900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Cypress Semiconductor Electronic Components Datasheet

W48C20 Datasheet

Audio Subsystem Clock Generator

No Preview Available !

www.DataSheet4U.com
W48C20
Audio Subsystem Clock Generator
Features
• Two independent phase-locked loops
• Four independent output frequencies
• ±250 ps maximum cycle-to-cycle jitter
• 3 ns rise/fall time (20%-80% VDD).
• Options available for a wide range of applications
• Supports 3.3V and 5V operation
• Low power CMOS design available in:
— 8-pin SOIC (Small Outline Integrated Circuit)
Overview
The W48C20 is a general-purpose device that features two
phase-locked loops. Through the use of metal masks, the chip
can be tailored to a wide variety of applications.
The W48C20 has four clock outputs, each of which is
maskable to a different frequency. Because the chip offers four
outputs in eight pins, it is suited to applications that require
multiple frequencies and have space constraints.
Table 1. Product Selection Guide
Mask Pin 4 Pin 5 Pin 6 Pin 7 Application
-01A 16.9344 24.576 33.8688 14.318 Audio/Crystal
-08 33.8688 18.432 16.9344 27.00 DVD
-09 40.00 22.50 20.00 25.00 Hard Disk
Drives
Functional Block Diagram
XTAL
X1
X2
Crystal load capacitors
as needed
VCC
XTAL
OSC
PLL 1
GND
PLL 2
OUTPUT
OUTPUT
OUTPUT
OUTPUT
Pin Configuration
X1 1 8 X2
VCC 2 7 OUTPUT
GND 3 6 OUTPUT
OUTPUT 4 5 OUTPUT
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
December 20, 1999, rev. **


Cypress Semiconductor Electronic Components Datasheet

W48C20 Datasheet

Audio Subsystem Clock Generator

No Preview Available !

www.DataSheet4U.com
W48C20
Pin Definitions
Pin Name Pin No.
X1 1
VDD
2
GND
3
OUTPUT
4
OUTPUT
5
OUTPUT
6
OUTPUT
7
X2 8
Pin Type
I
P
P
O
O
O
O
I
Pin Description
Crystal connection or external clock frequency input (14.318 MHz).
Power supply connection.
Ground connection.
16.9344-MHZ clock output for stereo codec.
24.576-MHz clock output for stereo codec.
33.868-MHz clock output for OPL4.
14.318-MHz clock buffered output for OPL3 or PCMCIA controller.
Crystal connection. Leave this pin unconnected when using an external clock.
External Components/Crystal Selection
The W48C20 incorporates a crystal oscillator circuit designed
to provide 50% duty cycle over a range of operating conditions,
including the addition of external crystal load capacitors to pins
X1 and X2. A parallel resonant 14.318-MHz, 12-pF load crystal
is recommended. A series-resonant crystal or a parallel reso-
nant crystal specifying a different load can be used, but either
will result in frequencies which are slightly different from the
ideal (up to 0.06%).
The crystal load capacitance can be increased by adding a
capacitor to each of the X1 and X2 pins and ground. This en-
ables the use of a crystal specifying a load greater than 12 pF
without changing the output frequency.
Duty cycle is also maintained when using an external clock
source (connected to X1, X2 left unconnected) as long as the
external clock has good duty cycle. The circuit exhibits about
50% less clock jitter from the 14.318-MHz output when com-
pared to similar devices.
14.318 MHz IN
Pin 1 8
33(optional)
2.2 µF
(optional)
V
0.1 µF
G
27
36
45
14.3 MHz OUT
33.9 MHz OUT
33(optional)
33(optional)
33(optional)
16.9 MHz OUT 24.6 MHz OUT
Figure 1. Suggested Layout
2


Part Number W48C20
Description Audio Subsystem Clock Generator
Maker Cypress Semiconductor
PDF Download

W48C20 Datasheet PDF





Similar Datasheet

1 W48C20 Audio Subsystem Clock Generator
Cypress Semiconductor





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

Privacy Policy