DS1021

DS1021 Programmable 8-Bit Silicon Delay Line www.dalsemi.com FEATURES All-silicon time delay Models with 0.25 ns and 0.5 ns steps Programmable using 3-wire serial port or 8bit 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 PIN ASSIGNMENT IN E Q/PO P1 P2 P3 P4 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC OUT S P7 P6 C P5 D DS1021S 16-Pin SOIC (300-mil) See Mech. Drawings Section PIN DESCRIPTION IN P0-P7 GND OUT VCC S E C Q D - Delay Input - Parallel Program Pins - Ground - Delay Output - +5 Volts - Mode Select - Enable - Serial Port Clock - Serial Data Output - Serial Data Input 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. The all-CMOS DS1021 integrated ...