R5F104LED datasheet(212/213 Pages) RENESAS

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NOTES FOR CMOS DEVICES

(1) VOLTAGE APPLICATION WAVEFORM AT INPUT PIN:

Waveform distortion due to input noise or a

reflected wave may cause malfunction.

If the input of the CMOS device stays in the area between VIL

(MAX) and VIH (MIN) due to noise, etc., the device may malfunction.

Take care to prevent chattering noise

from entering the device when the input level is fixed, and also in the transition period when the input level

passes through the area between VIL (MAX) and VIH (MIN).

(2) HANDLING OF UNUSED INPUT PINS:

Unconnected CMOS device inputs can be cause of malfunction.

an input pin is unconnected, it is possible that an internal input level may be generated due to noise, etc.,

causing malfunction.

CMOS devices behave differently than Bipolar or NMOS devices.

Input levels of

CMOS devices must be fixed high or low by using pull-up or pull-down circuitry.

Each unused pin should be

connected to VDD or GND via a resistor if there is a possibility that it will be an output pin.

All handling

related to unused pins must be judged separately for each device and according to related specifications

governing the device.

(3) PRECAUTION AGAINST ESD:

A strong electric field, when exposed to a MOS device, can cause

destruction of the gate oxide and ultimately degrade the device operation.

Steps must be taken to stop

generation of static electricity as much as possible, and quickly dissipate it when it has occurred.

Environmental control must be adequate.

When it is dry, a humidifier should be used.

It is recommended

to avoid using insulators that easily build up static electricity.

Semiconductor devices must be stored and

transported in an anti-static container, static shielding bag or conductive material.

All test and measurement

tools including work benches and floors should be grounded.

The operator should be grounded using a wrist

strap.

Semiconductor devices must not be touched with bare hands.

Similar precautions need to be taken

for PW boards with mounted semiconductor devices.

(4) STATUS BEFORE INITIALIZATION:

Power-on does not necessarily define the initial status of a MOS

device.

Immediately after the power source is turned ON, devices with reset functions have not yet been

initialized.

Hence, power-on does not guarantee output pin levels, I/O settings or contents of registers.

device is not initialized until the reset signal is received.

A reset operation must be executed immediately

after power-on for devices with reset functions.

(5) POWER ON/OFF SEQUENCE:

In the case of a device that uses different power supplies for the internal

operation and external interface, as a rule, switch on the external power supply after switching on the internal

power supply.

When switching the power supply off, as a rule, switch off the external power supply and then

the internal power supply.

Use of the reverse power on/off sequences may result in the application of an

overvoltage to the internal elements of the device, causing malfunction and degradation of internal elements

due to the passage of an abnormal current.

The correct power on/off sequence must be judged separately

for each device and according to related specifications governing the device.

(6) INPUT OF SIGNAL DURING POWER OFF STATE :

Do not input signals or an I/O pull-up power supply

while the device is not powered.

The current injection that results from input of such a signal or I/O pull-up

power supply may cause malfunction and the abnormal current that passes in the device at this time may

cause degradation of internal elements.

Input of signals during the power off state must be judged

separately for each device and according to related specifications governing the device.

R5F104LED 数据表(PDF) 212 Page - Renesas Technology Corp

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