E649 datasheet(8/14 Pages) SEMTECH

8 / 14 page

 2000 Semtech Corp.

www.semtech.com

EDGE HIGH-PERFORMANCE PRODUCTS

Edge649

Application Information (continued)

Also, either the pull up or pull down resistor could be

used to terminate the transmission from the DUT to the

pin electronics in an effort to minimize any reflections.

Figure 9. Driver with Pull Up/Pull Down

Trinary Driver with Termination

Other combinations are also possible. For example, two

parallel drivers can be configured to implement one

trinary driver with a pull down (or pull up) dynamic

termination (see Figure 10).

Figure 10. Trinary Driver with Termination

Two Logic Family Driver

Many test systems support exactly two families of driver

and receiver levels and select between family A and family

B settings on a per-pin basis, typically using an analog

multiplexer, (See Figure 11.) Common examples of these

families are:

Family A = TTL

Family B = CMOS

Family A = TTL

Family B = ECL

The Edge649 supports this system architecture with

minimal hardware and the elimination of the per-pin

analog multiplexer. The drive and receive levels need to

be generated once per system, then distributed and

buffered suitably.

Parametric Functions

Two drivers in parallel also offer the possibility of

connecting force and sense parametric circuitry to the

DUT without adding additional circuitry to the controlled

impedance DUT line. For example, Figure 12 shows the

second driver being utilized to force a current and

measure a voltage.

Notice that the VHIGH and VLOW pins are used from

different drivers to allow the force and sense functions

to be active simultaneously.

DUT

DATA IN A

DVR EN*A

DATA IN B

DVR EN*B

VHIGH A

VHIGH B

VLOW B

VLOW A

VPULL UP

VPULL DOWN

DUT

DATA IN A

DVR EN*A

DATA IN B

DVR EN*B

VHIGH A

VHIGH B

VLOW A

VTERMINATION

Figure 11. Family A/B Using Two Drivers Per Pin

DUT0

DVR DATA

DVR EN*A

DVR EN*B

VHIGH A

VLOW B

VHIGH B

VLOW A

CHANNEL 1

DUT0

DVR DATA

DVR EN*A

DVR EN*B

CHANNEL n

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