DS1021 Dallas Semiconducotr, DS1021 Datasheet
DS1021
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DS1021 Summary of contents
Page 1
... Both models have an inherent (step zero) delay of 10 ns. After the user-determined delay, the input logic state is reproduced at the output without inversion. The DS1021 is TTL- and CMOS-compatible, capable of driving 10 74LS-type loads, and features both rising and falling edge accuracy ...
Page 2
... If the value read is restored before enable (E) is returned to logic 0, no settling time (t unchanged. Since the DS1021 is a CMOS design, unused input pins (P1 - P7) must be connected to well-defined logic levels; they must not be allowed to float. Serial output Q/P0 should be allowed to float if unused. and ground. For applications requiring frequent ...
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... FUNCTION BLOCK DIAGRAM Figure 1 SERIAL READOUT Figure 2 DS1021 ...
Page 4
... DS1021 DELAY CHANGE MAX DEVIATION FROM PER STEP (NOM) PROGRAMMED DELAY 0.25 0.5 ∬ ...
Page 5
... The input waveform is produced by a precision pulse generator under software control. Time delays are measured by a time interval counter (20 ps resolution) connected to the output. The DS1021 serial and parallel ports are controlled by interfaces to a central computer. All measurements are fully automated with each instrument controlled by the computer over an IEEE 488 bus ...
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ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature Short Circuit Output Current * This is a stress rating only and functional operation of the device at these or any other conditions above ...
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PARAMETER SYMBOL Parallel Input Change to Delay Invalid Enable to Delay Valid Enable to Delay Invalid V Valid to Device CC Functional V Rise Time CC Input Pulse Width Input to Output Delay Input Period CAPACITANCE PARAMETER SYMBOL Input ...
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TERMINOLOGY Period: The time elapsed between the leading edge of the first pulse and the leading edge of the following pulse. (Pulse Width): The elapsed time on the pulse between the 1.5V point on the leading edge and the t ...
Page 9
... All voltages are referenced to ground and 25°C. Delay accurate on both rising and falling edges within tolerances given in CC Table 1. 3. Measured with output open. 4. The “Q” output will only source 4 mA. This pin is only intended to drive other DS1021s ...