Rev.: E

Amendment: /0

Issue Date: May, 1998

125MHz TRIGGER

PROGRAMMABLE TIMING

EDGE VERNIER

SY604

DESCRIPTION

FEATURES

Micrel-Synergy's SY604 is an ECL-compatible timing vernier

(delay generator) whose time delay is programmed via an 8-

bit code which is loaded concurrently with the circuit trigger.

The SY604 is fabricated in Micrel-Synergy's proprietary

ASSET™ bipolar process.

This device can be retriggered at speeds up to 125MHz,

with a delay span as short as 4ns. At minimum span, the

resolution is 4ns/255 = 15.7ps per step. The delay span is

externally adjustable up to 40ns. The SY604 employs

differential TRIGGER inputs, and produces a differential

OUTPUT pulse; all other control signals are single-ended

ECL. Edge delay is specified by an 8-bit input which is loaded

into the device with the TRIGGER. The output pulse width will

typically be 3.5ns.

The SY604 is commonly used in Automatic Test Equipment

to provide precise timing edge placement; it is also found in

many instrumentation and communications applications.

Micrel-Synergy's circuit design techniques coupled with

ASSET™ technology result in not only ultra-fast performance,

but allow device operation at lower power dissipation than

competing technologies. Outstanding reliability is achieved in

volume production.

s True 125MHz retrigger rate

s Pin-compatible with Bt604

s 15ps delay resolution

s Less than

s Differential TRIGGER inputs

s Delay spans from 4 to 40ns

s Compatible with 10KH ECL logic

s Lower power dissipation 350mW typical

s Available in 28-pin plastic (PLCC) or metal (MLCC)

J-lead package

BLOCK DIAGRAM

PIN CONFIGURATION

LATCH

I/V

8

8

+

–

LINEAR

RAMP

GENERATOR

D

R

FF

0 = STOP

1 = RUN

OUT

IEXT

D0 - D7

CE

TRIG

PULSE

GEN

DAC

CE

NC

NC

IEXT

18

17

16

15

14

13

12

56

7

8

9

10 11

26

27

28

1

2

3

4

TOP VIEW

PLCC

J28-1

25 24 23

21 20 19

22

1