General Description
The DS1099 is a low-cost, low-power, low-frequency
silicon oscillator that generates two square-wave out-
puts with frequencies between 0.25Hz and 1.048MHz.
Individual output enables allow both outputs to be
enabled/disabled independently. Both outputs are
capable of sinking 16mA, allowing them to directly
interface to light-emitting diodes (LEDs) as well as other
external circuitry. The DS1099 operates over a wide
supply voltage, making it suitable for both 3V and 5V
systems. The device is shipped from the factory custom
programmed and calibrated, ready to be inserted into
the end application.
Contact the factory for custom frequencies or require-
ments.
Applications
Flashing LED Status Indicators
Consumer Appliances
Automotive
Servers
Printers
Switch-Mode Power Supplies
Features
♦Low-Cost, Low-Frequency EconOscillator™ with
Dual Outputs
♦Factory Programmed
♦Output Frequencies Independently Programmable
from 0.25Hz to 1.048MHz
♦2.7V to 5.5V Single-Supply Operation
♦No External Timing Components Required
♦Independent Output Enables
♦CMOS/TTL-Compatible Outputs
♦Oscillator Outputs Capable of Sinking 16mA to
Directly Drive LEDs
♦Relieves Microprocessor of Periodic Interrupt
♦Low-Power Consumption
♦Operating Temperature Range: -40°C to +85°C
♦±100ppm/°C Temp Drift (MAX)
DS1099
Low-Frequency Dual EconOscillator
______________________________________________ Maxim Integrated Products 1
OE1
OEOGND
1
2
8
7
N.C.
N.C.OUT0
VCC
OUT1
μSOP
TOP VIEW
3
4
6
5
DS1099
Pin Configuration
Ordering Information
DS1099 OUT0
OUT1
GND
OE0
VCC
VCC
VCC
OE1
N.C.
N.C.
OE1 CAN INSTEAD
BE TIED TO VCC
IF OUT1 IS NOT USED.
OUTPUTS CAPABLE OF
SINKING 16mA
Typical Operating Circuit
Rev 0; 2/04
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.
PART TEMP RANGE
PIN-PACKAGE
DS1099U- α O α 1 -40°C to +85°C 8 µSOP
EconOscillator is a trademark of Dallas Semiconductor.
Ordering information is continued on the last page.
*Where α0and α1specify the factory programmed divider set-
tings for OUT0 and OUT1, respectively.
DS1099
Low-Frequency Dual EconOscillator
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATING CONDITIONS
(TA= -40°C to +85°C)
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.
Voltage Range on VCC Relative to Ground ...........-0.5V to +6.0V
Voltage Range on OE0 and OE1
Relative to Ground.................................-0.5V to (VCC + 0.5V),
not to exceed 6.0V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Supply Voltage VCC (Note 1) 2.7 5.5 V
Input Logic 1 (OE0, OE1)V
IH 0.7 x
VCC
VCC +
0.3 V
Input Logic 0 (OE0, OE1)V
IL
-0.3
+0.3 x
VCC
V
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Standby Supply Current ISTBY OE0 = OE1 = VCC
145
275 µA
Active Supply Current (Note 2) ICC
CL = 15pF per output,
OE0 = OE1 = GND,
VCC = 5.0V
122.07Hz and
250kHz 240 µA
High-Level Output Voltage
(OUT0, OUT1) VOH IOH = -1mA, VCC = MIN 2.4 V
Low-Level Output Voltage
(OUT0, OUT1) VOL IOL = 16mA 0.4 V
High-Level Input Current
(OE0, OE1)IIH VIH = VCC
+1.0
µA
Low-Level Input Current
(OE0, OE1)IIL VIL = 0.0V
-1.0
µA
DS1099
Low-Frequency Dual EconOscillator
_____________________________________________________________________ 3
Note 1: All voltages referenced to ground.
Note 2: Active supply current combines the standby current with the output current. The output current is defined by
I = (CLOAD + 12pF ) x VCC x fOUT for each output when enabled.
Note 3: This is the change observed in output frequency due to changes in temperature or voltage.
Note 4: This parameter is guaranteed by design.
Note 5: This indicates the time between power-up and the outputs becoming active.
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Master Oscillator Frequency fMOSC 1.0
MHz
Nominal Output Frequency fOUT0,
fOUT1
0.25 1,048,000
Hz
Output Frequency Tolerance ΔfOUT TA = +25°C, VCC = 5.0V
-1.0 +1.0
%
TA = +25°C
3300
ppm/V
Voltage Frequency Variation
(Note 3) ΔfOUT 2.7V to 5.5V, TA = +25°C
-2.0 +2.5
%
Temperature Frequency Variation
ΔfOUT (Notes 3, 4)
-100 +100
ppm/°C
Output Duty Cycle 45 55 %
Power-Up Time tPU (Note 5) 10 ms
Output Rise/Fall Time tR, tFCL = 15pF (both) 20 ns
Typical Operating Characteristics
(VCC = +5.0V, TA = +25°C, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 OUT1
2 OUT0 Oscillator Outputs. Each output is forced high when the corresponding OE is high.
3V
CC Positive Supply Terminal
4 GND Ground
5OE0
6OE1
Output Enable for OUT0 and OUT1, respectively. When low, the outputs are enabled. When high, the
corresponding output is disabled (forced high).
7, 8 N.C. No Connection
DS1099
Low-Frequency Dual EconOscillator
4 _____________________________________________________________________
Typical Operating Characteristics (continued)
(VCC = +5.0V, TA = +25°C, unless otherwise noted.)
DS1099
Low-Frequency Dual EconOscillator
_____________________________________________________________________ 5
Detailed Description
The DS1099 consists of a fixed-frequency 1.048MHz
master oscillator followed by two independent factory-
programmable dividers. The two divider outputs are
connected to pins OUT0 and OUT1, which are inde-
pendently enabled/disabled using the output-enable
pins, OE0 and OE1, respectively. When the output-
enable pins are active (low), the corresponding outputs
are enabled. If either output-enable pin is tied to its
inactive state (high), then the corresponding output is
disabled and forced high immediately. The output-
enable pins only disable the corresponding output
driver(s) and do not shut down the master oscillator or
the dividers.
Since the master oscillator frequency, fMOSC, is fixed,
the frequency of OUT0 and OUT1 is determined by
DIVIDER 0 and DIVIDER 1, respectively. And since
each output has its own divider, fOUT0 and fOUT1 can
be programmed independent of each other.
The frequency of the outputs are calculated as follows:
fOUT0 = fMOSC / 2X0= 1.048MHz / 2X0
fOUT1 = fMOSC / 2X1= 1.048MHz / 2X1
where X0is the DIVIDER 0 setting and X1is the
DIVIDER 1 setting. Valid values for X0and X1are inte-
gers 0 to 22 (dec).
Table 1 shows output frequencies and divider values
for the range of divider settings.
Table 1. Divider Settings and Output
Frequencies
DIVIDER SETTING
X0 OR X1DIVISOR
fOUT0 OR fOUT1
0 1 1.048MHz
1 2 0.524MHz
2 4 0.262MHz
3 8 0.131MHz
4 16 65.50kHz
5 32 32.75kHz
———
19 524,288 2Hz
20 1,048,576 1Hz
21 2,097,152 0.5Hz
22 4,194,304 0.25Hz
Functional Diagram
DS1099
GND
MASTER
OSCILLATOR
1.0MHz
DIVIDER 0
DIVIDE BY 4
DIVIDER 1
DIVIDE BY 8,192
VCC
VCC
OE1
OE0
OUT0
OUT1
fOUT0
fOUT1
fMOSC
FACTORY-
PROGRAMMED
EEPROM
OUTPUT
DRIVER
OUTPUT
DRIVER
DS1099
Low-Frequency Dual EconOscillator
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.
6_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
The divider settings, X0and X1, are factory pro-
grammed. When placing an order for the DS1099, it is
required to specify X0and X1. If only one output is used,
it is recommended that the unused output be disabled.
The oscillator outputs are asynchronous. Since the
master oscillator and dividers are free running, even
when both outputs are disabled, the state of the output
when OE becomes active is unknown for up to half an
fOUT period. When OE is brought low, the output is
enabled instantaneously. Likewise, if the output is dis-
abled while outputting the low half of a cycle, the out-
put instantaneously is forced high before the current
cycle is completed.
Application Information
Power-Supply Decoupling
To achieve best results, it is highly recommended that
a decoupling capacitor is used on the IC power-supply
pins. Typical values of decoupling capacitors are
0.01µF and 0.1µF. Use a high-quality, ceramic, sur-
face-mount capacitor, and mount it as close as possi-
ble to the VCC and GND pins of the IC to minimize lead
inductance.
Chip Topology
TRANSISTOR COUNT: 4221
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
Ordering Information (continued)
αα
αα DIVISOR fOUT
A2
01.048MHz
B2
10.524MHz
C2
20.262MHz
D2
30.131MHz
E2
465.50kHz
F2
532.750kHz
G2
616.375kHz
H2
78.187kHz
J2
84.093kHz
K2
92.046kHz
L2
10 1.023kHz
M
211 511.7Hz
N2
12 255.8Hz
P2
13 127.9Hz
Q2
14 63.96Hz
R2
15 31.98Hz
S2
16 16Hz
T2
17 8Hz
U2
18 4Hz
W
219 2Hz
X2
20 1Hz
Y2
21 0.5Hz
Z2
22 0.25Hz
Branding Information
The package branding includes α0and α1on the top
of the package next to or below 1099.
ENGLISH • •••• • ••• • •••
WHAT'S NEW PRODUCTS SOLUTIONS DESIGN APPNOTES SUPPORT BUY COMPANY MEMBERS
Maxim > Products > Timekeeping, Timers, and Counters Automotive Oscillators
DS1099
Low-Frequency Dual EconOscillator
Industry's Tightest Tolerance, All-Silicon, Dual Clock Oscillator
QuickView Technical Documents Ordering Info More Information All
Ordering Information
Notes:
1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within
one business day.
3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull
Data Sheet or Part Naming Conventions.
4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product
uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a
different suffix character.
Devices: 1-23 of 23
DS1099 Free
Sample Buy Package: TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp RoHS/Lead-Free?
Materials Analysis
DS1099U-ST uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C See data sheet
Materials Analysis
DS1099U-FF uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
DS1099U-01M/W uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
DS1099U-BC/W uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
DS1099U-C02/W uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
DS1099U-ST/W uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
DS1099U-WA+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-WA+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-AG+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-AG+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-PR/T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C See data sheet
Materials Analysis
Sample
Buy
Buy
Buy
Buy
Buy
Buy
Buy
Buy
Buy
Sample
Buy
Buy
DS1099U-FF/T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
DS1099U-BC/T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8-1*
-40°C to +85°C See data sheet
Materials Analysis
DS1099U-LU+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-CC+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-LU+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-FF+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-PR+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-FF+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-PR+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-CC+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS1099U-WT+ uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
Buy
Buy
Buy
Buy
Sample
Buy
Buy
Buy
Sample
Buy
Sample
Buy
Buy
Buy
DS1099U-WT+T uSOP;8 pin;16 mm²
Dwg: 21-0036J (PDF)
Use pkgcode/variation: U8+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
Didn't Find What You Need?
● Next Day Product Selection Assistance from Applications Engineers
● Parametric Search
● Applications Help
QuickView Technical Documents Ordering Info More Information
Description
Key Features
Applications/Uses
Key Specifications
Diagram
Data Sheet
Application Notes
Design Guides
Engineering Journals
Reliability Reports
Software/Models
Evaluation Kits
Price and Availability
Samples
Buy Online
Package Information
Lead-Free Information
Related Products
Notes and Comments
Evaluation Kits
2007-09-25
This page last modified: 2008-02-19
CONTACT US: FEEDBACK, QUESTIONS RATE THIS PAGE MAIL THIS PAGE
Copyright © 2008 by Maxim Integrated Products, Dallas Semiconductor • Legal Notices • Privacy Policy
">
Buy