MK3235-02S Ver la hoja de datos (PDF) - Integrated Circuit Systems
Número de pieza
componentes Descripción
Fabricante
MK3235-02S Datasheet PDF : 4 Pages
| |||
MK3235
I C R O C LOC K Handheld System Clock Synthesizer
Pin Assignment
X2 1
X1 2
VDD32 3
VDD 4
GND 5
COMMCLK 6
32K 7
PDCOMM 8
16 GND
15 GND
14 VDD
13 PD14
12 GND
11 14.3M
10 PD
9 GND
Pin Descriptions
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
X2
X1
VDD32
VDD
GND
COMMCLK
32K
PDCOMM
GND
PD
14.3M
GND
PD14
VDD
GND
GND
Type
O
I
P
P
P
O
O
I
P
I
O
P
I
P
P
P
Description
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 14.
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 and 14.3M clock outputs (stop low) when low.
Connect to ground.
Powers Down everything but 32kHz oscillator internally. 32kHz output buffer is off.
14.318 MHz output clock.
Connect to ground.
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.
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
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 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
Share Link: 