Philips Semiconductors Programmable Logic Devices
Programmable logic arrays
(18 × 42 × 10)
OR ARRAY – (B)
P
S
P
S
Pn STATUS
ACTIVE1
CODE
A
NOTES:
1. This is the initial unprogrammed state of
all links.
2. Any gate Pn will be unconditionally inhibited
if both the True and Complement of an input
(either I or B) are left intact.
VIRGIN STATE
A factory shipped virgin device contains all
fusible links intact, such that:
1. All outputs are at “H” polarity.
2. All Pn terms are disabled.
3. All Pn terms are active on all outputs.
Pn STATUS
INACTIVE
CODE
•
SP00282
CAUTION: PLS153A TEST
COLUMNS
The PLS153A incorporates two columns not
shown in the logic block diagram. These
columns are used for in-house testing of the
device in the unprogrammed state. These
columns must be disabled prior to using the
PLS153A in your application. If you are using
a Philips Semiconductors-approved
programmer, the disabling is accomplished
during the device programming sequence. If
these columns are not disabled, abnormal
operation is possible.
Furthermore, because of these test columns,
the PLS153A cannot be programmed using
the programmer algorithm for the PLS153.
Product specification
PLS153/A
October 22, 1993
7