9214DGLFT

ICS9214 Integrated Circuit Systems, Inc. Rambus TM TM XDR Clock Generator General Description Features The ICS9214 clock generator provides the necessary clock TM signals to support the Rambus XDR memory subsystem and Redwood logic interface. The clock source is a reference clock that may or may not be modulated for spread spectrum. The ICS9214 provides 4 differential clock pairs in a space saving 28-pin TSSOP package and provides an off-the-shelf high-performance interface solution. • • Figure 1 shows the major components of the ICS9214 XDR Clock Generator. These include the a PLL, a Bypass Multiplexer and four differential output buffers. The outputs can be disabled by a logic low on the OE pin. An output is enabled by the combination of the OE pin being high, and 1 in its SMBus Output control register bit. • The PLL receives a reference clock, CLK_INT/C and outputs a clock signal at a frequency equal to the input frequency times a multiplier. Table 2 shows the multipliers selectable via the SMBus interface. This clock signal is then fed to the differential output buffers to drive the enabled clocks. Disabled outputs are set to Hi-Z. The Bypass mode routes the input clock, CLK_INT/C, directly to the differential output buffers, bypassing the PLL. • • • • • 400 – 500 MHz clock source 4 open-drain differential output drives with short term jitter < 40ps Spread spectrum compatible Reference clock is differential or single-ended, 100 or 133 MHz SMBus programmability for: - frequency multiplier - output enable - operating mode Supports frequency multipliers of: 3, 4, 5, 6, 8, 9/2, 15/2 and 15/4 Support systems where XDR subsystem is asynchronous to other system clocks 2.5V power supply Up to four ICS9214 devices can be cascaded on the same SMBus. Table 3 shows the SMBus addressing and control for the four devices. Block Diagram OE RegA BYPASS#/PLL CLK_INT CLK_INC SMBCLK Bypass MUX ODCLK_T0 ODCLK_C0 OE RegB ODCLK_T1 ODCLK_C1 PLL OE RegC ODCLK_T2 ODCLK_C2 OE RegD ODCLK_T3 AVDD2.5 AGND IREFY AGND CLK_INT CLK_INC VDD2.5 GND SMBCLK SMBDAT OE SMB_A0 SMB_A1 BYPASS#/PLL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ICS9214 Pin Configuration OE 28 27 26 25 24 23 22 21 20 19 18 17 16 15 ODCLK_C3 28-Pin 4.4mm TSSOP SMBDAT SMB_A0 SMB_A1 0809G–05/02/08 VDD2.5 ODCLK_T0 ODCLK_C0 GND ODCLK_T1 ODCLK_C1 VDD2.5 GND ODCLK_T2 ODCLK_C2 GND ODCLK_T3 ODCLK_C3 VDD2.5 ICS9214 Integrated Circuit Systems, Inc. Pin Descriptions PIN # 1 2 PIN NAME AVDD2.5 AGND PIN TYPE PWR PWR 3 IREFY IN 4 5 6 7 8 9 10 AGND CLK_INT CLK_INC VDD2.5 GND SMBCLK SMBDAT PWR IN IN PWR PWR IN I/O 11 OE IN 12 13 SMB_A0 SMB_A1 IN IN 14 BYPASS#/PLL IN 15 VDD2.5 PWR 16 ODCLK_C3 OUT 17 ODCLK_T3 OUT 18 GND PWR 19 ODCLK_C2 OUT 20 ODCLK_T2 OUT 21 22 GND VDD2.5 PWR PWR 23 ODCLK_C1 OUT 24 ODCLK_T1 OUT 25 GND PWR 26 ODCLK_C0 OUT 27 ODCLK_T0 OUT 28 VDD2.5 PWR DESCRIPTION 2.5V Analog Power pin for Core PLL Analog Ground pin for Core PLL This pin establishes the reference current for the differential clock pairs. This pin requires a fixed precision resistor tied to ground in order to establish the appropriate current. Analog Ground pin for Core PLL "True" reference clock input. "Complementary" reference clock input. Power supply, nominal 2.5V Ground pin. Clock pin of SMBUS circuitry, 5V tolerant Data pin of SMBUS circuitry, 5V tolerant Active high input for enabling outputs. 0 = tri-state outputs, 1= enable outputs SMBus address bit 0 (LSB) SMBus address bit 1 Input to select Bypass(fan-out) or PLL (ZDB) mode 0 = Bypass mode, 1= PLL mode Power supply, nominal 2.5V "Complementary" side of open drain differential clock output. This open drain output needs an external resistor network.. "True" side of open drain differential clock output. This open drain output needs an external resistor network.. Ground pin. "Complementary" side of open drain differential clock output. This open drain output needs an external resistor network.. "True" side of open drain differential clock output. This open drain output needs an external resistor network.. Ground pin. Power supply, nominal 2.5V "Complementary" side of open drain differential clock output. This open drain output needs an external resistor network.. "True" side of open drain differential clock output. This open drain output needs an external resistor network.. Ground pin. "Complementary" side of open drain differential clock output. This open drain output needs an external resistor network.. "True" side of open drain differential clock output. This open drain output needs an external resistor network.. Power supply, nominal 2.5V 0809G—08/02/08 2 ICS9214 Integrated Circuit Systems, Inc. General SMBus serial interface information for the ICS9214 How to Write: How to Read: Controller (host) sends a start bit. Controller (host) sends the write address D8 (H) ICS clock will acknowledge Controller (host) sends the begining byte location = N ICS clock will acknowledge Controller (host) sends the data byte count = X ICS clock will acknowledge Controller (host) starts sending Byte N through Byte N + X -1 • ICS clock will acknowledge each byte one at a time • Controller (host) sends a Stop bit • • • • • • • • • • • • • • • • • • • • • • Index Block Read Operation Index Block Write Operation Controlle r (Host) starT bit T Slave Address D8(H ) WR W Rite Controller (host) will send start bit. Controller (host) sends the write address D8 (H) ICS clock will acknowledge Controller (host) sends the begining byte location = N ICS clock will acknowledge Controller (host) will send a separate start bit. Controller (host) sends the read address D9 (H) ICS clock will acknowledge ICS clock will send the data byte count = X ICS clock sends Byte N + X -1 ICS clock sends Byte 0 through byte X (if X(H) was written to byte 8). Controller (host) will need to acknowledge each byte Controllor (host) will send a not acknowledge bit Controller (host) will send a stop bit Controlle r (Host) T starT bit Slave Address D8(H ) WR W Rite ICS (Sla ve/Re ce ive r) ICS (Sla ve/Re ce ive r) ACK ACK Beginning Byte = N Beginning Byte = N ACK ACK RT Repeat starT Slave Address D9(H ) RD ReaD Data Byte Count = X ACK Beginning Byte N ACK X Byte ACK Data Byte Count = X ACK Beginning Byte N Byte N + X - 1 ACK X Byte ACK P stoP bit Byte N + X - 1 N P 0809G—08/02/08 3 Not acknowledge stoP bit ICS9214 Integrated Circuit Systems, Inc. SMB Table: Output Control Register Byte 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # Name Test Mode MULT2 MULT1 MULT0 ODCLK_T/C0 ODCLK_T/C1 ODCLK_T/C2 ODCLK_T/C3 27,26 24,23 20,19 17,16 Control Function Reserved for Vendor Multiplier Select Multiplier Select Multiplier Select Output Control Output Control Output Control Output Control Type 0 1 PWD1 RW RW RW RW RW RW RW RW Disable Enable Disable Disable Disable Disable Enable Enable Enable Enable 0 0 0 1 1 1 1 1 Type 0 1 PWD RW RW RW RW RW RW RW - - 0 0 0 0 0 0 0 See Table 2. Disable = Output in high-impedance state Enable = Output is switching SMB Table: Reserved Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 - Reserved Reserved Reserved Reserved Reserved Reserved Reserved Control Function Reserved Reserved Reserved Reserved Reserved Reserved Reserved Bit 0 - Reserved Reserved RW - - 0 Control Function Type 0 1 PWD R R R R R R - - X X X X X 0 R - - 0 R - - 1 Byte 1 Pin # Name SMB Table: Revision & Vendor ID Register Byte 2 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Pin # - Bit 1 Bit 0 Name RID4 RID3 RID2 RID1 RID0 VID2 VID1 Revision ID Vendor ID VID0 NOTES: 1. PWD = Power Up Default 0809G—08/02/08 4 ICS9214 Integrated Circuit Systems, Inc. PLL Multiplier Table 2 shows the frequency multipliers in the PLL, selectable by programming the MULT0, MULT1 and MULT2 bits in the SMBus Multiplier Control register. Power up default is 4. Table 2. PLL Multiplier Selection Byte 0 Output Frequency (MHz) Frequency Multiplier CLK_INT/C = 100 MHz 1 CLK_INT/C = 133 MHz 1 3 4 3003 4002 400 533 0 5 500 667 1 6 600 800 0 0 8 800 -3 Bit 6 Bit 5 Bit 4 MULT2 0 0 MULT1 0 0 MULT0 0 1 0 1 0 1 1 1 0 1 9/2 450 600 1 1 0 15/2 750 -3 1 1 1 15/4 375 500 NOTES 1 Output frequencies are based on nominal input frequencies of 100 MHz and 133 MHz. The PLL multipliers are also applicable to spread spectrum modulated input clocks. 2 Default muliplier value at power up 3 Outputs at these settings do not conform to the AC Output Characteristics, or are not supported. 4 Shaded areas are under development and are not yet supported Device ID and SMBus Device Address The device ID (SMB_A(1:0)) is part of the SMBus device address. The least significant bit of the address designates a write or read operation. Table 3 shows the addresses for four ICS9214 devices on the same SMBus. Table 3. SMBus Device Addresses ICS9214 Device Operation Write 0 Read 1 2 3 Hex Address D8 D9 Write DA Read DB Write DC Read DD Write DE Read DF 8-bit SMBus Device Address, Including Oper. SMB_A1 SMB_A0 WR#/RD 0 0 0 1 0 1 1 0 1 1 11011 0809G—08/02/08 5 0 1 0 1 0 1 ICS9214 Integrated Circuit Systems, Inc. Operating Modes Table 4: Operating Modes Bit 1 Bit 0 X X L H H H H H H H H H H H H H H H H Bit 2 L H H H H H H H H H H H H H H H H H H Byte 0 Byte 1 Bit 3 BYPASS#/ PLL Bit 7 OE X 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02 X X X 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 12 X X X 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 12 X X X 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 12 X X X 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 12 ODCLK_T/C3 ODCLK_T/C2 ODCLK_T/C1 ODCLK_T/C0 Z Z Z Z Z Z Z Z Z CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C Z Z Reserved for Vendor Test CLK_INT/C1 Z Z Z Z Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C Z Z Z Z Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C CLK_INT/C Notes 1 Bypass Mode 2 Power up default mode 0809G—08/02/08 6 Z Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C Z CLK_INT/C ICS9214 Integrated Circuit Systems, Inc. Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ambient Operating Temperature . . . . . . . . . . . . Storage Temperature . . . . . . . . . . . . . . . . . . . . . 4.0 V GND –0.5 V to VDD +0.5 V 0°C to +85°C –65°C to +150°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. DC Characteristics - Inputs TA = 0°C to +85°C; Supply Voltage AVDD2.5, VDD2.5 = 2.5 V +/- 0.125V (unless otherwise stated) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VDD2.5, AVDD 2.375 2.625 V 125 mA Supply Current I DD2.5, I VDD High-level input VIHCLK 0.6 0.95 V voltage Low-level input VILCLK -0.15 0.15 V voltage CLK_INT, CLK_INC Crossing point VIXCLK 0.2 0.55 V voltage Difference in crossing point 0.15 V VIXCLK voltage Input threshold 0.35 0.5VDD2.5 V VTH voltage High-level input Singled-ended VIHSE voltage for singleVTH + 0.3 2.625 V ended CLK_IN CLK_IN1 Low-level input voltage for singleVILSE -0.15 VTH - 0.3 V ended CLK_IN High-level input VIH OE, SMB_A0, 1.4 2.625 V voltage SMB_A1, Low-level input VIL BYPASS#/PLL -0.15 0.8 V voltage High-level input VIHSMB 1.4 3.4652 V SMBCLK, voltage - SMBus SMBDAT Low-level input -0.15 0.8 V VILSMB voltage - SMBus Notes: 1 When using singled-ended clock input, VTH is supplied to CLK_INTC as shown in Figure 2. Duty cycle of singled-ended CLK_IN is measured at VTH 2 This range of SMBus input high voltages allows the 9214 to co-exist with 3.3V, 2.5V and 1.8V devices on the same SMBus. 0809G—08/02/08 7 ICS9214 Integrated Circuit Systems, Inc. DC Characteristics - Outputs TA = 0°C to +85°C; Supply Voltage AVDD2.5, VDD2.5 = 2.5 V +/- 0.125V (unless otherwise stated) SYMBOL MIN TYP MAX PARAMETER CONDITIONS Power within spec to tPU 3 Power up latency outputs within spec SMBus or Mode Select 1 tCO 3 transition to outputs valid State transition latency and within spec Measured as shown in Fig. Differential output VOX 0.9 1.1 3 crossing voltage Output Voltage Swing Measured as shown in Fig. VCOS 300 350 (peak-to-peak singled 3. Excludes over and ended) undershoot. Measured at ODCLK_T/C 0.85 Absolute output low voltage VOLABS pins Reference Voltage for VDD = 2.3V, VOUT = 1V VISET 0.98 1.02 swing control current Ratio of output low IREF is equal to VISET/RRC. current to reference IOL/IREF 6.8 7 7.2 Tolerance of RRC