PDF 74VHCT257AM Data sheet ( Hoja de datos )

Número de pieza	74VHCT257AM
Descripción	QUAD 2 CHANNEL MULTIPLEXER 3-STATE
Fabricantes	STMicroelectronics
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No Preview Available ! ® 74VHCT257A QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s HIGH SPEED: tPD = 5.8 ns (TYP.) at VCC = 5V s LOWPOWER DISSIPATION: ICC = 4 µA (MAX.) at TA = 25 oC s COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN), VIL = 0.8V (MAX) s POWER DOWN PROTECTION ON INPUTS & OUTPUTS s SYMMETRICAL OUTPUT IMPEDANCE: \|IOH\| = IOL = 8 mA (MIN) s BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL s OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V s PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 s IMPROVED LATCH-UP IMMUNITY s LOWNOISE: VOLP = 0.8V (Max.) DESCRIPTION The 74VHCT257A 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. PRELIMINARY DATA SOP TSSOP PACKAGE SOP TSSOP ORDER CODES T UB E T&R 74VHCT257AM 74VHCT257AMTR 74VHCT257ATTR The 74VHCT257A 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 output 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. PIN CONNECTION AND IEC LOGIC SYMBOLS March 2000 1/9 1 page 74VHCT257A CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Conditions Value Un it TA = 25 oC -40 to 85 oC Min. Typ . Max. Min . Max. CIN Input Capacitance 4 10 10 pF COUT Output Capacitance 6 pF CPD Power Dissipation Capacitance (note 1) 23 pF 1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/4 (per Channel) DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter Test Conditions V CC ( V) Value TA = 25 oC Min. Typ. Max. -40 to 85 oC Min . Max. Un it VOLP Dynamic Low Voltage VOLV Quiet Output (note 1, 2) 5.0 0.3 0.8 -0.8 -0.3 VIHD Dynamic High Voltage Input (note 1, 3) 5.0 CL = 50 pF 2.0 V VILD Dynamic Low Voltage Input (note 1, 3) 5.0 0.8 1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n -1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to3.0V. Inputs under test switching: 3.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. TEST CIRCUIT TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 1KΩ orequivalent RT = ZOUT of pulse generator (typically 50Ω) SW IT CH Open VCC GND 5/9 5 Page

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Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
74VHCT257A	QUAD 2 CHANNEL MULTIPLEXER 3-STATE	STMicroelectronics
74VHCT257AM	QUAD 2 CHANNEL MULTIPLEXER 3-STATE	STMicroelectronics
74VHCT257AMTR	QUAD 2 CHANNEL MULTIPLEXER 3-STATE	STMicroelectronics
74VHCT257ATTR	QUAD 2 CHANNEL MULTIPLEXER 3-STATE	STMicroelectronics

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