UC1823A,UC2823A, UC2823B,

UC3823A,UC3823B,UC1825A,

UC2825A,UC2825B,UC3825A,UC3825B

SLUS334D − AUGUST 1995 − REVISED NOVEMBER 2008

www.ti.com

9

CONTROL METHODS

UDG−95109

UDG−95110

Current Mode

Voltage Mode

.

Figure 8. Control Methods

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 9. General Oscillator Synchronization

UDG−95111

UDG−95113

Figure 10. Two Unit Interface

UDG−95112

Figure 11. Operational Waveforms