了解直流电气特性的微控制器-Understanding DC

文章摘要：This parameter states the minimum high-output voltage on Port 0 and Port 2 pins and ALE and active-low PSEN is not less than 2.4V when addressing external memory and the microcontroller is sourcing a current of 8mA.PARAMETERSYMBOLMINTYPMAXUNITSNOTESInput Low Current Ports 1, 3 at 0.45VIIL-55µA

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


This parameter states the minimum high-output voltage on Port 0 and Port 2 pins and ALE and active-low PSEN is not less than 2.4V when addressing external memory and the microcontroller is sourcing a current of 8mA.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Input Low Current Ports 1, 3 at 0.45V	IIL			-55	µA	11

When the port pin is configured as an input, it is internally pulled to logic 1. Depending on the external load, the port pin sources current. In this case, a maximum current is sourced from the microcontroller port pins when the pin is loaded to an external voltage drop of 0.45V. When 0.45V is present at the port pin, a maximum current of 55µA flows from the pin.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Transition Current from 1 to 0 Ports 1, 3 at 2V	ITL			-650	µA	8

When the port pins switch states from logic 1 to logic 0, current flows out of the pins to the external load. The maximum current occurs at approximately 2V during the transition from VCC to 0V.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Input Leakage Port 0, Bus Mode	IL	-300		+300	µA	9

When port 0 is used as an address bus for an external device, a leakage current flows when the input voltage is between VCC and 0.45V. A weak holding latch is employed in Port 0 during bus mode. During the voltage transition, the port pins can either sink or source current. The peak current occurs at approximately 2V during the transition.

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
RST Pulldown Resistance	RRST	50		170	kΩ

The reset pin on the DS80C320 has an internal pulldown resistor. The minimum resistance is 50kΩ and the maximum resistance is 170kΩ. This allows the user to incorporate various wired-OR conditions for reset. On some versions of 8051-type microcontrollers, an external RC combination is required to implement a power-up reset. This function is provided internal to the DS80C320.

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