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参数资料
| 型号： | LC78684NE |
| 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： | 16/24页 |
| 文件大小： | 177K |
| 代理商： | LC78684NE |
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
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. Latchup prevention
(1) The voltages stipulated in the specifications must be applied to the power supply pins. If there are multiple power
supply pins that are stipulated to have the same voltage, the identical potential must be applied to all those pins.
(2) The voltage levels on I/O pins must not exceed the peripheral 3 V system block supply voltage, and must not go
below the ground level.
(3) Design applications so that overvoltages and abnormal noise are not applied to this IC.
(4) 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.
(5) 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. Refer to
spec sheets and other documentation and design applications taking these concerns into account.
(2) This IC's output pin states, I/O settings, and register values are not guaranteed 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 either due
to long-term variations in a given device or due to design changes in later versions of the same product.
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 systems to provide adequate margin
for variations in ambient conditions.
No. 7695-23/24
LC78684NE
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相关代理商/技术参数 |
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