Datenblatt-Suchmaschine für elektronische Bauteile |
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MC74VHCT245A Datenblatt(PDF) 2 Page - ON Semiconductor |
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MC74VHCT245A Datenblatt(HTML) 2 Page - ON Semiconductor |
2 / 7 page MC74VHCT245A http://onsemi.com 2 Figure 1. Logic Diagram A DATA PORT A8 A7 A6 A5 A3 A4 A2 A1 9 8 7 6 5 4 3 2 DIR OE 1 19 18 17 16 15 14 13 12 11 B1 B2 B3 B4 B5 B6 B7 B8 B DATA PORT Figure 2. Pin Assignment A5 A3 A2 A1 DIR GND A8 A7 A6 A4 5 4 3 2 1 10 9 8 7 6 14 15 16 17 18 19 20 11 12 13 B3 B2 B1 OE VCC B8 B7 B6 B5 B4 OE DIR Operation L L H L H X Data Tx from Bus B to Bus A Data Tx from Bus A to Bus B Buses Isolated (High−Z State) Control Inputs FUNCTION TABLE MAXIMUM RATINGS Symbol Parameter Value Unit VCC DC Supply Voltage – 0.5 to + 7.0 V Vin DC Input Voltage – 0.5 to + 7.0 V VI/O DC Output Voltage Outputs in 3−State High or Low State – 0.5 to + 7.0 – 0.5 to VCC + 0.5 V IIK Input Diode Current − 20 mA IOK Output Diode Current (VOUT < GND; VOUT > VCC) ± 20 mA Iout DC Output Current, per Pin ± 25 mA ICC DC Supply Current, VCC and GND Pins ± 75 mA PD Power Dissipation in Still Air, SOIC Package† TSSOP Package† 500 450 mW Tstg Storage Temperature – 65 to + 150 _C Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. †Derating − SOIC Package: – 7 mW/ _C from 65_ to 125_C TSSOP Package: − 6.1 mW/ _C from 65_ to 125_C RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit VCC DC Supply Voltage 4.5 5.5 V Vin DC Input Voltage 0 5.5 V VI/O DC Output Voltage Outputs in 3−State High or Low State 0 0 5.5 VCC V TA Operating Temperature − 40 + 85 _C tr, tf Input Rise and Fall Time VCC =5.0V ±0.5V 0 20 ns/V Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high−impedance cir- cuit. For proper operation, Vin and Vout should be constrained to the range GND v (Vin or Vout) v VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open. |
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