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Rev 1; 5/05
Low-Cost Fixed-Frequency EconOscillatorTM
General Description
The DS1088L is a low-cost clock generator that produces a square-wave output without external timing components. The fixed-frequency oscillator is available in factory-calibrated frequencies from 312kHz to 133MHz. The DS1088L has a power-down pin for power-sensitive applications.
Features
Factory-Programmed, Square-Wave Generator from 312kHz to 133MHz Single Output No External Timing Components Required 2.7V to 3.6V Supply Power-Down Mode 1.0% Frequency Tolerance Over Temperature and Voltage Wide Temperature Range (-20C to +85C)
DS1088L
Applications
Printers Copiers Automotive Telematics Computer Peripherals POS Terminals Cable Modems
Ordering Information
PART DS1088LU-02 DS1088LU-10 DS1088LU-16 DS1088LU-66 DS1088LU-100 DS1088LU-YYY FREQUENCY (MHz) 2.048 10.0 16.6 66.6 100.0 * TEMP RANGE -20C to +85C -20C to +85C -20C to +85C -20C to +85C -20C to +85C -20C to +85C PIN-PACKAGE 8 SOP 8 SOP 8 SOP 8 SOP 8 SOP 8 SOP
yyy = frequency *Email Custom_EconOscillators_Info@dalsemi.com for information/questions concerning custom frequencies.
Typical Operating Circuit
TOP VIEW
312kHz TO 133MHz OUTPUT OUT DNC
Pin Configuration
DS1088L
VCC VCC VCC GND DECOUPLING CAPACITORS (0.1F AND 0.01F) DNC PDN GND VCC
OUT 1 VCC VCC 2 3
8 7
DNC DNC PDN GND
DS1088L
6 5
GND 4
EconOscillator is a trademark of Dallas Semiconductor. ______________________________________________ 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.
Low-Cost Fixed-Frequency EconOscillatorTM DS1088L
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to Ground ..........-0.5V to +6.0V Voltage Range on PDN Relative to Ground* ..............................................-0.5V to (VCC + 0.5V) *Not to exceed +6.0V.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Operating Temperature Range ...........................-20C to +85C Storage Temperature Range ............................-55C to +125C Soldering Temperature ....................See IPC/JEDEC J-STD-020
RECOMMENDED OPERATING CONDITIONS
(TA = -20C to +85C)
PARAMETER Supply Voltage High-Level Input Voltage (PDN) Low-Level Input Voltage (PDN) SYMBOL VCC VIH VIL (Note 1) CONDITIONS MIN 2.7 0.7 x VCC -0.3 TYP MAX 3.6 VCC + 0.3 0.3 x VCC UNITS V V V
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 3.6V, TA = -20C to +85C.)
PARAMETER High-Level Output Voltage (OUT) Low-Level Output Voltage (OUT) High-Level Input Current (PDN) Low-Level Input Current (PDN) Supply Current (Active) Standby Current (Power-Down) SYMBOL VOH VOL IIH IIL ICC ICCQ IOL = 4mA VCC = 3.6V VIL = 0 VCC = 3.6V, CL = 15pF, f0 = 133MHz Power-down mode -1 15 24 10 CONDITIONS IOH = -4mA, VCC = min MIN VCC - 0.4 0.4 1 TYP MAX UNITS V V A A mA A
2
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Low-Cost Fixed-Frequency EconOscillatorTM
OSCILLATOR CHARACTERISTICS
(VCC = 2.7V to 3.6V, TA = -20C to +85C.)
PARAMETER Output Frequency Range Available Output Frequency Tolerance Voltage Frequency Variation Temperature Frequency Variation Frequency Variation Over Voltage and Temperature SYMBOL f0 f0 f0 fV f0 fT f0 fV,T f0 VCC = 3.3V, TA = +25C (Note 8) Over voltage range, TA = +25C (Note 2) Over temperature range, VCC = 3.3V (Notes 3, 4) -20C to +25C +25C to +85C CONDITIONS MIN 0.3124 -0.3 -0.35 -0.7 -0.5 -1.0 TYP MAX 133.3 +0.3 +0.35 +0.7 +0.5 +1.0 UNITS MHz % % % %
DS1088L
Over voltage and temperature range
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 3.6V, TA = -20C to +85C.)
PARAMETER Power-Up Time OUT Disabled After Entering Power-Down Mode Load Capacitance Output Duty Cycle (OUT) SYMBOL tPOR + tSTAB tPDN CL (Note 5) (Note 6) (Note 7) f0 < 80MHz, f0 80MHz f0 < 80MHz 40 50 15 CONDITIONS MIN TYP MAX 100 7 50 60 UNITS s s pF %
Note 1: Note 2: Note 3: Note 4: Note 5:
All voltages are referenced to ground. This is the change in output frequency due to changes in voltage at TA = +25C. This is the change in output frequency due to changes in temperature from the +25C frequency at VCC = 3.3V. Guaranteed by design. This indicates the time elapsed between power-up and the output becoming active. An on-chip delay is intentionally introduced to allow the oscillator to stabilize. tSTAB is equivalent to approximately 512 clock cycles and will depend on the programmed oscillator frequency. Note 6: Output disabled in 2 cycles or less of the output frequency. Note 7: Output voltage swings may be impaired at high frequencies combined with high-output loading. Note 8: Typical frequency shift due to aging is within 0.2%. Aging stressing includes level 1 moisture reflow preconditioning (24hr +125C bake, 168hr +85C/85%RH moisture soak, and three solder reflow passes +240C +0C/-5C peak) followed by 1000hr (max) VCC biased +125C OP/L, 1000hr unbiased +150C bake, 1000 temperature cycles at -55C to +125C and 168hr +121C/2 ATM steam/unbiased autoclave.
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3
Low-Cost Fixed-Frequency EconOscillatorTM DS1088L
Typical Operating Characteristics
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT vs. TEMPERATURE
DS1088L toc01
ACTIVE SUPPLY CURRENT vs. SUPPLY VOLTAGE
DS1088L toc02
ACTIVE SUPPLY CURRENT vs. SUPPLY VOLTAGE
14 SUPPLY CURRENT (mA) 13 12 11 133MHz 10 9 8 100MHz TA = +25C CL = 15pF
DS1088L toc03
10 VCC = 3.3V 9 SUPPLY CURRENT (mA) 8 7 6 100MHz 5 4 3 -20 5 30 55 80 TEMPERATURE (C) 80MHz 133MHz CL = 1.8pF
10 TA = +25C 9 SUPPLY CURRENT (mA) 8 7 133MHz 6 5 4 80MHz 3 2.7 2.9 3.1 3.3 3.5 SUPPLY VOLTAGE (V) 100MHz CL = 1.8pF
15
7 6 2.7 2.9 3.1
80MHz 3.3 3.5
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
DS1088L toc04
FREQUENCY ERROR vs. SUPPLY VOLTAGE
DS1088L toc05
FREQUENCY ERROR vs. TEMPERATURE
VCC = 3.3V 0.2 FREQUENCY ERROR (%) 0.1 0 -0.1 -0.2 -0.3 -0.4 -20 5 30 55 80 TEMPERATURE (C) 100MHz 80MHz TA = +25C CL RL = 1.8pF 500 133MHz 80MHz 100MHz
DS1088L toc06 DS1088L toc08
2.5 2.4 SHUTDOWN CURRENT (A) 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 -20 5 30 55 80 TEMPERATURE (C) VCC = 3.3V PDN = 0V
0.20 0.15 FREQUENCY ERROR (%) 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 2.7 2.9 3.1 3.3 3.5 SUPPLY VOLTAGE (V) 80MHz TA = +25C CL RL = 1.8pF 500 133MHz 100MHz
0.3
DUTY CYCLE vs. SUPPLY VOLTAGE
133MHz 55 DUTY CYCLE (%) 54 53 52 51 80MHz 50 49 2.7 2.9 3.1 3.3 3.5 SUPPLY VOLTAGE (V) TA = +25C CL RL = 1.8pF 500 100MHz
DS1088L toc07
DUTY CYCLE vs. TEMPERATURE
56 55 54 DUTY CYCLE (%) 53 52 51 50 49 48 -20 TA = +25C CL RL = 1.8pF 500 5 30 55 80 80MHz 100MHz 133MHz VCC = 3.3V
56
TEMPERATURE (C)
4
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Low-Cost Fixed-Frequency EconOscillatorTM
Pin Description
PIN 1 2 3 4 5 NAME OUT VCC VCC GND GND Power Supply Power Supply Ground Ground Power-Down. When the pin is high, the oscillator is enabled. When the pin is low, the oscillator is disabled (power-down mode). Do Not Connect. The DNC pins are internally connected to ground. Do Not Connect FUNCTION Oscillator Output
Power-Down Mode
The PDN pin disables the internal oscillator and the oscillator output for power-sensitive applications. The power-down pin must remain low for at least two output frequency cycles plus 10s for deglitching purposes. On power-up, the output is disabled until power is stable and the voltage-controlled oscillator has generated 512 clock cycles.
DS1088L
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1088L, the power supply must be decoupled with 0.01F and 0.1F high-quality, ceramic, surface-mount capacitors. Surface-mount components minimize lead inductance, which improves performance, and 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.
6
PDN
7 8
DNC DNC
Detailed Description
The DS1088L is a low-cost clock generator that produces a square-wave output without external timing components. The fixed-frequency oscillator is available in factory-calibrated frequencies from 312kHz to 133MHz. The DS1088L has a power-down pin for power-sensitive applications. A block diagram of the DS1088L is shown in Figure 1.
Chip Topology
TRANSISTOR COUNT: 4507 SUBSTRATE CONNECTED TO GROUND.
Package Information
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.
Output Frequency
The internal oscillator frequency is divided by the factory-programmed prescaler to produce an output frequency of 312kHz to 133MHz. See the Standard Frequency Options table for a list of standard frequencies. Contact factory for custom frequencies.
VCC VCC EEPROM CONTROL PDN GND VOLTAGECONTROLLED OSCILLATOR 80MHz TO 160MHz PRESCALER BY 1, 2, 4...256 OUT (312kHz TO 133MHz)
DS1088L
Figure 1. Block Diagram
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.

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