MK3235-01SLF [IDT]
Clock Generator, 14.3MHz, PDSO16, SOIC-16;型号: | MK3235-01SLF |
厂家: | INTEGRATED DEVICE TECHNOLOGY |
描述: | Clock Generator, 14.3MHz, PDSO16, SOIC-16 时钟 光电二极管 外围集成电路 晶体 |
文件: | 总4页 (文件大小:67K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MK3235
Handheld System Clock Synthesizer
ICR O CLOC K
Description
Features
• Input crystal frequency of 32.768 kHz
• Lowest power solution available
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 clocks.
• Lowest profile clock solution where height is critical
• Three output clocks
• 3.3V or 5.0V operation
• Duty cycle of 45/55
The device has three power down modes for the
14.3MHz, communications, and 32.768kHz clocks.
• 14.3MHz or 14.3MHz+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 MK3235 can save board space and cost even if it
only replaces the 32kHz 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
PD14
Output
Buffer
Clock Synthesis
and Control
Circuitry
14.3 MHz
PDCOMM
PD
Communications
Clock Synthesis
and Control
Output
Buffer
1.843 or
3.686 MHz
VDD32
Circuitry
32.768 kHz
crystal
X1
Crystal
Oscillator
Output
Buffer
32.768 kHz
X2
MDS 3235 D
1
Revision 092397
Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
MK3235
Handheld System Clock Synthesizer
ICR O CLOC K
Pin Assignment
1
16 GND
X2
15
14
13
12
11
10
9
X1
VDD32
VDD
2
3
GND
VDD
4
5
PD14
GND
14.3M
GND
6
7
COMMCLK
32K
PD
8
GND
PDCOMM
Pin Descriptions
Number
Name
Type Description
1
2
X2
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 (1.84 on -01 version, or 3.68MHz on -02 version) 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
33Wmay 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 MicroClock for a recommended external circuit schematic.
MDS 3235 D
2
Revision 092397
Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
MK3235
Handheld System Clock Synthesizer
ICR O CLOC K
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply Voltage, VDD
Referenced to GND
7
VDD+0.5
70
V
V
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage Temperature
Referenced to GND
Max of 30 seconds
-0.5
0
°C
°C
°C
260
-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
Output Low Voltage, VOL
IOH=-4mA
VDD-0.4
2.4
V
VDD=5V, IOH=-25mA
VDD=5V, IOL=25mA
VDD=3.3V
V
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
Output Low Voltage, VOL
VDD=3.3V, IOH=-8mA
VDD=3.3V, IOL=8mA
No Load
V
V
IDD Operating Supply Current, 5V
IDD32 with only 32 kHz running, 5V
IDD Operating Supply Current, 3.3V
9
3.5
6
mA
µA
mA
µA
µA
mA
mA
pF
No Load
No Load
IDD32 with only 32 kHz output running, 3.3V No Load
2.5
1
IDD32, only 32 kHz osc. running, 3.3V, note 2
Short Circuit Current, 5V
32kHz output off. PD=0
32kHz output
±30
±80
7
Short Circuit Current, 5V
14, 1.8MHz outputs
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
14.318 MHz
%
Absolute Clock Period Jitter
-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
500
15
1000
32.768kHz oscillator running
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 D
3
Revision 092397
Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
MK3235
Handheld System Clock Synthesizer
ICR O CLOC K
Package Outline and Package Dimensions
16 pin SOIC narrow
Inches
Millimeters
Min Max
0.055 0.068 1.397 1.7272
Symbol Min
Max
A
b
0.013 0.019 0.330
0.007 0.010 0.191
0.483
0.254
E
H
c
D
E
H
e
0.385 0.400 9.779 10.160
0.150 0.160 3.810
0.225 0.245 5.715
4.064
6.223
.050 BSC
0.016
0.01
1.27 BSC
h
0.406
0.254
h x 45°
Q
0.004
0.102
D
A
c
Q
b
e
Ordering Information
Part/Order Number
Marking
Communications Clock
Package
Temperature
MK3235-01S
MK3235-02S
MK3235-01S
MK3235-02S
MK3235-01S
MK3235-02S
1.843 MHz
3.686 MHz
1.843 MHz
3.686 MHz
16 pin SOIC
16 pin SOIC
0-70°C
0-70°C
0-70°C
0-70°C
MK3235-01STR
MK3235-02STR
Add Tape & Reel
Add Tape & Reel
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated 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 MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not
authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
MDS 3235 D
4
Revision 092397
Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
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