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DS1099U-NT

器件型号:DS1099U-NT
器件类别:无源元件    振荡器   
文件大小:78KB,共6页
厂商名称:DALLAS
厂商官网:http://www.dalsemi.com
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器件描述

Oscillator,

参数
参数名称属性值
Reach Compliance Codeunknown
Base Number Matches1

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Rev 0; 2/04
Low-Frequency Dual EconOscillator
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.
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
Applications
Flashing LED Status Indicators
Consumer Appliances
Automotive
Servers
Printers
Switch-Mode Power Supplies
Ordering Information
PART
DS1099U-α
0
α
1
*
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 µSOP
*Where
α
0
and
α
1
specify the factory programmed divider set-
tings for OUT0 and OUT1, respectively.
Ordering information is continued on the last page.
EconOscillator is a trademark of Dallas Semiconductor.
Typical Operating Circuit
V
CC
V
CC
Pin Configuration
TOP VIEW
V
CC
OE0
OE1
N.C.
N.C.
OUT1 1
OUT0
OUT1
OUT0
V
CC
2
3
8
7
N.C.
N.C.
OE1
OEO
DS1099
GND
DS1099
6
5
GND 4
OE1 CAN INSTEAD
BE TIED TO V
CC
IF OUT1 IS NOT USED.
OUTPUTS CAPABLE OF
SINKING 16mA
µSOP
______________________________________________
Maxim Integrated Products
1
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.
Low-Frequency Dual EconOscillator
DS1099
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 +85°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 +85°C)
PARAMETER
Supply Voltage
Input Logic 1 (OE0,
OE1)
Input Logic 0 (OE0,
OE1)
SYMBOL
V
CC
V
IH
V
IL
CONDITIONS
(Note 1)
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
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted.)
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)
SYMBOL
I
STBY
I
CC
CONDITIONS
OE0
=
OE1
= V
CC
C
L
= 15pF per output,
OE0
=
OE1
= GND,
V
CC
= 3.3V
I
OH
= -1mA, V
CC
= MIN
I
OL
= 16mA
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
V
OH
V
OL
I
IH
I
IL
2
_____________________________________________________________________
Low-Frequency Dual EconOscillator
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°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
t
PU
t
R
, t
F
(Note 5)
C
L
= 15pF (both)
SYMBOL
f
MOSC
f
OUT0,
f
OUT1
∆f
OUT
∆f
OUT
∆f
OUT
T
A
= +25°C, V
CC
= 4.1V
T
A
= +25°C
2.7V to 5.5V, T
A
= +25°C
(Notes 3, 4)
-2.0
-100
45
CONDITIONS
MIN
TYP
1.048
MAX
UNITS
MHz
Hz
%
ppm/V
+2.5
+100
55
10
20
%
ppm/°C
%
ms
ns
DS1099
0.25
-1.0
3300
1,048,000
+1.0
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
All voltages referenced to ground.
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.
This is the change observed in output frequency due to changes in temperature or voltage.
This parameter is guaranteed by design.
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
V
CC
= 15pF, T
A
= +25°C
DS1099 toc01
SUPPLY CURRENT vs. TEMPERATURE
V
CC
= 5.5V, C
L
= 15pF
DS1099 toc02
SUPPLY CURRENT vs. OUTPUT LOAD
(BOTH OUTPUTS LOADED EQUALLY), T
A
= +25°C
DS1099 toc03
700
600
SUPPLY CURRENT (µA)
OUT0 = OUT1 = 1MHz
500
400
300
200
100
0
2.7
3.4
4.1
4.8
OUT0 =1MHz,
OUT1 = 0.25Hz
700
600
SUPPLY CURRENT (µA)
500
400
300
200
100
OUT0 = OUT1 = 0.25Hz
OUT0 =1MHz,
OUT1 = 0.25Hz
OUT0 = OUT1 = 1MHz
1.2
1.0
SUPPLY CURRENT (mA)
V
CC
= 5.5V
0.8
0.6
0.4
0.2
0
0
10
20
C
L
(pF)
30
40
V
CC
= 2.7V
V
CC
= 4.0V
OUT0 = OUT1 = 0.25Hz
0
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
50
_____________________________________________________________________
3
Low-Frequency Dual EconOscillator
DS1099
Typical Operating Characteristics (continued)
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. VOLTAGE
OEO = OE1 = V
CC
DS1099 toc04
DUTY CYCLE vs. SUPPLY VOLTAGE
OUT0 = OUT1 = 1MHz, C
L
= 15pF
DS1099 toc05
FREQUENCY CHANGE vs. SUPPLY VOLTAGE
f
OUT
= 1MHz, T
A
= +25°C, C
L
= 15pF
DS1099 toc06
180
170
SUPPLY CURRENT (µA)
160
150
140
130
120
110
100
2.7
3.4
4.1
4.8
T
A
= +25°C
52.0
T
A
= -40°C
DUTY CYCLE (% CHANGE)
51.0
1.0
FREQUENCY (% CHANGE)
5.5
0.5
50.0
T
A
= +25°C
49.0
T
A
= +85°C
0
-0.5
48.0
5.5
2.7
3.4
4.1
4.8
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
-1.0
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
FREQUENCY CHANGE vs. TEMPERATURE
f
OUT
= 1MHz, V
CC
= 4.0V, C
L
= 15pF
DS1099 toc07
OUTPUT VOLTAGE LOW vs. OUTPUT CURRENT
DS1099 toc08
OUTPUT VOLTAGE HIGH vs. OUTPUT CURRENT
V
CC
= 2.7V, T
A
= +25°C
DS1099 toc09
1.0
0.5
V
CC
= 2.7V, T
A
= +25°C
0.4
VOLTAGE (V)
2.8
2.7
2.6
VOH (V)
FREQUENCY (% CHANGE)
0.5
0.3
0
2.5
2.4
2.3
2.2
OUT0
OUT1
0.2
OUT0
OUT1
-0.5
0.1
-1.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
0
5
10
I
OL
(mA)
15
20
-5
-4
-3
-2
-1
0
I
OH
(mA)
Pin Description
PIN
1
2
3
4
5
6
7, 8
NAME
OUT1
OUT0
V
CC
GND
OE0
OE1
N.C.
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
4
_____________________________________________________________________
Low-Frequency Dual EconOscillator
Functional Diagram
DS1099
V
CC
V
CC
MASTER
OSCILLATOR
1.048MHz
f
MOSC
DIVIDER 0
DIVIDE BY 2
X
(X = X
0
= 0...22)
OUTPUT
DRIVER
f
OUT0
DS1099
GND
OUT0
FACTORY-
PROGRAMMED
EEPROM
DIVIDER 1
DIVIDE BY 2
X
(X = X
1
= 0...22)
OUTPUT
DRIVER
f
OUT1
OUT1
OE0
OE1
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-
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
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, 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
/ 2
X0
= 1.048MHz / 2
X0
f
OUT1
= f
MOSC
/ 2
X1
= 1.048MHz / 2
X1
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 inte-
gers 0 to 22 (dec).
Table 1 shows output frequencies and divider values
for the range of divider settings.
_____________________________________________________________________
5

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