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74AHCT257D Datenblatt(PDF) 5 Page - NXP Semiconductors |
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74AHCT257D Datenblatt(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 74AHC_AHCT257_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 9 May 2008 5 of 16 NXP Semiconductors 74AHC257; 74AHCT257 Quad 2-input multiplexer; 3-state 6. Functional description [1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state. 7. Limiting values [1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed. [2] For SO16 packages: above 70 °C the value of P tot derates linearly at 8 mW/K. For TSSOP16 packages: above 60 °C the value of P tot derates linearly at 5.5 mW/K. Table 3. Function table[1] Control Input Output OE S nI0 nI1 nY HX X X Z LH X L L XH H LL X L HX H Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V). Symbol Parameter Conditions Min Max Unit VCC supply voltage −0.5 +7.0 V VI input voltage −0.5 +7.0 V IIK input clamping current VI < −0.5 V [1] −20 - mA IOK output clamping current VO < −0.5 V or VO >VCC + 0.5 V [1] −20 +20 mA IO output current VO = −0.5 V to (VCC + 0.5 V) −25 +25 mA ICC supply current - +75 mA IGND ground current −75 - mA Tstg storage temperature −65 +150 °C Ptot total power dissipation Tamb = −40 °C to +125 °C [2] - 500 mW |
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