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FIN212AC Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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FIN212AC Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 22 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FIN212AC Rev. 1.0.1 7 Pulse Width Calculations Pulse Width Low Tpwl = (divOut*Pwdth)/(CKREF*14) To meet minimum pulse width specification, divOut*Pwdth≥Tpwl*(TCKREF*14). Bit times based on PWS0, PWS1 (Pwdth = 7, 13, 17), divide by divOut = 0.954, 1, 2, 3. Example: Tpwl=60ns CKREF=26MHz CKP Pulsewidth = (2*13)/(26MHz*14) if DivOut=2, Pwdth=13 bitTimes=26. Tpwl=71.4ns PLL1 PLL0 PWS1 PWS0 19.2MHz 26Mhz 0000 0.954 7 6.7 24.8 18.3 0001 0.954 7 6.7 24.8 18.3 0010 0.954 13 12.4 46.1 34.1 0011 0.954 17 16.2 60.3 44.6 0100 1 7 726.0 19.2 0101 1 7 726.0 19.2 0110 1 13 13 48.4 35.7 0111 1 17 17 63.2 46.7 1000 2 7 14 52.1 38.5 1001 2 7 14 52.1 38.5 1010 2 13 26 96.7 71.4 1011 2 17 34 126.5 93.4 1100 3 7 21 78.1 57.7 1101 3 7 21 78.1 57.7 1110 3 13 39 145.1 107.1 1111 3 17 51 189.7 140.1 Serializer Setup Deserializer Setup CKREF Frequency CKP-PWL Bit Times Pwidth PLL DivOut Table 8. CKP Pulse Widths (in nanoseconds) for Standard Cell Phone Operating Frequencies (5) Note: 5. CKP Pwidth assumes minimal slew rate at the 50% transition point. |
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Descripción similar - FIN212AC |
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