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Array Logic. PALLV16V8Z-20PI Datasheet |
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FINAL
COM’L:-10
IND:-20
PALLV16V8-10 and PALLV16V8Z-20
Low Voltage, Zero Power 20-Pin EE CMOS
Universal Programmable Array Logic
DISTINCTIVE CHARACTERISTICS
x Low-voltage operation, 3.3 V JEDEC compatible
— VCC = +3.0 V to +3.6 V
x Pin and function compatible with all 20-pin PAL® devices
x Electrically-erasable CMOS technology provides reconfigurable logic and full testability
x Direct plug-in replacement for the PAL16R8 series
x Designed to interface with both 3.3-V and 5-V logic
x Outputs programmable as registered or combinatorial in any combination
x Programmable output polarity
x Programmable enable/disable control
x Preloadable output registers for testability
x Automatic register reset on power up
x Cost-effective 20-pin plastic DIP, PLCC, and SOIC packages
x Extensive third-party software and programmer support
x Fully tested for 100% programming and functional yields and high reliability
GENERAL DESCRIPTION
The PALLV16V8 is an advanced PAL device built with low-voltage, high-speed, electrically-erasable
CMOS technology. It is functionally compatible with all 20-pin GAL devices. The macrocells
provide a universal device architecture. The PALLV16V8 will directly replace the PAL16R8, with the
exception of the PAL16C1.
The PALLV16V8Z provides zero standby power and high speed. At 30-µA maximum standby
current, the PALLV16V8Z allows battery powered operation for an extended period.
The PALLV16V8 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 equations are programmed into the device through floating-gate cells
in the AND logic array that can be erased electrically.
The fixed OR array allows up to eight data product terms per output for logic functions. The sum
of these products feeds the output macrocell. Each macrocell can be programmed as registered or
combinatorial with an active-high or active-low output. The output configuration is determined by
two global bits and one local bit controlling four multiplexers in each macrocell.
Publication# 17713 Rev: E
Amendment/0
Issue Date: November 1998
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BLOCK DIAGRAM
I1 - I8
8
Programmable AND Array
32 x 64
CLK/I0
MACRO
MC0
MACRO
MC1
MACRO
MC2
MACRO
MC3
MACRO
MC4
MACRO
MC5
MACRO
MC6
MACRO
MC7
OE/I9
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7 17713D-1
FUNCTIONAL DESCRIPTION
The PALLV16V8 is a low-voltage, EE CMOS version of the PALCE16V8.
The PALLV16V8Z is a low-voltage, EE CMOS version of the PALCE16V8. In addition, the
PALLV16V8Z has zero standby power and an unused product term disable feature for reduced
power consumption.
The PALLV16V8 is a universal PAL device. It has eight independently configurable macrocells
(MC0-MC7). Each macrocell can be configured as registered output, combinatorial output,
combinatorial I/O or dedicated input. The programming matrix implements a programmable AND
logic array, which drives a fixed OR logic array. Buffers for device inputs have complementary
outputs to provide user-programmable input signal polarity. Pins 1 and 11 serve either as array
inputs or as clock (CLK) and output enable (OE), respectively, for all flip-flops.
Unused input pins should be tied directly to VCC or GND. Product terms with all bits
unprogrammed (disconnected) assume the logical HIGH state and product terms with both true
and complement of any input signal connected assume a logical LOW state.
The programmable functions on the PALLV16V8 are automatically configured from the user’s
design specification. The design specification is processed by development software to verify the
design and create a programming file. This file, once downloaded to a programmer, configures the
device according to the user’s desired function.
2 PALLV16V8-10 and PALLV16V8Z-20 Families
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