Integrated
Circuit
Systems, Inc.
General Description Features
ICS9133X
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
d ata to verify that any informa tion being relied upon by the customer is current and accurat e.
The ICS9133X is designed to generate clocks for all 286, 386,
486, Pentium and RISC-based motherboards, including lap-
tops and notebook computers. The only external components
required are a 32.768 kHz crystal and decoupling capacitors.
The device generates the 14.318 MHz system clock, eliminating
the need for a 14.318 MHz crystal. High performance applications
may require high speed clock termina tion components. The
chip includes three independent clock generators plus the
32.768 kHz reference clock to produce all necessary frequencies,
including real time clock/DRAM refresh, master clock, CPU
clock, twice CPUclock frequency, keyboard clock, floppy
disk controller clock, serial communications clock and bus
clocks. Different fr equencies from clock #2 can be selected
using the frequency select pins, but c lock #1 will be at 14.318
MHz for all standard versions.
• Single 32.768 kHz crystal generates all PC
motherboard clocks
• Cost-reduced version of popular ICS9132
• Contains internal crystal load capacitors and
feedback bias
• 3 independent clock generators
• Generates CPU clocks from 12.5 to 100 MHz
• Up to 7 output clocks
• Sep arate VDD for 32 kHz clock
• Output enable tristates outputs
• P ow e r-down options available
• Operates from 3.3V or 5.0V supply
• Operates up to 66 MHz at 3.3V
• Skew controlled 1X and 2X CPU clo ck s
• 20-pin PDIP or SOIC package
ICS9133XRevA052897P
Block Diagram
32 kHz Motherboard Frequency Generator
VDD32 Supply
The ICS9133X has a separate power supply for the 32.768
kHz oscillator cir cuitry. This allows the 32 kHz clock to run
from a battery or other source while the main power to the
chip is disconnected. The VDD32 supply is guaranteed to
operate down to +2.0V, with the clock consuming less than
10µA at +3.3V with the main VDD at 0V.
The frequencies and power-down options in the ICS9133X
are mask programmable. Customer specific masks can be
made and prototypes deliver ed within 6-8 weeks from r eceipt
of order. Integrated Circuit Systems also of fers standard versions,
such as that described in this data sheet.
Applications
Notebook/Palmtop Computers: The ICS9133X works with
+3V and +5V and a single 32.768 kHz crystal, making it the
ideal solution for generating clocks in portables with minimum
board space. The user can save po wer b y using this single part
instead of oscillators or other frequency generators. The
ICS9133X further reduces the current consumption by having
the ability to completely shut down the individual clocks
when not in use, while still maintaining the separately powered
32.768 kHz clock.
2
ICS9133X
Pin Configuration Decoding Table for CPU Clock
Pin Descriptions
* Only at 5V supply voltage
20-Pin PDIP or SOIC
PIN
NUMBER PIN NAME TYPE DESCRIPTION
1 32 kHz Output 32.768 kHz buffered output, powered by VDD32.
2 X2 Output Connect 32.768 kHz crystal. Includes internal XTAL load capacitance.
3 X1 Input Connect 32.768 kHz crystal. This pin includes internal XTAL load capacitance and
feedback bias for a 32.768 kHz crystal.
4 VDD32 - Power supply for 32 kHz oscillator only.
5 VDD - Power supply (+3.3 to +5.0V).
6 GND - GROUND.
7 16 MHz Output 16 MHz clock output.
8 24 MHz Output 24 MHz clock output.
9 12 MHz Output 12 MHz clock output.
10 GND - GROUND.
11 OE Input OE tristate outputs when low. Has internal pull-up.
12 VDD - Power supply (+3.3 to +5.0V).
13 14.318 MHz Output 14.318 MHz clock output.
14 GND - GROUND.
15 VDD - Power supply (+3.3 to +5.0V).
16 2XCPU Output 2XCPU clock output (see decoding table).
17 CPU Output CPU clock output (see decoding table).
18 SCLK2 Input CPU clock frequency SELECT2. Has internal pull-up.
19 SCLK1 Input CPU clock frequency SELECT1. Has internal pull-up.
20 SCLK0 Input CPU clock frequency SELECT0. Has internal pull-up.
SCLK22 SCLK21 SCLK20 2XCPU CPU
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
8
16
32
40
50
66.6
80*
100*
4
8
16
20
25
33.3
40*
50*
3
ICS9133X
Block Diagram for ICS9133X
Recommended External Circuit
Reference
Clock
32.768 kHz
crystal
32.768 kHz
14.318 MHz
14.318 MHz
Clock
Generator
Output
Buffers
CPU
OE
16 MHz
12 MHz
24 MHz
CPU Clock 2XCPU
Peripheral
Clocks Output
Buffers
Output
Buffers
Frequency Select
3/
Notes:
1. The external components shown should be placed as close to the device as possible.
2. Pins 5 and 15 should be connected together externally. One decoupling capacitor may suffice f or both pins.
3. May be part of system decoupling.
4. Crystal load capacitance and feedback bias contained internally on the X1, X2 pins.
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
0.1µF
0.1µF
0.1µF
2.2µF
0.1µF
(Note 3)
32.768
kHz
VDDX
(Note 4)
VDD
ICS9133X
4
ICS9133X
Electrical Characteristics at 3.3V
Operating VDD = +3.0V to 3.7V; TA =0°C to 70°C unless otherwise stated
Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
2. 32 kHz output duty cycle is dependent on crystal used.
Absolute Maximum Ratings
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 refer enced to GND........................................................................................GND -0.5V to VDD +0.5V
Power dissipation..........................................................................................................................................................0.5 Watts
Stresses above those listed under Absolute Maximum Ra tings 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 f o r extended periods may aff ect product
reliability.
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 (Pull-up) -12 - - µA
Input High Current IIH VIN=VDD -2-2µA
Output Low Voltage1VOL IOL=4mA - - 0.1 V
Output High Voltage1VOH IOH=-1mA VDD-.1V - - V
Output High Current1VOH IOH=-4mA - - - V
Output High Current1VOH IOH=-8mA 2.4 - - V
Output Frequency Change
over Supply and
Temperature1
FDWith respect to typical
frequency1- .005 0.05 %
Short Circuit Current1ISC Each output clock - 15 - mA
Supply Current IDD No load, 40 MHz - 10 - mA
VDD32 Supply Current IDD 32 No load, VDD32=3.7V - 5 12 µA
VDD32 Supply Voltage VDD 32 VDD=0 to 3.7V, 32 kHz output
operating 2.0- -V
Pull-up Resistor Value Rpu - 620 - k½
AC Characteristics
Input Clock Rise Time1tICr --5µs
Input Clock Fall Time1tICf --5µs
Output Rise Time1tr15pF load, 0.8 to 2.0V - 1.5 2 ns
Rise Time1tf15pF load, 20% to 80% VDD - 2.54ns
Output Fall Time1tf15pF load, 2.0 to 0.8V - 1.5 2 ns
Fall Time1tf15pF load, 80% to 20% VDD - 2.54ns
Duty Cycle1dt15pF load @ Vth=1.4V 43/57 48/52 57/43 %
Duty Cycle, reference
clocks1dt15pF load @ 1.4V240/60 43/57 60/40 %
Jitter, One Sigma1As compared with clock period. - 1 3 %
Jitter, Absolute1tjab -25%
Input Frequency1fi25 32.768 40 kHz
Clock Skew between any
Clock #2 outputs1Tsk - 100 500 ps
Power-up Time1tpu From off to 40 MHz - 1,000 - ms
5
ICS9133X
Electrical Characteristics at 5V
VDD = +5.0V ±10%; TA =0°C to 70°C unless otherwise stated
Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
2. 32 kHz output duty cycle is dependent on crystal used.
DC Characteristics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Low Voltage VIL --0.2V
DD V
Input High Voltage VIH 0.7VDD --V
Input Low Current IIL VIN=0V (Pull-up) -15 - - µA
Input High Current IIH VIN=VDD -2 - 2 µA
Output Low Voltage1VOL IOL=4mA - - 0.1 V
Output High Voltage1VOH IOH=-1mA VDD-.1V - - V
Output High Voltage1VOH IOH=-4mA - - - V
Output High Voltage1VOH IOH=-8mA 2.4 - - V
Output Frequency Change
over Supply and
Temperature1FDWith respect to typical
frequency1- .005 0.05 %
Short Circuit Current1ISC Each output clock - 33 - mA
Supply Current IDD No load, 40 MHz - 17 - mA
VDD32 Supply Current IDD 32 No load, VDD32=5.5V - 7.5 20 µA
VDD32 Supply Voltage VDD 32 VDD=0 to 5.5V, 32 kHz output
operating 2.0- -V
Pull-up Resistor Value Rpu -380-k½
AC Characteristics
Input Clock Rise Time1tICr --5µs
Input Clock Fall Time1tICf --5µs
Output Rise Time1tr15pF load, 0.8 to 2.0V - 1 1.5 ns
Rise Time1tr15pF load, 20% to 80% VDD -23ns
Output Fall Time1tf15pF load, 2.0 to 0.8V - 1 1.5 ns
Fall Time1tf15pF load, 80% to 20% VDD -23ns
Duty Cycle1dt15pF load @ Vth=1.4V 43/57 48/52 57/43 %
Duty Cycle, reference
clocks1dt15pF load @ 1.4V240/60 43/57 60/40 %
Jitter, One Sigma1tj1s As compared with clock period. -13%
Jitter, Absolute1tjab -25%
Input Frequency1fi25 32.768 40 kHz
Clock Skew between any
Clock #2 outputs1Tsk - 100 500 ps
Power-up Time1tpu From off to 40 MHz - 10 - ms
6
ICS9133X
Typical 32 kHz Suppl y Current
14
12
10
µA8
6
4
2
0
0123
Vdd
456
C
L
= 25pF
C
L
= 15pF
C
L
= 0pF
7
ICS9133X
20-Pin DIP Packag e
Ordering Information
Package Information
1.025 0.260
0.325
0.010
0.360
0 ~ 5°
0.130 0.015
min 0.060
0.018 0.100
0.130
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)
Device Type (consists of 3 or 4-digit numbers)
Prefix
ICS, AV=Standard Device
Pattern Number (2 or 3-digit number for parts with ROM code patterns)
8
ICS9133X
5 Deg. Typ.
LEAD COUNT
DIMENSION L 20L
.504
0.101 ± 0.010
0.328 ± 0.010
0.015 x 45 Deg.
0.406 ± 0.010
0.020
0.092 ± 0.005
0.041 ± 0.003
0.296 ± 0.005
0.010
0.050
Pitch Typ.
0.008 ± 0.006
5 Deg. Typ. ± 5
5 Deg. Typ.
L ± .008
0.029
Typ. 0.018
0.047R
Pin 1
SOIC Packages (Widebody)
Ordering Information
ICS9133X-01CW20
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
W=DIP (Plastic)
Device Type (consists of 3 or 4-digit numbers)
Prefix
ICS, AV=Standard Device
Pattern Number (2 or 3-digit number for parts with ROM code patterns)
ICS reserves the right to make changes in the device data identified in this publica tion
without further notice. ICS advises its customers to obtain the latest version of all device
d ata to verify that any informa tion being relied upon by the customer is current and accurat e.