CY2V9950AIT

CY2V9950 2.5/3.3V 200-MHz Multi-Output Zero Delay Buffer Features • • • • • • • • • • • • • • 2.5V or 3.3V operation Split output bank power supplies Output frequency range: 6 MHz to 200 MHz Output-output skew < 150 ps Cycle-cycle jitter < 100 ps Selectable positive or negative edge synchronization Selectable phase-locked loop (PLL) frequency range 8 LVTTL outputs driving 50Ω terminated lines LVCMOS/LVTTL Over-voltage tolerant reference input 2x, 4x multiply and (1/2)x, (1/4)x divide ratios Spread-Spectrum-compatible Pin-compatible with IDT5V9950 and IDT5T9950 Industrial temperature range: –40°C to +85°C 32-pin TQFP package Functional Description The CY2V9950 is a low-voltage, low-power, eight-output, 200-MHz clock driver. It features functions necessary to optimize the timing of high performance computer and communication systems. The user can program the output banks through 3F[0:1] and 4F[0:1]pins. Any one of the outputs can be connected to feedback input to achieve different reference frequency multiplication and divide ratios and zero input-output delay. The device also features split output bank power supplies which enable the user to run two banks (1Qn and 2Qn) at a power supply level different from that of the other two banks (3Qn and 4Qn). Additionally, the PE pin controls the synchronization of the output signals to either the rising or the falling edge of the reference clock. Block Diagram Pin Configuration TEST PE FS VDDQ 1 VSS TEST VDD REF 2F1 3F0 R EF 3 3 PLL FB 32 31 30 29 28 27 26 25 3F1 1Q 0 4F0 4F1 PE VDDQ4 4Q1 4Q0 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VDDQ3 3Q1 VSS VDD 3Q0 2Q1 2Q0 FB FS 2F0 24 23 22 1F1 1F0 sOE# VDDQ1 1Q0 1Q1 VSS VSS 21 20 19 18 17 1F1:0 1Q 1 CY2V9950 2Q 0 2F1:0 2Q 1 3F1:0 3 3 /K 3Q 0 3Q 1 VDDQ 3 4F1:0 3 3 /M 4Q 0 4Q 1 VDDQ 4 sO E# Cypress Semiconductor Corporation Document #: 38-07436 Rev. *A • 3901 North First Street • San Jose, CA 95134 • 408-943-2600 Revised August 11, 2004 CY2V9950 Pin Definitions Pin 29 13 27 22 Name REF FB TEST sOE# I, PD I/O[1] Type I LVTTL/LVCMOS I LVTTL 3-Level I 2-Level Description Reference Clock Input. Feedback Input. When MID or HIGH, disables PLL (except for conditions of note 3). REF goes to all outputs. Set LOW for normal operation. Synchronous Output Enable. When HIGH, it stops clock outputs (except 2Q0 and 2Q1) in a LOW state (for PE = H or M) – 2Q0 and 2Q1 may be used as the feedback signal to maintain phase lock. When TEST is held at MID level and sOE# is high, the nF[1:0] pins act as output disable controls for individual banks when nF[1:0] = LL. Set sOE# LOW for normal operation. Selects Positive or Negative Edge Control and High or Low output drive strength. When LOW / HIGH the outputs are synchronized with the negative/positive edge of the reference clock. Please see Table 5. Select frequency of the outputs. Please see Tables 1 and 2. Selects VCO operating frequency range. Please see Table 4. Four banks of two outputs. Please see Tables 1 and 2 for frequency settings. Power supply for Bank 1 and Bank 2 output buffers. Please see Table 6 for supply level constraints Power supply for Bank 3 output buffers. Please see Table 6 for supply level constraints Power supply for Bank 4 output buffers. Please see Table 6 for supply level constraints Power supply for internal circuitry. Please see Table 6 for supply level constraints Ground. The divider settings, output frequencies, and possible configurations of connecting FB to ANY output are summarized in Table 3. Table 3. Output Frequency Settings Configuration FB to 1Qn, 2Qn 3Qn 4Qn 1Q, 2Q [6] FREF K x FREF M x FREF Output Frequency 3Q (1/K) x FREF FREF (M/K) x FREF 4Q (1/M) x FREF (K/M) x FREF FREF 4 PE I, PU I I O PWR PWR PWR PWR PWR LVTTL 24, 23, 26, 25, 1, 32, 3, 2 31 19, 20, 15, 16,10,11, 6, 7 21 12 5 14,30 8, 9, 17, 18, 28 nF[1:0] FS nQ[1:0] VDDQ1[2] VDDQ3[2] VDDQ4[2] VDD[2] VSS 3-Level 3-Level LVTTL Power Power Power Power Power Device Configuration The outputs of the CY2V9950 can be configured to run at frequencies ranging from 6 to 200 MHz. Banks 3 and 4 output dividers are controlled by 3F[1:0] and 4F[1:0] as indicated in Table 1 and 2 respectively. Table 1. Output Divider Settings – Bank 3 3F[1:0] LL[4] HH Other K – Bank3 Output Divider 2 4 1 Table 2. Output Divider Settings – Bank 4 4F[1:0] LL[4] HH Other M – Bank4 Output Divider 2 Inverted[5] 1 The 3-level FS control pin setting determines the nominal operating frequency range of the divide-by-one outputs of the device. The CY2V9950 PLL operating frequency range that corresponds to each FS level is given in Table 4. Notes: 1. ‘PD’ indicates an internal pull-down and ‘PU’ indicates an internal pull-up. ‘3’ indicates a three-level input buffer. 2. A bypass capacitor (0.1µF) should be placed as close as possible to each positive power pin (