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Cypress Semiconductor Electronic Components Datasheet

W170 Datasheet

Spread Aware/ Frequency Multiplier and Zero Delay Buffer

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W170 pdf
W170-01
Spread Aware™, Frequency Multiplier and Zero Delay Buffer
Features
• Spread Aware™—designed to work with SSFTG
reference signals
• Two outputs
• Configuration options allow various multiplication of
the reference frequency, refer to Table 1 to determine
the specific option which meets your multiplication
needs
• Available in 8-pin SOIC package
Key Specifications
Operating Voltage: ...........................3.3V±5% or 5.0V± 10%
Operating Range: .......................20 MHz < fOUT1 < 133 MHz
Absolute Jitter: ......................................................... ±500 ps
Output to Output Skew: .............................................. 250 ps
Propagation Delay: ................................................... ±350 ps
Propagation delay is affected by input rise time.
Table 1. Configuration Options
FBIN
FS0 FS1
OUT1
OUT1
0
0 2 X REF
OUT1
1
0 4 X REF
OUT1
0
1
REF
OUT1
1
1 8 X REF
OUT2
0
0 4 X REF
OUT2
1
0 8 X REF
OUT2
0
1 2 X REF
OUT2
1
1 16 X REF
OUT2
REF
2 X REF
REF/2
4 X REF
2 X REF
4 X REF
REF
8 X REF
Block Diagram
Pin Configuration
FBIN
FS0
÷Q
FS1
External feedback connection to
OUT1 or OUT2, not both
FBIN
IN
GND
FS0
1
2
3
4
8 OUT2
7 VDD
6 OUT1
5 FS1
IN
Reference
Input
Phase
Detector
Charge
Pump
Loop
Filter
Output
Buffer
VCO
÷2
Output
Buffer
OUT1
OUT2
Spread Aware is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
September 28, 1999, rev. **


Cypress Semiconductor Electronic Components Datasheet

W170 Datasheet

Spread Aware/ Frequency Multiplier and Zero Delay Buffer

No Preview Available !

W170 pdf
W170-01
Pin Definitions
Pin Name
IN
FBIN
Pin No.
2
1
OUT1
OUT2
VDD
GND
FS0:1
6
8
7
3
4, 5
Pin
Type
I
I
O
O
P
P
I
Pin Description
Reference Input: The output signals will be synchronized to this signal.
Feedback Input: This input must be fed by one of the outputs (OUT1 or OUT2) to
ensure proper functionality. If the trace between FBIN and the output pin being used
for feedback is equal in length to the traces between the outputs and the signal desti-
nations, then the signals received at the destinations will be synchronized to the REF
signal input (IN).
Output 1: The frequency of the signal provided by this pin is determined by the feed-
back signal connected to FBIN, and the FS0:1 inputs (see Table 1).
Output 2: The frequency of the signal provided by this pin is one-half of the frequency
of OUT1. See Table 1.
Power Connections: Connect to 3.3V or 5V. This pin should be bypassed with a
0.1-µF decoupling capacitor. Use ferrite beads to help reduce noise for optimal jitter
performance.
Ground Connection: Connect all grounds to the common system ground plane.
Function Select Inputs: Tie to VDD (HIGH, 1) or GND (LOW, 0) as desired per
Table 1.
Overview
Spread Aware
The W170-01 is a two-output zero delay buffer and frequency
multiplier. It provides an external feedback path allowing max-
imum flexibility when implementing the Zero Delay feature.
This is explained further in the sections of this data sheet titled
How to Implement Zero Delay,and Inserting Other Devices
in Feedback Path.
The W170-01 is a pin-compatible upgrade of the Cypress
W42C70-01. The W170-01 addresses some application de-
pendent problems experienced by users of the older device.
Most importantly, it addresses the tracking skew problem in-
duced by a reference which has Spread Spectrum Timing en-
abled on it.
Many systems being designed now utilize a technology called
Spread Spectrum Frequency Timing Generation. Cypress has
been one of the pioneers of SSFTG development, and we de-
signed this product so as not to filter off the Spread Spectrum
feature of the Reference input, assuming it exists. When a zero
delay buffer is not designed to pass the SS feature through,
the result is a significant amount of tracking skew which may
cause problems in systems requiring synchronization.
For more details on Spread Spectrum timing technology,
please see the Cypress application note titled, EMI Suppres-
sion Techniques with Spread Spectrum Frequency Timing
Generator (SSFTG) ICs.
2


Part Number W170
Description Spread Aware/ Frequency Multiplier and Zero Delay Buffer
Maker Cypress Semiconductor
Total Page 6 Pages
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