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I C R O C LOC K
Description
The MK3230 is the smallest size, lowest power system clock synthesizer available. It is the ideal way to generate clocks for portable computers, PDAs, 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, system, keyboard controller, and floppy (or super I/O) controller output clocks. The device has two power down modes. From the CPU decoding table (when FS0, FS1, and FS2 all are low), the CPU and 14.3 MHz system clocks can be turned off. Also, the keyboard and 24 MHz peripheral clocks can be shut off from PD24+KBD (pin 10). The part has a separate VDD32 pin for the 32 kHz clock, allowing it to run at a different voltage (down to 2.0V) from the rest of the chip, allowing it to run from a back-up battery.
MK3230 Portable System Clock Synthesizer
Features
* Packaged in 16 pin narrow (0.150") SOIC * Input crystal frequency of 32.768 kHz * Lowest power solution available * Lowest profile clock solution where height is critical * Output clock frequencies up to 80 MHz * Five output clocks * 3.3V or 5.0V operation * Duty cycle of 45/55 * Seven selectable CPU frequencies * CPU and peripheral clock power downs * Separate battery supply pin for 32 kHz * IDD less than 5A when 32 kHz running * Available with either 12MHz (-01) or 16MHz (-02) keyboard clock output * 14.3MHz output is not suitable for driving PLL for CRT. Will drive all other functions * 32kHz crystals require long startup (>500ms)
Block Diagram
VDD GND
CPUS0 CPUS1 CPUS2 Clock Synthesis and Control Circuitry
Output Buffer Output Buffer Output Buffer Output Buffer
CPUCLK
12 or 16 MHz
PD24+KBD
24.00 MHz 14.32 MHz
VDD32
X1
Crystal Oscillator
X2
Output Buffer
32.768 kHz
32.768 kHz crystal
MDS 3230 F
1 Revision 022798 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
I C R O C LOC K
Pin Assignment
CPUS2 X2 X1 VDD32 VDD GND 24M 32K 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CPUS1 CPUS0 CPUCLK VDD GND 14.3M PD24+KBD KBOUT
MK3230 Portable System Clock Synthesizer
CPU Clock Decoding
CPUS2 CPUS1 CPUS0 CPUCLK (MHz) 0 0 0 Off+14M off 0 0 1 80.00 0 1 0 25.00 0 1 1 66.66 1 0 0 20.00 1 0 1 50.00 1 1 0 33.33 1 1 1 4.00
Frequency transitions (except going to/from off) will occur smoothly, and are compatible with all 486 processors.
Pin Descriptions
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name CPUS2 X2 X1 VDD32 VDD GND 24M 32K KBOUT PD24+KBD 14.3M GND VDD CPUCLK CPUS0 CPUS1 Type I O I P P P O O O I O P P O I I Description Select 2 for CPUCLK frequencies. See Table above. Crystal connection. Connect to 32.768 kHz crystal. 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. 24 MHz floppy (or super I/O) clock output. 32.768 kHz square wave clock output. Keyboard clock output. Either 12MHz (-01) or 16MHz (-02) Power Down 24M+keyboard. Shuts off both clock outputs (pins 7,9) when low. 14.318 MHz system clock output. Do not drive a CRT PLL device with this output. Connect to ground. Connect to +3.3V or +5V. Must be the same voltage as pin 5. CPUCLK output. See Table above. Select 0 for CPUCLK frequencies. See Table above. Select 1 for CPUCLK frequencies. See Table above.
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 MK3230 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.1F should be connected between VDD and GND, and VDD32 and GND, as close to the MK3230 as possible. A 10k series resistor should be used to filter the VDD32 pin. A series termination resistor of 33 may be used for each clock output. The device does not require (nor do we recommend) capacitors connected to the crystal pins. The 32.768 kHz crystal must be connected as close to the chip as possible. See Application Brief MAB02 for a discussion on tuning for use on a real time clock (RTC).
MDS 3230 F
2 Revision 022798 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
I C R O C LOC K
Electrical Specifications
Parameter Supply Voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage Temperature Conditions
MK3230 Portable System Clock Synthesizer
Minimum Typical Maximum 7 VDD+0.5 70 260 150 5.5 5.5 0.8 2.4 0.4 1.9 0.4 2.4 0.4 25 3.5 15 2.5 30 100 7 15 Units V V C C C V V V V V V V V V V mA A mA A mA mA pF pF
ABSOLUTE MAXIMUM RATINGS (note 1)
Referenced to GND Referenced to GND Max of 30 seconds -65 3.0 2.0 2.0 -0.5 0
DC CHARACTERISTICS
Operating Voltage, VDD Operating Voltage,VDD32 Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output Low Voltage, VOL Input High Voltage, VIH Input Low Voltage, VIL 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 IDD32 with only 32 kHz running, 3.3V Short Circuit Current, 5V Short Circuit Current, 5V Input Capacitance Internal Crystal Capacitance
VDD=5V VDD=5V VDD=5V, IOH=-25mA VDD=5V, IOL=25mA VDD=3.3V VDD=3.3V VDD=3.3V, IOH=-8mA VDD=3.3V, IOL=8mA No Load, 80MHz No Load No Load, 80MHz No Load 32 kHz output Each MHz output Pins 2, 3 only
AC CHARACTERISTICS
Input Frequency 32.768 kHz Output Clock Rise and Fall Time, 0.2 to 0.8VDD 2 ns Output Clock Duty Cycle, all MHz clocks At VDD/2 45 49 to 51 55 % 32.768 kHz Clock Duty Cycle At VDD32/2 57 % Absolute Clock Period Jitter, CPU clock 25 to 80 MHz -500 500 ps Power up time, CPU off to 80 MHz, 32k running VDD=3.3 or 5V 9 ms Transition time, 4 MHz to 80 MHz VDD=3.3 or 5V 4 ms Transition time, 80 MHz to 4 MHz VDD=3.3 or 5V 2.5 ms Power on time,VDD32=0V to all clocks stable 32.768kHz crystal with ESR 25k 500 750 ms 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 on the 14.32 MHz output : The actual output frequency from this clock is 14.3196 MHz, versus 14.31818 MHz that has been traditional. This output can be used as the input to digital chips providing functions such as timing or keyboard, but it should NOT be used to drive a graphics PLL that is used for a CRT display. Instead, use a 14.318MHz crystal as the input to the CRT graphics device.
MDS 3230 F
3 Revision 022798 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
I C R O C LOC K
Input and Output Voltages
MK3230 Portable System Clock Synthesizer
The MK3230 can operate with VDD = 3.0V to 5.5V, and VDD32 = 2.0V to 5.5V in any combination. Both VDD pins (pin #5 and pin #13) must be connected to the same voltage. The amplitude of the 32.768 kHz output clock will be equal to VDD32, and the amplitude of the MHz clocks will be equal to VDD. If using a clock input, the input voltage applied to X1 may not exceed VDD32, and the amplitude of any other input may not exceed VDD. Consult MicroClock if your application is an exception to this.
Package Outline and Package Dimensions
16 pin SOIC narrow
Symbol A b c D E H e h Q Inches Min Max 0.055 0.070 0.013 0.019 0.007 0.010 0.385 0.400 0.150 0.160 0.225 0.245 .050 BSC 0.016 0.004 0.01 Millimeters Min Max 1.397 1.778 0.330 0.483 0.191 0.254 9.779 10.160 3.810 4.064 5.715 6.223 1.27 BSC 0.406 0.102 0.254
E
H
D Q e Ordering Information
Part/Order Number MK3230-01S MK3230-02S MK3230-01STR MK3230-02STR
h x 45 A
c b
Marking MK3230-01S MK3230-02S MK3230-01S MK3230-02S
Keyboard frequency 12 MHz 16 MHz 12 MHz 16 MHz
Package 16 pin SOIC 16 pin SOIC Add Tape & Reel Add Tape & Reel
Temperature 0-70C 0-70C 0-70C 0-70C
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 3230 F
4 Revision 022798 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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