9170B-01CS08LF Datasheet, PDF (2/12 Pages) Integrated Device Technology – CLOCK SYNCHRONIZER AND MULTIPLIER

IDT9170B
CLOCK SYNCHRONIZER AND MULTIPLIER
CLOCK SYNTHESIZER
Pin Assignment
FBIN
1
IN
2
GND
3
FS0
4
8 CLK2
7 VDD
6 CLK1
5 FS1
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
FBIN
IN
GND
FS0
FS1
CLK1
VDD
CLK2
Pin
Type
Input
Input
Power
Input
Input
Output
Power
Output
Pin Description
Feedback input.
Input for reference clock.
Connect to ground.
Frequency select 0.
Frequency select 1.
Clock output 1. See tables 1, 2 for values.
Power supply.
Clock output 2. See tables 1, 2 for values.
Using the IDT9170B
The IDT9170B has the following characteristics:
1. Rising edges at IN and FBIN are lined up. Falling edges
are not synchronized.
2. The relationship between the frequencies at FBIN and IN
with CLK1 feedback is shown in Table 1 below.
Functionality (Table 1)
FS1 FS0
00
01
10
11
f_FBIN (-01, -02)
2 * f_IN
4 * f_IN
f_IN
8 * f_IN
3. The frequency of CLK2 is half the CLK1 frequency.
4. The CLK1 frequency ranges are:
IDT9170B-01
IDT9170B-02
20 < f_CLK1
5 < f_CLK1
VDD=5 V VDD=3.3 V
<107 MHz
<66.7
<26.75 MHz <16.7
Eliminate High Speed Clock Routing Problems
The IDT9170B makes it possible to route lower speed clocks
over long distances on the PC board and to place an
IDT9170B next to the device requiring a higher speed clock.
The multiplied output can then be used to produce a phase
locked, higher speed output clock.
Compensate for Propagation Delays
Including an IDT9170B in a timing loop allows the use of
PALs, gate arrays, etc., with loose timing specifications. The
IDT9170B compensates for the delay through the PAL and
synchronizes the output to the input reference clock.
IDT™ CLOCK SYNCHRONIZER AND MULTIPLIER
2
IDT9170B
REV B 052609