General Description
The DS1088L is a low-cost clock generator that pro-
duces 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
Copiers
Automotive Telematics
Computer Peripherals
POS Terminals
Cable Modems
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
Low-Cost Fixed-Frequency EconOscillatorTM
______________________________________________ Maxim Integrated Products
1
PDN
GND
GND
1
2
8
7
DNC
DNC
V
CC
V
CC
OUT
TOP VIEW
3
4
6
5
DS1088L
Pin Configuration
V
CC
OUT
PDN
DNC
GND
V
CC
V
CC
V
CC
DECOUPLING CAPACITORS
(0.1
F AND 0.01F)
DNC
GND
312kHz TO 133MHz
OUTPUT
DS1088L
Typical Operating Circuit
Ordering Information
Rev 1; 5/05
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.
EconOscillator is a trademark of Dallas Semiconductor.
PART
FREQUENCY (MHz)
TEMP RANGE
PIN-PACKAGE
DS1088LU-02
2.048
-20C to +85C
8 SOP
DS1088LU-10
10.0
-20C to +85C
8 SOP
DS1088LU-16
16.6
-20C to +85C
8 SOP
DS1088LU-66
66.6
-20C to +85C
8 SOP
DS1088LU-100
100.0
-20C to +85C
8 SOP
DS1088LU-yyy
*
-20C to +85C
8 SOP
yyy = frequency
*Email Custom_EconOscillators_Info@dalsemi.com for information/questions concerning custom frequencies.
DS1088L
Low-Cost Fixed-Frequency EconOscillatorTM
2
_____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -20C to +85C)
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.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
(Note 1)
2.7
3.6
V
High-Level Input Voltage (
PDN)
V
IH
0.7 x V
CC
V
CC
+ 0.3
V
Low-Level Input Voltage (
PDN)
V
IL
-0.3
0.3 x V
CC
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 3.6V, T
A
= -20C to +85C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
High-Level Output Voltage (OUT)
V
OH
I
OH
= -4mA, V
CC
= min
V
CC
- 0.4
V
Low-Level Output Voltage (OUT)
V
OL
I
OL
= 4mA
0.4
V
High-Level Input Current (
PDN)
I
IH
V
CC
= 3.6V
1
A
Low-Level Input Current (
PDN)
I
IL
V
IL
= 0
-1
A
Supply Current (Active)
I
CC
V
CC
= 3.6V, C
L
= 15pF, f
0
= 133MHz
15
24
mA
Standby Current (Power-Down)
I
CCQ
Power-down mode
10
A
Voltage Range on V
CC
Relative to Ground ..........-0.5V to +6.0V
Voltage Range on
PDN Relative
to Ground* ..............................................-0.5V to (V
CC
+ 0.5V)
Operating Temperature Range ...........................-20C to +85C
Storage Temperature Range ............................-55C to +125C
Soldering Temperature ....................See IPC/JEDEC J-STD-020
*Not to exceed +6.0V.
DS1088L
Low-Cost Fixed-Frequency EconOscillatorTM
_____________________________________________________________________
3
OSCILLATOR CHARACTERISTICS
(V
CC
= 2.7V to 3.6V, T
A
= -20C to +85C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Frequency Range
Available
f
0
0.3124
133.3
MHz
Output Frequency Tolerance
f
0
f
0
V
CC
= 3.3V, T
A
= +25
C (Note 8)
-0.3
+0.3
%
Voltage Frequency Variation
f
V
f
0
Over voltage range, T
A
= +25
C (Note 2)
-0.35
+0.35
%
-20
C to +25C
-0.7
+0.7
Temperature Frequency Variation
f
T
f
0
Over temperature range,
V
CC
= 3.3V (Notes 3, 4)
+25
C to +85C
-0.5
+0.5
%
Frequency Variation Over Voltage
and Temperature
f
V,T
f
0
Over voltage and temperature range
-1.0
+1.0
%
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 3.6V, T
A
= -20C to +85C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-Up Time
t
POR
+
t
STAB
(Note 5)
100
s
OUT Disabled After Entering
Power-Down Mode
t
PDN
(Note 6)
7
s
Load Capacitance
C
L
(Note 7)
15
50
pF
f
0
< 80MHz, f
0
80MHz
40
60
Output Duty Cycle (OUT)
f
0
< 80MHz
50
%
Note 1: All voltages are referenced to ground.
Note 2: This is the change in output frequency due to changes in voltage at T
A
= +25C.
Note 3: This is the change in output frequency due to changes in temperature from the +25C frequency at V
CC
= 3.3V.
Note 4: Guaranteed by design.
Note 5: This indicates the time elapsed between power-up and the output becoming active. An on-chip delay is intentionally intro-
duced to allow the oscillator to stabilize. t
STAB
is equivalent to approximately 512 clock cycles and will depend on the pro-
grammed 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) V
CC
biased +125C OP/L, 1000hr unbiased +150C bake, 1000 temperature cycles at -55C to +125C and
168hr +121C/2 ATM steam/unbiased autoclave.
DS1088L
Low-Cost Fixed-Frequency EconOscillatorTM
4
_____________________________________________________________________
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
DS1088L toc01
TEMPERATURE (
C)
SUPPLY CURRENT (mA)
55
30
5
4
5
6
7
8
9
10
3
-20
80
V
CC
= 3.3V
C
L
= 1.8pF
133MHz
100MHz
80MHz
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS1088L toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.3
3.1
2.9
4
5
6
7
8
9
10
3
2.7
3.5
T
A
= +25
C
C
L
= 1.8pF
133MHz
100MHz
80MHz
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS1088L toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
2.9
3.1
3.3
3.5
7
8
9
10
11
12
13
14
15
6
2.7
T
A
= +25
C
C
L
= 15pF
133MHz
100MHz
80MHz
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
DS1088L toc04
TEMPERATURE (
C)
SHUTDOWN CURRENT (
A)
80
55
30
5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
1.5
-20
PDN = 0V
V
CC
= 3.3V
FREQUENCY ERROR
vs. SUPPLY VOLTAGE
DS1088L toc05
SUPPLY VOLTAGE (V)
FREQUENCY ERROR (%)
2.9
3.1
3.3
3.5
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
-0.20
2.7
T
A
= +25
C
C
L
R
L
= 1.8pF
500
133MHz
100MHz
80MHz
FREQUENCY ERROR
vs. TEMPERATURE
DS1088L toc06
TEMPERATURE (
C)
FREQUENCY ERROR (%)
80
55
30
5
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
-0.4
-20
V
CC
= 3.3V
100MHz
133MHz
100MHz
80MHz
80MHz
T
A
= +25
C
C
L
R
L
= 1.8pF
500
DUTY CYCLE
vs. SUPPLY VOLTAGE
DS1088L toc07
SUPPLY VOLTAGE (V)
DUTY CYCLE (%)
3.1
2.9
3.3
50
51
52
53
54
55
56
49
2.7
3.5
133MHz
100MHz
80MHz
T
A
= +25
C
C
L
R
L
= 1.8pF
500
DUTY CYCLE
vs. TEMPERATURE
DS1088L toc08
TEMPERATURE (
C)
DUTY CYCLE (%)
80
55
5
30
49
50
51
52
54
53
55
56
48
-20
133MHz
100MHz
80MHz
V
CC
= 3.3V
T
A
= +25
C
C
L
R
L
= 1.8pF
500
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25C, unless otherwise noted.)
DS1088L
Low-Cost Fixed-Frequency EconOscillatorTM
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.
Detailed Description
The DS1088L is a low-cost clock generator that pro-
duces 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.
Output Frequency
The internal oscillator frequency is divided by the facto-
ry-programmed prescaler to produce an output fre-
quency of 312kHz to 133MHz. See the Standard
Frequency Options
table
for a list of standard frequen-
cies. Contact factory for custom frequencies.
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 sta-
ble and the voltage-controlled oscillator has generated
512 clock cycles.
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 ade-
quate high-frequency response for decoupling applica-
tions. These capacitors should be placed as close to
the V
CC
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.
Pin Description
PIN
NAME
FUNCTION
1
OUT
Oscillator Output
2
V
CC
Power Supply
3
V
CC
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
Figure 1. Block Diagram
V
CC
PDN
OUT
(312kHz
TO 133MHz)
EEPROM
CONTROL
VOLTAGE-
CONTROLLED
OSCILLATOR
80MHz TO 160MHz
PRESCALER
BY 1, 2, 4...256
GND
V
CC
DS1088L
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