ZHCSQX4F August 1995 – August 2022 UC1823A , UC1825A , UC2823A , UC2823B , UC2825A , UC2825B , UC3823A , UC3823B , UC3825A , UC3825B
PRODUCTION DATA
7.5 SYNCHRONIZATION
The oscillator can be synchronized by an external pulse inserted in series with the timing capacitor. Program the free running frequency of the oscillator to be 10% to 15% slower than the desired synchronous frequency. The pulse width should be greater than 10 ns and less than half the discharge time of the oscillator. The rising edge of the CLK/LEB pin can be used to generate a synchronizing pulse for other chips. Note that the CLK/LEB pin no longer accepts an incoming synchronizing signal.
Figure 7-6 General Oscillator Synchronization
Figure 7-7 Two Unit Interface
Figure 7-8 Operational Waveforms