ICS9159-06 Integrated Circuit Systems, Inc. Preliminary Product Preview Frequency Generator and Buffer for Pentium Systems General Description The ICS9159-06 is a low cost frequency generator designed specifically for Pentium systems. The integrated buffer minimizes skew and provides the early CPU clock required by some chipsets such as the OPTi VIPER.A 14.318 MHz XTAL oscillator provides the reference clock to generate standard Pentium frequencies. The CPU clock makes gradual frequency transitions without violating the PLL timing of internal microprocessor clock multipliers. Asynchronous 33.3 MHz PCI bus operation is supported, in-dependent of the CPU operating frequency. Green PC systems are supported through power-down, doze, and glitch-free stop clock modes. Features Four CPU clocks operate up to 66 MHz at 3.3V with glitch-free start and stop plus smooth transitions 3-6ns early CPU clock supports OPTi VIPER systems Selection of 8 frequencies, tristate, or power-down Six BUS clocks support asynchronous PCI bus operation ±250ps skew between synchronous outputs Integrated buffer outputs drive up to 30pF loads 3.1V -5.5V supply range 28-pin 300-mil SOIC package Applications Block Diagram Ideal for green Pentium and 486 PCI systems Functionality 3.1 to 5.5V, 0-70° Crystal=14.318 MHz input STP0# STP1# DOZE# FS(0:1) CPU(0:1) (MHz) CPU2, ECPU BUS(0:5) REF(0:3) (MHz) (MHz) 1 X 1 00 66.6* 66.6* 33.3 14.318 1 X 1 01 60* 60* 33.3 14.318 1 X 1 10 50 50 33.3 14.318 1 X 1 11 40 40 33.3 14.318 1 X 0 00 33.3 33.3 16.7 14.318 1 X 0 01 30 30 16.7 14.318 1 X 0 10 25 25 16.7 14.318 1 X 0 11 22.5 22.5 16.7 14.318 0 1 1 -- Stop Run Run 14.318 0 0 1 XX Stop Stop Stop 14.318 0 0* 0* XX Low Low Low 14.318 0 1 0 XX Tristate Tristate Tristate 14.318 * 3.3 volt operation only. ** 000 mode powers-down the PLL sections and forces the outputs low. To ensure glitchfree start and stop of the CPU and BUS clocks enter 000 from 001 and exit 000 through 001. COMPAQ is a trademark of Compaq Computers. Pentium is a trademark of Intel Corporation. 9159-06 Rev C 091897 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. ICS9159-06 Preliminary Product Preview Pin Configuration 28-Pin 300-mil SOIC Pin Descriptions PIN NUMBER 8, 26 PIN NAME VDD TYPE PWR 1 X1 IN 2 X2 OUT GND PWR 3, 11, 23 6, 7, 9 CPU(0:2) OUT 4, 5 FS(0:1) IN 20 DESCRIPTION Power for logic, CPU and fixed frequency output buffers. XTAL or external reference frequency input. This input includes XTAL load capacitance and feedback bias for a 0.5 - 20 MHz XTAL.** XTAL output which includes XTAL load capacitance.** Ground for logic, CPU and fixed frequency output buffers. Processor clock outputs which are a multiple of the input reference frequency as shown in the table. Frequency multiplier select pins. See table. These inputs have internal pull-up devices. VDDB PWR Power for BUS output buffers. 15, 16, 18 19, 21, 22 BUS(0:5) OUT Bus clock outputs are fixed at 33.3 or 16.7 MHz.* 24, 25, 27, 28 REF(0:3) OUT 10 ECPU OUT 12 DOZE# IN STP0#, STP1# IN 13, 14 17 GNDB PWR REF is a buffered copy of the crystal oscillator or reference input clock, nominally 14.31818 MHz.* Early processor clock output which is the same frequency as CPU(0:2). This clock leads CPU(0:2) by 3-6nS. Reduces CPU, ECPU and BUS clock outputs as shown in the functionality table when at a logic low level. Synchronously stops the CPU, ECPU and BUS clocks per the description in the functionality table. Can also be used to tristate all outputs when the DOZE pin is low. This ground return path is brought on separately to permit separating the noise impulses from high output buffers from affecting sensitive internal circuitry.*** * Assuming 14.31818 MHz input clock or crystal. * * Device provides 18pF load for crystal load capacitance at each pin. *** Ground for bus clock buffers. 2 ICS9159-06 Preliminary Product Preview Absolute Maximum Ratings Supply Voltage .......................................................................................................... 7.0 V Logic Inputs ....................................................................... GND 0.5 V to VDD +0.5 V Ambient Operating Temperature ............................................................. 0°C to +70°C Storage Temperature ........................................................................... 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. Electrical Characteristics at 3.3V VDD = 3.0 3.7 V, TA = 0 70° C unless otherwise stated DC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Input Low Voltage VIL - - 0.2VDD V Input High Voltage VIH 0.7VDD - - V Input Low Current IIL VIN=0V -28.0 -10.5 - µA IIH VIN=VDD -5.0 - 5.0 µA 1 IOL VOL=0.8V; for CPU & BUS 30.0 47.0 - mA Output High Current1 IOH VOL=2.0V; for CPU & BUS - -66.0 -42.0 mA 1 Output Low Current IOL VOL=0.8V; for REF 25.0 38.0 - mA Output High Current1 IOH VOL=2.0V; for REF - -47.0 -30.0 mA Output Low Voltage VOL IOL=15mA; for CPU & BUS - 0.30 .4 V Output High Voltage1 VOH IOH=-30mA; for CPU & BUS 2.4 2.8 - V Output Low Voltage VOL IOL=12.5mA; for REF - 0.30 .4 V Output High Voltage1 VOH IOH=-20mA; for REF 2.4 2.8 - V Supply Current IDD @66.66 MHz; all outputs unloaded - 55 110 mA IDD (PD) @000 Mode (Power-down) - 8 20 mA IDD (STOP) @001 Mode (Stop Mode) - 35 70 mA Input High Current Output Low Current Supply Current, Power-down Supply Current, Stop Mode Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. 3 ICS9159-06 Preliminary Product Preview Electrical Characteristics at 3.3V VDD = 3.1 3.7 V, TA = 0 70° C AC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Rise Time1 Tr1 20pF load, 0.8 to 2.0V, CPU & BUS - 0.9 1.5 ns Fall Time1 Tf1 20pF load, 2.0 to 0.8V, CPU & BUS - 0.8 1.4 ns Rise Time1 Tr2 20pF load, 20% to 80%, CPU & BUS - 1.5 2.5 ns Fall Time1 Tf2 20pF load, 80% to 20%, CPU & BUS - 1.4 2.4 ns Duty Cycle1 Dt 20pF load; @VOUT=1.4V 40 50 60 % Jitter, One Sigma1 Tj1s - 60 150 ps Jitter, Absolute1 Tjab -350 - 350 ps Jitter, One Sigma1 Tj1s - 0.7 2.0 % Jitter, Absolute1 Tjab -3.0 - 3.0 % Input Frequency1 Fi - 5 - pF - 18 - pF - 2.5 4.5 ms - 2.0 4.0 ms - 150 250 ps - 300 500 ps 3.0 5.0 6.0 ns Crystal Oscillator Capacitance1 CINX Power-on Time1 ton Frequency Settling Time1 ts Clock Skew Window1 Tsk1 Clock Skew Window1 Tsk2 Clock Skew Window1 Tsk3 CPU; ECPU Load=20pF; FOUT >25 MHz CPU; ECPU Load=20pF, FOUT >25 MHz BUS(0:2); REF(0:3); CPU ≥25 MHz; Load=20pF; Comp. to the period BUS(0:2); REF(0:3); CPU ≥ 25 MHz; Load=20pF; Comp. to the period 0.5 14.318 20 MHz Logic Input Capacitance 1 CIN Logic input pins X1, X2 pins From VDD=1.6V to 1 st crossing of 66.6 MHz VDD supply ramp < 40ms From 1 st crossing of acquisition to <1% settling CPU to CPU; Load=20pF; @1.4V BUS to BUS and REF to REF; Load=20pF; @1.4V ECPU to CPU(0:2); Load=20pF; @1.4V Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. 4 ICS9159-06 Preliminary Product Preview Electrical Characteristics at 5.5V VDD = 4.5 5.5 V, TA = 0 70° C DC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Input Low Voltage VIL - - 0.2VDD V Input High Voltage VIH 0.7VDD - - V Input Low Current IIL VIN = 0V -40.0 16.0 - µA Input High Current IIH VIN = VDD -5.0 - 5.0 µA Output Low Current1 IOL VOL = 0.8V; for CPU & BUS 40.0 62.0 - mA Output High Current1 IOH VOL = 2.0V; for CPU & BUS - -140.0 -90.0 mA Output Low Current1 IOL VOL = 0.8V; for REF 30.0 50.0 - mA Output High Current1 IOH VOL = 2.0V; for REF - -100.0 -60.0 mA Output Low Voltage VOL IOL = 20mA; for CPU & BUS - 0.3 0.4 V Output High Voltage1 VOH IOH = -70mA; for CPU & BUS 2.4 2.8 - V Output Low Voltage VOL IOL = 15mA; for REF - 0.30 .4 V Output High Voltage1 VOH IOH=-50mA; for REF 2.4 2.8 - V Supply Current IDD @50.0 MHz; all outputs unloaded - 95.0 200.0 mA Supply Current, Power-down IDD(PD) @000 Mode (Power-down) - 16.0 40.0 mA Supply Current, Stop Mode IDD(STOP) @001 Mode (Stop Mode) - 70.0 140.0 mA Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. 5 ICS9159-06 Preliminary Product Preview Electrical Characteristics at 5.5V VDD = 4.5 5.5 V, TA = 0 70° C AC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Rise Time1 Tr1 20pF load, 0.8 to 2.0V, CPU & BUS - 0.55 0.95 ns Fall Time1 Tf1 20pF load, 2.0 to 0.8V, CPU & BUS - 0.52 0.90 ns Rise Time1 Tr2 20pF load, 20% to 80%, CPU & BUS - 1.2 2.1 ns Fall Time1 Tf2 20pF load, 80% to 20%, CPU & BUS - 1.1 2.0 ns Duty Cycle1 Dt1 20pF load; @VOUT=1.4V 50 56 70 % Duty Cycle1 Dt2 20pF load; @VOUT=50% 40 50 60 % Jitter, One Sigma1 Tj1s - 60 150 ps Jitter, Absolute1 Tjab -350 - 350 ps Jitter, One Sigma1 Tj1s - 0.7 2.0 % Jitter, Absolute1 Tjab -3.0 - 3.0 % Input Frequency1 Fi 0.5 14.318 20 MHz CPU; ECPU Load=20pF; FOUT > 25 MHz CPU; ECPU Load=20pF, FOUT > 25 MHz BUS(0:2); REF(0:3); CPU≥25 MHz; Load=20pF; Comp. to the period BUS(0:2); REF(0:3); CPU≥25 MHz; Load=20pF; Comp. to the period Logic Input Capacitance1 CIN Logic input pins - 5 - pF Crystal Oscillator Capacitance1 CINX X1, X2 pins - 8 - pF - 2.5 4.5 ms - 2.0 4.0 ms - 150 250 ps - 300 500 ps 3.0 5.0 6.0 ns Power-on Time1 ton Frequency Settling Time1 ts Clock Skew Window1 Tsk1 Clock Skew Window1 Tsk2 Clock Skew Window1 Tsk3 From VDD=1.6V to 1st crossing of 50.0 MHz VDD supply ramp < 40ms From 1 st crossing of acquisition to < 1% settling CPU to CPU; Load=20pF; @1.4V BUS to BUS and REF to REF; Load=20pF; @1.4V ECPU to CPU(0:2); Load=20pF; @1.4V Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. 6 ICS9159-06 Preliminary Product Preview LEAD COUNT 28L DIMENSIONL 0.704 SOIC Package Ordering Information ICS9159M-06 Example: ICS XXXX M-PPP Pattern Number(2 or 3 digit number for parts with ROM code patterns) Package Type M=SOIC, SOP Device Type (consists of 3 or 4 digit numbers) Prefix ICS=Standard Device 7 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.