MK3233-01STR Просмотр технического описания (PDF) - Integrated Circuit Systems
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MK3233-01STR Datasheet PDF : 4 Pages
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MK3233
I C R O C LOC K Handheld System Clock Synthesizer
Pin Assignment
CPUS2 1
X2 2
X1 3
VDD32 4
VDD 5
GND 6
COMMCLK 7
32K 8
16 CPUS1
15 CPUS0
14 CPUCLK
13 VDD
12 GND
11 PD
10 PDCPU
9 PDCOMM
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
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 0.1µF 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
33Ω 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 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
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