spread-spectrum (dithered) square-wave output of fre-
quencies from 130kHz to 66.6MHz. The DS1089L is
shipped from the factory programmed at a specific
frequency. The DS1089L is pin-for-pin compatible with
the DS1087L, however, the DS1089L dithers at equal
percentages above and below the center frequency. The
user still has access to the internal frequency divider,
selectable ±1%, ±2%, ±4%, or ±8% dithered output, dith-
ering rate, and programmable output power-down/disable
mode through an I
2
C-compatible programming interface.
All the device settings are stored in nonvolatile (NV)
EEPROM allowing it to operate in stand-alone applica-
tions. The DS1089L also has power-down and output-en-
able control pins for power-sensitive applications.
●
●
●
●
●
Features
●
Factory-Programmed Square-Wave Generator from
33.3MHz to 66.6MHz
●
Center Frequency Remains Constant Independent of
Dither Percentage
●
No External Timing Components Required
●
EMI Reduction
●
Variable Dither Frequency
●
User Programmable Down to 130kHz with Divider
(Dependent on Master Oscillator Frequency)
●
±1%, ±2%, ±4%, or ±8% Selectable Dithered Output
●
Glitchless Output-Enable Control
●
I
2
C-Compatible Serial Interface
●
Nonvolatile Settings
●
Power-Down Mode
●
Programmable Output Power-Down/Disable Mode
Applications
Printers
Copiers
Computer Peripherals
POS Terminals
Cable Modems
Ordering Information
PART
DS1089LU-yxx*
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 µSOP (118 mil)
*See Standard Frequency Options Table.
Pin Configuration and Typical Operating Circuits appear at
end of data sheet.
Standard Frequency Options
PART
DS1089LU-21G
DS1089LU-4CL
DS1089LU-22F
DS1089LU-23C
DS1089LU-450
DS1089LU-866
DS1089LU-yxx
Add “/T” for Tape and Reel.
Custom frequencies available, contact factory.
FREQUENCY (MHz)
14.7456
18.432
24.576
33.3
50.0
66.6
Fixed up to 66.6
SPREAD (±%)
1
2
1
1
2
4
1, 2, 4, or 8
DITHER FREQUENCY
f
MOSC
/4096
f
MOSC
/4096
f
MOSC
/2048
f
MOSC
/4096
f
MOSC
/4096
f
MOSC
/2048 or 4096 or 8192
f
MOSC
/4096
EconOscillator is a trademark of Maxim Integrated Products, Inc.
19-7501; Rev 3; 2/15
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
Absolute Maximum Ratings
Voltage on VCC Relative to Ground ....................-0.5V to +6.0V
Voltage on SPRD, PDN, OE, SDA,
SCL Relative to Ground* ...................... -0.5V to (V
CC
+ 0.5V)
Operating Temperature Range ........................... -40°C to +85°C
*This voltage must not exceed 6.0V.
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range ............................ -55°C to +125°C
Soldering Temperature ................. See IPC/JEDEC J-STD-020A
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 Operating Conditions
(T
A
= -40°C to +85°C.)
PARAMETER
Supply Voltage
High-Level Input Voltage
(SDA, SCL, SPRD, PDN, OE)
Low-Level Input Voltage
(SDA, SCL, SPRD, PDN, OE)
SYMBOL
V
CC
V
IH
V
IL
(Note 1)
CONDITION
MIN
2.7
0.7 x V
CC
-0.3
TYP
3.3
MAX
3.6
V
CC
+
0.3
0.3 x
V
CC
UNITS
V
V
V
DC Electrical Characteristics
(V
CC
= +2.7V to +3.6V, T
A
= -40°C to +85°C.)
PARAMETER
High-Level Output Voltage (OUT)
Low-Level Output Voltage (OUT)
Low-Level Output Voltage (SDA)
High-Level Input Current
Low-Level Input Current
Supply Current (Active)
Standby Current (Power-Down)
SYMBOL
V
OH
V
OL1
V
OL2
I
IH
I
IL
V
OL
I
OL
= 4mA
CONDITION
I
OH
= -4mA, V
CC
= min
3mA sink current
6mA sink current
V
IH
= V
CC
V
IL
= 0V
C
L
= 15pF, f
OUT
= f
MOSCmax
Power-down mode
-1
12
10
MIN
2.4
0.4
0.4
0.6
1
TYP
MAX
UNITS
V
V
V
µA
µA
mA
µA
I
CCQ
I
CC
www.maximintegrated.com
Maxim Integrated
│
2
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
Master Oscillator Characteristics
(V
CC
= +2.7V to +3.6V, T
A
= -40°C to +85°C.)
PARAMETER
SYMBOL
Internal Master Oscillator
Frequency
Master Oscillator Frequency
Tolerance
Voltage Frequency
Variation
Temperature Frequency Variation
(Note 4)
Dither Frequency Range
(Note 5)
f
MOSC
∆
f
MOSC
f
MOSC
∆
f
f
MOSC
∆
f
f
MOSC
CONDITION
MIN
33.3
TYP
MAX
66.6
+0. 5
+0.75
+0.75
+0.75
UNITS
MHz
%
%
%
V
CC
= 3.3V,
T
A
= +25°C (Notes 2, 10)
T
A
= +25°C (Note 3)
V
CC
= 3.3V,
f
OUT
= f
MOSCmax
J3 = J2 = GND
J3 = GND, J2 = V
CC
J3 = J2 = V
CC
J3 = V
CC
, J2 = GND
J1 = GND, J0 = V
CC
J1 = J0 = V
CC
T
A
= 0°C to +85°C
T
A
= -40°C to 0°C
-0. 5
-0.75
-0.75
-2.00
±1
±2
±4
±8
f
MOSC
/ 2048
f
MOSC
/ 4096
f
MOSC
/ 8192
%
Dither Frequency
(Note 5)
f
MOD
J1 = V
CC
, J0 = GND
Hz
AC Electrical Characteristics
(V
CC
= +2.7V to +3.6V, T
A
= -40°C to +85°C.)
PARAMETER
Frequency Stable After
PRESCALER Change
Power-Up Time
Enable of OUT After Exiting
Power-Down Mode
OUT Disabled After Entering
Power-Down Mode
Load Capacitance
Output Duty Cycle (f
OUT
)
t
POR
+
t
STAB
t
STAB
t
PDN
C
L
(Note 6)
(Note 6)
7
15
50
50
40
SYMBOL
CONDITION
MIN
TYP
MAX
1
200
512
UNITS
Period
µs
clock
cycles
µs
pF
%
www.maximintegrated.com
Maxim Integrated
│
3
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
AC Electrical Characteristics—I
2
c Interface
PARAMETER
SCL Clock Frequency
Bus Free Time Between Stop and
Start Conditions
Hold Time (Repeated) Start
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
Start Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Setup Time
SDA and SCL Capacitive
Loading
EEPROM Write Time
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
HIGH
t
LOW
(Note 7)
(V
CC
= +2.7V to +3.6V, T
A
= -40°C to +85°C, unless otherwise noted. Timing referenced to V
IL(MAX)
and V
IH(MIN)
.)
CONDITIONS
MIN
0
1.3
0.6
1.3
0.6
0
100
0.6
(Note 8)
(Note 8)
(Note 8)
(Note 9)
10
20 + 0.1CB
20 + 0.1CB
0.6
300
300
400
20
0.9
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
µs
pF
ms
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
C
B
t
WR
Nonvolatile Memory Characteristics
(V
CC
= +2.7V to +3.6V.)
Writes
Note
Note
Note
Note
Note
1:
2:
3:
4:
5:
PARAMETER
SYMBOL
+70°C
CONDITION
MIN
10,000
TYP
MAX
UNITS
All voltages are referenced to ground.
This is the absolute accuracy of the master oscillator frequency at the default settings with spread disabled.
This is the change that is observed in master oscillator frequency with changes in voltage at T
A
= +25°C.
This is the change that is observed in master oscillator frequency with changes in temperature at V
CC
= 3.3V.
The dither deviation of the master oscillator frequency is bidirectional and results in an output frequency centered at the
undithered frequency.
Note 6:
This indicates the time elapsed between power-up and the output becoming active. An on-chip delay is intentionally intro-
duced to allow the oscillator to stabilize. t
STAB
is equivalent to 512 master clock cycles and will depend on the programmed
master oscillator frequency.
Note 7:
Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I
2
C standard-mode timing.
Note 8:
C
B
—total capacitance of one bus line in picofarads.
Note 9:
EEPROM write time applies to all the EEPROM memory and SRAM shadowed EEPROM memory when WC = 0.
The EEPROM write time begins after a stop condition occurs.
Note 10:
Typical frequency shift due to aging is ±0.25%. Aging stressing includes Level 1 moisture reflow conditioning (24hr) +125°C
bake, 168hr +85°C/85°RH moisture soak, and three solder reflow passes +269 +0/-5°C peak) followed by 408hr max V
CC
biased 125°C HTOL, 500 temperature cycles at -55°C to +125°C, 96hr +130°C/85%RH/3,6V HAST and 168hr +121°C/2
京公网安备 11010802033920号
EEWORLD
