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HC257

STMicroelectronics
Part Number HC257
Manufacturer STMicroelectronics
Description QUAD 2 CHANNEL MULTIPLEXER 3-STATE
Published Mar 23, 2005
Detailed Description ® 74VHC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s s s s s HIGH SPEED: tPD = 3.7 ns (TYP.) at VCC = 5V...
Datasheet PDF File HC257 PDF File

HC257
HC257

Overview
® 74VHC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s s s s s HIGH SPEED: tPD = 3.
7 ns (TYP.
) at VCC = 5V LOWPOWER DISSIPATION: ICC = 4 µA (MAX.
) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.
) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 5.
5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY LOWNOISE VOLP = 0.
8V (Max.
) M (Micro Package) T (TSSOP Package) ORDER CODES : 74VHC257M 74VHC257T The 74VHC257 is a non inverting multiplexer.
When the ENABLE INPUT is held ”High”, all outputs become high impedance state.
If SELECT INPUT is held ”Low”, ”A” data is selected, when SELECT INPUT is ”High”, ”B” data is chosen.
Power down protection is provided on all inputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage.
This device can be used to interface 5V to 3V.
All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
DESCRIPTION The 74VHC257 is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.
It is composed of four independent 2 channel multiplexers with common SELECT and ENABLE INPUT.
PIN CONNECTION AND IEC LOGIC SYMBOLS June 1999 1/9 74VHC257 INPUT 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 FUNCT ION Common 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 OUTPUTS A X L H X X B X X X L H Y Z L H L H SELE CT X L L H H LOGIC DIAGRAM Thislogic diagram has notbe used to estimat...


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