74AC257 Datasheet | STMicroelectronics

DESCRIPTION selected, when SELECT INPUT is ”High”, ”B” The AC257 is an advanced high-speed CMOS .. 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: t PD =4.5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 o C HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 m A (MIN) BALANCED PROPAGATION DELAYS: t PLH ≅ t PHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION PATIBLE 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 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 5, 14, 11 3, 6, 13, 10 4, 7, 12, 9 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y OE GND VCC NAME AND F UNCTIO N mon Data Select Input Data Input From Source A Data Inputs from Source B 3 State Multiplexer Outputs 3 State Output Enable Inputs (Active LOW) Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT S OE H L L L L X = DON’T CARE Z = HIGH IMPEDANCE OUT PUT S A X L H X X B X X X L H Y Z L H L H SELECT X L L H H LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays 2/10 ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 ± 20 ± 20 ± 50 ± 200 -65 to +150 300 Unit V V V m A m A m A m A o o ICC or IGND DC VCC or...