74F257A Datasheet | Fairchild Semiconductor

74F257A Quad 2-Input Multiplexer with 3-STATE Outputs April 1988 Revised August 1999 74F257A Quad 2-Input Multiplexer with 3-STATE Outputs General 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. 74F257A 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 mA 20 µA/- 0.6 mA 20 µA/- 0.6 mA 20 µA/- 0.6 mA - 3 mA/24 mA (20 mA) 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...