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74HCT244DB Datasheet(PDF) 4 Page - NXP Semiconductors |
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74HCT244DB Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 18 page 74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 24 September 2012 4 of 18 NXP Semiconductors 74HC244; 74HCT244 Octal buffer/line driver; 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] For DIP20 package: Ptot derates linearly with 12 mW/K above 70 C. [2] For SO20 packages: Ptot derates linearly with 8 mW/K above 70 C. For SSOP20 and TSSOP20 packages: Ptot derates linearly with 5.5 mW/K above 60 C. For DHVQFN20 packages: above 60 C, P tot derates linearly with 4.5 mW/K. 8. Recommended operating conditions Table 3. Function table[1] Input Output nOE nAn nYn LLL LH H HX Z 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 V IIK input clamping current VI < 0.5 V or VI >VCC +0.5 V - 20 mA IOK output clamping current VO < 0.5 V or VO >VCC +0.5 V - 20 mA IO output current 0.5 V < V O < VCC +0.5 V - 35 mA ICC supply current - 70 mA IGND ground current 70 - mA Tstg storage temperature 65 +150 C Ptot total power dissipation DIP20 package [1] - 750 mW SO20, SSOP20, TSSOP20 and DHVQFN20 packages [2] - 500 mW Table 5. Recommended operating conditions Symbol Parameter Conditions Min Typ Max Unit 74HC244 VCC supply voltage 2.0 5.0 6.0 V VI input voltage 0 - VCC V VO output voltage 0 - VCC V t/V input transition rise and fall rate VCC = 2.0 V - - 625 ns/V VCC = 4.5 V - 1.67 139 ns/V VCC = 6.0 V - - 83 ns/V Tamb ambient temperature 40 - +125 C |
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