ICS91720 Integrated Circuit Systems, Inc. Low EMI, Spread Modulating, Clock Generator Features: Pin Configuration • ICS91720 is a Spread Spectrum Clock targeted for 8 PD#* CLKIN 1 Mobile PC and LCD panel applications that generates an EMI-optimized clock signal (EMI peak 7 SCLK VDD 2 reduction of 7-14 dB on 3rd-19th harmonics) through 6 SDATA GND 3 use of Spread Spectrum techniques. 5 REF_OUT/FS_IN1* **CLKOUT/FS_IN0 4 • ICS91720 focuses on the lower input frequency range of 14.318 to 80.00 MHz with a spread 8 Pin SOIC/TSSOP modulation of 20kHz to 40kHz. * Internal Pull-Up Resistor ** Internal Pull-Down Resistor Specifications: • • • • • • • Supply Voltages: VDD = 3.3V ±0.3V Frequency range: 14.318 MHz ≤ Fin ≥ 80 MHz Cyc to Cyc jitter: <150ps Output duty cycle 45-55% Guarantees +85°C operational condition. 8-pin SOIC/TSSOP Reference input Functionality FSIN_1 FSIN_0 MHz 0 0 14.318 MHz in --> 27MHz out 0 1 14.318MHz -->14.318MHz out 1 0 27.00MHz in --> 27.00MHz out 1 1 48.00MHz in -->48.00 MHz out Spread % default -0.8 down spread -1.00 down spread -1.25 down spread -0.8 down spread Block Diagram REFOUT CLKIN PD# PLL1 Spread Spectrum Spectr um Control SDATA SD Logic SCLK Config. FS_IN0:1 0698D—10/05/04 Reg. CLKOUT CLK OUT ICS91720 Pin Description PIN # PIN NAME PIN TYPE PWR IN OUT DESCRIPTION Input for reference clock. Power supply, nominal 3.3V Ground pin. Modulated clock output. 4 **CLKOUT/FS_IN0 I/O Frequency select latch input. Refer to the functionality table. Un-modulated 3.3V reference clock output. 5 REF_OUT/FS_IN1* I/O Frequency select latch input. Refer to the functionality table. 6 SDATA PWR Data pin for I2C circuitry 5V tolerant 7 SCLK PWR Clock pin of I2C circuitry 5V tolerant Asynchronous active low input pin used to power down the device into a low power state. The internal clocks are disabled and the VCO and the 8 PD#* PWR crystal are stopped. The latency of the power down will not be greater than 1.8ms. * Internal Pull-Up Resistor ** Internal Pull-Down Resistor 1 2 3 CLKIN VDD GND 0698D—10/05/04 2 ICS91720 Table 1: Frequency Configuration Table (See I2C Byte 0) FS4 14in/27out 14in/14out 27in/27out 48in/48out 66in/66out FS3 FS2 FS1 FS0 Sprd Type Sprd % 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 0 0 0 1 1 1 1 0 CENTER SPD (+/-) 1 0 0 0 1 1 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 CNTR SPD 0 1 DOWN 0 SPREAD 1 (-) 0 1 0 1 CENTER 0 SPREAD 1 (+/-) 0 1 0 1 DOWN 0 SPREAD 1 (-) 0 1 1 1 1 1 1 1 1 1 0 CENTER SPD (+/-) 1 DOWN SPREAD (-) DOWN SPREAD (-) 0.60 0.80 1.00 1.25 1.50 2.00 0.50 1.00 0.60 1.00 -0.80 +/-0.3 1.50 1.75 2.00 2.50 3.00 -1.25 0.40 0.50 0.70 1.00 1.20 1.50 0.60 0.80 1.00 1.25 1.50 2.00 0.50 1.00 Above is the hard coded 5 bit (32 entry) ROM table. FS2:0 are ONLY accessible through I2C software programming bits (byte0 bits5:7). FS3 and FS4 can also be decoded from FS_IN0:1 latched input hardware pins. FS_IN0 → FS3 and FS_IN1 → FS4. Upon power-up the default is to use hardware selections of FS_IN0:1 latched values. FS2 = 0, FS1 = 0, FS0 = 1 upon power-up (refer to the functionality table on page 1). To access non-default spread entries in the ROM, byte0 programming should be used. In order to change the power up default of FS_IN1:0 = 10 (-1.25% down spread) to any other spread % entry, first change byte0bit 0 to software selection by switching this bit to a ‘1’ and then program the desired percentage by changing byte0 bits 7:3. 0698D—10/05/04 3 ICS91720 General I2C serial interface information How to Write: How to Read: Controller (host) sends a start bit. Controller (host) sends the write address D4 (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 (see Note 2) • ICS clock will acknowledge each byte one at a time • Controller (host) sends a Stop bit • • • • • • • • • • • • • • • • • • • • • • Index Block Read Operation Index Block Write Operation Controller (Host) starT bit T Slave Address D4(H) WR WRite Controller (host) will send start bit. Controller (host) sends the write address D4 (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 D5 (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 Controller (Host) T starT bit Slave Address D4(H) WR WRite ICS (Slave/Receiver) ICS (Slave/Receiver) ACK ACK Beginning Byte = N Beginning Byte = N ACK ACK RT Repeat starT Slave Address D5(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 0698D—10/05/04 4 Not acknowledge stoP bit ICS91720 Byte 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Pin # - Bit 0 Byte 1 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 2 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # - Pin # x x x x x x x x Affected Pin Name Control Function FS0 Spread/FS0 FS1 Spread/FS1 FS2 Spread/FS2 FS3 Spread/FS3 FS4 FS4 PD# Tri_Sate PD# Tri_Sate Spread Enable Spread Enable Spread Spectrum Control FS 3:4 Hard/Software HW/SW Control Select Type RW RW RW RW RW RW RW RW Bit Control 0 1 Hi-Z OFF LOW ON PWD 1 0 0 0 0 1 1 HW SW 0 Spread percentage See Table 1 These are I2C bits only Affected Pin Name Control Function REF_OUT REF_OUT_Enable REF_OUT Slew Rate REF-OUT FS-IN_1 FS-IN_1 Readback FS-IN_0 FS-IN_0 Readback CLK_OUT Slew Rate CLK-OUT CLK_OUT CLK_OUT_Enable (Reserved) (Reserved) (Reserved) (Reserved) Type RW RW R R RW RW R R Bit Control 0 1 Disable Enable Nominal Fast Nominal Fast Disable Enable - PWD 1 1 X X 1 1 1 1 Affected Pin Name Control Function (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) Type RW RW RW RW RW RW RW Bit Control 0 1 - PWD 1 1 1 1 1 1 1 1 0698D—10/05/04 5 ICS91720 Byte 3 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Affected Pin Bit Control Pin # X X X X x X X X Name (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) Control Function (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) Type RW RW RW RW RW RW RW RW 0 - 1 - PWD 1 1 1 1 1 1 1 1 Byte 4 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # X X X X X X X X Affected Pin Name Control Function (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) Type RW RW RW RW RW RW RW RW Bit Control 0 1 - PWD 1 1 1 1 1 1 1 1 Byte 5 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # X X X X X X X X Affected Pin Name Control Function (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) Type RW RW RW RW Bit Control 0 1 - PWD 1 1 1 1 1 1 1 1 0698D—10/05/04 6 ICS91720 Byte 6 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # X X X X X X X X Affected Pin Name Control Function Revision ID Bit 3 (Reserved) Revision ID Bit 2 (Reserved) (Reserved) Revision ID Bit 1 (Reserved) Revision ID Bit 0 (Reserved) Vendor ID Bit 3 (Reserved) Vendor ID Bit 2 (Reserved) Vendor ID Bit 1 (Reserved) Vendor ID Bit 0 0698D—10/05/04 7 Type R R R R R R R R Bit Control 0 1 - PWD 1 1 1 1 1 1 1 1 ICS91720 Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . Voltage on any pin with respect to GND . . . Storage Temperature . . . . . . . . . . . . . . . . . . . . Operating Temperature . . . . . . . . . . . . . . . . . . Ambient Operating Temperature under Bias . Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 3.3 V -0.5 to +7.0 V –55°C to +125°C 0°C to +85°C -55 to +125 °C 0.5 W 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. Electrical Characteristics - Input/Supply/Common Output Parameters TA = 0 - 85°C; Supply Voltage VDD = 3.3 V +/-5% PARAMETER SYMBOL CONDITIONS Input High Voltage VIH Input Low Voltage VIL Input High Current IIH VIN = VDD IIL1 VIN = 0 V; Inputs with no pull-up resistors Input Low Current Powerdown Current IDD3.3PD Fi VDD = 3.3 V Input Frequency Lpin Pin Inductance Logic Inputs CIN 1 COUT Output pin capacitance Input Capacitance CINX X1 & X2 pins Transition time1 Ttrans To 1st crossing of target frequency 1 Ts From 1st crossing to 1% target frequency Settling time TSTAB From VDD = 3.3 V to 1% target frequency Clk Stabilization1 Delay1 tPZH,tPZL Output enable delay (all outputs) 1 Guaranteed by design, not 100% tested in production. 0698D—10/05/04 8 MIN 2 VSS - 0.3 -5 -5 TYP MAX VDD + 0.3 0.8 5 14.318 3 - 27 36 5 80 7 5 6 45 3 3 3 10 1 UNITS V V mA mA mA MHz nH pF pF pF ms ms ms ns ICS91720 Electrical Characteristics - CLKOUT TA = 0 - 85°C; VDD = 3.3V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER SYMBOL CONDITIONS Output High Voltage VOH3 IOH = -1 mA Output Low Voltage VOL3 IOL = 1 mA Rise Time tr3 VOL = 0.41V, VOH = 0.86V Fall Time tf3 VOH = 0.86V VOL = 0.41V measurement from differential wavefrom dt3 Duty Cycle 0.35V to +035V tjcyc-cyc1 VT = 50% Jitter, Cycle to cycle 1 MIN 2.4 TYP MAX UNITS V 0.5 0.5 0.6 0.6 0.4 1 1 ns ns 45 50 55 % 50 150 ps MIN TYP MAX 20 2.4 48 60 1.2 1.2 0.4 -23 27 2 2 51 105 55 300 UNITS MHz Ω V V mA mA ns ns % ps Guaranteed by design, not 100% tested in production. Electrical Characteristics - REF TA = 0 - 85°C; VDD = 3.3V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER SYMBOL CONDITIONS Output Frequency FO1 VO = VDD*(0.5) Output Impedance RDSP11 1 IOH = -1 mA Output High Voltage VOH 1 IOL = 1 mA Output Low Voltage VOL V OH@MIN = 1.0 V, V OH@MAX = 3.135 V Output High Current IOH1 1 VOL @MIN = 1.95 V, VOL @MAX = 0.4 V Output Low Current IOL VOL = 0.4 V, VOH = 2.4 V Rise Time tr11 1 VOH = 2.4 V, VOL = 0.4 V Fall Time tf1 1 Duty Cycle VT = 1.5 V dt1 tjcyc-cyc1 VT = 1.5 V Jitter 1 Guaranteed by design, not 100% tested in production. 0698D—10/05/04 9 -29 29 1 1 45 ICS91720 150 mil (Narrow Body) SOIC SYMBOL A A1 B C D E e H h L N α In Millimeters COMMON DIMENSIONS MIN MAX 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 SEE VARIATIONS 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 SEE VARIATIONS 0° 8° In Inches COMMON DIMENSIONS MIN MAX .0532 .0688 .0040 .0098 .013 .020 .0075 .0098 SEE VARIATIONS .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 SEE VARIATIONS 0° 8° VARIATIONS N 8 D mm. MIN 4.80 MAX 5.00 D (inch) MIN MAX .1890 .1968 Reference Doc.: JEDEC Publication 95, MS-012 8-pin SOIC 10-0030 Ordering Information ICS91720yMLF-T Example: ICS XXXX y M LF- T Designation for tape and reel packaging Lead Free (Optional) Package Type M = SOIC Revision Designator (will not correlate with datasheet revision) Device Type Prefix ICS = Standard Device 0698D—10/05/04 10 ICS91720 4.40 mm. Body, 0.65 mm. Pitch TSSOP (173 mil) (25.6 mil) c N SYMBOL L E1 INDEX AREA A A1 A2 b c D E E1 e L N E 1 2 α D α aaa N A1 8 -Ce -- In Inches COMMON DIMENSIONS MIN MAX -.047 .002 .006 .032 .041 .007 .012 .0035 .008 SEE VARIATIONS 0.252 BASIC .169 .177 0.0256 BASIC .018 .030 SEE VARIATIONS 0° 8° 0.10 -- MAX 3.10 MIN .114 .004 VARIATIONS A A2 In Millimeters COMMON DIMENSIONS MIN MAX -1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 SEE VARIATIONS 6.40 BASIC 4.30 4.50 0.65 BASIC 0.45 0.75 SEE VARIATIONS 0° 8° D (inch) Reference Doc.: JEDEC Publication 95, MO-153 SEATING PLANE b D mm. MIN 2.90 10-0035 aaa C 8-pin TSSOP Ordering Information ICS91720yGLF-T Example: ICS XXXX y G LF- T Designation for tape and reel packaging Lead Free (Optional) Package Type G = TSSOP Revision Designator (will not correlate with datasheet revision) Device Type Prefix ICS = Standard Device 0698D—10/05/04 11 MAX .122