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I C R O C LOC K
Description
The MK3233 is the smallest size, lowest power system clock synthesizer available. It is the ideal way to generate clocks for smart cell phones, 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 32.768 kHz, CPU, and serial communications output clocks. The device has multiple power down modes for the CPU, communications, and 32.768 kHz clocks. The MK3233 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, the upgradeability of CPU frequencies, and the power down capability are added benefits in using the part.
MK3233 Handheld System Clock Synthesizer
Features
* Input crystal frequency of 32.768 kHz * Lowest power solution available * Operating temperature of -20 to 70 C * Output clock frequencies up to 50 MHz * Three output clocks * 3.3 V or 5.0 V operation * Duty cycle of 45/55 * Eight selectable CPU frequencies * CPU or Communication clock power down * Separate battery supply pin for 32 kHz runs to 2V * IDD less than 4A when 32 kHz running * Serial port clocks of 1.8432 MHz (-01 version) or 3.6864 MHz (-02 version) * Packaged in 16 pin narrow SOIC
Block Diagram
VDD GND
CPUS0 CPUS1 CPUS2 PDCPU
CPU Clock Synthesis and Control Circuitry
Output Buffer
CPUCLK
PDCOMM PD VDD32 32.768 kHz crystal X1 or clock
X2
Communications Clock Synthesis and Control Circuitry
Output Buffer
1.843 or 3.686 MHz
Crystal Oscillator
Output Buffer
32.768 kHz
MDS 3233 F
1
Revision 11070
Printed 11/16/00
Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408) 295-9800 tel * www.icst.com
I C R O C LOC K
Pin Assignment
CPUS2 X2 X1 VDD32 VDD GND COMMCLK 32K 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CPUS1 CPUS0 CPUCLK VDD GND PD PDCPU
MK3233 Handheld System Clock Synthesizer
CPU Clock Decoding
CPUS2 CPUS1 CPUS0 CPUCLK (MHz) 0 0 0 8.00 0 0 1 13.00 0 1 0 16.00 0 1 1 20.00 1 0 0 40.00 1 0 1 25.00 1 1 0 50.00 1 1 1 33.33
PDCOMM
Frequency transitions will occur smoothly.
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 COMMCLK 32K PDCOMM PDCPU PD GND VDD CPUCLK CPUS0 CPUS1 Type I O I P P P O O I I I 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 32.768 kHz clock. Will operate to 2.0 V. Connect to +3.3 V or +5 V. Must be the same voltage as pin 13. Connect to ground. Serial communications (1.84 on -01 version, or 3.68MHz on -02 version) clock output. 32.768 kHz square wave clock output. Power Down serial Communications clock output (stops low) when low. Power Down CPU clock output (stops low) when low. Powers Down everything but 32 kHz oscillator internally. 32 kHz output buffer is off. Connect to ground. Connect to +3.3 V or +5 V. 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 MK3233 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 MK3233 as possible. A series resistor should be used on the VDD32 supply. A series termination resistor of 33 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 20pF5% (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 3233 F
2
Revision 11070
Printed 11/16/00
Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408) 295-9800 tel * 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 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, 5 V IDD32 with only 32 kHz running, 5 V IDD Operating Supply Current, 3.3 V IDD32 with only 32 kHz output running, 3.3 V IDD32, only 32 kHz osc. running, 3.3 V, note 2 Short Circuit Current, 5 V Short Circuit Current, 5 V Input Capacitance Input Frequency Output Clock Rise and Fall Time, 0.2 to 0.8VDD Output Clock Duty Cycle, all MHz clocks 32.768 kHz Clock Duty Cycle Absolute Clock Period Jitter, CPU clock Power up time, CPU off to 50 MHz, 32k running Transition time, 8 MHz to 50 MHz Transition time, 50 MHz to 8 MHz Power on time,VDD32=0 V to all clocks stable Power on time, all power down pins taken high
MK3233 Handheld 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 11 3.5 6.5 2.5 1 30 100 7 32.768 Units V V C C C V V V V V V V V V V mA A mA A A mA mA pF kHz ns % % ps ms ms ms ms ms
Conditions Referenced to GND Referenced to GND Max of 10 seconds
ABSOLUTE MAXIMUM RATINGS (note 1)
-0.5 -20 -65 3.0 2.0 2.0
DC CHARACTERISTICS (at 5.0 V unless otherwise noted)
VDD=5 V VDD=5 V VDD=5 V, IOH=-25mA VDD=5 V, IOL=25mA VDD=3.3 V VDD=3.3 V VDD=3.3 V, IOH=-8mA VDD=3.3 V, IOL=8mA No Load, 50MHz No Load No Load, 50MHz No Load 32kHz output off. PD=0 32 kHz output CPU output
AC CHARACTERISTICS (at 5.0 V unless otherwise noted)
2 55 500 9 4 2.5 500 15
At VDD/2 45 At VDD32/2 20 to 50 MHz -500 VDD=3.3 or 5 V VDD=3.3 or 5 V VDD=3.3 or 5 V 32.768kHz crystal with ESR 25k 32.768kHz oscillator running
49 to 51 57
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 1A.
MDS 3233 F
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Revision 11070
Printed 11/16/00
Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408) 295-9800 tel * www.icst.com
I C R O C LOC K
MK3233 Handheld System Clock Synthesizer
Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.)
16 pin SOIC narrow
Symbol A Inches Min Max 0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.0075 0.0098 0.3859 0.3937 0.1497 0.1574 .050 BSC 0.2284 0.2440 0.0099 0.0195 0.0160 0.0500 Millimeters Min Max 1.35 1.75 0.10 0.24 0.33 0.51 0.19 0.24 9.80 10.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.41 1.27
E
INDEX AREA
H
A1
B
C
D A1 e C
h x 45 A L
D E e H h L
B
Ordering Information
Part/Order Number MK3233-01S MK3233-02S MK3233-01STR MK3233-02STR Marking MK3233-01S MK3233-02S MK3233-01S MK3233-02S Communications Clock 1.843 MHz 3.686 MHz 1.843 MHz 3.686 MHz Package 16 pin SOIC 16 pin SOIC Add Tape & Reel Add Tape & Reel Temperature -20 to 70 C -20 to 70 C -20 to 70 C -20 to 70 C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (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 3233 F
4
Revision 11070
Printed 11/16/00
Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408) 295-9800 tel * www.icst.com

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