ICS9158-07 Integrated Circuit Systems, Inc. Frequency Generator and Integrated Buffer General Description Features The ICS9158-07 is a low-cost frequency generator designed specifically for desktop and notebook PC applications. Four copies of the CPU clock are available and four copies of the BUS clock are available, elimating the need for an external buffer. • • • • • • • • • • Each high drive (25mA) output is capable of driving a 30pF load and has a typical duty cycle of 50/50. The clock outputs are skew-controlled to within ±250ps. The ICS9158-07 makes a gradual transition between frequencies, so that it meets the Intel cycle-to-cycle timing specification for 486 and Pentium systems. 8 skew-free, high drive CPU/BUS clocks Reference, floppy and keyboard clocks ±250ps skew between all outputs Less than ±250ps absolute jitter Outputs can drive up to 30pF load at 1.5V/ns 50±10% duty cycle Compatible with 486 and Pentium CPUs On-chip loop filter components 3.0V - 5.5V supply range 24-pin SOIC package Applications Ideal for RISC or CISC systems such as 486, Pentium,™ PowerPC,™ etc., requiring multiple CPU and BUS clocks. Block Diagram Pentium is a trademark of Intel Corporation. PowerPC is a trademark of Motorola Corporation. NOTE: THIS DATA SHEET, ICS9158-07, IS AN ADDENDUM TO THE EXISTING ICS9158 DATA SHEET. ALL INFORMATION IN THIS DATA SHEET SUPERSEDES THE DATA FOUND IN THE ORIGINAL ICS9158 DATA SHEET. 9158-07 Rev B 053197 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any ICS9158-07 Functionality Pin Configuration VDD=5±10% or 3.3V±10%, TEMP=0-70°C OE FS2 24-Pin SOIC FS1 FS0 CLK2 Ratio CLK2 (Mhz) CLK1(0:3) CLK12(0:2) (Mhz) (MHz) 1 0 0 0 29/13 X1 31.9 16 31.9 1 0 0 1 29/13 X1 31.9 16 31.9 1 0 1 0 29/13 X1 31.9 16 31.9 1 0 1 1 29/13 X1 31.9 16 31.9 1 1 0 0 14/3 X1 66.8 33.4 66.8 1 1 0 1 7/2 X1 50.1 25 50.1 1 1 1 0 14/3 X1 66.8 33.4 66.8 1 1 1 1 21/5 X1 60.1 30 60.1 0 X X X -- Tristate Tristate Tristate Note 1: Note 2: All frequencies in MHz, assuming 14.31818 MHz reference frequency. OE equals Low, tristates CLK2, CLK12(0:2), CLK1(0:3), the REF, 24 MHz and 48 MHz clocks keep running. Pin Descriptions PIN NUMBER 1, 8, 13, 14 PIN NAME TYPE DESCRIPTION CLK1A OUT 2 X2 OUT Crystal connection. 3 X1 IN Crystal connection. 4 VDD PWR 5, 12 CPU clock 1 outputs. Digital POWER SUPPLY (+5V). GND PWR Digital GROUND/ 6 48 MHz OUT 48 MHz clock output. 7 24 MHz OUT 24 MHz floppy disk/combination I/O clock output. 9 AGND PWR 10 OE 11, 17, 21, 22 CLK12 IN OUT IN ANALOG GROUND. OUTPUT ENABLE. Tristates all clock outputs when low. CPU clock 12 outputs. 15 FS2 CPU clock frequency select 2. 16 AVDD PWR 18 REF OUT 14.318 MHz reference clock output. 19 GND PWR Digital GROUND. 20 VDD PWR Digital POWER SUPPLY (+5V). 22 CLK2 OUT CPU clock 2 outputs. 23 FS1 IN CPU clock frequency select #1. 24 FS0 IN CPU clock frequency select #0. ANALOG power supply (+5V). 2 ICS9158-07 Absolute Maximum Ratings AVDD, VDD referenced to GND . . . . . . . . . . . . . . . . 7V Operating temperature under bias. . . . . . . . . . . . . . . . 0°C to +70°C Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +150°C Voltage on I/O pins referenced to GND. . . . . . . . . . . GND -0.5V to VDD +0.5V Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 Watts Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated 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 5V VDD = +5V±10%, TA=0°C to 70°C unless otherwise stated DC Characteristics PARAMETER SYMBOL Input Low Voltage VIL Input High Voltage VIH TEST CONDITIONS MIN TYP MAX UNITS 0.8 V 2.0 V Input Low Current IIL VIN=0V -5 5 µA Input High Current IIH VIN=VDD -5 5 µA 0.4 V Output Low Voltage VOL IOL=20.0mA Output High Voltage1 VOH IOH=-30mA 2.4 3.5 V Output Low Current1 IOL VOL=0.8V 45 65 mA Output High Current1 IOH VOH=2.0V -55 -35 mA Supply Current IDD No load, 80 MHz 43 65 mA Output Frequency Change over Supply and Temperature1 FD With respect to typical frequency 0.002 0.01 % Short circuit current1 ISC Each output clock RPU Input pin Pull-up resistor value 1 Input Capacitance 1 Ci Except X1, X2 1 CL Pins X1, X2 Load Capacitance 0.25 25 56 mA kΩ 680 8 20 Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. 3 pf pf ICS9158-07 Electrical Characteristics (continued) VDD = +5V±10%, TA=0°C to 70°C unless otherwise stated AC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Output Rise time, 0.8 to 2.0V 1 tr 30pf load - 1 2 ns Rise time, 20% to 80% V DD1 tr 30pf load - 2.5 3 ns Output Fall time, 2.0 to 0.8V 1 tf 30pf load - 0.5 1 ns Fall time, 80% to 20% V DD1 tf 30pf load - 1.5 2 ns Duty cycle1 dt 30pf load 45 50 55 % Jitter, one sigma1 tj1s - 0.5 2.0 % Jitter, absolute tjab - 2 5 % Jitter, absolute tjab 500 ps As compared with clock period 16-100 MHz clocks - fi - 14.318 Clock skew between CPU and 2XCPU outputs Tsk - 100 250 ps Frequency Transition time1 tft - 13 20 ms Input Frequency From 4 to 50 MHz Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. 4 MHz ICS9158-07 24-Pin DIP Package Ordering Information ICS9158-07N Example: ICS XXXX-PPP M Package Type N=DIP (Plastic#) Pattern Number (2 or 3 digit number for parts with ROM code patterns) Device Type (consists of 3 or 4 digit numbers) Prefix ICS, AV=Standard Device 5 ICS9158-07 LEAD COUNT 24L DIMENSION L 0.604 24-Pin SOIC (wide body Ordering Information ICS9158-07M Example: ICS XXXX-PPP M Package Type M=SOIC Pattern Number (2 or 3 digit number for parts with ROM code patterns) Device Type (consists of 3 or 4 digit numbers) Prefix ICS, AV=Standard Device 6 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any