For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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
requirements.
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 +125°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
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
DS1099
Typical Operating Circuit
Rev 1; 9/07
PART TEMP RANGE PIN-PACKAGE
DS1099U- O 1 -40°C to +125°C 8 μSOP
EconOscillator is a trademark of Dallas Semiconductor.
Ordering information is continued on the last page.
*
Where
α
0and
α
1specify the factory programmed divider set-
tings for OUT0 and OUT1, respectively.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
DS1099
Low-Frequency Dual EconOscillator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATING CONDITIONS
(TA= -40°C to +125°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 +125°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 +125°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Standby Supply Current ISTBY OE0 = OE1 = VCC 145 275 μA
1.048MHz (both) 323
4kHz (both) 146
Active Supply Current (Note 2) ICC
CL = 15pF per output,
OE0 = OE1 = GND,
VCC = 3.3V 1Hz (both) 145
μA
High-Level Output Voltage
(OUT0, OUT1) VOH I
OH = -1mA, VCC = MIN 2.4 V
Low-Level Output Voltage
(OUT0, OUT1) VOL IOL = 16mA (-40°C to +85°C)
IOL = 12mA (-40°C to +125°C) 0.4 V
High-Level Input Current
(OE0,OE1)IIH V
IH = VCC +1.0 μA
Low-Level Input Current
(OE0,OE1)IIL V
IL = 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 +125°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Master Oscillator Frequency fMOSC 1.048 MHz
Nominal Output Frequency fOUT0,
fOUT1 0.25 1,048,000 Hz
Output Frequency Tolerance ΔfOUT TA = +25°C, VCC = 4.1V -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.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
CL = 15pF, TA = +25°C
DS1099 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
4.84.13.4
100
200
300
400
500
600
700
0
2.7 5.5
OUT0 = OUT1 = 1MHz
OUT0 = OUT1 = 0.25Hz
OUT0 =1MHz,
OUT1 = 0.25Hz
SUPPLY CURRENT vs. TEMPERATURE
VCC = 5.5V, CL = 15pF
DS1099 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
603510-15
100
200
300
400
500
600
700
0
-40 85
OUT0 = OUT1 = 1MHz
OUT0 = OUT1 = 0.25Hz
OUT0 =1MHz,
OUT1 = 0.25Hz
SUPPLY CURRENT vs. OUTPUT LOAD
(BOTH OUTPUTS LOADED EQUALLY), TA = +25°C
DS1099 toc03
CL (pF)
SUPPLY CURRENT (mA)
40302010
0.2
0.4
0.6
0.8
1.0
1.2
0
050
VCC = 5.5V
VCC = 4.0V
VCC = 2.7V
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.)
SUPPLY CURRENT vs. VOLTAGE
OEO = OE1 = VCC
DS1099 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
4.84.13.4
110
120
130
140
150
160
170
180
100
2.7 5.5
TA = +25°C
DUTY CYCLE vs. SUPPLY VOLTAGE
OUT0 = OUT1 = 1MHz, CL = 15pF
DS1099 toc05
SUPPLY VOLTAGE (V)
DUTY CYCLE (% CHANGE)
4.84.13.4
49.0
50.0
51.0
52.0
48.0
2.7 5.5
TA = -40°C
TA = +25°C
TA = +85°C
FREQUENCY CHANGE vs. SUPPLY VOLTAGE
fOUT = 1MHz, TA = +25°C, CL = 15pF
DS1099 toc06
SUPPLY VOLTAGE (V)
FREQUENCY (% CHANGE)
4.84.13.4
-0.5
0
0.5
1.0
-1.0
2.7 5.5
FREQUENCY CHANGE vs. TEMPERATURE
fOUT = 1MHz, VCC = 4.0V, CL = 15pF
DS1099 toc07
TEMPERATURE (°C)
FREQUENCY (% CHANGE)
603510-15
-0.5
0
0.5
1.0
-1.0
-40 85
OUTPUT VOLTAGE LOW vs. OUTPUT CURRENT
DS1099 toc08
IOL (mA)
VOLTAGE (V)
15105
0.1
0.2
0.3
0.4
0.5
0
020
VCC = 2.7V, TA = +25°C
OUT0
OUT1
OUTPUT VOLTAGE HIGH vs. OUTPUT CURRENT
DS1099 toc09
IOH (mA)
VOH (V)
-1-2-3-4
2.3
2.4
2.5
2.6
2.7
2.8
2.2
-5 0
VCC = 2.7V, TA = +25°C
OUT0
OUT1
DS1099
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
GND
MASTER
OSCILLATOR
1.048MHz
DIVIDER 0
DIVIDE BY 2X
(X = X0 = 0...22)
DIVIDER 1
DIVIDE BY 2X
(X = X1 = 0...22)
VCC
VCC
OE1
OE0
OUT0
OUT1
fOUT0
fOUT1
fMOSC
FACTORY-
PROGRAMMED
EEPROM
OUTPUT
DRIVER
OUTPUT
DRIVER
DS1099
Low-Frequency Dual EconOscillator
_______________________________________________________________________________________ 5
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
© 2007 Maxim Integrated Products 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.
Revision History
Pages changed at Rev 1: 1, 2, 3, 5, 6
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
M2
11 511.7Hz
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
W2
19 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.
