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IC > ·ÎÁ÷ IC > CMOS4000(SMD) > HEF4585BT (SO16)
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HEF4585BT (SO16)
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4-bit magnitude comparator

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 (A0 to A3 and B0 to B3); A3 and B3 being the
most significant inputs. Three outputs are provided;
A greater than B (OA > B), A less than B (OA < B) and
A equal to B (OA = B). Three expander inputs (IA > B,
IA < B and IA = B) allow cascading of the devices without
external gates.
For proper compare operation the expander inputs to the
least significant position must be connected as follows:
IA = B = IA > B = HIGH, IA < B = LOW. For words greater than
4-bits, units can be cascaded by connecting outputs
OA < B and OA = B to the corresponding inputs of the next
significant comparator (input IA > B is connected to a
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.


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