74AC257

74AC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s These IC’s are composed of an independent 2 channel multiplexer with common SELECT and ENABLE INPUT. s The AC257 is a non inverting multiplexer. When the ENABLE INPUT is held ”High”, outputs s of both IC’s become high impedance state. If SELECT INPUT is held ”Low”, ”A” data is DESCRIPTION selected, when SELECT INPUT is ”High”, ”B” The AC257 is an advanced high-speed CMOS www.DataSheet4U.com data is chosen. QUAD 2 CHANNEL MULTIPLEXER (3-STATE) All inputs and outputs are equipped with fabricated with sub-micron silicon gate and 2 protection circuits against static discharge, giving double-layer metal wiring C MOS technology. them 2KV ESD immunity and transient excess It is ideal for low power applications mantaining voltage. high speed operation similar to equivalent Bipolar Schottky TTL. s HIGH SPEED: tPD =4.5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY B M (Plastic Package) (Micro Package) ORDER CODES : 74AC257B PIN CONNECTION AND IEC LOGIC SYMBOLS April 1997 1/10 74AC257 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 5, 14, 11 3, 6, 13, 10 4, 7, 12, 9 15 8 ...