SN54AS866, SN74AS866A

8BIT MAGNITUDE COMPARATORS

SDAS183A − DECEMBER 1982 − REVISED JUNE 1990

POST OFFICE BOX 655303

POST OFFICE BOX 1443

6

TYPICAL APPLICATION DATA

This sequence of comparisons illustrates how the CLRQ function can be used to perform dual comparisons of the

varying P terms (P0, P1, etc.). When CLRQ is high, the P term is compared to the Q term. When CLRQ is taken low,

the P term is compared to zero. This or similar sequences can enhance performance and reduce package count to

perform value range checks.

P1:Zero

P1:Q0

P0:Zero

P2:Q0

P0:Q0

CLRQ

QLE

7

Q

Q

0

1=0

2D

C2

R

C3

QLE

CLRQ

QLE

P>Q

P

P

P=Q

P< Q

P>Q

3D

3D

3D

P=Q

P< Q

P>Q

7

’AS866(A)

COMP

M [ARITH, 2s COMP]

M [LOGIC]

L/A

PLE = H

0

1=0

1D

C1

P< Q

Figure 1. Magnitude Comparisons Combined With Quick Comparisons to Zero

(Range Verifications)