전자부품 데이터시트 검색엔진 |
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CD54ACT257F3A 데이터시트(PDF) 6 Page - Texas Instruments |
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CD54ACT257F3A 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 17 page 6 Propagation Delay, OE to Y AC/ACT257 tPLZ, tPHZ, tPZL, tPZH 5 4.1 - 14.6 4 - 16.1 ns Propagation Delay, In to Y ’AC/CD74ACT258 tPLH, tPHL 5 2.4 - 8.5 2.3 - 9.3 ns Propagation Delay, S to Y ’AC/CD74ACT258 tPLH, tPHL 5 4 - 14 3.9 - 15.4 ns Propagation Delay, OE to Y ’AC/CD74ACT258 tPLZ, tPHZ, tPZL, tPZH 5 4.1 - 14.6 4 - 16.1 ns Three-State Output Capacitance CO - - -15- -15 pF Input Capacitance CI - - -10- -10 pF Power Dissipation Capacitance CPD (Note 11) - - 130 - - 130 - pF NOTES: 8. Limits tested 100%. 9. 3.3V Min is at 3.6V, Max is at 3V. 10. 5V Min is at 5.5V, Max is at 4.5V. 11. CPD is used to determine the dynamic power consumption per multiplexer. AC: PD = CPD VCC 2 f i + ∑ (CL VCC 2 f o) ACT: PD =CPD VCC 2 f i + ∑ (CL VCC 2 f o)+VCC ∆ICC where fi = input frequency, fo = output frequency, CL = output load capacitance, VCC = supply voltage. FIGURE 1. THREE-STATE PROPAGATION DELAY TIMES AND TEST CIRCUIT Switching Specifications Input tr, tf = 3ns, CL = 50pF (Worst Case) (Continued) PARAMETER SYMBOL VCC (V) -40oC TO 85oC -55oC TO 125oC UNITS MIN TYP MAX MIN TYP MAX DUT WITH THREE- STATE OUTPUT INPUT LEVEL 90% VS 10% GND tf = 3ns tPZL tPZH tPLZ tPHZ OUTPUTS ENABLED OUTPUTS DISABLED OUTPUT: LOW TO OFF TO LOW OUTPUT: HIGH TO OFF TO HIGH OTHER INPUTS (TIED HIGH OR LOW) OUTPUT DISABLE CL 50pF 500Ω† RL 500Ω† RL OUT VS 0.2VCC VOL (≠GND) VOH (≠VCC) 0.8 VCC VS GND (tPHZ, tPZH) OUTPUTS ENABLED OPEN (tPHL, tPLH) 2 VCC (tPLZ, tPZL) (OPEN DRAIN) tr = 3ns OUTPUT DISABLE †FOR AC SERIES ONLY: WHEN VCC = 1.5V, RL = 1kΩ CD54/74AC257, CD54/74ACT257, CD74ACT258 |
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