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54LS197 датащи(PDF) 5 Page - Motorola, Inc |
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54LS197 датащи(HTML) 5 Page - Motorola, Inc |
5 / 6 page 5-5 FAST AND LS TTL DATA SN54/74LS196 • SN54/74LS197 AC CHARACTERISTICS (TA = 25°C) Sb l P Limits Ui T C di i Sb l P LS196 LS197 Ui T C di i Symbol Parameter Min Typ Max Min Typ Max Unit Test Conditions fMAX Maximum Clock Frequency 30 40 30 40 MHz V5 0 V tPLH tPHL CP0 Input to Q0 Output 8.0 13 15 20 8.0 14 15 21 ns V5 0 V tPLH tPHL CP1 Input to Q1 Output 16 22 24 33 12 23 19 35 ns V5 0 V tPLH tPHL CP1 Input to Q2 Output 38 41 57 62 34 42 51 63 ns VCC = 5.0 V tPLH tPHL CP1 Input to Q3 Output 12 30 18 45 55 63 78 95 ns CC CL = 15 pF tPLH tPHL Data to Output 20 29 30 44 18 29 27 44 ns tPLH tPHL PL Input to Any Output 27 30 41 45 26 30 39 45 ns tPHL MR Input to Any Output 34 51 34 51 ns AC SETUP REQUIREMENTS (TA = 25°C) Sb l P Limits Ui T C di i Sb l P LS196 LS197 Ui T C di i Symbol Parameter Min Typ Max Min Typ Max Unit Test Conditions tW CP0 Pulse Width 20 20 ns V5 0 V tW CP1 Pulse Width 30 30 ns V5 0 V tW PL Pulse Width 20 20 ns V5 0 V tW MR Pulse Width 15 15 ns V5 0 V ts Data Input Setup Time — HIGH 10 10 ns VCC = 5.0 V ts Data Input Setup Time — LOW 15 15 ns th Data Hold Time — HIGH 10 10 ns th Data Hold Time — LOW 10 10 ns trec Recovery Time 30 30 ns DEFINITIONS OF TERMS SETUP TIME (ts) — is defined as the minimum time required for the correct logic level to be present at the logic input prior to the clock transition from HIGH to LOW in order to be recog- nized and transferred to the outputs. HOLD TIME (th) — is defined as the minimum time following the clock transition from HIGH to LOW that the logic level must be maintained at the input in order to ensure continued recog- nition. A negative HOLD TIME indicates that the correct logic level may be released prior to the clock transition from HIGH to LOW and still be recognized. RECOVERY TIME (trec) — is defined as the minimum time required between the end of the reset pulse and the clock transition from HIGH to LOW in order to recognize and transfer LOW Data to the Q outputs. |
Аналогичный номер детали - 54LS197 |
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Аналогичное описание - 54LS197 |
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