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MC74F258AD Datenblatt(PDF) 3 Page - Motorola, Inc |
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MC74F258AD Datenblatt(HTML) 3 Page - Motorola, Inc |
3 / 3 page 4-132 FAST AND LS TTL DATA MC74F258A AC CHARACTERISTICS 74F 74F TA = +25°C TA = 0°C to 70°C VCC = +5.0 V VCC = 5.0 V ± 10% CL = 50 pF CL = 50 pF Symbol Parameter Min Max Min Max Unit tPLH Propagation Delay 2.5 5.3 2.0 6.0 ns tPHL In to Zn 1.0 4.0 1.0 5.0 tPLH Propagation Delay 3.0 7.5 3.0 8.5 ns tPHL S to Zn 2.5 7.0 2.5 8.0 tPZH Output Enable Time 2.0 6.0 2.0 7.0 ns tPZL 2.5 7.0 2.5 8.0 tPHZ Output Disable Time 2.0 6.0 2.0 7.0 ns tPLZ 1.5 6.0 1.5 7.0 FUNCTIONAL DESCRIPTION The F258A is a quad 2-input multiplexer with 3-state out- puts. It selects four bits of data from two sources under control of a common Select input (S). When the Select input is LOW, the I0x inputs are selected and when Select is HIGH, the I1x inputs are selected. The data on the selected inputs appears at the outputs in inverted form. The F258A is the logic imple- mentation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Se- lect input. The logic equations for the outputs are shown be- low: Za = OE • (I1a • S + I0a • S) Zb = OE • (I1b • S + I0b • S) Zc = OE • (I1c • S + I0c • S) Zd = OE • (I1d • S + I0d • S) When the Output Enable input (OE) is HIGH, the outputs are forced to a high impedance OFF state. If the outputs of the 3-state devices are tied together, all but one device must be in the high impedance state to avoid high currents that would ex- ceed the maximum ratings. Designers should ensure the Out- put Enable signals to 3-state devices whose outputs are tied together are designed so there is no overlap. |
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