了解直流电气特性的微控制器-Understanding DC

文章摘要：The input low level is the voltage range for all input pins at a logic level low. Notice the minimum voltage is -0.3V. Because the DS80C320 is powered by +VCC and referenced to ground, negative voltages in access of -0.3V can cause unreliable operation of the microcontroller or worse yet, damage the

了解直流电气特性的微控制器-Understanding DC,标签：计算机控制技术,工厂电气控制技术,http://www.88dzw.com


The input low level is the voltage range for all input pins at a logic level low. Notice the minimum voltage is -0.3V. Because the DS80C320 is powered by +VCC and referenced to ground, negative voltages in access of -0.3V can cause unreliable operation of the microcontroller or worse yet, damage the device. Voltages greater than +0.8V can be interpreted as an undefined state or logic level high.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Input High Level (Except XTAL1 and RST)	VIH1	2.0		VCC+0.3	V	1

The input high level is the voltage range for all input pins except XTAL1 and RST at logic level high. Voltages less than the minimum stated value can be interpreted as an undefined state or logic level low and voltages exceeding the maximum value, VCC + 0.3V can cause damage to the microcontroller.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Input High Level, XTAL1 and RST	VIH2	3.5		VCC+0.3	V	1

This parameter is specific to the XTAL1 and RST pins. Notice the minimum voltage is higher for these two pins as compared to the other pins on the microcontroller. This was done to improve the noise immunity for the XTAL1 and RST pins as compared to the rest of the pins on the device. If the maximum voltage is exceeded, the microcontroller can be damaged.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Output Low Voltage Ports 1, 3 at IOL = 1.6mA	VOL1			0.45	V	1

When the pins associated with Ports 1 and 3 are at a logic low state, they sink current from an external source. The source could be the input of a logic gate or a device such as a pullup resistor. This parameter states the voltage measured at the port pin is no more than 0.45V when sinking 1.6mA.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Output Low Voltage Ports 0, 2, ALE, active-low PSEN at IOL = 3.2mA	VOL2			0.45	V	1, 5

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