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5V925BQI8 Arkusz danych(PDF) 3 Page - Integrated Device Technology |
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5V925BQI8 Arkusz danych(HTML) 3 Page - Integrated Device Technology |
3 / 18 page IDT5V925BQGI REVISION B JANUARY 21, 2011 3 ©2011 Integrated Device Technology, Inc. IDT5V925BI Data Sheet PROGRAMMABLE LVCMOS/LVTTL CLOCK GENERATOR Function Tables Table 3A. Function Table NOTE 1: Operation in the specified CLKIN frequency range guarantees that the VCO will operate in the optimal range of 25MHz to 160MHz. Operation with CLKIN outside specified frequency ranges may result in invalid or out-of-lock outputs. NOTE 2: Q[2:0] are not allowed to be used as feedback. Table 3B. Divide Selection Table (1) NOTE 1: H = HIGH, M = MEDIUM, L = LOW. NOTE 2: Factory Test Mode: operation not specified. NOTE 3: Ethernet mode (use a 25MHz input frequency and Q/N as feedback). NOTE 4: Test mode for low frequency testing. In this mode, CLKIN bypasses the VCO (VCO powered down). Frequency must be > 1MHz due to dynamic circuits in the frequency dividers. Q[2:0] outputs are divided by 2 in test mode. Output Used for Feedback Allowable CLKIN Range (MHz) (1, 2) Output Frequency Relationships Minimum Maximum Q/N Q[2:0] Q/N 25/N 160/N CLKIN CLKIN x N S1 S0 Divide-by-N Value Mode L L Factory Test (2) LM 2 PLL LH 3 PLL ML 4 PLL MM 5(3) (default) PLL MH 6 PLL HL 7 PLL HM 8 PLL H H 16 TEST(4) |
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