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PDF DS1089L Data sheet ( Hoja de datos )
| Número de pieza | DS1089L | |
| Descripción | Center Spread`Spectrum EconOscillator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 1; 9/05
3.3V Center Spread-Spectrum EconOscillator™
General Description
The DS1089L is a clock generator that produces a
spread spectrum (dithered) square-wave output of fre-
quencies from 130kHz to 66.6MHz. The DS1089L is
shipped from the factory programmed at a specific fre-
quency. The DS1089L is pin-for-pin compatible with the
DS1087L, however, the DS1089L dithers at equal per-
centages above and below the center frequency. The
user still has access to the internal frequency divider,
selectable ±1%, ±2%, ±4%, or ±8% dithered output,
dithering rate, and programmable output power-
down/disable mode through an I2C™-compatible pro-
gramming interface. All the device settings are stored
in nonvolatile (NV) EEPROM allowing it to operate in
stand-alone applications. The DS1089L also has
power-down and output-enable control pins for power-
sensitive applications.
Applications
Automotive Infotainment
Printers
Copiers
www.DataSheet4U.com
Computer Peripherals
POS Terminals
Cable Modems
Features
♦ Factory-Programmed Square-Wave Generator
from 33.3MHz to 66.6MHz
♦ Center Frequency Remains Constant Independent
of Dither Percentage
♦ No External Timing Components Required
♦ EMI Reduction
♦ Variable Dither Frequency
♦ User Programmable Down to 130kHz with Divider
(Dependent on Master Oscillator Frequency)
♦ ±1%, ±2%, ±4%, or ±8% Selectable Dithered
Output
♦ Glitchless Output-Enable Control
♦ I2C-Compatible Serial Interface
♦ Nonvolatile Settings
♦ Power-Down Mode
♦ Programmable Output Power-Down/Disable Mode
Ordering Information
PART
TEMP RANGE
DS1089LU-yxx*
-40°C to +85°C
*See Standard Frequency Options Table.
PIN-PACKAGE
8 µSOP (118 mil)
Pin Configuration and Typical Operating Circuits appear at end of data sheet.
PART
FREQUENCY (MHz)
DS1089LU-21G
14.7456
DS1089LU-4CL
18.432
DS1089LU-22F
24.576
DS1089LU-23C
33.3
DS1089LU-450
50.0
DS1089LU-866
66.6
DS1089LU-yxx
Fixed up to 66.6
Add “/T” for Tape and Reel.
Custom frequencies available, contact factory.
Standard Frequency Options
SPREAD (±%)
1
2
1
1
2
4
1, 2, 4, or 8
DITHER FREQUENCY
fMOSC / 4096
fMOSC / 4096
fMOSC / 2048
fMOSC / 4096
fMOSC / 4096
fMOSC / 4096
fMOSC / 2048 or 4096 or 8192
EconOscillator is a trademark of Dallas Semiconductor Corp.
I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided
that the system conforms to the I2C Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
3.3V Center Spread-Spectrum EconOscillator™
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
10
TA = +25°C,
OUTPUT
8 UNLOADED
66MHz
6
4
2 33MHz
50MHz 130kHz
0
2.7
3.0 3.3
SUPPLY VOLTAGE (V)
3.6
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
10
9
TA = +25°C,
OUTPUT
8 UNLOADED
66MHz
7
6
5
4
3 33MHz
2
50MHz 130kHz
1
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
SUPPLY CURRENT
vs. PRESCALER
10
TA = +25°C,
fMOSC = 50MHz,
8 OUTPUT UNLOADED
6
4
2
0
1
3.6V
3.3V
2.7V
10 100
PRESCALE DIVIDER (DECIMAL)
1000
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
5
VCC = 3.3V,
PDN = GND
4
3
2
1
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
FREQUENCY % CHANGE
vs. SUPPLY VOLTAGE
0.50
TA = +25°C
33MHz
0.25
66MHz
0 130kHz
-0.25
50MHz
-0.50
2.7
3.0 3.3
SUPPLY VOLTAGE (V)
3.6
FREQUENCY % CHANGE
vs. TEMPERATURE
0.2
VCC = 3.3V
0
130kHz
-0.2
-0.4
-0.6
-0.8
-40
50MHz
66MHz
33MHz
-15 10 35 60
TEMPERATURE (°C)
85
_____________________________________________________________________ 5
5 Page 
3.3V Center Spread-Spectrum EconOscillator™
SDA
tBUF
SCL
STOP
START
tLOW
tHD:STA
Figure 5. I2C AC Characteristics
tR tF
tHD:STA
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
REPEATED
START
tSP
tSU:STO
TYPICAL I2C WRITE TRANSACTION
MSB
LSB MSB
LSB MSB
LSB
START
1
0
1
1
A2*
A1*
A0* R/W
SLAVE
ACK
b7
b6 b5
b4 b3
b2
b1
b0
SLAVE
ACK
b7
b6 b5
b4 b3
b2
b1
b0
SLAVE
ACK
STOP
DEVICE IDENTIFIER
DEVICE READ/
ADDRESS WRITE
COMMAND/REGISTER ADDRESS
DATA
EXAMPLE I2C TRANSACTIONS (WHEN A0, A1, AND A2 ARE ZERO)
B0h
A) SINGLE BYTE WRITE
-WRITE PRESCALER
START 1 0 1 1 0 0 0 0
SLAVE
ACK
REGISTER TO 128
02h
00000010
SLAVE
ACK
DATA
10000000
SLAVE
ACK
STOP
B) SINGLE BYTE READ
-READ PRESCALER
REGISTER
B0h 02h
B1h DATA
START 1 0 1 1 0 0 0 0
SLAVE
ACK
00000010
SLAVE
ACK
REPEATED
START
10110001
SLAVE
ACK
10000000
MASTER
NACK
STOP
*THE ADDRESS DETERMINED BY A0, A1, AND A2 MUST
MATCH THE ADDRESS SET IN THE ADDR REGISTER.
Figure 6. I2C Transactions
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1089L,
decouple the power supply with 0.01µF and 0.1µF
high-quality, ceramic, surface-mount capacitors.
Surface-mount components minimize lead inductance,
which improves performance, and ceramic capacitors
tend to have adequate high-frequency response for
decoupling applications. These capacitors should be
placed as close to the VCC and GND pins as possible.
Stand-Alone Mode
SCL and SDA cannot be left floating even in stand-
alone mode. If the DS1089L will never need to be pro-
grammed in-circuit, including during production
testing, SDA and SCL can be connected high.
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS1089L.PDF ] | |
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