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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMS320DM641 датащи(PDF) 102 Page - Texas Instruments |
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TMS320DM641 датащи(HTML) 102 Page - Texas Instruments |
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102 / 171 page  Clock PLL 102 June 2003 − Revised August 2004 SPRS222C Table 4−15. Timing Requirements for CLKIN for −600 Devices†‡§ (see Figure 4−11) −600 NO. PLL MODE x12 PLL MODE x6 x1 (BYPASS) UNIT NO. MIN MAX MIN MAX MIN MAX UNIT 1 tc(CLKIN) Cycle time, CLKIN 20 33.3 13.3 33.3 13.3 33.3 ns 2 tw(CLKINH) Pulse duration, CLKIN high 0.45C 0.45C 0.45C ns 3 tw(CLKINL) Pulse duration, CLKIN low 0.45C 0.45C 0.45C ns 4 tt(CLKIN) Transition time, CLKIN 5 5 1 ns 5 tJ(CLKIN) Period jitter, CLKIN 0.02C 0.02C 0.02C ns † The reference points for the rise and fall transitions are measured at VIL MAX and VIH MIN. ‡ For more details on the PLL multiplier factors (x6, x12), see the Clock PLL section of this data sheet. § C = CLKIN cycle time in ns. For example, when CLKIN frequency is 50 MHz, use C = 20 ns. CLKIN 2 3 4 4 5 1 Figure 4−11. CLKIN Timing Table 4−16. Switching Characteristics Over Recommended Operating Conditions for CLKOUT4†‡§ (see Figure 4−12) NO. PARAMETER −400 −500 −600 UNIT NO. PARAMETER CLKMODE = x1, x6, x12 UNIT MIN MAX 1 tw(CKO4H) Pulse duration, CLKOUT4 high 2P − 0.7 2P + 0.7 ns 2 tw(CKO4L) Pulse duration, CLKOUT4 low 2P − 0.7 2P + 0.7 ns 3 tt(CKO4) Transition time, CLKOUT4 1 ns † The reference points for the rise and fall transitions are measured at VOL MAX and VOH MIN. ‡ PH is the high period of CLKIN in ns and PL is the low period of CLKIN in ns. § P = 1/CPU clock frequency in nanoseconds (ns) CLKOUT4 1 2 3 3 Figure 4−12. CLKOUT4 Timing |
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