Integrated
Circuit
Systems, Inc.
General Description
Pentium is a trademark of Intel Corporation
Low-Cost 16-Pin Frequency Generator
AV9154A
.
The AV9154A is a 0.8mm version of the industry leading AV9154.
Like the AV9154, the AV9154A is a low-cost frequency generator
designed for general purpose PC and disk drive applications. However,
because the AV9154A uses 0.8mm technolog y and the latest phase-
locked loop architecture, it offers performance advantages that
enable the device to be sold into Pentium™ systems.
The AV9154A guarantees a 45/55 duty cycle o ver all frequencies. In
addition, a worst case jitter of ±250ps is specified at Pentium
frequencies.
The CPU clock offers the unique feature of smooth, glitch-free
transitions from one frequency to the next, making this the ideal
device to use when slo wing the CPU speed. T he AV9154A makes a
gradual transition between frequencies so that it obeys the Intel
cycle-to-cycle timing specifications for 486 and Pentium systems.
The AV9154A-42 and AV9154A-43 devices offer features specifically
for green PCs. The AV9154A-42 and -43 have a single pin that,
when pulled low, will smoothly slow the 2XCPU clock to 8 MHz.
This is ideal for dynamic DX micropr ocessors. The AV9154A-43
not only has the slow clock feature, but also of fers a glitc h-free stop
clock for static SX microprocessors. The STOPCLK# pin, when
pulled low, enables the 2XCPU clock to go low only after completing
its last full cycle. The clock continues to run internally, and will be
output again on the first full cycle immediately following stop clock
disable.
The simultaneous 2X and 1X CPU clocks offer controlled skew to
within 500ps of each other (-42 only).
ICS has been shipping motherboard frequency generators since
April 1990, and is the leader in the area of multiple output clocks on
a single chip. Consult ICS for all your clock generation needs.
• Compatible with 386, 486 and Pentium CPUs
• 45/55 Duty cycl e
• Runs up to 66 MHz at 3.3V
• Single pin can slow clock to 8 MHz (on -42 and -43)
• Single pin can stop the CPU clock glitch-free (on -43)
• Ve ry low jitter, ±250ps for Pentium frequencies
• 1X and 2X CPU clocks skew controlled to ±250ps (-42
only)
• Smooth transitions between all CPU frequencies
• Slow frequency ramp at pow er-on avoids CPU lock-up
• 16-pin PDIP or 150-mil skinny SOIC package s
• 0.8µm CMOS technology
Applications
Computer motherboards: The AV9154A-ST replaces crystals
and oscillators, saving board space, component cost, part
count and inv entory costs. It produces a switchable CPU clock
and up to four fixed clocks to drive floppy disk, communications,
super I/O , Bus, and/or keyboard devices. The small package
and 3.3V operation is perfect for handheld computers.
Features
Block Diagram
9154 Rev B 04/17/97
2
AV9154A
Pin Configuration
16-Pin PDIP or SOIC
AV9154A-27 16-Pin PDIP or SOIC
AV9154A-42 16-Pin PDIP or SOIC
AV9154A-43
Description of new pin:
SLOWCLK# forces 2XCPUCLK
output to ramp smoothly to
8MHz and CPUCLK output to 4
MHz when pulled low.
Description of new pis:
SLO WCLK# forces 2XCPUCLK
output to ramp smoothly to
8MHz when pulled low.
STOPCLK# provides gilitch-
free stop of the 2XCPUCLK
output when pulled low. When
raised back high, the
2XCPUCLK output clock
resumes full speed operation
(no clock frequency ramp up
since the internal VCO is not
stopped).
16-Pin PDIP or SOIC
9154-04
16-Pin PDIP or SOIC
9154-26
16-Pin PDIP or SOIC
9154-10
3
AV9154A
Stop Clock Feature
The ICS9154A-43 incorporates a unique stop clock
featu re compatib le with static log ic processors. When
the stop clock pin goes low, the 2XCPUCLK will go
low after the next occurring falling edge. When
STOPCLK again goes high, 2XCPUCLK resumes on
the next rising edge of the internal clock. This feature
enables fast, glitch-free starts and stops of the
2XCPUCLK and is guaranteed that the CPU does not
receive any short period clocks.
4
AV9154A
Pin Descriptions
Frequencies based upon 14.318 MHz input)
Note:
Internal Pull-up Resistors.
* -04 and -10 have no pull-ups or frequency select pins
** -10 has no pull-up or Pin 9 PDFCLK
PIN NUMBER PIN NAME TYPE DESCRIPTION
-4 -10 -26 -27 -42 -43
444444 VDD PDigital power (3.3 or 5V).
13 13 13 13 13 13 VDD P Digital power (3.3 or 5V).
555555 GND PDigital ground.
12 12 12 12 12 12 GDD P Digital ground.
888888 AGND PAnalog ground.
1 16 1 16 1 1 FS0 I Frequency select 0 for CPU clock
(has internal pull-up).*
16 15 16 15 16 16 FS1 I Frequency select 1 for CPU clock
(has internal pull-up).*
10 - 10 10 9 10 FS2 I Frequency select 2 for CPU clock
(has internal pull-up).*
- - 9 9 - - OE I Tristates outputs when low (has internal pull-up).*
----1515SLOWCLK# I
Slows 2XCPU clock to 8 MHz (active low)
(has internal pull-up).
-----9STOPCLK# I
Stops 2XCPU clock glitch-free (active low)
(has internal pull-up).
333333 X1 ICrystal In.
222222 X2 OCrystal Out.
11 10 11 11 10 11 14.318 MHz O 14.318 MHz reference clock output.
- 7 1 - - 1.84 MHz O 1.84 MHz (comm) clock output.
6116666 24 MHz O24 MHz (floppy disk) clock output.
-6---- 16 MHz O16 MHz clock output.
- - 7 7 - - 12 MHz O 12 MHz keyboard clock output.
7 1 - - 7 7 8 MHz O 8 MHz keyboard clock output.
14 14 14 - 11 - CPUCLK O CPU clock output.
15 - 15 14 14 14 2XCPUCLK O 2X CPU clock output.
9----- PD# IPower-Down All (active low) (has internal pull-up).
-9----PDFCLK# I
Power-Down Fixed Clock
(1.84, 8, 16, 24) (active low).**
5
AV9154A
* These selections only operate at 5 V.
Actual Frequencies
(using 14.318 MHz input, all frequencies in MHz)
FS2 FS1 FS0 -27
2CPUCLK -42 -43
2XCPUCLK CPUCLK 2XCPUCLK
0 0 0 75.17* 16.00 8.00 16.00
0 0 1 31.94 40.09 20.05 40.09
0 1 0 60.14 33.41 16.71 33.41
0 1 1 40.09 25.06 12.55 25.06
1 0 0 50.11 60.14 30.07 60.14
1 0 1 66.48 20.05 10.03 20.05
1 1 0 80.18* 66.48 33.24 66.48
1 1 1 51.90 50.11 25.06 50.11
Clock Tables
(using 14.318 M Hz input, all frequencies in MHz)
FS2 FS1 FS0 -27
2XCPUCLK -42 -43
2XCPUCLK
2XCPUCLK CPUCLK ^
0 0 0 75* 16 8 16
0 0 1 32 40 20 40
0 1 0 60 33.33 16.67 33.33
0 1 1 40 25 12.50 25
1 0 0 50 60 30 60
1 0 1 66.66 20 10 20
1 1 0 80* 66.66 33.33 66.66
1 1 1 52 50 25 50
Fixed Clock Output
Actual Frequencies
(using 14.318 MHz input,
all freqencies in MHz)
14.318
1.84
24.0
12.0
8.0
Clock Tables in MHz
for -04 and -10
(using 14.318 MHz input ,
all frequencies in MHz)
FS(3:0) -04 -10
2XCPU CPU CPUCL-
K
0 100* 50* PDCPU
1 80* 40* 40
2 66.6 33.3 50
3 50 25 66.6
44020-
53216-
62412-
7168-
-
Clock Table for AV9154A-26
(using 14.318 MHz input all frequencies in
MHz)
FS(2:0) 2XCPU
(MHz) CPUCLK
(MHz)
0 100.23* 50.11
1 80.18* 40.09
2 66.48* 33.24
3 50.11 25.06
4 40.09 20.05
5 32.22 16.11
6 24.23 12.12
7 15.75 7.88
6
AV9154A
Absolute Maximum Ratings
VDD referenced to GND........................................................................... 7.0 V
Voltage on I/O pins referenced to GND ..... GND - 0.5 V to VDD + 0.5 V
Operating Temperature under bias..............................................0 to +70 ºC
Power Dissipation ................................................................................... 0.5 W
Storage Temperature............................................................... -40 to +150 ºC
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stess
specifica tions only and functional operation of the device at these or any other conditions above those listed in the oper ational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for e xtended periods ma y af fect
product reliability.
VDD = 3.3 V ± 10%, TA = 0 - 70 oC unless otherwise stated
Electrical Characteristics at 3.3 V
Notes:
1. Parameter is guaranteed by design and characterization.
DC Characteristics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Low Voltage VIL - - 0.2 VDD V
Input High Voltage VIH 0.7 V - - V
Input Low Current IIL VIN = 0V (pull-up pin) - 2.5 7.0 A
Input High Current IIH VIN = VDD -5.0 - 5.0 A
Output Low Voltage VOL IOL = 6mA - 0.05 VDD 0.1 VDD V
Output High Voltage1VOH IOH = -4mA 0.85 VDD 0.94 VDD - V
Output Low Current1IOL VOL = 0.2VDD 15.0 24 - mA
Output High Current1IOH VOH = 0.7VDD - -13 -8.0 mA
Supply Current IDD unloaded, 60 M Hz - 16 34 mA
Output Frequency
Change over Supply
and Temperature1FD With respect to typical frequency - 0.002 0.01 %
Short circuit current1ISC each output clock 20 30 - mA
Input Capacitance1CI except X1, X2 - - 10 pF
Load Capacitance1CL pins X1, X2 - 20 - pF
Pull-up Resistor1Rpu at VDD - 0.5V - 620 900 k ohm
7
AV9154A
Electrical Characteristics at 3.3 V
VDD = 3.3 V ± 10%, TA = 0 - 70 oC unless otherwise stated
Notes:
1. Parameter is guaranteed by design and characterization. Not subject to production testing.
AC Characteristics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Clo ck R ise T ime1tICr - - 20 ns
Input Clo ck F all Time 1tICf - - 20 ns
Rise time, 20% to 80%
VDD1tr15pF load - 2.2 3.5 ns
Fall time, 80% to 20%
VDD1tf15pF load - 1.2 2.5 ns
D uty cycl e at 50% VDD1dt15pF load 40/60 48/52 60/40 %
D uty cycl e, ref eren ce
clocks1dt15pF load 50/65 43/57 65/50 %
Jitter, one sigma, 20-66
MHz clocks1tj1s 10,000 cycles - 100 200 ps
Jitter, one sigma, clocks
below 20 MHz1tjls 10,000 cycles - 1.0 2.0 %
Jitter, absolute, 20-66
MHz clocks1tjab 10,000 cycles -350 - 350 ps
Jitter, absolute, clocks
below 20 MHz1tjab 10,000 cycles - 1.5 4.0 %
Input Fr eq uenc y1fin 2 14.318 32 MHz
Maximum Output
Frequency1fout 70 - - MHz
Clock skew between CPU
and 2XCPU outputs1Tsk AV9154A-42 - 220 500 ps
Power-up Time1ttPO off to 50 MHz - 6 12 ms
Frequency Transition
Time1tft from 8 to 50 MHz - 4.5 10 ms
8
AV9154A
DC Characteristics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Low Voltage VIL VDD=5 V - - 0.8 V
Input High Voltage VIH VDD=5 V 2.0 - - V
Input Low Current IIL VIN=0 V (pull-up pin) - 6 15 A
Input High Current IIH VIN = VDD -5 - 5 A
Output Low Voltage VOL IOL = 10 mA - 0.15 0.4 V
Output High Voltage1VOH IOH = -30 mA 2.4 3.7 - V
Output Low Current1IOL VOL = 0. 8 V 2 5 45 - mA
Output High Current1IOH VOH = 2. 4 V - - 53 -35 mA
Supply Current IDD unloaded, 66 MHz - 25 50 mA
Output Frequency Change
over Supply and Temperature1FDwith respect to typical
frequency - 0.002 0.01 %
Short circuit current1ISC each output clock 25 40 - mA
Input Capacitance1CIexcept X1, X2 - - 10 pF
Load Capacitance1CLpins X1, X2 - 20 - pF
Pull-up Resistor1Rpu A + VDD -1 V - 400 700 k ohm
Electrical Characteristics at 5.0 V
Notes:
1. Parameter is guaranteed by design and characteriz ation. Not subject to production testing.
VDD = +5 ± 10% V, TA = 0 - 70oC unless otherwise stated
9
AV9154A
Electrical Characteristics at 5.0 V
VDD = +5 ±10% V, TA = 0 - 70oC unless otherwise stated
AC Characteristics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Clock Rise Time1tICr - - 20 ns
Input Clock Fall Time1tICf - - 20 ns
Output Rise time, 0.8 to
2.0V1tr15pF load - 1.5 2 ns
Rise time, 20% to 80% V1tr15pF load - 2.0 3 ns
Output Fall time, 2.0 to
0.8V1tf15pF load - 0.5 1.5 ns
Fall time, 80% to 20% V1tf15pF load - 2.0 3.0 ns
Duty cycle at 1.4V1dt15pF load, VDD = 5V±5% 45/55 48/52 55/45 %
Duty cycle, reference
clocks1dt15 pF load 40/65 43/57 65/40 %
Jitter, one sigma, 20 MHz-
80 MHz clocks1tj1s 10,000 cycles - 70 140 ps
Jitter, one sigma, clocks
below 20 MHz1tjls 10,000 cycles - 0.8 2.0 %
Jitter, absolute, 20 MHz-
80 MHz clocks1tjab 10,000 cycles -250 - 250 ps
Jitter, absolute, clocks
below 20 MHz1tjab 10,000 cycles - 1.0 3.0 %
Input Frequency fin 2 14.318 32 MHz
Maximum Output
Frequency1fout 140 - - MHz
Clock skew between CPU
and 2XCPU outputs1Tsk AV9154A-42 - 140 400 ps
Power-up Time1ttPO to 80 MHz - 8 15 ms
Frequency Transition
Time1tft from 8 to 66.66 MHz - 6.5 12 ms
Notes:
1. Parameter is guaranteed by design and characteriz ation. Not subject to production testing.
10
AV9154A
Example:
ICS XXXX-PPP M X#W Lead Count & Package Width
Lead Count=1,2, or 3 digits
W=0.3" SOIC or 0.6" DIP; None=Standard Width
Package Type
N=DIP (Plastic),
S=SOIC
Device Type (consists of 3 or 4-digit numbers)
Prefix
ICS, AV=Standard Device; GSP=Genlock device
Pattern Number (2 or 3-digit number for parts with ROM-code patterns)
0.765
0.130
0.060
0.018 0.100
0.130
0 ~ 5º 0.010
0.260
0.360
0.015min
0.325
16-Pin PDIP Package
0.390
0.031
0.024 0.016 0.050
0.063
0.006±0.004
0.238
0.154
0.008
0.015
0.025
16-Pin SOIC Package
Ordering Information
AV9154A-27CN16
AV9154A-42CN16
AV9154A-43CN16
AV9154A-04CN16
AV9154A-10CN16
AV9154A-26CN16
AV9154A-27CS16
AV9154A-42CS16
AV9154A-43CS16
AV9154A-04CS16
AV9154A-10CS16
AV9154A-26CS16
