http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf



Cypress Semiconductor Electronic Components Datasheet



W162

Spread Aware/ Zero Delay Buffer


No Preview Available !

W162 pdf
W162
Spread Aware™, Zero Delay Buffer
Features
• Spread Aware™—designed to work with SSFTG
reference signals
• Two banks of four outputs, plus the fed back output
• Outputs may be three-stated
• Available in 16-pin SOIC or SSOP package
• Extra strength output drive available (-19 version)
• Internal feedback
Key Specifications
Operating Voltage: ............................................... 3.3V±10%
Operating Range: .................................15 < fOUT < 133 MHz
Cycle-to-Cycle Jitter: .................................................. 250 ps
Output to Output Skew: .............................................. 150 ps
Propagation Delay: ..................................................... 150 ps
Block Diagram
Table 1. Input Logic
SEL1
0
0
SEL0
0
1
QA0:3
Three-
State
Active
1 0 Active
1 1 Active
QB0:3
Three-
State
Three-
State
Active
Active
PLL QFB
Shutdown Active
Active,
Utilized
Shutdown,
Bypassed
Active,
Utilized
Active
Active
Active
Pin Configuration
REF
PLL MUX
SEL0
SEL1
QFB
QA0
QA1
QA2
QA3
QB0
QB1
QB2
QB3
REF
QA0
QA1
VDD
GND
QB0
QB1
SEL1
1
2
3
4
5
6
7
8
16 QFB
15 QA3
14 QA2
13 VDD
12 GND
11 QB3
10 QB2
9 SEL0
Spread Aware is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 31, 2000, rev. *B



No Preview Available !

W162 pdf
W162
Pin Definitions
Pin Name
REF
QFB
QA0:3
QB0:3
VDD
GND
SEL0:1
Pin No.
1
16
2, 3, 14, 15
6, 7, 10, 11
4, 13
5, 12
9, 8
Pin
Type
I
O
O
O
P
P
I
Pin Description
Reference Input: The output signals QA0:3 through QB0:3 will be synchro-
nized to this signal unless the device is programmed to bypass the PLL.
Feedback Output: This signal is used as the feedback internally to establish
the propagation delay of nearly 0.
Outputs from Bank A: The frequency of the signals provided by these pins
is equal to the signal connected to REF.
Outputs from Bank B: The frequency of the signals provided by these pins
is equal to the signal connected to REF.
Power Connections: Connect to 3.3V. Use ferrite beads to help reduce noise
for optimal jitter performance.
Ground Connections: 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
The W162 products are nine-output zero delay buffers. A
Phase-Locked Loop (PLL) is used to take a time-varying signal
and provide eight copies of that same signal out.
Internal feedback is used to maximize the number of output
signals provided in the 16-pin package.
Spread Aware
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.
Functional Description
Logic inputs provide the user the ability to turn off one or both
banks of clocks when not in use, as described in Table 1. Dis-
abling a bank of unused outputs will reduce jitter and power
consumption, and will also reduce the amount of EMI generat-
ed by the W162.
These same inputs allow the user to bypass the PLL entirely if
so desired. When this is done, the device no longer acts as a
zero delay buffer, it simply reverts to a standard nine-output
clock driver.
2



Part Number W162
Description Spread Aware/ Zero Delay Buffer
Maker Cypress Semiconductor - Cypress Semiconductor
Total Page 6 Pages
PDF Download
W162 pdf
Download PDF File
W162 pdf
View for Mobile




Featured Datasheets

Part Number Description Manufacturers PDF
W1-07311APA-G0 TOUCH SCREEN W1-07311APA-G0
Power Systems GmbH
PDF
W10 1.5A WOM BRIDGE RECTIFIERS W10
Leshan Radio Company
PDF
W10 SINGLE-PHASE SILICON BRIDGE W10
GOOD-ARK Electronics
PDF
W10 1.5A SINGLE - PHASE SILICON BRIDGE W10
Semtech Corporation
PDF
W10 SINGLE PHASE SILICON BRIDGE RECTIFIER W10
Shanghai Sunrise Electronics
PDF
W10 SILICON BRIDGE RECTIFIERS W10
EIC discrete Semiconductors
PDF


Part Number Start With

0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

site map

webmaste! click here

contact us

Buy Components