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74HCT253 데이터시트(PDF) 2 Page - NXP Semiconductors |
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2 / 7 page December 1990 2 Philips Semiconductors Product specification Dual 4-input multiplexer; 3-state 74HC/HCT253 FEATURES • Non-inverting data path • 3-state outputs for bus interface • and multiplex expansion • Common select inputs • Separate output enable inputs • Output capability: bus driver • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT253 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT253 have two identical 4-input multiplexers with 3-state outputs which select two bits from four sources selected by common data select inputs (S0,S1). When the individual output enable (1OE, 2OE) inputs of the 4-input multiplexers are HIGH, the outputs are forced to the high impedance OFF-state. The “253” is the logic implementation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels applied to S0 and S1. The logic equations for the outputs are: 1Y=1OE(1l0.S1.S0+1I1.S1.S0+1I2.S1.S0+1I3.S1.S0) 2Y=2OE(2l0.S1.S0+2I1.S1.S0+2I2.S1.S0+2I3.S1.S0) APPLICATIONS • Data selectors • Data multiplexers QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD = CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC − 1.5 V ORDERING INFORMATION See “74HC/HCT/HCU/HCMOS Logic Package Information”. SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL/ tPLH propagation delay CL = 15 pF; VCC = 5 V 1In, 2In to nY; 17 17 ns Sn to nY 18 19 ns CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per multiplexer notes 1 and 2 55 55 pF |
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