7480 datasheet(218/337 Pages) RENESAS

Part #	7480

Description	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	337 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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218 / 337 page

7480 Group and 7481 Group User's Manual

2-3

APPLICATIONS

(2)

Simplifying External Circuit Example by Using Level Shift Port and Noise Margin

POINT:

Ports P4 and P5 have N-channel open-drain outputs. Built-in clamping diodes allow voltages

VCC or more to be applied to port pins when the current for a pin is 1 mA or less.

Voltages VIL = 0.4 VCC and VIH = 0.8 VCC can be applied to ports P3, P4, and P5 (at VCC

= 4.5 V 5.5 V).

Figure 2.1.2 shows a simplified external circuit example by using a level shift port and noise margin.

2.1 Input/Output Pins

Figure 2.1.2 Simplified External Circuit Example by Using Level Shift Port and Noise Margin

7480 Group

7481 Group

The former hardware

12 V power source (VCC)

VIL

Port

VIL = SW ground voltage level (Max.) + VF (Max.)

= 1.0 [V] + 1.0 [V]

= 2.0 [V] (Max.)

≤ 0.4 VCC

5 V power source

7480 Group

7481 Group

12 V power source (VCC)

Port

Hardware using

level shift port

Ground voltage level

Max. 1.0 V

7480 Datasheet(PDF) 218 Page - Renesas Technology Corp