LC78684E データシートの表示（PDF） - SANYO -> Panasonic

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LC78684E

MP3 Decoder for Compact Disc Players

SANYO -> Panasonic 

LC78684E

Application Design Notes

While it goes without saying that strictly observing the absolute maximum ratings and allowable operating ranges

(recommended operation conditions) stipulated for this IC is necessary to achieve reliability of the overall system, it is also

necessary to take adequate care with respect to the mounting conditions and the operating environment, including the ambient

temperature and the possibility of electrostatic discharges (ESD). This section presents notes on aspects of design and

mounting that require special attention.

Handling Unused Pins

If this IC is operated with unused input pins left open, certain internal circuit operations may become unstable. Unused pins

that are mentioned in the IC documentation must be handled as specified. Also, do not allow output pins to come in contact

with any circuit lines, including power supply lines, ground lines, or other outputs.

Latchup Prevention

x The voltages stipulated in the IC specifications must be provided to the corresponding power supply pins. When the same

voltage is stipulated for multiple pins, those pins all must be connected to the same potential.

x Do not set I/O voltage levels to be either higher than the peripheral 3 V system block voltage, or lower than the ground

level. This relationship must also be maintained during the power-on sequence.

x Do not apply overvoltages or abnormal noise to this IC.

x While in general, latchup is prevented by holding unused input pins at either the VDD or VSS potential, input pins to this IC

must be handled as described in the pin descriptions.

x Do not short the outputs.

Interface

Incorrect operation may result when different devices are connected if the input VIL/VIH and the output VOH and VOH

levels do not match. Level shifters must be inserted between devices with differing supply voltages, such as those often used

in dual power supply systems, to prevent destruction of the devices.

Load Capacitance and Output Current

x If a large load capacitance is connected, the resulting effective short of the outputs may continue for an extended period and

lead to fusing of lines. Also, larger charge and discharge currents can cause noise, degrade device performance, and cause

incorrect operation. The recommended load capacitance ratings must be observed.

x Excessive output sink or source currents can lead to the same problems described in the preceding item. Once the allowable

power dissipation rating has been met, the recommended current values must be observed as well.

Notes on Power Application and Reset

x There are several aspects that require care when power is first applied, during a reset, and when the reset state is cleared.

Refer to the device specifications and design applications to match the product specifications.

x In this IC, the register contents, pin output states, and pin I/O settings are not guaranteed after power is first applied. Items

that are defined by the reset operation or mode setting operations are guaranteed after these operations are performed. After

power is first applied to this IC, the application must first perform a reset operation. Pin states and register values that are

not defined are subject to change, both due to sample-to-sample variations in the product over the long term, and due to

changes in device design from the initial design states.

Thermal Design

x Semiconductor device failure rates are greatly accelerated by inappropriate ambient temperature and power consumption

conditions. To assure the highest possible reliability, the thermal design should provide ample margins considering all

possible changes in the ambient conditions.

No.7350-20/21

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