MK3234-01S [ICSI]
Portable System Clock Synthesizer; 便携式系统时钟合成器
| 型号： | MK3234-01S |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Portable System Clock Synthesizer |
| 文件： | 总4页 (文件大小：71K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK3234
Portable System Clock Synthesizer
ICR O CLOC K
Description
Features
• Input crystal frequency of 32.768 kHz
• Lowest power solution available
• Lowest profile clock solution where height is critical
• Output clock frequencies up to 50 MHz
• Three output clocks
The MK3234 is the smallest size, lowest power system
clock synthesizer available. It is the ideal way to
generate clocks for portable computers 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, CPU, and ISA bus (system) output
clocks.
• 3.3V or 5.0V operation
The device has an individual power down pin for the
CPU clock, and a power down pin for the entire device.
• Duty cycle of 45/55
• Eight selectable CPU frequencies
• CPU clock power down
The MK3234 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, the
upgradeability of CPU frequencies, and the power
down capability are added benefits in using the part.
• Separate battery supply pin for 32 kHz runs to 2V
• IDD less than 4µA when 32 kHz running
• Packaged in 16 pin narrow (0.150”) SOIC
Block Diagram
VDD GND
CPUS0
CPUS1
CPUS2
CPU
Output
Buffer
Clock Synthesis
and Control
Circuitry
CPUCLK
PDCPU
System
Clock Synthesis
and Control
Circuitry
Output
Buffer
14.318 MHz
32.768 kHz
PD
VDD32
32.768 kHz
crystal
X1
Crystal
Oscillator
Output
Buffer
X2
MDS 3234 C
1
Revision 022798
Printed 11/16/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK3234
Portable System Clock Synthesizer
ICR O CLOC K
Pin Assignment
CPU Clock Decoding
1
CPUS2
16 CPUS1
CPUS2 CPUS1 CPUS0 CPUCLK (MHz)
15
14
13
12
11
10
9
2
3
CPUS0
X2
X1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
8.00
13.00
16.00
20.00
40.00
25.00
50.00
33.33
CPUCLK
VDD32
VDD
GND
4
5
VDD
GND
14.3M
6
7
32K
PD
GND
8
PDCPU
Frequency transitions will occur smoothly.
Pin Descriptions
Number
Name
CPUS2
X2
Type Description
1
2
I
O
I
Select 2 for CPUCLK frequencies. See Table above.
Crystal connection. Connect to 32.768 kHz crystal.
3
X1
Crystal connection. Connect to 32.768 kHz crystal.
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 13.
Connect to ground.
4
VDD32
VDD
P
P
P
O
P
I
5
6
GND
7
32K
32.768 kHz square wave clock output.
8
GND
Connect to ground.
9
PDCPU
PD
Power Down CPU clock output (stops low) when low.
Powers Down everything but 32kHz oscillator internally. 32kHz output buffer is off.
14.318 MHz clock output. Do not use to drive video CRT controller.
Connect to ground.
10
11
12
13
14
15
16
I
14.3M
GND
O
P
P
O
I
VDD
Connect to +3.3V or +5V. Must be the same voltage as pin 5.
CPUCLK output. See Table above.
CPUCLK
CPUS0
CPUS1
Select 0 for CPUCLK frequencies. See Table above.
Select 1 for CPUCLK frequencies. See Table above.
I
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 MK3234 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
MK3234 as possible. A series resistor of 10kWshould 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. The 14.3 MHz output is not suitable for driving CRT displays. A separate
14.318 MHz crystal should be used at the input to the graphics controller chip. Consult MicroClock for a
recommended external circuit schematic.
MDS 3234 C
2
Revision 022798
Printed 11/16/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK3234
Portable 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
0.4
0.4
0.4
V
Output High Voltage, VOH
Output Low Voltage, VOL
Input High Voltage, VIH
VDD=5V, IOH=-25mA
VDD=5V, IOL=25mA
VDD=3.3V
2.4
1.9
2.4
V
V
V
Input Low Voltage, VIL
VDD=3.3V
V
Output High Voltage, VOH
Output Low Voltage, VOL
IDD Operating Supply Current, 5V
IDD32 with only 32 kHz running, 5V
IDD Operating Supply Current, 3.3V
VDD=3.3V, IOH=-8mA
VDD=3.3V, IOL=8mA
No Load, 50MHz
No Load
V
V
15
3.5
9
mA
µA
mA
µA
µA
mA
mA
pF
No Load, 50MHz
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
32 kHz output
CPU output
±30
±100
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
20 to 50 MHz
%
Absolute Clock Period Jitter, CPU clock
-500
500
ps
Power up time, CPU off to 50 MHz, 32k running VDD=3.3 or 5V
9
4
ms
ms
ms
ms
ms
Transition time, 8 MHz to 50 MHz
VDD=3.3 or 5V
VDD=3.3 or 5V
Transition time, 50 MHz to 8 MHz
2.5
500
15
Power on time,VDD32=0V to all clocks stable
Power on time, all power down pins taken high
32.768kHz crystal with ESR £25kW
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 3234 C
3
Revision 022798
Printed 11/16/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK3234
Portable 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
Package
Temperature
MK3234-01S
MK3234-01S
MK3234-01S
16 pin SOIC
0-70°C
0-70°C
MK3234-01STR
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 3234 C
4
Revision 022798
Printed 11/16/00
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
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