ICS307G-03T Datasheet ICS307G-03, ICS307G-03T | P7-P9

ICS307-03

SERIALLY PROGRAMMABLE CLOCK SOURCE SER PROG CLOCK SYNTHESIZER

IDT™ / ICS™

SERIALLY PROGRAMMABLE CLOCK SOURCE 7

ICS307-03 REV H 071708

Table 8. Miscellaneous Control Bits

External Components

The ICS307-03 requires a minimum number of external components for proper operation.

Decoupling Capacitors

TheICS307-03 requires 0.01µF decoupling capacitors to be connected between each VDD pin and the Ground Plane. The

0.01µF capacitors must be placed as close to the ICS307-03’s power pins as possible to minimize lead inductance.

Output Termination

The ICS307-03 has advanced output pads that allows the device to achieve very high speed (270 MHz) operation with single

ended clock outputs. The clock outputs on the ICS307-03 are designed to be directly connected to a 50 Ohm transmission

line without the need for any series resistors.

Crystal Selection

A parallel resonant, fundamental mode crystal with a load

(correlation) capacitance of 12 pF should be used. For

crystals with a specified load capacitance greater than 12

pF, additional crystal capacitors may be connected from

each of the pins X1 and X2 to ground as shown in the Block

Diagram on page 1. The value (in pF) of these crystal caps

should be = (C

-12)*2, where C

is the crystal load

capacitance in pF.

For a single ended clock input, connect it to X1 and leave X2 unconnected with no capacitors on either pin.

Initial Output Frequency

ICS307-03 on-chip registers are initially configured to

provide a 1x output clock on the CLK1 output, and 0.5x clock

on CLK2 and CLK3. The output frequency will be the same

as the input clock or crystal for input frequencies from 10 -

50 MHz. This is useful when the ICS307-03 needs to

provide an initial system clock at power-up.

Bit Function

24~88 Reserved—set to 0

110 OE1—set to 1 to enable CLK1

111 OE2—set to 1 to enable CLK2

112 1 = Normal Operation, 0 = power down feedback counter, charge pump and VCO

122 Crystal Input = 1, Clock Input = 0

123 Selects source for CLK2 (see block diagram)

124 Selects source for CLK3 (see block diagram)

125 Reserved—set to 0

126 Reserved—set to 0

129 OE3—set to 1 to enable CLK3

130 Reserved—set to 0

131 Reserved—set to 0

ICS307-03

SERIALLY PROGRAMMABLE CLOCK SOURCE SER PROG CLOCK SYNTHESIZER

IDT™ / ICS™

SERIALLY PROGRAMMABLE CLOCK SOURCE 8

ICS307-03 REV H 071708

Determining and Controlling the Output Frequency with VersaClock

The ICS307-03 is directly supported by the IDT provided

software called VersaClock II. Complete programming

words for this device can be calculated on any Windows PC

by running the VersaClock II software and simple inputting

desired input and output frequencies. Once the software

generates an appropriate programming word, it may then be

either copied to the Windows clipboard or even directly

programmed into the ICS307-03 via the host computers

parallel port.

For more information on VersaClock II, please visit

www.icst.com or send an e-mail to ics-mk@icst.com.

Manually Determining the Output Frequency

The user has full control over the desired output frequency

as long as it is operated within the limits shown in the AC

Electrical Characteristics.

The output of the ICS307-03 can be determined by the

following equation:

Where:

VCO Divider (V) = 12 to 2055

Reference Divider Word (R) = 1 to 2055

Output Divider = values in tables 5, 6, 7

Also, the following operating ranges should be observed.

To determine the best combination of VCO, reference, and

output dividers, please use the VersaClock II software

mentioned above.

Default Register Values

At power-up, the registers are set to:

ref divide = 5

VCO divide = 50

output divide = 10 (CLK1)

output divide = 2 (CLK2)

output divide = 2 (CLK3)

bit 123, 124 = 1

ICP = 3.75 µA

R = 16k

Default programming word is:

0x31FFDFFEE3BFFFFFFFFFFFFFFFF055FF2

LK1Frequency InputFrequency

⋅

------------------

⋅=

COmin InputFrequency

---- VCOmaxfre

<⋅<

20kHz

Input Frequency

-------------------------------------------100MHz<<

ICS307-03

SERIALLY PROGRAMMABLE CLOCK SOURCE SER PROG CLOCK SYNTHESIZER

IDT™ / ICS™

SERIALLY PROGRAMMABLE CLOCK SOURCE 9

ICS307-03 REV H 071708

Programming Interface

The dynamic register within the ICS307-03 controls the entire device and may be reprogrammed any time after

power is properly applied. If V or R values are changed, the frequency will transition smoothly to the new value

without glitches or short cycles. However, changing any divider or mux in the output signal path may generate a

glitch.

The register is 132 bits in length and accepts the MSB first. The SCLK signal latches the current data bit value in

the rising edge. It latches the most recently shifted 132 bit values into the control register of device whenever CS is

high. Care must be taken to ensure that CS is always low until the system is ready to load in a new register value

and that SCLK is never toggled high when CS is high.

The register can be programmed any time after power is applied, even while in power-down (pin 15 or bit 112 held

low) with the waveform and timing shown below:.

Figure 2: ICS307-03 Programming Timing Diagram

Table 8: AC Parameters for Programming the ICS307-03

Programming with VersaClock Software

The VersaClock II Software not only generates the programming word for the user, it can also be used to program the device

via the host computer’s parallel port. Demonstration boards are available from IDT that allows the VersaClock II S/W to

directly connect the ICS307-03 to a Windows based PC’s DB-25 parallel port connector and programmed simply by pressing

the “Program Part” button.

Parameter Condition Min. Max. Units

SETUP

Setup time 2.5 ns

HOLD

Hold time after SCLK 2.5 ns

Data wait time 2.5 ns

Strobe pulse width 10 ns

SCLK Frequency 200 MHz

128129130131 10

hold

setup

SCLK

DIN

P1-P3 P4-P6 P7-P9 P10-P12 P13-P13

ICS307G-03T

Mfr. #:

Buy ICS307G-03T

Manufacturer:

Description:

IC SRL PROGR CLK SOURCE 16-TSSOP

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

ICS307G-03T

ICS307G-03T

Products related to this Datasheet