DS1099U-WZ+

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
5 OE0
6 OE1
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)
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. VOLTAGE
OEO = OE1 = V
CC
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
T
A
= +25°C
DUTY CYCLE vs. SUPPLY VOLTAGE
OUT0 = OUT1 = 1MHz, C
L
= 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
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
FREQUENCY CHANGE vs. SUPPLY VOLTAGE
f
OUT
= 1MHz, T
A
= +25°C, C
L
= 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
f
OUT
= 1MHz, V
CC
= 4.0V, C
L
= 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
I
OL
(mA)
VOLTAGE (V)
15105
0.1
0.2
0.3
0.4
0.5
0
020
V
CC
= 2.7V, T
A
= +25°C
OUT0
OUT1
OUTPUT VOLTAGE HIGH vs. OUTPUT CURRENT
DS1099 toc09
I
OH
(mA)
VOH (V)
-1-2-3-4
2.3
2.4
2.5
2.6
2.7
2.8
2.2
-5 0
V
CC
= 2.7V, T
A
= +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, 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
X
0
= 1.048MHz / 2
X
0
f
OUT1
= f
MOSC
/ 2
X
1
= 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 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
X
0
OR X
1
DIVISOR f
OUT0
OR f
OUT1
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 2
X
(X = X
0
= 0...22)
DIVIDER 1
DIVIDE BY 2
X
(X = X
1
= 0...22)
V
CC
V
CC
OE1
OE0
OUT0
OUT1
f
OUT0
f
OUT1
f
MOSC
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, X
0
and X
1
, are factory pro-
grammed. When placing an order for the DS1099, it is
required to specify X
0
and X
1
. 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
f
OUT
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 V
CC
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 f
OUT
A2
0
1.048MHz
B2
1
0.524MHz
C2
2
0.262MHz
D2
3
0.131MHz
E2
4
65.50kHz
F2
5
32.750kHz
G2
6
16.375kHz
H2
7
8.187kHz
J2
8
4.093kHz
K2
9
2.046kHz
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 α
0
and α
1
on the top
of the package next to or below 1099.

DS1099U-WZ+

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Clock Generators & Support Products Low-Frequency Dual EconOscillator
Lifecycle:
New from this manufacturer.
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