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M74HCT646 Scheda tecnica(PDF) 7 Page - STMicroelectronics |
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M74HCT646 Scheda tecnica(HTML) 7 Page - STMicroelectronics |
7 / 12 page AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns) Symbol Parameter Test Conditions Value Unit VCC (V) CL (pF) TA =25 oC 54HC and 74HC -40 to 85 oC 74HC Min. Typ. Max. Min. Max. tTLH tTHL Output Transition Time 4.5 50 7 12 15 ns tPLH tPHL Propagation Delay Time (BUS - BUS) 4.5 50 20 30 38 ns 4.5 150 25 38 48 ns tPLH tPHL Propagation Delay Time (CLOCK - BUS) 4.5 50 29 44 55 ns 4.5 150 34 52 65 ns tPLH tPHL Propagation Delay Time (SELECT - BUS) 4.5 50 24 34 43 ns 4.5 150 29 42 53 ns tPZL tPZH 3-State Output Enable Time (G, DIR - BUS) 4.5 50 RL =1 K Ω 26 38 48 ns 4.5 150 RL =1 K Ω 31 46 58 ns tPLZ tPHZ 3-State Output Disable Time (G, DIR - BUS) 4.5 50 RL =1 K Ω 26 35 44 ns fMAX Maximum Clock Frequency 4.5 50 31 55 25 MHz tW(H) tW(L) Minimum Pulse Width 4.5 50 8 15 19 ns ts Minimum Set-up Time 4.5 50 3 10 13 ns th Minimum Hold Time 4.5 50 5 5 ns CIN Input Capacitance 5 10 10 pF CI/O Bus Terminal Capacitance 13 pF CPD (*) Power Dissipation Capacitance for HCT646 for HCT648 40 39 pF (*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN +ICC/8 (per bit) M74HCT646/648 7/12 |
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