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ICS309RT Datasheet(PDF) 3 Page - Integrated Circuit Systems |
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ICS309RT Datasheet(HTML) 3 Page - Integrated Circuit Systems |
3 / 8 page SERIAL PROGRAMMABLE TRIPLE PLL SS VERSACLOCK SYNTHESIZER MDS 309 G 3 Revision 122704 In te gr ated Circuit Systems ● 525 Ra ce Street, San Jose, CA 9512 6 ● tel (4 08) 297 -1 201 ● www.icst.com ICS309 Configuring the ICS309 Initial State: The ICS309 may be configured to have up to 9 frequency outputs, utilizing the 4 on-board PLLs and spread spectrum circuitry. Unprogrammed, the part has the following outputs, related to the reference input clock: The STROBE pin must have an external 250 kOhm pull-up resistor to acheive the Initial State. The input crystal range for the ICS309 is 5 MHz to 27 MHz. The ICS309 can be programmed to set the output functions and frequencies. 160 data bits generated by the VersaClockTM software are written in DATA pin in this order: MSB (left most bit) first. As show in Figure 2, after these 160 bits are clocked into the ICS309, taking STROBE high will send this data to the internal latch and the CLK output will lock within 10 ms. Note: STROBE utilizes a transparent latch that is latched when in the high state. If STROBE is in the high state and SCLK is pulsed, DATA is clocked directly to the internal latch and the output conditions will change accordingly. Although this will not damage the ICS309, it is recommended that STROBE be kept low while DATA is being clocked into the ICS309 in order to avoid unintended changes on the output clocks. All outputs may be turned off during initialization by bringing the PDTS pin to Ground. When PDTS is brought high, after the Strobe pin in brought high, the programmed output frequencies will be available. AC Parameters for Writing to the ICS309 Default Outputs Output Frequency Clocks 1 - 9 (Pins 4, 7-14) Reference Output Parameter Condition Min. Max. Units tSETUP Setup time 10 ns tHOLD Hold time after SCLK 10 ns tW Data wait time 10 ns tS Strobe pulse width 40 ns SCLK Frequency 30 MHz DATA t hold t setup SCLK STROBE t s t w Figure 2. Tim ing D iagram for Program m ing the IC S309 Bit160 Bit2 Bit1 Bit3 Bit159 Bit158 |
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Similar Description - ICS309RT |
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