IDT74FCT88915TT70PY IDT, Integrated Device Technology Inc, IDT74FCT88915TT70PY Datasheet - Page 6

• 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

9. The t
GENERAL AC SPECIFICATION NOTES, CONTINUED
8. The wiring diagrams and written explanations of Figures 4a-4c demonstrate the input and output frequency relationships for various possible feedback configurations. The allowable
IDT74FCT88915TT
LOW SKEW PLL-BASED CMOS CLOCK DRIVER
SYNC input range to stay in the phase-locked condition is also indicated. There are two allowable SYNC frequency ranges, depending on whether FREQ_SEL is HIGH or LOW.
Also, it is possible to feed back the Q5 output, thus creating a 180° phase shift between the SYNC input and the Q outputs. The table below summarizes the allowable SYNC
frequency range for each possible configuration:
measurements were made at 1.5V. The Q/2 output was terminated at the FEEDBACK input with 100Ω to V
filter connection shown in Figure 2 below:
FREQ_SEL
PD
HIGH
HIGH
HIGH
HIGH
Level
LOW
LOW
LOW
LOW
spec describes how the phase offset between the SYNC input and the output connected to the FEEDBACK input varies with process, temperature, and voltage. The phase
Any Q (Q0-Q4)
Any Q (Q0-Q4)
Feedback
Output
Q/2
Q/2
Q5
2Q
Q5
2Q
External Loop
Filter
Frequency Range (MHz)
Allowable SYNC Input
10 to (2Q f
20 to (2Q f
20 to (2Q f
10 to (2Q f
10 to (2Q f
20 to (2Q f
5 to (2Q f
40 to (2Q f
Figure 2. Loop Filter Connection
MAX
MAX
MAX
MAX
MAX
MAX
MAX
MAX
Spec)/8
Spec)/4
Spec)/2
Spec)/2
Spec)/4
Spec)/4
Spec)/2
Spec)
0.1µF
6
LF
C1
Corresponding 2Q Output
Analog GND
20 to (2Q f
20 to (2Q f
20 to (2Q f
20 to (2Q f
40 to (2Q f
40 to (2Q f
40 to (2Q f
40 to (2Q f
Frequency Range
CC
and 100Ω to ground. t
MAX
MAX
MAX
MAX
MAX
MAX
MAX
MAX
Spec)/2
Spec)/2
Spec)/2
Spec)/2
Spec)
Spec)
Spec)
Spec)
COMMERCIAL TEMPERATURE RANGE
PD
measurements were made with the loop
to Rising SYNC Edge
Phase Relationship
of the Q Outputs
180°
180°
0°
0°
0°
0°
0°
0°