mk1491-06 Integrated Device Technology, mk1491-06 Datasheet - Page 5

• Manufacturer Part Number: mk1491-06
• Description: Cs5530 Geode? Clock Source
• Manufacturer: Integrated Device Technology

MDS 1491-06 J
External Components
The MK1491-06 requires some inexpensive external
components for proper operation. Decoupling
capacitors of 0.1µF should be connected on each VDD
pin to ground, as close to the MK1491-06 as possible.
A series termination resistor of 33Ω may be used for
each clock output. See the discussion below for other
external resistors required for proper I/O operation. The
14.3 MHz oscillator has internal caps that provide the
proper load for a parallel resonant crystal with CL=18
pF. For tuning with other values of C
2*(C
be connected between X1 and ground and X2 and
ground.
Integrated Circuit Systems, Inc.
L
-18) gives the value of each capacitor that should
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525 Race Street, San Jose, CA 95126
L
, the formula
5
I/O Structure
The MK1491-06 provides more functionality in a 28-pin
package by using a unique I/O technique. The device
checks the status of all I/O pins during power-up and at
exit from the Power Down state. This status (pulled
high, low, or mid-level) then determines the frequency
selections and power down modes (see the tables on
pages 2 and 4). Within 10ms after power up, the inputs
change to outputs and the clocks start up. In the
diagrams to the right, the 33Ω resistors are the normal
output termination resistors. The 10kΩ resistor pulls
low to generate a logic zero. Weak internal pull-up
resistors are present on SEL24, EPCI#, FS, LE#,
PCISTP#, and SLOW#. These pins should be
connected directly to VDD or GND if not under active
control. Internal resistors on PEN, SEL AUDIO, and TS
pull to a mid-level (M).
*Note: Do not use a TTL load. This will overcome the
10 kΩ pull-down and force the input to a logic 1.
For select
= 0 (low)
●
I/O
10 k
tel [phone]
AMD Geode™ Clock Source
Do not stuff for
33
“1” selection
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www.icst.com
Revision 110204
To load*
MK1491-06