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SN74148 数据表(PDF) 7 Page - Texas Instruments |
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SN74148 数据表(HTML) 7 Page - Texas Instruments |
7 / 26 page SN54147, SN54148, SN54LS147, SN54LS148 SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148 10LINE TO 4LINE AND 8LINE TO 3LINE PRIORITY ENCODERS SDLS053B − OCTOBER 1976 − REVISED MAY 2004 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Supply voltage, VCC (see Note 1) 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage, VI: ’147, ’148 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ’LS147, ’LS148 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inter-emitter voltage: ’148 only (see Note 2) 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Package thermal impedance θJA (see Note 3): D package 73 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N package 67 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NS package 64 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg −65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Voltage values, except inter-emitter voltage, are with respect to the network ground terminal. 2. This is the voltage between two emitters of a multiple-emitter transistor. For ’148 circuits, this rating applies between any two of the eight data lines, 0 through 7. 3. The package thermal impedance is calculated in accordance with JESD 51-7. recommended operating conditions (see Note 4) SN54’ SN74’ SN54LS’ SN74LS’ UNIT MIN NOM MAX MIN NOM MAX MIN NOM MAX MIN NOM MAX UNIT VCC Supply voltage 4.5 5 5.5 4.75 5 5.25 4.5 5 5.5 4.75 5 5.25 V IOH High-level output current −800 −800 −400 −400 µA IOL Low-level output current 16 16 4 8 mA TA Operating free-air temperature −55 125 0 70 −55 125 0 70 °C NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. |
类似零件编号 - SN74148 |
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类似说明 - SN74148 |
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