not occur during the detect operation.
(2) Output current oscillation with the CMOS output configuration
As shown in figure 2, when the voltage applied at the power supply (V
voltage, the IC commence release operations and the internal P-ch driver transistor will be on. The output current (I
the input resistor (R
voltage drops R
below the V
stop because the output current (I
become the same voltage level as the input voltage (V
therefore, the release operations will begin over again. Oscillation may occur with this repetition. Further, this condition will
also appear via means of a similar mechanism during detect operations.
Please use this IC within the stated maximum ratings. Operation beyond these limits may cause degrading or permanent
damage to the device.
In order to stabilize the IC's operations, please ensure that V
several μs / V.
With a resistor connected between the V
voltage at the detect and release voltage. Those errors are not constant because of the fluctuation of the supply current.
When a resistor is connected between the V
current and voltage drop at the R
in the CMOS output configurations, oscillation may occur regardless of detect/release operation if load current (I
exists. (refer to the Oscillation Description (2) below)
Please use N-ch open drains configuration, when a resistor R
V
DD
power source. In such cases, please ensure that R
DF
and detect operations will commerce so that the internal P-ch driver transistor will be off. The voltage drop will
IN
x I
[Figure 2: Oscillation caused by the input resistor of the CMOS output product and the output current]
IN
OUT
) via the P-ch driver transistor. Because of the input resistor (R
. If the voltage drop level is larger than the IC’s hysteresis width (V
OUT
IN
[Figure 1: Circuit connected with the input resistor]
) which was flowing the P-ch driver transistor will run down. The input pin voltage will
at the time of voltage release. (refer to the Oscillation Description (1) below ) Especially
IN
pin and the power supply V
IN
pin and the power supply V
IN
). For this, the input pin voltage will rise above the release voltage (V
IN
XC6120N
is less than 10kΩ and that C is more than 0.1μF.
IN
IN
XC6120C
pin's input frequency's rise and fall times are more than
is connected between the V
DD
) rises from below detect voltage to above release
DD
DD
some errors may be observed from the input
, oscillation may occur as a result of through
IN
) and the output current (I
HYS
), the input pin voltage will falls
IN
pin and the power supply
OUT
), an input pin
XC6120
OUT
Series
7/13
) flows
OUT
DR
)
),