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8 / 10 page COMMERCIALTEMPERATURERANGE 8 IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) CMMU CM MU CPU CM MU CMMU CM MU CMMU CM MU CPU CM MU CMMU CM MU PLL 2f PLL 2f CPU CARD CPU CARD CLOCK @f SYSTEM CLO CK SO UR CE FCT388915T FCT388915T DISTRIBUTE CLO CK @ f CLOCK @ 2f at point of use MEMORY CO NTROL PLL 2f MEMORY CAR DS CLOCK @ 2f at point of use FCT388915T Figure 4. Multiprocessing Application Using the FCT388915T for Frequency Multiplication and Low Board-to-Board skew FCT388915T SYSTEM LEVEL TESTING FUNCTIONALITY When the PLL_EN pin is LOW, the PLL is bypassed and the FCT388915T is in low frequency "test mode". In test mode (with FREQ_SEL HIGH), the 2Q output is inverted from the selected SYNC input, and the Q outputs are divide- by-2 (negative edge triggered) of the SYNC input, and the Q/2 output is divide- by-4(negativeedgetriggered). WithFREQ_SELLOWthe2Qoutputisdivide- by-2 of the SYNC, the Q outputs divide-by-4, and the Q/2 output divide-by-8. These relationships can be seen in the block diagram. A recommended test configuration would be to use SYNC0 or SYNC1 as the test clock input, and tie PLL_EN and REF_SEL together and connect them to the test select logic. This functionality is needed since most board-level testers run at 1 MHz or below, and theFCT 388915T cannot lock onto that low of an input frequency. In the test mode described above, any test frequency test can be used. |
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