Datasheet > 88C55-AF5-R

88C55-AF5-R

更新时间： 2024-01-10 16:11:28

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描述
BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR

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88C55-AF5-R 技术参数

生命周期：	Active	Reach Compliance Code：	compliant
风险等级：	5.84

88C55-AF5-R 数据手册

88CXX

CMOS IC

ꢀ

OPERATION

1. Basic operation: CMOS active low output

(1) When power supply voltage V_DDis greater than the release voltage +V_DET, the Nch transistor is OFF and the

Pch transistor ON, causing V_DD(high) to appear at the output.

(2) When power supply voltage V_DDgoes below +V_DET, the output maintains the power supply voltage level, as

long as V_DDremains above the detection voltage -V_DET. When V_DDdoes fall below -V_DET(A in Figure 7), the Nch

transistor goes ON the Pch transistor goes OFF, and V_SSappears at the output.

(3) When V_DDfalls below the minimum operating voltage, the output becomes undefined. However, output will

revert to V_DDif a pull-up has been employed.

(4) V_SSwill again be output when V_DDrises above the minimum operating voltage. V_SSwill continue to be output

even when V_DDsurpasses -V_DET, as long as it does not exceed the release voltage +V_DET

(5) When V_DDrises above +V_DET(B in Figure 7), the Nch transistor goes OFF the Pch transistor goes ON, and V_DD

appears at the output. Then V_DDat the OUT terminal appears with delay time (td) due to delay circuit.

VDD

(1)

(2)

(3)

(4)

(5)

V^DD

Hysteresis

width(V^HYS)

Release voltage (+V^DET)

Detection voltage (-V^DET)

Pch

Nch

Delay

circuit

Min.operating voltage

V^ss

OUT

C^D

VREF

Vss

V^DD

*Parasitic diode

OUT terminal output

Vss

Figure 6

Figure 7

2. Delay circuit

The delay circuit outputs the signal delayed from the release voltage (+V_DET) point of the power voltage V_DD

rising. The output signal is not delayed when the V_DDgoes down the detection voltage (-V_DET) or less. (See Figure 7).

The delay time (td) is determined by the time constant of the built-in constant current (approx. 100nA in the case

of products with detection voltage of 1.5V or more, approx. 570nA in the case of products with detection voltage of

1.4V or less) and the attached external capacitor (C_D), and calculated from the following formula.

td (ms) = Delay factor×C_D(nF)

Delay factor: (25℃)

Products with detection voltage of 1.4V or less: Min.0.57, Typ.0.77, Max.0.96

Products with detection voltage of 1.5V or more: Min.3.8, Typ. 5.1, Max.6.4

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

QW-R502-040,A

1...6 7 8910 11 12...16

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