74F257A Datasheet | Fairchild Semiconductor

Description The 74F257A is a quad 2-input multiplexer with 3-STATE outputs. Four bits of data from two sources can be selected using a mon Data Select input. The four outputs present the selected data in true (non-inverted) form. The outputs may be switched to a high impedance state with a HIGH on the mon Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. Features s Multiplexer expansion by tying outputs together s Non-inverting 3-STATE outputs s Input clamp diodes limit high-speed termination effects Ordering Code: Order Number 74F257ASC 74F257ASJ 74F257APC Package Number M16A M16D N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC © 1999 Fairchild Semiconductor Corporation DS009507 .fairchildsemi. Unit Loading/Fan Out Pin Names S OE I0a- I0d I1a- I1d Za- Zd Description mon Data Select Input 3-STATE Output Enable Input (Active LOW) Data Inputs from Source 0 Data Inputs from Source 1 3-STATE Multiplexer Outputs U.L. HIGH/LOW 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 150/40 (33.3) Input IIH/IIL Output IOH/IOL 20 µA/- 0.6 m A 20 µA/- 0.6 m A 20 µA/- 0.6 m A 20 µA/- 0.6 m A - 3 m A/24 m A (20 m A) Truth Table Output Enable OE H L L L L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Functional Description Data Output Inputs I0 X X X L H I1 X L H X X Z Z L H L H The 74F257A is a quad 2-input multiplexer with 3-STATE outputs. It selects four bits of data from two sources under control of a mon Data Select input. 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...