ICST ICS9158-07 Frequency generator and integrated buffer Datasheet

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.
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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
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