Philips Semiconductors Programmable Logic Devices
Product specification
PAL devices
20L8, 20R8, 20R6, 20R4
PLUS20R8D/-7 SERIES
FEATURES
•
Ultra high-speed
–
t
PD
= 7.5ns and f
MAX
= 74MHz for the
PLUS20R8-7 Series
–
t
PD
= 10ns and f
MAX
= 60 MHz for the
PLUS20R8D Series
DESCRIPTION
The Philips Semiconductors PLUS20XX
family consists of ultra high-speed 7.5ns and
10ns versions of Series 24 PAL devices.
The PLUS20XX family is 100% functional
and pin-compatible with the 20L8, 20R8,
20R6, and 20R4 Series devices.
The sum of products (AND-OR) architecture
is comprised of 64 AND gates and 8 fixed OR
gates. Multiple bidirectional pins provide
variable input/output pin ratios. Individual
3-State control of all outputs and registers
with feedback (R8, R6, R4) is also provided.
Proprietary designs can be protected by
programming the security fuse.
The PLUS20R8, R6, and R4 have D-type
flip-flops which are loaded on the
Low-to-High transition of the clock input.
In order to facilitate state machine design and
testing, a power-up reset function has been
incorporated into these devices to reset all
internal registers to active-Low after a
specific period of time.
The Philips Semiconductors State-of-the-Art
oxide isolation Bipolar fabrication process is
employed to achieve high-performance
operation.
The PLUS20XX family of devices are field
programmable, enabling the user to quickly
generate custom patterns using standard
programming equipment. See the
programmer chart for qualified programmers.
The SNAP software package from Philips
Semiconductors supports easy design entry
for the PLUS20XX series as well as other
PLD devices from Philips Semiconductors.
The PLUS20XX series are also supported by
other standard CAD tools for PAL-type
devices.
Order codes are listed in the Ordering
Information table.
•
100% functionally and pin-for-pin
compatible with industry standard 24-pin
PAL
®
ICs
•
Power-up reset function to enhance state
machine design and testability
•
Design support provided via SLICE and
other CAD tools for Series 24 PAL devices
•
Field-programmable on industry standard
programmers
•
Security fuse
•
Individual 3-State control of all outputs
DEVICE NUMBER
PLUS20L8
PLUS20R8
PLUS20R6
PLUS20R4
DEDICATED
INPUTS
14
12
12
12
COMBINATORIAL
OUTPUTS
8 (6 I/O)
0
2 I/O
4 I/O
REGISTERED
OUTPUTS
0
8
6
4
ORDERING INFORMATION
DESCRIPTION
ORDER CODE
PLUS20R8DN
PLUS20R6DN
PLUS20R4DN
PLUS20L8DN
PLUS20R8–7N
PLUS20R6–7N
PLUS20R4–7N
PLUS20L8–7N
PLUS20R8DA
PLUS20R6DA
PLUS20R4DA
PLUS20L8DA
PLUS20R8–7A
PLUS20R6–7A
PLUS20R4–7A
PLUS20L8–7A
DRAWING
NUMBER
24-Pin (300mils-wide) Plastic Dual-In-Line Package (DIP)
0410D
28-Pin (300mils-wide) Plastic Leaded Chip Carrier (PLCC)
0401F
®
PAL is a registered trademark of Advanced Micro Devices, Inc.
September 10, 1993
52
853–1359 10778
Real-time operating system RTOS
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