74FCT388915TEJG8 IDT, 74FCT388915TEJG8 Datasheet - Page 7

• Manufacturer Part Number: 74FCT388915TEJG8
• Description: Clock Drivers & Distribution
• Manufacturer: IDT

Specifications of 74FCT388915TEJG8

• Rohs: yes
• Part # Aliases: IDT74FCT388915TEJG8

The frequency relationship shown here is applicable to all Q outputs (Q0, Q1,
Q2, Q3 and Q4).
1:2 INPUT TO "Q" OUTPUT
FREQUENCY RELATIONSHIP
internal PLL will line up the positive edges of Q/2 and SYNC, thus the Q/2
frequency will equal the SYNC frequency. The Q outputs (Q0-Q4, Q5) will
always run at 2X the Q/2 frequency, and the 2Q output will run at 4X the Q/2
frequency.
1:1 INPUT TO "Q" OUTPUT
FREQUENCY RELATIONSHIP
internal PLL will line up the positive edges of Q4 and SYNC, thus the Q4
frequency (and the rest of the "Q" outputs) will equal the SYNC frequency. The
Q/2 output will always run at 1/2 the Q frequency, and the 2Q output will run
at 2X the Q frequency.
12.5 MHz
input
IDT74FCT388915T
3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE)
Allowable Input Frequency Range:
10MHz to ( f2Q MAX Spec)/4 (for FREQ_SEL HIGH)
5MHz to (f2Q MAX Spec)/8 (for FREQ_SEL LOW)
Figure 3a. Wiring Diagram and Frequency Relationships With Q/
In this application, the Q/2 output is connected to the FEEDBACK input. The
In this application, the Q4 output is connected to the FEEDBACK input. The
LOW
FEEDBACK
REF_SEL
SYNC(0)
V
GND(AN)
FQ_SEL
LF
OE/
CC
HIGH
HIGH
12.5 M Hz feedback signal
(AN)
RST
2 Output Feedback
Q5
Q0
FCT388915T
Q1
Q4
PLL_EN
HIGH
2Q
50 M Hz signal
Q/2
Q3
Q2
25 MHz
Outputs
Clock
"Q"
7
25 MHz
input
2:1 INPUT TO "Q" OUTPUT
FREQUENCY RELATIONSHIP
internal PLL will line up the positive edges of 2Q and SYNC, thus the 2Q
frequency will equal the SYNC frequency. The Q/2 output will always run at
1/4 the 2Q frequency, and the Q output will run at 1/2 the 2Q frequency.
50 MHz
input
LOW
LOW
Allowable Input Frequency Range:
20MHz to (f2Q MAX Spec)/2 (for FREQ_SEL HIGH)
10MHz to (f2Q MAX Spec)/4 (for FREQ_SEL LOW)
Allowable Input Frequency Range:
40MHz to (f2Q MAX Spec) (for FREQ_SEL HIGH)
20MHz to (f2Q MAX Spec)/2 (for FREQ_SEL LOW)
In this application, the 2Q output is connected to the FEEDBACK input. The
Figure 3b. Wiring Diagram and Frequency Relationships With
Figure 3c. Wiring Diagram and Frequency Relationships With
25 MHz feedback signal
FEEDBACK
REF_SEL
SYNC(0)
V
LF
GND(AN)
FQ_SEL
FEEDBACK
REF_SEL
SYNC(0)
V
GND(AN)
FQ_SEL
LF
50 MHz feedback signal
OE/
OE/
CC
CC
HIGH
HIGH
HIGH
HIGH
(AN)
(AN)
RST
RST
Q5
Q0
Q 0
Q4 Output Feedback
2Q Output Feedback
Q5
FCT388915T
FCT388915T
COMMERCIAL TEMPERATURE RANGE
Q1
Q4
Q1
Q4
PLL_EN
PLL_EN
HIGH
HIGH
2Q
2Q
50 MHz signal
Q/2
Q3
Q2
Q/2
Q3
Q2
12.5 MHz
input
12.5 MHz
signal
25 MHz
O utputs
25 MHz
Outputs
Clock
Clock
"Q"
"Q"