DESCRIPTION
The DS1021 Programmable 8-Bit Silicon Delay Line consists of an 8-bit, user-programmable CMOS silicon integrated circuit. Delay values, programmed using either the 3-wire serial port or the 8-bit parallel port, can be varied over 256 equal steps. The faster model (-25) offers a maximum delay of 73.75 ns with an incremental delay of 0.25 ns, while the slower model (-50) has a maximum delay of 137.5 ns with an incremental delay of 0.5 ns. 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.

FEATURES
◾ All-silicon time delay
◾ Models with 0.25 ns and 0.5 ns steps
◾ Programmable using 3-wire serial port or 8-bit parallel port
◾ Leading and trailing edge accuracy
◾ Economical
◾ Auto-insertable, low profile, 16-pin SOIC package
◾ Low-power CMOS
◾ TTL/CMOS-compatible
◾ Vapor phase, IR and wave solderable