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111799

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

PIN ASSIGNMENT

PIN DESCRIPTION

IN

- Delay Input

P0-P7

- Parallel Program Pins

GND

- Ground

OUT

- Delay Output

- +5 Volts

S

- Mode Select

E- Enable

C

- Serial Port Clock

Q

- Serial Data Output

D

- 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 circuit has been designed as a reliable, economic alternative to hybrid

programmable delay lines. It is offered in a space-saving surface mount 16-pin SOIC.

DS1021

Programmable 8-Bit

Silicon Delay Line

www.dalsemi.com

DS1021S 16-Pin SOIC (300-mil)

See Mech. Drawings Section

IN

E

Q/PO

P1

P3

P2

GND

OUT

P6

P5

D

C

P7

1

2

3

4

5

6

7

16

15

14

13

12

8

9

10

11

P4

S