MK1491-09FILN IDT, Integrated Device Technology Inc, MK1491-09FILN Datasheet - Page 4
![no-image](/images/manufacturer_photos/0/3/324/idt__integrated_device_technology_inc_sml.jpg)
MK1491-09FILN
Manufacturer Part Number
MK1491-09FILN
Description
IC CLK SRC AMD GEODE GX2 28-SSOP
Manufacturer
IDT, Integrated Device Technology Inc
Type
Clock Synthesizerr
Series
-r
Specifications of MK1491-09FILN
Input
Crystal
Output
LVCMOS
Frequency - Max
66MHz
Voltage - Supply
3.15 V ~ 3.45 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-SSOP
Frequency-max
66MHz
Number Of Elements
1
Supply Current
60mA
Pll Input Freq (min)
14.31818MHz
Operating Supply Voltage (typ)
3.3V
Operating Temp Range
-40C to 85C
Package Type
SSOP
Output Frequency Range
33 to 66MHz
Operating Supply Voltage (min)
3.13V
Operating Supply Voltage (max)
3.46V
Operating Temperature Classification
Industrial
Pin Count
28
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MK1491-09FILN
Manufacturer:
MAX
Quantity:
32
Power Down Control Table
Power-on Default Conditions
External Components
The MK1491-09 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 MK1491-09 as possible. A series termination
resistor of 33 may be used for each clock output. See the
discussion below for other external resistors required for
proper I/O operation. The 14.318 MHz oscillator has internal
caps that provide the proper load for a parallel resonant
crystal with C
formula 2*(C
should be connected between X1 and ground and X2 and
ground.
IDT™ AMD GEODE™ GX2 CLOCK SOURCE
Pin #
MK1491-09
AMD GEODE™ GX2 CLOCK SOURCE
14
27
10
PD#
0
1
L
L
Function
-18) gives the value of each capacitor that
All clocks are stopped low.
All clocks are running.
Sel66/33#
=18 pF. For tuning with other values of C
Spread#
TS#
Default
Functions
H
H
H
Latched input. All outputs enabled when high. When low, all outputs are in
tristate.
Latched input. Spread disabled when high. When low, spread is enabled
on all outputs except ref clocks and 48 MHz.
This is an active input. When high, it selects PCI=66 MHz outputs; when
low, selects PCI frequency = 33 MHz outputs.
L
, the
4
I/O Structure
The MK1491-09 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. This status
(pulled high or low) then determines the frequency
selections and power down modes (see the tables on pages
2 and 3). Within 10ms after power up, the inputs change to
outputs and the clocks start up. In the diagrams below, the
33 resistors are the normal output termination resistors.
The 10k resistor pulls low to generate a logic zero when
needed. Weak internal pull-up resistors are present on TS#,
Spread#, PD#, and Sel66/33 to pull the pin to high when left
floating.
*Note: Do not use a TTL load. This will overcome the 10 k
pull-down and force the input to a logic 1.
For select
= 0 (low)
Condition
I/O
10 k
Do not stuff for
33
“1” selection
CLOCK SYNTHESIZER
MK1491-09
To load*
REV L 121809