ICS84021 Datasheet | Integrated Circuit Systems

Integrated Circuit Systems, Inc. 260MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER Features - 2 LVCMOS/LVTTL outputs - Selectable crystal oscillator interface or LVCMOS/LVTTL TEST_CLK - Output frequency range: 103.3MHz to 260MHz - Crystal input frequency range: 14MHz to 40MHz - VCO range: 620MHz to 780MHz - Parallel or serial interface for programming counter and output dividers - RMS period jitter: 4.3ps (typical) (N ÷ 4, VDDO = 3.3V ± 5%) - RMS phase jitter at 155.52MHz, using a 38.88MHz crystal (12KHz to 20MHz): 2.88ps (typical) Phase noise: 155.52MHz Offset Noise Power 100Hz ................. -93.7 d Bc/Hz 1KHz ............... -111.3 d Bc/Hz 10KHz ............... -120.4 d Bc/Hz 100KHz ............... -125.1 d Bc/Hz - Full 3.3V or mixed 3.3V core/2.5V or 1.8V supply voltage - 0°C to 70°C ambient operating temperature - Industrial temperature information available upon request GENERAL DESCRIPTION The ICS84021 is a general purpose, Crystal-to LVCMOS/LVTTL High Frequency Synthesizer Hi Per Clock S™ and a member of the Hi Per Clock S™ family of High Performance Clock Solutions from ICS. The ICS84021 has a selectable TEST_CLK or crystal input. The VCO operates at a frequency range of 620MHz to 780MHz. The VCO frequency is programmed in steps equal to the value of the input reference or crystal frequency. The VCO and output frequency can be programmed using .. the serial or parallel interface to the configuration logic. The low phase noise characteristics of the ICS84021 make it an ideal clock source for Gigabit Ethernet, SONET, Fibre Channel 1 and 2, and Infiniband applications. BLOCK DIAGRAM OE0 OE1 VCO_SEL PIN ASSIGNMENT VCO_SEL n P_LOAD XTAL1 M4 M3 M2 M1 M0 32 31 30 29 28 27 26 25 XTAL_SEL TEST_CLK XTAL1 OSC XTAL2 1 0 M5 M6 M7 M8 N0 N1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VCO ÷M 0 1 ÷3 ÷4 ÷5 ÷6 TEST VDD OE1 OE0 VDDO Q1 Q0 GND 24 23 22 XTAL2 TEST_CLK XTAL_SEL VDDA S_LOAD S_DATA S_CLOCK MR 21 20 19 18 17 PHASE...