DDU37F-25 Datasheet

Mechanically Variable TTL Delay Line


Features, Applications


Ideal for "Set and Forget" applications Multi-turn adjustment screw (approx. 40 turns) Input & output fully TTL interfaced & buffered T L fan-out capability) Resolution: As low as 0.12ns Minimum delay (TD0): 6ns typical Output rise time: 2ns typical Min. input pulse width: 20% of maximum delay Power dissipation: 230mW maximum Operating temperature: to 70�C (Commercial) to 125�C (Military) Temperature coefficient: 100 PPM/�C

The DDU37F-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 TD0 and TD0+ TDVAR, where TDVAR is given by the device dash number (See Table). The device operates from a single 5V supply and is TTL interfaced, capable of driving to 10 TTL loads.

IN OUT VCC GND NC Signal Input Fixed Output +5V Ground No connection
Note: Other delay times available on request

The DDU37F 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 20% of the total delay and periods as small 40% of the total delay (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.

The DDU37F 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.

PARAMETER DC Supply Voltage Input Pin Voltage Storage Temperature Lead Temperature SYMBOL VCC VIN TSTRG TLEAD MIN -0.3 -55 MAX 150 300 UNITS NOTES

to 5.25V) PARAMETER High Level Output Voltage Low Level Output Voltage High Level Output Current Low Level Output Current High Level Input Voltage Low Level Input Voltage Input Clamp Voltage Input Current at Maximum Input Voltage High Level Input Current Low Level Input Current Short-circuit Output Current Output High Fan-out Output Low Fan-out SYMBOL VOH VOL IOH IOL VIH VIL VIK IIHH IIH IIL IOS MIN 2.5 TYP 3.4 0.35 MAX UNITS �A mA Unit Load NOTES VCC = MIN, IOH = MAX VIH = MIN, VIL = MAX VCC = MIN, IOL = MAX VIH = MIN, VIL = MAX

INPUT: o Ambient Temperature: 25 Supply Voltage (Vcc): � 0.1V Input Pulse: High � 0.1V Low � 0.1V Source Impedance: 50 Max. Rise/Fall Time: 3.0 ns Max. (measured between 0.6V and 2.4V ) Pulse Width: PWIN 1.5 x Total Delay Period: PERIN 10 x Total Delay OUTPUT: Load: Cload: Threshold: 1 FAST-TTL Gate 10% 1.5V (Rising & Falling)

NOTE: The above conditions are for test only and do not in any way restrict the operation of the device.



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