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CS49311 Datasheet(PDF) 9 Page - Cirrus Logic |
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CS49311 Datasheet(HTML) 9 Page - Cirrus Logic |
9 / 90 page CS49300 Family DSP DS339F7 9 1.6. Switching Characteristics — RESET (VA, VD[3:1] = 2.5 V ±5%; Inputs: Logic 0 = DGND, Logic 1 = VD, CL = 20 pF) Notes: 5. The minimum RESET pulse listed above is valid only when using the recommended pull-up/pull-down resistors on the RD, WR, PSEL and ABOOT mode pins. For Rev. D and older parts, pull-up/pull-down resistors may be 4.7 k or 3.3 k. For Rev. E and newer parts, pull-up/pull-down resistors must be 3.3 k. 6. This specification is characterized but not production tested. 1.7. Switching Characteristics — CLKIN (VA, VD[3:1] = 2.5 V ±5%; Inputs: Logic 0 = DGND, Logic 1 = VD, CL = 20 pF, PLL Enabled) Parameter Symbol Min Max Unit RESET minimum pulse width low (-CL) (Note 5) Trstl 100 - µs RESET minimum pulse width low (-IL) (Note 5) Trstl 530 - µs All bidirectional pins high-Z after RESET low (Note 6) Trst2z -100 ns Configuration bits setup before RESET high Trstsu 50 - ns Configuration bits hold after RESET high Trsthld 15 - ns RESET T rst2z T rstl T rstsu T rsthld RD, WR, PSEL, ABOOT All Bidirectional Pins Figure 1. RESET Timing Parameter Symbol Min Max Unit CLKIN period for internal DSP clock mode Tclki 35 3800 ns CLKIN high time for internal DSP clock mode Tclkih 14 - ns CLKIN low time for internal DSP clock mode Tclkil 14 - ns CLKIN Tclkih Tclkil Tclki Figure 2. CLKIN with CLKSEL = VSS = PLL Enable |
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