User`s manual

Chapter 3 Interface Information

www.exatron.com 3/19/01

3-11

IGURE

3-2

ANDLER

ORT

NTERFACE

Timing Detail

The handler first moves a device into the test site. After allowing time for the device to settle, (

NOTE

this settling time is programmable; use address 0097) the test head plunger picks up the device and

plunges it down toward the contactors. Then the handler issues a start pulse (Pin 10) to the tester. The

start pulse width is programmable, (address 0098) but will be pre-set to 20 milliseconds. This pulse is

normally High (+5) and goes Low for the pulse width. There is an additional signal available on Pin 22.

This testing signal will go Low for the duration of the test. It will go Low at the start of the start pulse and

will not go High again until the handler receives a sort signal.

To complete the test, the tester must send back one of eight sort signals. These signals must be normally

High and go Low for at least two milliseconds. The sorts must appear on Pin 1 through Pin 8 on the

handler port connector. We recommend that you use Pin 1 for PASS and Pin 2 for FAIL when using the

handler in PASS/FAIL applications.

The Input Sort is connected to a PAL device which "latches" the signal. The latch sets the falling edge of

the sort signal ON. Make certain that your interface does not allow fast "glitches" which may become

latched, causing the handler to mis-sort. If desired, the PAL may be modified to one that requires an

"End of Test" edge as well. Further details are provided in the Handler Port Options section later in this

chapter.

To abort the test, press the

[Clear]

button on the handler controller. This will sort the DUT to the Home

bin, output tube 5.

INDEX / SORT TIME

TEST TIME

20 MSEC

ADJUSTABLE

SORT MUST BE STABLE FOR 1 MSEC MINIMUM PRIOR TO EOT

PULSE OR LEVEL

HANDLER ALLOWS ONLY

ONE SORT INPUT PER TEST

ALL HANDLER INPUTS AND

OUTPUTS STANDARD

TTL LOGIC

NORMALLY HIGH

ACTIVE LOW