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Integrated Circuit Systems, Inc.
ICS9158-07
Frequency Generator and Integrated Buffer
General Description
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.
Features
* * * * * * * * * * 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 5010% 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,TM PowerPC,TM 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
Pin Configuration Functionality
VDD=510% or 3.3V10%, TEMP=0-70C
OE FS2 1 1 1 1 1 1 1 1 0
Note 1: Note 2:
FS1 0 0 1 1 0 0 1 1 X
FS0 0 1 0 1 0 1 0 1 X
CLK2 Ratio 29/13 X1 29/13 X1 29/13 X1 29/13 X1 14/3 X1 7/2 X1 14/3 X1 21/5 X1 --
CLK2 (Mhz) 31.9 31.9 31.9 31.9 66.8 50.1 66.8 60.1 Tristate
CLK1(0:3) CLK12(0:2) (Mhz) (MHz) 16 16 16 16 33.4 25 33.4 30 Tristate 31.9 31.9 31.9 31.9 66.8 50.1 66.8 60.1 Tristate
0 0 0 0 1 1 1 1 X
24-Pin SOIC
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 2 3 4 5, 12 6 7 9 10 11, 17, 21, 22 15 16 18 19 20 22 23 24 PIN NAME CLK1A X2 X1 VDD GND 48 MHz 24 MHz AGND OE CLK12 FS2 AVDD REF GND VDD CLK2 FS1 FS0 TYPE OUT OUT IN PWR PWR OUT OUT PWR IN OUT IN PWR OUT PWR PWR OUT IN IN CPU clock 1 outputs. Crystal connection. Crystal connection. Digital POWER SUPPLY (+5V). Digital GROUND/ 48 MHz clock output. 24 MHz floppy disk/combination I/O clock output. ANALOG GROUND. OUTPUT ENABLE. Tristates all clock outputs when low. CPU clock 12 outputs. CPU clock frequency select 2. ANALOG power supply (+5V). 14.318 MHz reference clock output. Digital GROUND. Digital POWER SUPPLY (+5V). CPU clock 2 outputs. CPU clock frequency select #1. CPU clock frequency select #0. DESCRIPTION
2
ICS9158-07
Absolute Maximum Ratings
AVDD, VDD referenced to GND . . . . . . . . . . . . . . . . 7V Operating temperature under bias. . . . . . . . . . . . . . . . 0C to +70C Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to +150C 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 = +5V10%, TA=0C to 70C unless otherwise stated
DC Characteristics
PARAMETER Input Low Voltage Input High Voltage Input Low Current Input High Current Output Low Voltage Output High Voltage1 Output Low Current1 Output High Current1 Supply Current Output Frequency Change over Supply and Temperature1 Short circuit current1 Pull-up resistor value Input Capacitance 1 Load Capacitance
1 1
SYMBOL VIL VIH IIL IIH VOL VOH IOL IOH IDD FD ISC RPU Ci CL
TEST CONDITIONS
MIN 2.0
TYP
MAX 0.8
UNITS V V A A V V mA
VIN=0V VIN=VDD IOL=20.0mA IOH=-30mA VOL=0.8V VOH=2.0V No load, 80 MHz With respect to typical frequency Each output clock Input pin Except X1, X2 Pins X1, X2
-5 -5 0.25 2.4 45 3.5 65 -55 43 0.002 25 56 680
5 5 0.4
-35 65 0.01
mA mA % mA k
8 20
pf pf
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
3
ICS9158-07
Electrical Characteristics (continued)
VDD = +5V10%, TA=0C to 70C unless otherwise stated
AC Characteristics
PARAMETER Output Rise time, 0.8 to 2.0V 1 Rise time, 20% to 80% VDD1 Output Fall time, 2.0 to 0.8V 1 Fall time, 80% to 20% VDD1 Duty cycle1 Jitter, one sigma1 Jitter, absolute Jitter, absolute Input Frequency Clock skew between CPU and 2XCPU outputs Frequency Transition time1
SYMBOL tr tr tf tf dt tj1s tjab tjab fi Tsk tft
TEST CONDITIONS 30pf load 30pf load 30pf load 30pf load 30pf load As compared with clock period 16-100 MHz clocks
MIN 45 -
TYP 1 2.5 0.5 1.5 50 0.5 2
MAX 2 3 1 2 55 2.0 5 500
UNITS ns ns ns ns % % % ps MHz
14.318 100 13 250 20
ps ms
From 4 to 50 MHz
-
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
4
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 DIMENSION L
24L 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

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