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Arithmetic Logic Functions | MC14541B
概览
MC14541B 可编程计时器包括一个 16 级二进制计数器、用于外部电容器和两个电阻的集成振荡器、自动通电重置电路，以及输出控制逻辑。计时通过打开电源初始化，此时在规定的 VDD 范围内启用通电重置并初始化计数器。电源导通时，可以应用外部重置脉冲。发出初始重置命令时，振荡器将以外部 RC 网络确定的频率进行振荡。该 16 级计数器将振荡器频率 (focs) 除以第 n 级频率等于 fosc/2n。
- Available Outputs 28, 210, 213 or 216
- Increments on Positive Edge Clock Transitions
- Built-in Low Power RC Oscillator (+/- 2% accuracy over temperature range and +/- 20% supply and +/- 3% over processing at < 10 kHz)
- Oscillator May Be Bypassed if External Clock Is Available (Apply external clock to Pin 3)
- External Master Reset Totally Independent of Automatic Reset Operation
- Operates as 2n Frequency Divider or Single Transition Timer
- Q/Qbar Select Provides Output Logic Level Flexibility
- Reset (auto or master) Disables Oscillator During Resetting to Provide No Active Power Dissapation
- Clock Conditioning Circuit Permits Operation with Very Slow Clock Rise and Fall Times
- Automatic Reset Initializes All Counters On Power Up
- Supply Voltage Range = 3.0 Vdc to 18 Vdc with Auto Reset Disabled (Pin 5 = VDD)
8.5 Vdc to 18 Vdc with Auto Reset Enabled (Pin 5 = VSS) - Pb-Free Packages are Available*
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