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HEF4521B Datasheet(PDF) 5 Page - NXP Semiconductors |
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HEF4521B Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 11 page  January 1995 5 Philips Semiconductors Product specification 24-stage frequency divider and oscillator HEF4521B MSI AC CHARACTERISTICS VSS = 0 V; Tamb =25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V SYMBOL MIN. TYP. MAX. TYPICAL EXTRAPOLATION FORMULA Propagation delays I2 → O18 5 950 1900 ns 923 ns + (0,55 ns/pF) CL HIGH to LOW 10 tPHL 350 700 ns 339 ns + (0,23 ns/pF) CL 15 220 440 ns 212 ns + (0,16 ns/pF) CL 5 950 1900 ns 923 ns + (0,55 ns/pF) CL LOW to HIGH 10 tPLH 350 700 ns 339 ns + (0,23 ns/pF) CL 15 220 440 ns 212 ns + (0,16 ns/pF) CL On → On + 1 5 40 80 ns 13 ns + (0,55 ns/pF) CL HIGH to LOW 10 tPHL 15 30 ns 4 ns + (0,23 ns/pF) CL 15 10 20 ns 2 ns + (0,16 ns/pF) CL 5 40 80 ns 13 ns + (0,55 ns/pF) CL LOW to HIGH 10 tPLH 15 30 ns 4 ns + (0,23 ns/pF) CL 15 10 20 ns 2 ns + (0,16 ns/pF) CL MR → On 5 120 240 ns 93 ns + (0,55 ns/pF) CL HIGH to LOW 10 tPHL 55 110 ns 44 ns + (0,23 ns/pF) CL 15 40 80 ns 32 ns + (0,16 ns/pF) CL I1 → O1 5 90 180 ns 63 ns + (0,55 ns/pF) CL HIGH to LOW 10 tPHL 35 70 ns 24 ns + (0,23 ns/pF) CL 15 25 50 ns 17 ns + (0,16 ns/pF) CL 5 60 120 ns 33 ns + (0,55 ns/pF) CL LOW to HIGH 10 tPLH 30 60 ns 19 ns + (0,23 ns/pF) CL 15 20 40 ns 12 ns + (0,16 ns/pF) CL Fig.4 Schematic diagram of clock input circuitry. |
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