MC74F258A QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The MC74F258A is a quad 2-input multiplexer with 3-state outputs. Four bits of data from two sources can be selected using a common Data Select input. The four outputs present the selected data in the complement (inverted) form. The outputs may be switched to a high impedance state with a HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. • Multiplexer Expansion by Tying Outputs Together • Inverting 3-State Outputs • AC Enhanced Version of the F258 QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS FAST SCHOTTKY TTL CONNECTION DIAGRAM (TOP VIEW) VCC OE I0c I1c Zc I0d I1d Zd 16 15 14 13 12 11 10 9 J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 2 3 4 5 6 7 8 S I0a I1a Za I0b I1b Zb GND 1 LOGIC DIAGRAM OE I0a I1a I0b I1b I0C I1C I0D I1C S D SUFFIX SOIC CASE 751B-03 16 1 ORDERING INFORMATION MC54FXXXAJ Ceramic MC74FXXXAN Plastic MC74FXXXAD SOIC LOGIC SYMBOL 1 S Za Zb Zc 4 Za 7 Zb Zd 12 Zc I1b I0c I1c 9 Zd I0d I1d VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 4-130 OE I0a I1a I0b 15 2 3 5 6 14 13 11 10 MC74F258A FUNCTION TABLE Output Enable Select Input Data Inputs OE S I0 I1 Z H X X X Z L H X L H L H X H L L L L X H L L H X L Output H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care Z = High Impedance GUARANTEED OPERATING RANGES Symbol VCC Parameter Min Typ Max Unit Supply Voltage 74 4.5 5.0 5.5 V TA Operating Ambient Temperature Range 74 0 25 70 °C IOH Output Current — High 74 –3.0 mA IOL Output Current — Low 74 24 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IOZH IOZL IIH Min Typ Max 2.0 74 2.7 74 2.4 Unit Test Conditions V Guaranteed Input HIGH Voltage 0.8 V Guaranteed Input LOW Voltage –1.2 V IIN = –18 mA VCC = MIN V IOH = –3.0 mA VCC = 4.75 V 3.3 VCC = MIN 0.5 V IOL = 24 mA VCC = MIN Output OFF Current — HIGH 50 µA VOUT = 2.7 V VCC = MAX Output OFF Current — LOW –50 µA VOUT = 0.5 V VCC = MAX Input HIGH Current 20 µA VIN = 2.7 V VCC = MAX 100 µA VIN = 7.0 V –0.6 mA VIN = 0.5 V VCC = MAX –150 mA VOUT = 0 V VCC = MAX IIL Input LOW Current IOS Output Short Circuit Current (Note 2) ICCH 0.35 –60 6.2 9.5 S, I1x = 4.5 V OE, I0x = GND ICCL Power Supply Current 15.1 23 mA I1x = 4.5 V OE, I0x, S = GND ICCZ 11.3 17 S, I0x = GND OE, I1x = 4.5 V NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 4-131 VCC = MAX 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 Symbol Parameter CL = 50 pF Min Max Min Max Unit ns tPLH Propagation Delay 2.5 5.3 2.0 6.0 tPHL In to Zn 1.0 4.0 1.0 5.0 tPLH Propagation Delay 3.0 7.5 3.0 8.5 tPHL S to Zn 2.5 7.0 2.5 8.0 tPZH Output Enable Time 2.0 6.0 2.0 7.0 2.5 7.0 2.5 8.0 2.0 6.0 2.0 7.0 1.5 6.0 1.5 7.0 tPZL tPHZ Output Disable Time tPLZ ns ns ns FUNCTIONAL DESCRIPTION The F258A is a quad 2-input multiplexer with 3-state outputs. 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 implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: 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 exceed the maximum ratings. Designers should ensure the Output Enable signals to 3-state devices whose outputs are tied together are designed so there is no overlap. FAST AND LS TTL DATA 4-132