User`s guide

MaxLoader User’s Guide
126
test the functionality of your design and validate test vectors that you design
before programming a device.
PQFP Plastic Quad Flat Pack. See QFP.
QFP Quad Flat Pack. A square IC package that has surface-mount leads coming
from four sides. It is used for high-density applications, usually over 100
pins. Lead pitch may be 0.025 inches or smaller.
RAM Random Access Memory. A volatile memory device.
ROM Read Only Memory. A non-volatile memory device that cannot be
programmed by the user. It is programmed at the factory through the use of a
mask pattern in the final fabrication steps of the die.
Serial Memory An EPROM or EEPROM that is accessed by shifting in addresses and
shifting out data one bit at a time. Interfaces are available using one, two or
three wires for clock, data in, and data out.
Socket module An interchangeable metal chassis that contains a programming socket.
SOIC Small Outline Integrated Circuit. A surface-mount IC package that has two
rows of leads on opposite sides. Commonly found in 8 to 32 pin sizes. Leads
are usually 0.050 pitches.
Test vector A set of characters that describe the inputs and outputs of a device during a
functional test. There is one character in the vector for each pin on the device.
Numbers represent inputs to be applied to the device (1 for Vih, 0 for Vil).
Letters represent the outputs that must be tested (H for Voh, L for Vol, Z for
high-impedance). During the test, the part will be powered up and each input
will be applied to the device for the first vector. Then, each output will be
applied to the device for the first vector. This process will continue for each
vector and any errors will be reported.
TQF Thin Quad Flat Pack. Similar to QFP but with a lower profile and physically
smaller in length and width.
TSOP Thin Small Outline Package. A surface-mount package with fine-pitch leads
(usually 0.025 inch pitch) on two sides. This package is very low profile and
commonly available in a reverse (mirror image) pin out used to simplify
circuit board layout; usually 32 to 44 pins.