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W48C20 PDF даташит

Спецификация W48C20 изготовлена ​​​​«Cypress Semiconductor» и имеет функцию, называемую «Audio Subsystem Clock Generator».

Детали детали

Номер произв W48C20
Описание Audio Subsystem Clock Generator
Производители Cypress Semiconductor
логотип Cypress Semiconductor логотип 

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W48C20 Даташит, Описание, Даташиты
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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. **









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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









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W48C20
Absolute Maximum Ratings
Stresses greater than those listed in this table may cause per-
manent damage to the device. These represent a stress rating
only. Operation of the device at these or any other conditions
above those specified in the operating sections of this specifi-
cation is not implied. Maximum conditions for extended peri-
ods may affect reliability
Parameter
VCC, VIN
TSTG
TA
TB
TSOLD
Description
Voltage on any Pin with Respect to GND
Storage Temperature
Operating Temperature
Ambient Temperature under Bias
Soldering Temperature, Max. 20 seconds
Rating
0.5 to +7.0
65 to +150
0 to +70
55 to +125
260
Unit
V
°C
°C
°C
°C
Electrical Characteristics at 5.0V
DC Electrical Characteristics: TA = 0°C to +70°C; VCC = 5V ± 10%
Parameter
Description
Conditions
VDD Operating Voltage
VIH Input High Voltage
VIL Input Low Voltage
VOH Output High Voltage
VOL Output Low Voltage
IDD Operating Supply Current
Input Capacitance[1]
IOH = 25 mA
IOL = 25 mA
No Load
Actual Mean Frequency versus Target
Min
Typ
Max
Unit
4.5 5.5 V
3.5 2.5
V
2.5 1.5
V
2.4 V
0.4 V
18 mA
7 pF
±0.2 %
AC Characteristics: TA = 0°C to +70°C; VCC = 5V ± 10%
Parameter
Test Condition/Comments
Min
Input Clock Frequency
Input Clock Duty Cycle, 14.318 MHz
Time above 2.5V
20
Output Clock Rise Time
0.8V to 2.0V
Output Clock Fall Time
2.0V to 0.8V
Output Clock Duty Cycle, 24.576 MHz
Time above 1.5V
40
Output Clock Duty Cycle, 16.9344 MHz Time above 1.5V
45
Output Clock Duty Cycle, 33.868 MHz
Output Clock Duty Cycle, 14.318 MHz[2]
Time above 1.5V
Time above 1.5V
45
45
Absolute Clock Period Jitter, except 14.3 Pins 4, 5, 6 only
400
One Sigma Clock Period Jitter, except 14.3 Pins 4, 5, 6 only
Notes:
1. If crystal is used as input Crystal Load Capacitance (CL) = 12 pF.
2. If a clock is used as input, the duty cycle of the 14.318-MHz output will be the same as the input clock.
Typ
14.31818
45
50
50
50
200
60
Max
80
1.5
1.5
60
55
55
55
400
Unit
MHz
%
ns
ns
%
%
%
%
ps
ps
Ordering Information
Ordering Code
W48C20
Freq. Mask
Code
01A
08
09
Document #: 38-00879
Package
Name
G
Package Type
8-pin SOIC (150-mil)
3










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Номер в каталогеОписаниеПроизводители
W48C20Audio Subsystem Clock GeneratorCypress Semiconductor
Cypress Semiconductor

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