7480 datasheet(217/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

2-2

APPLICATIONS

2.1 Input/Output Pins

(1)

External Circuit Example for Output Ports

POINT: The following currents and voltages must be within specifications in the recommended operating

conditions when external circuits for I/O ports are designed.

For Input Ports

Input voltage

Input current

For Output Ports

Output sum currents

Output peak current

Output average current

For the recommended operating conditions, refer to Section 1.21 Electrical Characteristics.

Note:

When a key matrix is used for multi-key inputs, take account of the total current which results

from multiple inputs and is input to one port.

Figure 2.1.1 shows an external circuitry for output ports.

Figure 2.1.1 External Circuit for Output Ports

2.1 Input/Output Pins

• LOW output sum current

• LOW output peak current

• LOW output average current (in a period of 100 ms) (Note 2)

IOL0 + IOL1 + IOL2 = 36 mA < 60 mA

IOL0 = IOL1 = IOL2 = 12 mA < 20 mA

= 6 mA < 10 mA

12 mA

× 10 ms × 5

100 ms

VCC=5 V

7480 Group

7481 Group

P02

IOL2=12 mA

R2=250

Ω

P01

IOL1=12 mA

R1=250

Ω

P00

IOL0=12 mA

R0=250

Ω

(Note 1)

Shaded areas: Maximum ratings

10 ms

Turned on for 10 ms, five times in a 100-ms period.

Notes 1: LED (VF = 2 V) used.

2: Turn-on timing of LEDs connected to port pins P00, P01 and P02 (50% duty cycle).

(Note 1)

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