FEATURES
• All-silicon, low-power CMOS technology
• TTL/CMOS compatible inputs and outputs
• Vapor phase, IR and wave solderable
• Auto-insertable (DIP pkg.)
• Low ground bounce noise
• Leading- and trailing-edge accuracy
• Delay range: 0.75ns through 7000ns
• Delay tolerance: 2% or 0.5ns
• Temperature stability: ±2% typical (-40C to 85C)
• Vdd stability: ±1% typical (3.0V-3.6V)
• Minimum input pulse width: 15% of total delay
• 14-pin Gull-Wing available as drop-in replacement for hybrid delay lines

FUNCTIONAL DESCRIPTION
 The 3D3220 10-Tap Delay Line product family consists of fixed-delay CMOS integrated circuits. Each package contains a single delay line, tapped and buffered at 10 points spaced uniformly in time. Tap-to-tap (incremental) delay values can range from 0.75ns through 700ns. The input is reproduced at the outputs without inversion, shifted in time as per the user-specified dash number.
 
 The 3D3220 is TTL- and CMOS-compatible, capable of driving ten 74LS-type loads, and features both rising- and falling-edge accuracy. The all-CMOS 3D3220 integrated circuit has been designed as a reliable, economic alternative to hybrid TTL fixed delay lines. It is offered in a standard 14-pin auto-insertable DIP and space saving surface mount 14-pin SOIC and 16-pin SOL packages.

APPLICATION NOTES
OPERATIONAL DESCRIPTION The 3D3220 ten-tap delay line architecture is shown in Figure 1. The delay line is composed of a number of delay cells connected in series. Each delay cell produces at its output a replica of the signal present at its input, shifted in time. The delay cells are matched and share the same compensation signals, which minimizes tap-to-tap delay deviations over temperature and supply voltage variations.

INPUT SIGNAL CHARACTERISTICS
The Frequency and/or Pulse Width (high or low) of operation may adversely impact the specified delay accuracy of the particular device. The reasons for the dependency of the output delay accuracy on the input signal characteristics are varied and complex. Therefore a Maximum and an Absolute Maximum operating input frequency and a Minimum and an Absolute Minimum operating pulse width have been specified.

OPERATING FREQUENCY
The Absolute Maximum Operating Frequency specification, tabulated in Table 1, determines the highest frequency of the delay line input signal that can be reproduced, shifted in time at the device output, with acceptable duty cycle distortion. The Maximum Operating Frequency specification determines the highest frequency of the delay line input signal for which the output delay accuracy is guaranteed.

 To guarantee the Table 1 delay accuracy for input frequencies higher than the Maximum Operating Frequency, the 3D3220 must be tested at the user operating frequency. Therefore, to facilitate production and device identification, the part number will include a custom reference designator identifying the intended frequency of operation. The programmed delay accuracy of the device is guaranteed, therefore, only at the user specified input frequency. Small input frequency variation about the selected frequency will only marginally impact the programmed delay accuracy, if at all. Nevertheless, it is strongly recommended that the engineering staff at DATA DELAY DEVICES be consulted.

OPERATING PULSE WIDTH
 The Absolute Minimum Operating Pulse Width (high or low) specification, tabulated in Table 1, determines the smallest Pulse Width of the delay line input signal that can be reproduced, shifted in time at the device output, with acceptable pulse width distortion. The Minimum Operating Pulse Width (high or low) specification determines the smallest Pulse Width of the delay line input signal for which the output delay accuracy tabulated in Table 1 is guaranteed.

 To guarantee the Table 1 delay accuracy for input pulse width smaller than the Minimum Operating Pulse Width, the 3D3220 must be tested at the user operating pulse width. Therefore, to facilitate production and device identification, the part number will include a custom reference designator identifying the intended frequency and duty cycle of operation. The programmed delay accuracy of the device is guaranteed, therefore, only for the user specified input characteristics. Small input pulse width variation about the selected pulse width will only marginally impact the programmed delay accuracy, if at all. Nevertheless, it is strongly recommended that the engineering staff at DATA DELAY DEVICES be consulted.

3D3220-xx
3D3220G-XX
3D3220D-xx
3D3220S-xx

Trackback :: http://datasheetblog.com/trackback/706

댓글을 달아 주세요 Comment