hef4585b NXP Semiconductors, hef4585b Datasheet - Page 2

• Manufacturer Part Number: hef4585b
• Description: 4-bit Magnitude Comparator
• Manufacturer: NXP Semiconductors

Philips Semiconductors
DESCRIPTION
The HEF4585B is a 4-bit magnitude comparator which
compares two 4-bit words (A and B), whether they are ‘less
than’, ‘equal to’, or ‘greater than’. Each word has four
parallel inputs (A
most significant inputs. Three outputs are provided;
A greater than B (O
A equal to B (O
I
external gates.
January 1995
A < B
4-bit magnitude comparator
and I
A = B
) allow cascading of the devices without
A = B
Fig.1 Functional diagram.
0
to A
A > B
). Three expander inputs (I
3
and B
), A less than B (O
0
to B
3
); A
3
and B
A < B
A > B
3
) and
being the
,
2
For proper compare operation the expander inputs to the
least significant position must be connected as follows:
I
4-bits, units can be cascaded by connecting outputs
O
significant comparator (input I
HIGH).
Operation is not restricted to binary codes, the devices will
work with any monotonic code. The function table
describes the operation of the device under all possible
logic conditions.
PINNING
FAMILY DATA, I
See Family Specifications
A = B
HEF4585BP(N):
HEF4585BD(F):
HEF4585BT(D):
( ): Package Designator North America
A
B
I
O
O
O
A > B
A < B
0
0
A > B
A < B
A = B
to A
to B
= I
, I
and O
A
A > B
3
3
B
, I
= HIGH, I
A = B
A = B
DD
Fig.2 Pinning diagram.
to the corresponding inputs of the next
LIMITS category MSI
word A parallel inputs
word B parallel inputs
expander inputs
A greater than B output
A less than B output
A equal to B output
16-lead DIL; plastic (SOT38-1)
16-lead DIL; ceramic (cerdip) (SOT74)
16-lead SO; plastic (SOT109-1)
A < B
= LOW. For words greater than
A > B
is connected to a
Product specification
HEF4585B
MSI