The oscillator con? The oscillator may be replaced by an external clock signal at input RS. The counter advances on the negative-going transition of RS. Ordering information Table 1. Functional diagram Fig 1.
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Manual zz. The oscillator configuration allows design of either RC or crystal oscillator circuits. The oscillator may be replaced by an external clock signal at input RS.
The counter advances on the negative-going transition of RS. Ordering information Table 1. All rights reserved. Pinning information 6. It cannot be used as supply pin or input. Fig 5. Timing diagram 8. Limiting values Table 3. Recommended operating conditions Table 4. Static characteristics Table 5. Dynamic characteristics Table 6. Fig 8.
Fig 9. Fig Waveforms showing the master reset MR pulse width, the master reset to output Qn propagation delays and the master reset to clock RS recovery time Table 7. Test circuit for measuring switching times Table 8. RC oscillator The function of R2 is to minimize the influence of the forward voltage across the input protection diodes on the frequency. The stray capacitance C2 should be kept as small as possible. In consideration of accuracy, Ct must be larger than the inherent stray capacitance.
For starting and maintaining oscillation a minimum transconductance is necessary, so R2 should not be too large. A practical value for R2 is 2. External component connection for a crystal oscillator Fig RC oscillator frequency as a function of Rt Fig A1 min. A2 max. Plastic or metal protrusions of 0. Plastic interlead protrusions of 0. Abbreviations Table 9.
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General description stage binary ripple counter with oscillator. HEFB 1. General description Hex inverting buffers. CBTA 1. General description stage binary ripple counter.
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CPCI RS232 Interface
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You can download the circuit diagram here. It is spread over two sheets, one sheet covers the time base and the seconds, minutes and hours counters. The other sheet covers the display circuit and the power supply. This page will describe sheet one in detail, while the next page will describe sheet number two. Together with this knowledge you should be able to build the clock yourself too. As usual, with such a one of project, I didn't bother to create a PCB for the project. Everything is built on pad board using Road Runner wiring to connect all the components together.