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PRODUCT
PREVIEW
THCTPAL16L8, THCTPAL16R4, THCTPAL16R6, THCTPAL16R8
HIGH·SPEED CMOS PAL CIRCUITS
• Standard 20-Pin PAL Family
• Low Standby Power CMOS Logic
• User-Programmable Custom Designs
Combine Many SSI and MSI Functions on
One Chip
• TTL- and HC-Compatible Inputs and Outputs
• Security Cell for Proprietary Design
Protection
o
Preload Feature to Aid Testing
• Choice of DIP or SO (Small Outline)
Package
• Fully Tested for High Programming Yield
Before Packaging
• Dependable Texas Instruments Quality and
Reliability
description
The THCTPAL 16L8, THCTPAL 16R4,
THCTPAL 16R6, and THCTPAL 16R8 are
compatible with TTL and HCT logic. They are
also compatible with HC logic over the VCC
range of 4.5 to 5.5 volts and have electrical
characteristics that are similar to the SN74HC
family. The devices have negligible static power
dissipation.
These PAL devices implement the sum-ofproduct
(AND-OR) structure. The user can select
the product terms and customize the device
function to fit a wide variety of applications. The
user can select any combination of the true or
complement terms from the eight inputs and a
variety of feedback terms of the device.
The programming cell consists of a FAMOS
(floating-gate) device like those used in EPROMs.
All 32 terms of each AND gate are initially
connected. The unwanted terms are
programmed out by applying a high voltage to
the programming cell of the selected term. When
both the true and complement cells of a term are
left unprogrammed, the output of the AND gate
is a low logic level. When only the true term is
programmed, its complement becomes an input
to the AND gate. When the complement term is
programmed, its true term becomes an input to
the AND gate. When both the true and
complement of a term are programmed, the term
level is irrelevant. Up to eight products are
summed by an OR gate.
THCTPAL 16LS-M ... J PACKAGE
THCTPAL 16LS-C ... J OR N PACKAGE
(TOP VIEW)
GND~ __ r-
Vee
o
I/O
I/O
I/O
I/O
I/O
I/O
THCTPAL 16R4-M ... J PACKAGE
THCTPAL 16R4-C ... J OR N PACKAGE
(TOP VIEW)
o
eLK
Vee
I/O
I/O
Q
Q
Q
Q
I/O
I/O
GND-...._----"r-
THCTPAL 16R6-M ... J PACKAGE
THCTPAL 16R6-C ... J OR N PACKAGE
(TOP VIEW)
eLK
Vee
I/O
Q
Q
Q
Q
Q
Q
I/O
GND~ __ r-OE
THCTPAL 16RS-M ... J PACKAGE
THCTPAL 16RS-C ... J OR N PACKAGE
(TOP VIEW)
Q
Q
Q
I 6 15 Q
14 Q
13 Q
I 9 12 Q
GND 10 11 DE
02927, OCTOBER 19B5
PRODUCT PREVIEW documents contain information
Copyright © 1985, Texas Instruments Incorporated
on products in the formative or design ~hase of
development. Characteristic data and other
specifications are design goals. Texas Instruments
TEXAS "'J}
3-59
reserves the right to change or discontinue these INSTRUMENTS
products without notice.
POST OFFICE BOX 225012 • DALLAS, TEXAS 75265
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