MK3235-02SLF [IDT]
Clock Generator, 14.3MHz, PDSO16, SOIC-16;
| 型号： | MK3235-02SLF |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, 14.3MHz, PDSO16, SOIC-16 光电二极管 |
| 文件： | 总4页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK3235
Handheld System Clock Synthesizer
Description
Features
The MK3235 is the smallest size, lowest power
system clock synthesizer available. It is the ideal
way to generate clocks for handheld computers,
such as PDAs, PICs, and other devices where
low power is required. Using analog Phase-
Locked Loop (PLL) techniques, the device
operates from a single 32.768 kHz crystal to
produce the 32.768kHz, 14.318MHz, and serial
communications output clock.
• Input crystal frequency of 32.768 kHz
• Lowest power solution available
• Lowest profile clock solution where height is critical
• Three output clocks
• 3.3V or 5.0V operation
• Duty cycle of 45/55
• 14.3 MHz or 14.3 MHz + Comm clock power downs
• Separate battery supply pin for 32 kHz runs to 2V
• IDD less than 4µA when 32 kHz running
• Packaged in 16 pin narrow SOIC
The device has three power down modes for the
14.3 MHz, communications, and 32.768 kHz
clock.
The MK3235 can save board space and cost
even if it only replaces the 32 kHz oscillator
circuitry and one additional surface mount crystal
or oscillator. The extremely low IDD, the ease of
surface mounting, and the power down
capability are added benefits in using the part.
Block Diagram
VDD GND
14.318MHz
Clock Synthesis
PD14
Output
Buffer
14.3 MHz
and Control Circuitry
PDCOMM
PD
Communications
Clock Synthesis
and Control Circuitry
Output
Buffer
3.686 MHz
VDD32
32.768 kHz
crystal
X1
Crystal
Oscillator
Output
Buffer
32.768 kHz
X2
MDS 3235 E
1
Revision 010302
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com
MK3235
Handheld System Clock Synthesizer
Pin Assignment
1
16
15
14
13
12
11
10
GND
GND
VDD
X2
X1
VDD32
VDD
2
3
4
5
PD14
GND
GND
6
7
14.3M
COMMCLK
32K
PD
8
9
GND
PDCOMM
Pin Descriptions
Number
Name
X2
Type Description
1
2
O
I
Crystal connection. Connect to 32.768 kHz crystal.
Crystal connection. Connect to 32.768 kHz crystal.
X1
3
VDD32
VDD
P
P
P
O
O
I
Separate power supply connection for 32.768kHz clock. Will operate to 2.0V.
Connect to +3.3V or +5V. Must be the same voltage as pin 14.
Connect to ground.
4
5
GND
6
COMMCLK
32K
Serial communications (3.68 MHz clock output).
32.768 kHz square wave clock output.
7
8
PDCOMM
GND
Power Down serial Communications and 14.3M clock outputs (stop low) when low.
Connect to ground.
9
P
I
10
11
12
13
14
15
16
PD
Powers Down everything but 32kHz oscillator internally. 32kHz output buffer is off.
14.318 MHz output clock.
14.3M
GND
O
P
I
Connect to ground.
PD14
VDD
Power Down 14.318MHz clock output (stops low) when low.
Connect to +3.3V or +5V. Must be the same voltage as pin 4.
Connect to ground.
P
P
P
GND
GND
Connect to ground.
Type: I = Input, O = output, P = power supply connection
Power Down status: Output clocks will stop in a low state when powered down
External Components
The MK3235 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.1µF should be connected between VDD and GND, and VDD32 and GND, as close to the MK3235 as possible. A
series resistor should be used on the VDD32 supply. A series termination resistor of 33W may be used for each
clock output, except the 32.768 kHz. For tuning the real time clock output, use a 32.768 kHz crystal with a load
capacitance of 12.5pF, and connect a 20pF±5% (NPO dielectric) capacitor between each crystal pin and ground.
The 32.768 kHz crystal must be connected as close to the chip as possible. Consult ICS for a recommended
external circuit schematic.
MDS 3235 E
2
Revision 010302
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com
MK3235
Handheld System Clock Synthesizer
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply Voltage, VDD
Referenced to GND
Referenced to GND
7
VDD+0.5
70
V
V
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
-0.5
0
°C
°C
°C
Max of 30 seconds
260
Storage Temperature
-65
150
DC CHARACTERISTICS (at 5.0V unless otherwise noted)
Operating Voltage, VDD
3.0
2.0
2.0
5.5
5.5
V
V
Operating Voltage,VDD32
Input High Voltage, VIH
VDD=5V
V
Input Low Voltage, VIL
VDD=5V
0.8
V
Output High Voltage, VOH, 3.3V or 5V
Output High Voltage, VOH
IOH=-4mA
VDD-0.4
2.4
V
VDD=5V, IOH=-25mA
VDD=5V, IOL=25mA
VDD=3.3V
V
Output Low Voltage, VOL
0.4
0.4
0.4
V
Input High Voltage, VIH
1.9
2.4
V
Input Low Voltage, VIL
VDD=3.3V
V
Output High Voltage, VOH
VDD=3.3V, IOH=-8mA
VDD=3.3V, IOL=8mA
No Load
V
Output Low Voltage, VOL
V
IDD Operating Supply Current, 5V
IDD32 with only 32 kHz running, 5V
IDD Operating Supply Current, 3.3V
IDD32 with only 32 kHz output running, 3.3V
IDD32, only 32 kHz osc. running, 3.3V, note 2
Short Circuit Current, 5V
9
3.5
6
mA
µA
mA
µA
µA
mA
mA
pF
No Load
No Load
No Load
2.5
1
32kHz output off. PD=0
32kHz output
14 MHz/3.686 MHz outputs
±30
±80
7
Short Circuit Current, 5V
Input Capacitance
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
Input Frequency
32.768
kHz
ns
Output Clock Rise and Fall Time, 0.2 to 0.8VDD
2
Output Clock Duty Cycle, all MHz clocks
32.768 kHz Clock Duty Cycle
At VDD/2
45
49 to 51
57
55
%
At VDD32/2
%
Absolute Clock Period Jitter
14.318 MHz/3.686 MHz
-500
500
ps
Power up time, to all clocks stable, 32k running VDD=3.3 or 5V
9
ms
ms
ms
Power on time,VDD32=0V to all clocks stable
Power on time, all power down pins taken high
32.768kHz crystal with ESR £25kW
32.768kHz oscillator running
500
15
1000
Note 1: Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the
device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect
device reliability.
Note 2: When PD=0 (low) and VDD32 is greater than 2.0V, then the 32kHz oscillator will continue to run on the chip,
but the output is turned off. This allows for a quick power-up (<20ms), while the chip is only consuming
approximately 1µA.
MDS 3235 E
3
Revision 010302
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com
MK3235
Handheld System Clock Synthesizer
Package Outline and Package Dimensions
16 pin SOIC narrow
Inches
Millimeters
Min Max
Symbol Min
Max
A
b
0.055 0.068 1.397 1.7272
0.013 0.019 0.330 0.483
0.007 0.010 0.191 0.254
0.385 0.400 9.779 10.160
0.150 0.160 3.810 4.064
0.225 0.245 5.715 6.223
E
H
c
D
E
H
e
.050 BSC
0.016
0.004 0.01 0.102 0.254
1.27 BSC
h
0.406
h x 45°
Q
D
A
c
Q
b
e
Ordering Information
Part/Order Number
Marking
Package
Temperature
MK3235-02S
MK3235-02S
MK3235-02S
16 pin SOIC
16 pin SOIC
0-70°C
0-70°C
MK3235-02STR
While the information presented herein has been checked for both accuracy and reliability, ICS assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This
product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high
reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to
change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical
medical instruments.
MDS 3235 E
4
Revision 010302
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com
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