FUNCTIONAL DESCRIPTION
The DDU39F-series device is a mechanically variable, FAST-TTL interfaced delay line.
The signal input (IN) is reproduced at the tap output (OUT), shifted by an amount which can be adjusted between 7ns and 25ns.
The device operates from a single 5V supply and is TTL interfaced, capable of driving up to 10 TTL loads.

FEATURES
*Ideal for “Set and Forget” applications
*Multi-turn adjustment screw (approx. 15 turns)
*Fits standard 16-pin DIP socket
*Input & output fully TTL interfaced & buffered (10 T2L fan-out capability)
*Resolution: 0.5ns typical
*Adjustment range: 7ns to 25ns
*Output rise time: 4ns typical
*Min. input pulse width: 10ns
*Power dissipation: 230mW maximum
*Operating temperature: 0° to 70°C (Commercial) -55° to 125°C (Military)

APPLICATION NOTES
*HIGH FREQUENCY RESPONSE
The DDU39F tolerances are guaranteed for input pulse widths and periods greater than those
specified in the test conditions.
Although the device will function properly for pulse widths as small as 10ns and periods as small 20ns (for a symmetric input), the delays may deviate from their values at low frequency.
However, for a given input condition, the deviation will be repeatable from pulse to pulse.
Contact technical support at Data Delay Devices if your application requires device testing at a specific input condition.
*POWER SUPPLY BYPASSING
The DDU39F relies on a stable power supply to produce repeatable delays within the stated
tolerances.
A 0.1uf capacitor from VCC to GND, located as close as possible to the VCC pin, is recommended.
A wide VCC trace and a clean ground plane should be used.

DDU39F
DDU39FM
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