General Purpose Frequency Timing Generator - ICS
Description
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Integrated Circuit Systems, Inc.
ICS951601
Preliminary Product Preview
General Purpose Frequency Timing Generator
Recommended Application: General Purpose Clock Generator Output Features: • 17 - PCI clocks selectable, either 33.
33MHz or 66.
6MHz @ 3.
3V • 1 - 48MHz @ 3.
3V • 1 - REF @ 3.
3V, 14.
318MHz.
Features: • • • Programable Spread spectrum precentage for EMI control Uses external 14.
318MHz crystal Select pins for frequency select
Pin Configuration
REF0 VDD X1 X2 GND SDATA SCLK GNDA VDDA SEL1A PCI1A_0 PCI1A_1 VDD33 GND PCI1A_2 PCI1A_3 GND VDD33 PCI1A_4 PCI1A_5 VDD33 GND PCI1A_6 PCI1A_7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 48MHz GND VDD48 SPREAD VDDA GNDA SEL2B PCI2B_2 PCI2B_1 GND VDD66 PCI2B_0 SEL2A PCI2A_2 PCI2A_1 VDD2A GND PCI2A_0 SEL1B PCI1B_2 PCI1B_1 GND VDD1B PCI1B_0
Key Specifications: • PCI – PCI output skew within same bank @ 33MHz: <170ps • • • • • • PCI – PCI output skew within same bank@ 66MHz: <340ps Cycle to Cycle Jitter PCI @ 33MHz: <200ps Cycle to Cycle Jitter PCI @ 66MHz: <200ps Cycle to Cycle Jitter 48MHz: <350ps Cycle to Cycle Jitter REF: <500ps Slew Rate: 1.
5 - 4 V/ns.
(PCI spec.
)
48-pin SSOP
*120K ohm pull-up to VDD on indicated inputs.
Block Diagram
PLL2 48MHz
X1 X2
XTAL OSC PLL1 Spread Spectrum
PCI DIVDER
REF0
8 PCI1A (7:0)
PCI DIVDER
3 PCI2A (2:0)
SDATA SCLK SELA (2:1) SELB (2:1) SPREAD
Control Logic Config.
Reg.
PCI DIVDER
3 PCI1B (2:0)
PCI DIVDER
3 PCI2B (2:0)
Power Groups:
VDDA = Analog Power GNDA = Analog Ground
0663B—09/04/03
PRODUCT PREVIEW documents contain information on new products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change without notice.
ICS951601
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ICS951601
Preliminary Product Preview
Pin Descriptions
Pin number 1 2, 13, 18, 21, 26, 33, 38, 46 3 4 9, 44 10, 30, 36, 42 5, 14, 17, 22, 27, 32, 39...
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