DATASHEET
32.768 KHZ CLOCK OSCILLATOR
Description
The MK3200 is IDT’s lowest cost, low power clock oscillator
that generates a low power 32.768 kHz output from an
inexpensive 32.768 kHz crystal. This part includes a power
down pin and allows you to tri-state the output clock for
in-circuit testing.
IDT manufactures the largest variety of clock synthesizers
for all applications. If more clock outputs are needed,
including MHz frequencies, see the MK32xx family of parts.
Consult IDT to eliminate VCXOs, crystals and oscillators
from your board.
MK3200
Features
•
•
•
•
•
•
•
Packaged in 8-pin SOIC or 8-pin MSOP (3.00 mm body)
Pb (lead) free package
Operates from 2.5 V to 5 V
Consumes only 3.5 µA in normal operation
Accepts an inexpensive 32.768 kHz crystal input
Offers power down mode
Includes an Output Enable pin to tri-state the output for
in-circuit testing
•
Advanced, low power, sub-micron CMOS process
•
For other 32.768 kHz-based clocks with MHz outputs,
please consult IDT
•
Industrial temperature version available
Block Diagram
VDD
Power Down
X1
32.768 kHz
Crystal
X2
Crystal
Oscillator
32.768 kHz
Clock
GND
OE
IDT®
32.768 KHZ CLOCK OSCILLATOR
1
MK3200
REV H 073012
MK3200
32.768 KHZ CLOCK OSCILLATOR
32 KHZ OSCILLATOR
Pin Assignment
X1
VDD
GND
32. 768k
1
2
3
4
8
7
6
5
X2
GND
PD
OE
Power Down Select Table
PD
0
1
32.768k
On
Low
Oscillator
On
Off
Output Enable Select Table
OE
0
1
32.768k
Tri state (Hi-Z)
On
Oscillator
On
On
8-pin (150 mil) SOIC or
8-pin MSOP (3.00 mm body)
0 = connect directly to GND.
1 = connect directly to VDD.
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
X1
VDD
GND
32.768k
OE
PD
GND
X2
Pin
Type
Input
Power
Power
Input
Output
Input
Input
Output
Pin Description
Crystal connection. Connect to a 32.768 kHz crystal.
Connect to +3.3 V.
Connect to ground.
32.768 kHz clock output.
Output Enable.
Power down pin. Turns off entire chip when high.
Connect to ground.
Crystal connection. Connect to a 32.768 kHz crystal.
IDT®
32.768 KHZ CLOCK OSCILLATOR
2
MK3200
REV H 073012
MK3200
32.768 KHZ CLOCK OSCILLATOR
32 KHZ OSCILLATOR
External Components
Series Termination Resistor
Clock output traces over one inch should use series
termination. To series terminate a 50Ω trace (a commonly
used trace impedance), place a 33Ω resistor in series with
the clock line, as close to the clock output pin as possible.
The nominal impedance of the clock output is 20Ω.
Decoupling Capacitor
As with any high-performance mixed-signal IC, the MK3200
must be isolated from system power supply noise to perform
optimally.
A decoupling capacitor of 0.01µF must be connected
between VDD and the PCB ground plane.
PCB Layout Recommendations
For optimum device performance and lowest output phase
noise, the following guidelines should be observed.
1) The 0.01µF decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible. No vias should be used between the decoupling
capacitor and VDD pin. The PCB trace to VDD pin should
be kept as short as possible, as should the PCB trace to the
ground via. Distance of the ferrite bead and bulk decoupling
from the device is less critical.
2) To minimize EMI, the 33Ω series termination resistor (if
needed) should be placed close to the clock output.
3) An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers. Other signal traces should be routed away from the
MK3200. This includes signal traces just underneath the
device, or on layers adjacent to the ground plane layer used
by the device.
4) The input crystal must be connected as close to the chip
as possible. The input crystal should be a parallel mode
crystal with a 12 pF load capacitance.
IDT®
32.768 KHZ CLOCK OSCILLATOR
3
MK3200
REV H 073012
MK3200
32.768 KHZ CLOCK OSCILLATOR
32 KHZ OSCILLATOR
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK3200. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Parameter
Supply Voltage, VDD
Inputs
Clock Outputs
Storage Temperature
Soldering Temperature
Junction Temperature
Condition
Referenced to GND
Referenced to GND
Referenced to GND
Max 10 seconds
Min.
-0.5
-0.5
-65
Typ.
Max.
7
VDD+ 0.5
VDD+ 0.5
150
260
125
Units
V
V
V
°
C
°
C
°
C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Min.
-40
+3.15
Typ.
+3.3
Max.
+85
+3.45
Units
°
C
V
DC Electrical Characteristics
Unless stated otherwise,
VDD = 3.3 V ±5%,
Ambient Temperature -40 to +85° C
Parameter
Operating Voltage
Supply Current
Output High Voltage
(CMOS level)
Output High Voltage
Output Low Voltage
Short Circuit Current
Symbol
VDD
IDD
V
OH
V
OH
V
OL
I
OS
Conditions
No load, OE=1
PD = 0
I
OH
= -1.5 mA
I
OH
= -3 mA
I
OL
= 3mA
Min.
2.375
Typ.
3.5
3.5
Max.
5.250
Units
V
μA
μA
V
V
VDD-0.4
2.4
0.4
±6
V
mA
IDT®
32.768 KHZ CLOCK OSCILLATOR
4
MK3200
REV H 073012
MK3200
32.768 KHZ CLOCK OSCILLATOR
32 KHZ OSCILLATOR
AC Electrical Characteristics
Unless stated otherwise,
VDD = 3.3 V ±5%,
Ambient Temperature -40 to +85° C
Parameter
Input Frequency
Output Rise Time
Output Fall Time
Duty Cycle
Input Crystal Accuracy
Symbol
F
IN
t
OR
t
OF
Conditions
20% to 80%, Note 1
80% to 20%, Note 1
at VDD/2
Min.
Typ.
32.768
8
8
Max. Units
kHz
ns
ns
60
±30
%
ppm
40
50
0
Thermal Characteristics (8SOIC)
Parameter
Thermal Resistance Junction to
Ambient
Symbol
θ
JA
θ
JA
θ
JA
θ
JC
Conditions
Still air
1 m/s air flow
3 m/s air flow
Min.
Typ.
135
93
78
60
Max. Units
°
C/W
°
C/W
°
C/W
°
C/W
Thermal Resistance Junction to Case
Thermal Characteristics (8MSOP)
Parameter
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
Symbol
θ
JA
θ
JC
Conditions
Still air
Min.
Typ.
95
48
Max. Units
°
C/W
°
C/W
IDT®
32.768 KHZ CLOCK OSCILLATOR
5
MK3200
REV H 073012
京公网安备 11010802033920号
EEWORLD
