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SN74AHCT245DBR 데이터시트(PDF) 5 Page - Texas Instruments |
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SN74AHCT245DBR 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 32 page SN54AHCT245, SN74AHCT245 www.ti.com SCLS233P – OCTOBER 1995 – REVISED JULY 2014 7.4 Thermal Information SN74AHCT245 THERMAL METRIC(1) DB DGV DW N NS PW RGY UNIT 20 PINS Junction-to-ambient thermal RθJA 96.0 116.1 79.8 51.5 77.1 102.8 35.1 resistance Junction-to-case (top) thermal RθJC(top) 57.7 31.3 45.8 38.2 43.6 36.8 43.3 resistance RθJB Junction-to-board thermal resistance 51.2 57.6 47.4 32.4 44.6 53.8 12.9 °C/W Junction-to-top characterization ψJT 19.4 1.0 18.5 24.6 17.2 2.5 0.9 parameter Junction-to-board characterization ψJB 50.8 56.9 47.0 32.3 44.2 53.3 12.9 parameter Junction-to-case (bottom) thermal RθJC(bot) n/a n/a n/a n/a n/a n/a 7.9 resistance (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 7.5 Electrical Characteristics over recommended operating free-air temperature range (unless otherwise noted) Recommended SN54AHCT245 SN74AHCT245 TA = 25°C SN74AHCT245 –55°C TO 125°C –40°C TO 85°C PARAMETER TEST CONDITIONS VCC UNIT –40°C TO 125°C MIN TYP MAX MIN MAX MIN MAX MIN MAX IOH = –50 µA 4.4 4.5 4.4 4.4 4.4 VOH 4.5 V V IOH = –8 mA 3.94 3.8 3.8 3.7 IOL = 50 µA 0.1 0.1 0.1 0.1 VOL 4.5 V V IOH = 8 mA 0.36 0.44 0.44 0.44 0 to II OE or DIR VI = 5.5 V or GND ±0.1 ±1(1) ±1 ±1 µA 5.5 V A or B IOZ VO = VCC or GND 5.5 V ±.25 ±2.5 ±2.5 ±2.5 µA inputs(2) ICC VI = VCC or GND, IO = 0 5.5 V 4 40 40 40 µA One input at 3.4 V, ΔICC (3) 5.5 V 1.35 1.5 1.5 1.5 mA Other inputs at VCC or GND Ci OE or DIR VI = VCC or GND 5 V 2.5 10 10 pF A or B Cio VI = VCC or GND 5 V 4 pF inputs (1) On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V. (2) For I/O ports, the parameter IOZ includes the input leakage current. (3) This is the increase in supply current for each input at one of the specified TTL voltage levels, rather than 0 V or VCC. Copyright © 1995–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: SN54AHCT245 SN74AHCT245 |
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