USE GAL DEVICES FOR NEW DESIGNS
FINAL
COM’L: H-7/10/15/20
IND: H-10/15/20
Lattice Semiconductor
PALCE26V12 Family
28-Pin EE CMOS Versatile PAL Device
DISTINCTIVE CHARACTERISTICS
s 28-pin versatile PAL programmable logic
device architecture
s Electrically erasable CMOS technology
provides half power (only 115 mA) at high
speed (7.5 ns propagation delay)
s Two clock inputs for independent functions
s Global asynchronous reset and synchronous
preset for initialization
s Register preload for testability and built-in
register reset on power-up
s 14 dedicated inputs and 12 input/output
macrocells for architectural flexibility
s Space-efficient 28-pin SKINNYDIP and PLCC
packages
s Macrocells can be registered or combinatorial,
and active high or active low
s Center VCC and GND pins to improve signal
characteristics
s Varied product term distribution allows up to
16 product terms per output
s Extensive third-party software and programmer
support through FusionPLD partners
GENERAL DESCRIPTION
The PALCE26V12 is a 28-pin version of the popular
PAL22V10 architecture. Built with low-power, highspeed, electrically-erasable CMOS technology, the
PALCE26V12 offers many unique advantages.
Device logic is automatically configured according to
the user’s design specification. Design is simplified by
design software, allowing automatic creation of a
programming file based on Boolean or state equations.
The software can also be used to verify the design and
can provide test vectors for the programmed device.
The product terms are connected to the fixed OR array
with a varied distribution from 8 to 16 across the outputs
(see Block Diagram). The OR sum of the products feeds
the output macrocell. Each macrocell can be programmed as registered or combinatorial, active high or
active low, with registered I/O possible. The flip-flop can
be clocked by one of two clock inputs. The output
configuration is determined by four bits controlling three
multiplexers in each macrocell.
The PALCE26V12 utilizes the familiar sum-of-products
(AND/OR) architecture that allows users to implement
complex logic functions easily and efficiently. Multiple
levels of combinatorial logic can always be reduced
to sum-of-products form, taking advantage of the
very wide input gates available in PAL devices. The
functions are programmed into the device through
electrically-erasable floating-gate cells in the AND logic
array and the macrocells. In the unprogrammed state,
all AND product terms float HIGH. If both true and
complement of any input are connected, the term will be
permanently LOW.
2-306
Publication# 16072 Rev. E
Issue Date: February 1996
Amendment /0
