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.
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)
Applications
●
●
●
●
●
Flashing LED Status Indicators
Consumer Appliances
Servers
Printers
Switch-Mode Power Supplies
Ordering Information
PART
DS1099U-
a
O
a
1
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
8 µSOP
*Where
α
0 and
α
1 specify the factory-programmed divider
settings for OUT0 and OUT1, respectively.
Ordering information is continued on the last page.
EconOscillator is a trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
V
CC
V
CC
Pin Configuration
TOP VIEW
V
CC
OE0
OE1
N.C.
N.C.
DS1099
GND
OUT1
OUT0
OUT1
OUT0
V
CC
1
2
3
8
N.C.
N.C.
OE1
OEO
DS1099
7
6
5
GND 4
OE1 CAN INSTEAD
BE TIED TO V
CC
IF OUT1 IS NOT USED.
OUTPUTS CAPABLE OF
SINKING 16mA
µSOP
19-7629; Rev 2; 5/15
DS1099
Low-Frequency Dual EconOscillator
Absolute Maximum Ratings
Voltage Range on V
CC
Relative to Ground .........-0.5V to +6.0V
Voltage Range on
OE0
and
OE1
Relative to Ground .................................. -0.5V to (V
CC
+ 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
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 DC Operating Conditions
(T
A
= -40°C to +125°C)
Supply Voltage
Input Logic 1 (OE0,
OE1)
Input Logic 0 (OE0,
OE1)
PARAMETER
SYMBOL
V
CC
V
IH
V
IL
(Note 1)
CONDITIONS
MIN
2.7
0.7 x
V
CC
-0.3
TYP
MAX
5.5
V
CC
+
0.3
+0.3 x
V
CC
UNITS
V
V
V
DC Electrical Characteristics
PARAMETER
Standby Supply Current
Active Supply Current (Note 2)
High-Level Output Voltage
(OUT0, OUT1)
Low-Level Output Voltage
(OUT0, OUT1)
High-Level Input Current
(OE0,
OE1)
Low-Level Input Current
(OE0,
OE1)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted.)
SYMBOL
I
STBY
I
CC
CONDITIONS
OE0
=
OE1
= V
CC
CL = 15pF per output,
OE0
=
OE1
= GND,
V
CC
= 3.3V
V
OH
V
OL
I
IH
I
IL
I
OH
= -1mA, V
CC
= MIN
I
OL
= 16mA (-40°C to +85°C)
I
OL
= 12mA (-40°C to +125°C)
V
IH
= V
CC
V
IL
= 0.0V
-1.0
1.048MHz (both)
4kHz (both)
1Hz (both)
2.4
0.4
+1.0
MIN
TYP
145
323
146
145
V
V
µA
µA
µA
MAX
275
UNITS
µA
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Maxim Integrated
│
2
DS1099
Low-Frequency Dual EconOscillator
AC Electrical Characteristics
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted.)
PARAMETER
Master Oscillator Frequency
Nominal Output Frequency
Output Frequency Tolerance
Voltage Frequency Variation
(Note 3)
Temperature Frequency Variation
Output Duty Cycle
Power-Up Time
Output Rise/Fall Time
SYMBOL
f
MOSC
f
OUT0
,
f
OUT1
∆f
OUT
∆f
OUT
∆f
OUT
t
PU
T
A
= +25°C, V
CC
= 4.1V
T
A
= +25°C
2.7V to 5.5V, T
A
= +25°C
(Notes 3, 4)
(Note 5)
C
L
= 15pF (both)
0.25
-1.0
3300
-2.0
-100
45
+2.5
+100
55
10
20
CONDITIONS
MIN
TYP
1.048
1,048,000
+1.0
MAX
UNITS
MHz
Hz
%
ppm/V
%
ppm/°C
%
ms
ns
t
R
, t
F
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 = (C
LOAD
+ 12pF ) x V
CC
x f
OUT
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.
Typical Operating Characteristics
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
C
L
= 15pF, T
A
= +25°C
DS1099 toc01
DS1099 toc02
600
SUPPLY CURRENT (µA)
500
400
300
200
100
0
500
400
300
200
100
SUPPLY CURRENT (mA)
SUPPLY CURRENT (µA)
OUT0 = OUT1 = 1MHz
600
OUT0 = OUT1 = 1MHz
1.0
0.8
0.6
0.4
0.2
0
V
CC
= 2.7V
V
CC
= 4.0V
V
CC
= 5.5V
OUT0 =1MHz,
OUT1 = 0.25Hz
OUT0 = OUT1 = 0.25Hz
2.7
3.4
4.1
4.8
5.5
OUT0 =1MHz,
OUT1 = 0.25Hz
OUT0 = OUT1 = 0.25Hz
-40
-15
10
35
60
85
0
0
10
20
C
L
(pF)
30
40
50
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
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Maxim Integrated
│
3
DS1099 toc03
700
700
SUPPLY CURRENT vs. TEMPERATURE
V
CC
= 5.5V, C
L
= 15pF
1.2
SUPPLY CURRENT vs. OUTPUT LOAD
(BOTH OUTPUTS LOADED EQUALLY), T
A
= +25°C
DS1099
Low-Frequency Dual EconOscillator
Typical Operating Characteristics (continued)
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
DS1099 toc04
DS1099 toc05
170
SUPPLY CURRENT (µA)
160
150
140
130
120
110
100
2.7
T
A
= +25°C
T
A
= -40°C
DUTY CYCLE (% CHANGE)
51.0
FREQUENCY (% CHANGE)
0.5
50.0
T
A
= +25°C
49.0
T
A
= +85°C
0
-0.5
3.4
4.1
4.8
5.5
48.0
2.7
3.4
4.1
4.8
5.5
-1.0
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
DS1099 toc07
DS1099 toc08
FREQUENCY (% CHANGE)
0.5
VOLTAGE (V)
0.4
0.3
0.2
0.1
0
V
CC
= 2.7V, T
A
= +25°C
2.7
2.6
VOH (V)
2.5
2.4
2.3
2.2
V
CC
= 2.7V, T
A
= +25°C
0
-0.5
OUT0
OUT1
OUT0
OUT1
-1.0
-40
-15
10
35
60
85
0
5
10
I
OL
(mA)
15
20
-5
-4
-3
-2
-1
0
TEMPERATURE (
°
C)
I
OH
(mA)
Pin Description
PIN
1
2
3
4
5
6
7, 8
NAME
OUT1
OUT0
GND
OE0
OE1
N.C.
V
CC
FUNCTION
Oscillator Outputs. Each output is forced high when the corresponding
OE
is high.
Positive Supply Terminal
Ground
Output Enable for OUT0 and OUT1, respectively. When low, the outputs are enabled. When high, the
corresponding output is disabled (forced high).
No Connection
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Maxim Integrated
│
4
DS1099 toc09
1.0
FREQUENCY CHANGE vs. TEMPERATURE
f
OUT
= 1MHz, V
CC
= 4.0V, C
L
= 15pF
0.5
OUTPUT VOLTAGE LOW vs. OUTPUT CURRENT
OUTPUT VOLTAGE HIGH vs. OUTPUT CURRENT
2.8
DS1099 toc06
180
SUPPLY CURRENT vs. VOLTAGE
OEO = OE1 = V
CC
52.0
DUTY CYCLE vs. SUPPLY VOLTAGE
OUT0 = OUT1 = 1MHz, C
L
= 15pF
1.0
FREQUENCY CHANGE vs. SUPPLY VOLTAGE
f
OUT
= 1MHz, T
A
= +25
°
C, C
L
= 15pF
DS1099
Low-Frequency Dual EconOscillator
Functional Diagram
V
CC
V
CC
GND
MASTER
OSCILLATOR
1.048MHz
f
MOSC
DIVIDER 0
DIVIDE BY 2
X
(X = X
0
= 0...22)
DS1099
FACTORY-
PROGRAMMED
EEPROM
OUTPUT
DRIVER
f
OUT0
OUT0
DIVIDER 1
DIVIDE BY 2
X
(X = X
1
= 0...22)
OUTPUT f
OUT1
DRIVER
OUT1
OE0
OE1
Detailed Description
The DS1099 consists of a fixed-frequency 1.048MHz
master oscillator followed by two independent facto-
ry-programmable dividers. The two divider outputs
are connected to pins OUT0 and OUT1, which are
Table 1. Divider Settings and Output
Frequencies
DIVIDER SETTING
X
0
OR X
1
0
1
2
3
4
5
—
19
20
21
22
DIVISOR
1
2
4
8
16
32
—
524,288
1,048,576
2,097,152
4,194,304
f
OUT0
OR f
OUT1
1.048MHz
0.524MHz
0.262MHz
0.131MHz
65.50kHz
32.75kHz
—
2Hz
1Hz
0.5Hz
0.25Hz
independently enabled/disabled using the output-enable
pins,
OE0
and
OE1,
respectively. When the output-en-
able 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, f
MOSC
, 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, f
OUT0
and f
OUT1
can be programmed
independent of each other.
The frequency of the outputs are calculated as follows:
f
OUT0
= f
MOSC
/2X0 = 1.048MHz/2
X
0
f
OUT1
= f
MOSC
/2X1 = 1.048MHz/2
X
1
where X
0
is the DIVIDER 0 setting and X
1
is the DIVIDER
1 setting. Valid values for X
0
and X
1
are integers 0 to 22
(dec).
Table 1 shows output frequencies and divider values for
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