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TMS320F28026DA Datasheet(PDF) 32 Page - Texas Instruments |
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TMS320F28026DA Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 147 page  8.13.2 Clock Requirements and Characteristics 8.13.2.1 XCLKIN Timing Requirements – PLL Enabled NO. MIN MAX UNIT C9 tf(CI) Fall time, XCLKIN 6 ns C10 tr(CI) Rise time, XCLKIN 6 ns C11 tw(CIL) Pulse duration, XCLKIN low as a percentage of tc(OSCCLK) 45% 55% C12 tw(CIH) Pulse duration, XCLKIN high as a percentage of tc(OSCCLK) 45% 55% 8.13.2.2 XCLKIN Timing Requirements – PLL Disabled NO. MIN MAX UNIT C9 tf(Cl) Fall time, XCLKIN Up to 20 MHz 6 ns 20 MHz to 30 MHz 2 C10 tr(CI) Rise time, XCLKIN Up to 20 MHz 6 ns 20 MHz to 30 MHz 2 C11 tw(CIL) Pulse duration, XCLKIN low as a percentage of tc(OSCCLK) 45% 55% C12 tw(CIH) Pulse duration, XCLKIN high as a percentage of tc(OSCCLK) 45% 55% The possible configuration modes are shown in Table 9-16. 8.13.2.3 XCLKOUT Switching Characteristics (PLL Bypassed or Enabled) over recommended operating conditions (unless otherwise noted)(1) (2) NO. PARAMETER MIN MAX UNIT C3 tf(XCO) Fall time, XCLKOUT 11 ns C4 tr(XCO) Rise time, XCLKOUT 11 ns C5 tw(XCOL) Pulse duration, XCLKOUT low H – 2 H + 2 ns C6 tw(XCOH) Pulse duration, XCLKOUT high H – 2 H + 2 ns (1) A load of 40 pF is assumed for these parameters. (2) H = 0.5tc(XCO) C4 C3 XCLKOUT(B) XCLKIN(A) C5 C9 C10 C1 C8 C6 A. The relationship of XCLKIN to XCLKOUT depends on the divide factor chosen. The waveform relationship shown is intended to illustrate the timing parameters only and may differ based on actual configuration. B. XCLKOUT configured to reflect SYSCLKOUT. Figure 8-9. Clock Timing TMS320F28027, TMS320F28027-Q1, TMS320F28027F, TMS320F28027F-Q1, TMS320F28026 TMS320F28026-Q1, TMS320F28026F, TMS320F28026F-Q1, TMS320F28023 TMS320F28023-Q1, TMS320F28022, TMS320F28021, TMS320F28020, TMS320F280200 SPRS523P – NOVEMBER 2008 – REVISED FEBRUARY 2021 www.ti.com 32 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TMS320F28027 TMS320F28027-Q1 TMS320F28027F TMS320F28027F-Q1 TMS320F28026 TMS320F28026-Q1 TMS320F28026F TMS320F28026F-Q1 TMS320F28023 TMS320F28023- Q1 TMS320F28022 TMS320F28021 TMS320F28020 TMS320F280200 |
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