IDT74FCT88915TT70PY IDT, Integrated Device Technology Inc, IDT74FCT88915TT70PY Datasheet - Page 9

• Manufacturer Part Number: IDT74FCT88915TT70PY
• Description: IC PLL CLK GENERATOR 28-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: 74FCTr
• Type: Fanout Distribution, Multiplexer , Zero Delay Bufferr

Specifications of IDT74FCT88915TT70PY

• Pll: Yes with Bypass
• Input: LVTTL
• Output: LVCMOS, LVTTL
• Number Of Circuits: 1
• Ratio - Input:output: 2:8
• Differential - Input:output: No/No
• Frequency - Max: 70MHz
• Divider/multiplier: Yes/Yes
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: *
• Frequency-max: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 74FCT88915TT70PY

FCT88915 SYSTEM LEVEL TESTING FUNCTIONALITY
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 (negative edge triggered). With FREQ_SEL LOW the 2Q output is divide-
by-2 of the SYNC, the Q outputs divide-by-4, and the Q/2 output divide-by-8.
IDT74FCT88915TT
LOW SKEW PLL-BASED CMOS CLOCK DRIVER
When the PLL_EN pin is LOW, the PLL is bypassed and the FCT88915TT
DISTRIBUTE
at point of use
CLOCK @ 2f
CLOCK @ f
Figure 5. Multiprocessing Application Using the FCT88915 for Frequency Multiplication
SOURCE
SYSTEM
CLOCK
CLOCK
@ f
FCT88915TT
FCT88915TT
and Low Board-to-Board skew
PLL
PLL
2f
2f
FCT88915TT
PLL
ME MO RY
CARDS
CM M U
CM M U
CM M U
CM M U
2f
9
CPU
CPU
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.
below, and the FCT88915TT cannot lock onto that low of an input frequency.
In the test mode described above, any test frequency test can be used.
This functionality is needed since most board-level testers run at 1 MHz or
ME MO RY
CONTROL
CM M U
CM M U
CM M U
CM M U
CM M U
CM M U
at point of use
CLOCK @ 2f
CARD
CARD
CPU
CPU
COMMERCIAL TEMPERATURE RANGE