Dallas DS1088L Low-cost fixed-frequency econoscillator Datasheet

Rev 1; 5/05
Low-Cost Fixed-Frequency EconOscillator™
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.
Applications
Printers
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
Copiers
♦ 1.0% Frequency Tolerance Over Temperature
and Voltage
Automotive Telematics
♦ Wide Temperature Range (-20°C to +85°C)
Computer Peripherals
POS Terminals
Cable Modems
Ordering Information
FREQUENCY (MHz)
TEMP RANGE
PIN-PACKAGE
DS1088LU-02
2.048
-20°C to +85°C
8 µSOP
DS1088LU-10
10.0
-20°C to +85°C
8 µSOP
DS1088LU-16
16.6
-20°C to +85°C
8 µSOP
DS1088LU-66
66.6
-20°C to +85°C
8 µSOP
DS1088LU-100
100.0
-20°C to +85°C
8 µSOP
DS1088LU-yyy
*
-20°C to +85°C
8 µSOP
PART
yyy = frequency
*Email [email protected] for information/questions concerning custom frequencies.
Pin Configuration
Typical Operating Circuit
TOP VIEW
312kHz TO 133MHz
OUTPUT
OUT
DNC
DS1088L
VCC
VCC
DNC
VCC
PDN
GND
GND
VCC
OUT 1
8
DNC
VCC
2
7
DNC
VCC
3
6
PDN
5
GND
GND 4
DS1088L
DECOUPLING CAPACITORS
(0.1µF AND 0.01µF)
EconOscillator is a trademark of Dallas Semiconductor.
______________________________________________ Maxim Integrated Products
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
DS1088L
General Description
DS1088L
Low-Cost Fixed-Frequency EconOscillator™
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)
Operating Temperature Range ...........................-20°C to +85°C
Storage Temperature Range ............................-55°C to +125°C
Soldering Temperature ....................See IPC/JEDEC J-STD-020
*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.
RECOMMENDED OPERATING CONDITIONS
(TA = -20°C to +85°C)
PARAMETER
SYMBOL
Supply Voltage
VCC
High-Level Input Voltage (PDN)
VIH
Low-Level Input Voltage (PDN)
VIL
CONDITIONS
(Note 1)
MIN
TYP
2.7
MAX
3.6
0.7 x VCC
-0.3
UNITS
V
VCC + 0.3
V
0.3 x VCC
V
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 3.6V, TA = -20°C to +85°C.)
PARAMETER
SYMBOL
High-Level Output Voltage (OUT)
VOH
IOH = -4mA, VCC = min
Low-Level Output Voltage (OUT)
VOL
IOL = 4mA
0.4
V
High-Level Input Current (PDN)
IIH
VCC = 3.6V
1
µA
Low-Level Input Current (PDN)
IIL
VIL = 0
ICC
VCC = 3.6V, CL = 15pF, f0 = 133MHz
Supply Current (Active)
Standby Current (Power-Down)
2
ICCQ
CONDITIONS
Power-down mode
_____________________________________________________________________
MIN
TYP
MAX
VCC - 0.4
UNITS
V
-1
µA
15
24
mA
10
µA
Low-Cost Fixed-Frequency EconOscillator™
(VCC = 2.7V to 3.6V, TA = -20°C to +85°C.)
PARAMETER
Output Frequency Range
Available
SYMBOL
CONDITIONS
f0
MIN
TYP
MAX
UNITS
0.3124
133.3
MHz
Output Frequency Tolerance
∆f0
f0
VCC = 3.3V, TA = +25°C (Note 8)
-0.3
+0.3
%
Voltage Frequency Variation
∆fV
f0
Over voltage range, TA = +25°C (Note 2)
-0.35
+0.35
%
Temperature Frequency Variation
∆fT
f0
Over temperature range,
VCC = 3.3V (Notes 3, 4)
-20°C to +25°C
-0.7
+0.7
+25°C to +85°C
-0.5
+0.5
Frequency Variation Over Voltage
and Temperature
∆fV,T
f0
-1.0
+1.0
%
MAX
UNITS
Over voltage and temperature range
%
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 3.6V, TA = -20°C to +85°C.)
PARAMETER
Power-Up Time
OUT Disabled After Entering
Power-Down Mode
Load Capacitance
Output Duty Cycle (OUT)
SYMBOL
CONDITIONS
MIN
TYP
tPOR +
tSTAB
(Note 5)
100
µs
tPDN
(Note 6)
7
µs
CL
(Note 7)
50
pF
f0 < 80MHz, f0 ≥ 80MHz
f0 < 80MHz
15
40
60
50
%
All voltages are referenced to ground.
This is the change in output frequency due to changes in voltage at TA = +25°C.
This is the change in output frequency due to changes in temperature from the +25°C 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
+125°C bake, 168hr +85°C/85%RH moisture soak, and three solder reflow passes +240°C +0°C/-5°C peak) followed by
1000hr (max) VCC biased +125°C OP/L, 1000hr unbiased +150°C bake, 1000 temperature cycles at -55°C to +125°C and
168hr +121°C/2 ATM steam/unbiased autoclave.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
_____________________________________________________________________
3
DS1088L
OSCILLATOR CHARACTERISTICS
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
9
8
7
CL = 1.8pF
TA = +25°C
SUPPLY CURRENT (mA)
9
133MHz
6
100MHz
5
15
8
7
133MHz
6
100MHz
5
13
12
11
133MHz
10
9
100MHz
8
4
4
80MHz
7
80MHz
3
3
-20
5
30
2.9
3.1
3.3
3.5
2.7
2.9
3.3
3.1
3.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
FREQUENCY ERROR
vs. SUPPLY VOLTAGE
FREQUENCY ERROR
vs. TEMPERATURE
2.1
2.0
1.9
1.8
100MHz
VCC = 3.3V
0.2
0.10
0.05
133MHz
0
-0.05
80MHz
-0.10
100MHz
0.1
133MHz
0
80MHz
-0.1
100MHz
-0.2
80MHz
1.7
-0.15
1.6
TA = +25°C
CL RL = 1.8pF 500Ω
-0.3
-0.20
1.5
-20
5
55
30
2.7
80
2.9
3.1
3.3
-0.4
3.5
-20
55
30
5
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
DUTY CYCLE
vs. TEMPERATURE
DUTY CYCLE
vs. SUPPLY VOLTAGE
56
DS1088L toc07
56
133MHz
55
VCC = 3.3V
133MHz
55
54
54
53
DUTY CYCLE (%)
DUTY CYCLE (%)
TA = +25°C
CL RL = 1.8pF 500Ω
DS1088L toc08
2.2
0.3
FREQUENCY ERROR (%)
FREQUENCY ERROR (%)
2.3
0.15
100MHz
52
51
TA = +25°C
CL RL = 1.8pF 500Ω
49
2.7
2.9
53
52
100MHz
51
50
80MHz
50
3.1
3.3
DS1088L toc06
0.20
DS1088L toc04
PDN = 0V
VCC = 3.3V
2.4
2.7
80
55
80MHz
6
TEMPERATURE (°C)
2.5
3.5
80MHz
49
TA = +25°C
CL RL = 1.8pF 500Ω
48
-20
SUPPLY VOLTAGE (V)
4
CL = 15pF
TA = +25°C
14
DS1088L toc05
SUPPLY CURRENT (mA)
10
DS1088L toc03
CL = 1.8pF
SUPPLY CURRENT (mA)
VCC = 3.3V
DS1088L toc01
10
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS1088L toc02
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN CURRENT (µA)
DS1088L
Low-Cost Fixed-Frequency EconOscillator™
_____________________________________________________________________
5
30
55
TEMPERATURE (°C)
80
80
Low-Cost Fixed-Frequency EconOscillator™
PIN
NAME
FUNCTION
1
OUT
Oscillator Output
2
VCC
Power Supply
3
VCC
Power Supply
4
GND
Ground
5
GND
Ground
6
PDN
Power-Down. When the pin is high, the
oscillator is enabled. When the pin is
low, the oscillator is disabled
(power-down mode).
7
DNC
Do Not Connect. The DNC pins are
internally connected to ground.
8
DNC
Do Not Connect
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 10µs for deglitching purposes.
On power-up, the output is disabled until power is stable and the voltage-controlled oscillator has generated
512 clock cycles.
Applications Information
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.
Power-Supply Decoupling
To achieve the best results when using the DS1088L,
the power supply must be decoupled with 0.01µF and
0.1µF 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.
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
VOLTAGECONTROLLED
OSCILLATOR
80MHz TO 160MHz
PRESCALER
BY 1, 2, 4...256
OUT
(312kHz
TO 133MHz)
GND
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
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.
DS1088L
Pin Description
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