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参数资料
| 型号： | LC78648E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | 14 X 14 MM, QFP-80 |
| 文件页数： | 9/19页 |
| 文件大小： | 486K |
| 代理商： | LC78648E |
Application Design Notes
While it goes without saying that strictly observing the absolute maximum ratings and allowable operating ranges
(recommended operating conditions) for this IC is necessary for application reliability, careful consideration must also be
given to the ambient temperature, static discharge, and other environmental conditions as well as the mounting
conditions. This section presents notes regarding application design and circuit board mounting for this IC.
1. Handling unused pins
(1) If any unused input pins on this IC are left open, internal circuits may become unstable. The instructions on
handling unused pins for specific pins given in the technical documentation must be followed. Also note that
unused output pins must not be shorted to power, ground, or other outputs.
(2) If any I/O pin is not used, that pin must either be set to output mode or else set to input mode and the level held
fixed by pulling up or pulling down.
2. Latchup prevention
(1) The same potential must be supplied to all this IC's power supply pins.
(2) This IC may latch up if there is any timing discrepancy in power application between different power supply pins.
The power supply system must be designed so that there is no time discrepancy in power application.
(3) The pin voltage levels must follow the stipulations of the absolute maximum ratings and allowable operating
ranges. This requires special care when power is being applied.
(4) Design applications so that overvoltages and abnormal noise are not applied to this IC.
(5) In general, latchup can be prevented by holding unused input pins fixed at either VDD or VSS. However, the
handling of each pin must follow an specific instruction in the pin functions documentation.
(6) The outputs must not be shorted.
3. Interface
When connected to other devices, this IC may not operate correctly if the input VIL/VIH and output VOL/VOH
levels do not match. When connecting this IC to other devices in dual power supply systems, level shifters must be
inserted to prevent the device from being destroyed.
4. Load capacitance and output current
(1) When connected to high capacitance loads, lines may be melted since the effect of such loads is the same as the
load being shorted for an extended period. Also, large charge/discharge currents may result in noise that may
degrade equipment performance and cause malfunctions. The recommended load capacitance ratings must be
observed.
(2) Excessive output sink or source current can cause problems. Observe the maximum allowable power dissipation
ratings and use this IC within the recommended current value range.
5. Notes on power application and power-on reset
(1) There are cases where special care is required at power on, during a reset, and after a reset is cleared. Design
applications taking these concerns into account.
(2) This IC's output pin states, I/O settings, and register values are undefined when power is first applied. The operation
of items that are defined by a reset operation or mode settings is only guaranteed after the corresponding reset or
setting operation. A reset must be applied to this IC after power is first applied. The states immediately after power
on of pins and registers that are not explicitly defined cannot be relied on: they may differ in later versions of the
same product.
(3) The general-purpose I/O pins are set to input mode by a reset. Pulling up or pulling down each I/O pin with an
individual resistor is an effective and failsafe way to hold the input at either high or low after input mode is set up.
6. Notes on thermal design
The failure rate of semiconductor devices is accelerated greatly by increases in ambient temperature or power
consumption. To assure high reliability, design the application heat dissipation system to provide adequate margin for
variations in ambient conditions.
No. 7694 -17/19
LC78648E
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