ICS9131-01CS16 [ICSI]
32 KhZ Motherboard Frequency Generator; 32 kHz的主板频率发生器
| 型号： | ICS9131-01CS16 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | 32 KhZ Motherboard Frequency Generator |
| 文件： | 总8页 (文件大小：298K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS9131
Integrated
Circuit
Systems, Inc.
32 KhZ Motherboard Frequency Generator
General Description
Features
The ICS9131 offers a tiny footprint solution for generating
a selectable CPU clock from a 32.768 kHz crystal. The device
allows a variety of microprocessors to be clocked by changing
the state of address lines FS0, FS1, and FS2. The ICS9131 is
the ideal solution for replacing high speed oscillators and for
reducing clock speeds to save power in computers. The
device provides smooth, glitch-free frequency transitions so
that the CPU can continue to operate during slow down or
speed up. The rate of frequency change makes the ICS9131
compatible with all 386DX, 386SX, 486DX, 486DXZ, 486SX
and Pentium™ microprocessors.
•
Single 32.768 kHz crystal generates system clock and
selectable CPU clock
Generates CPU clocks from 8 MHz to 100 MHz.
Operates from 3.3V or 5.0V supply
Operates up to 66 MHz at 3.3V
Separate VDD for 32 kHz clock enables it to run from
battery
STOPCLK feature allows for a glitch-free turn-on and
Pen-turn-off of the CPU clock to static processors
Output enable tristates outputs
•
•
•
•
•
•
•
•
16-pin PDIP or SOIC package
Frequency selects allow for a smooth transition of
theCPUCLK
The ICS9131 is driven from a single 32.768 kHz crystal. The
only external components required are the crystal and a 10M
ohm resistor. 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
termination components.
Pin Configuration
VDD32 Supply
The ICS9131 has a separate power supply for the 32.768 kHz
oscillator circuitry. 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 and the main VDD at 0V.
The frequencies and power-down options in the ICS9131 are
mask programmable. Customer specific masks can be made
and prototypes delivered within 6-8 weeks from receipt of
order. ICS also offers standard versions, such as those de-
scribed in this data sheet.
16-Pin DIP or SOIC
Block Diagram
Pentium is a trademark of Intel.
9131 Rev B 052897P
ICS9131
Pin Descriptions
PIN NUMBER
1
PIN NAME
TYPE
DESCRIPTION
32 kHz
Output
32.768 kHz output.
Connect 32 kHz crystal, this input includes internal load
capacitor for crystal.
2
3
X2
Output
Input
Connect 32 kHz crystal, this input includes internal load
capacitor for crystal.
X1
4
5
VDD32
VCC
--
--
Power Supply for 32 kHz oscillator.
Power Supply.
6
VSS
--
Ground.
7
AGND
OE
--
Analog Ground.
8
Input
Input
Output
Input
--
OE tristates outputs when low.
CPU clock frequency select 2.
14.318 MHz output.
9
FS2
10
11
12
13
14
15
16
REFCLK
STOPCLK#
VSS
Stops CPU clock when low.
Ground.
VCC
--
Power supply.
CPUCLK
FS1
Output
Input
Input
CPU clock output (see Decoding table).
CPU clock frequency select 1.
CPU clock frequency select 0.
FS0
Functionality
FS2
FS1
FS0
CPUCLK
ACTUALS
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
16
25
33.3
40
50
60
16.004
25.059
33.412
40.095
50.119
60.142
66.484
80.190
66.6
80
2
ICS9131
Recommended External Circuit
Notes:
1) The external components shown should be placed as close to the device as possible.
2) Pins 5 and 13 should be connected together externally. One decoupling capacitor may suffice for both pins.
3
ICS9131
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 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
Operating VDD = +4.5V to +5.5V; TA =0°C to 70°C unless otherwise stated
DC Characteristics
PARAMETER
Input Low Voltage
SYMBOL
VIL
TEST CONDITIONS
MIN
TYP
-
MAX
0.8
-
UNITS
V
-
2.0
-15.0
-2.0
-
Input High Voltage
VIH
-
V
Input Low Current
IIL
VIN=0V
-6.0
-
µA
Input High Current
IIH
VIN=VDD
2.0
700
-
µA
Pull-up Resistor, Note 1
Output Low Current, Note 1
Output High Current, Note 1
Output Low Voltage
Rpu
VIN=VDD-1V
VOUT=0. 8V
VOUT=2.0V
400
45
k ohms
mA
mA
V
IOL
25
-
IOH
-53
0.15
3.7
18
-35
0.4
-
VOL
VOH
IDD
IOL=10mA
-
Output High Voltage, Note 1
Supply Current
IOH=-30mA
No load, at 50 MHz
2.4
-
V
35
mA
Output Frequency Change over
Supply and Temperature, Note 1
With respect to typical
frequency
Fd
-
-
0.002
12
0.05
25
%
Standby Supply Current, Note 2
IDDSTDBY
Unloaded
mA
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
Note 2: With the STOPCLK pin low (active).
Note 3: Absolute Jitter measured as the shortest and longest period difference to the mean period of the sample set.
4
ICS9131
Electrical Characteristics at 5V
Operating VDD = +4.5V to +5.5V; TA =0°C to 70°C unless otherwise stated
AC Characteristics
PARAMETER
Output Frequency, Note 1
Input Frequency, Note 1
Output Rise time, Note 1
Rise time, Note 1
SYMBOL
TEST CONDITIONS
Clock1
MIN
TYP
-
MAX
UNITS
MHz
kHz
ns
fo
fi
tr
12.0
100
38
2.0
-
32
15pF load, 0.8 to 2.0V
15pF load, 20% to 80% VDD
15pF load, 2.0 to 0.8V
15pF load, 80% to 20% VDD
15pF load @1.4V
0.60
1.6
0.50
0.9
50
1.4
3.0
1.2
2.5
55
tr
-
ns
Output Fall time, Note 1
Fall time, Note 1
tf
-
ns
tf
-
ns
Duty cycle, Note 1
dt
45
%
Jitter, 1 sigma from 33-80 MHz,
Note 1
Tjis
Tjabs
Tjis
10,000 samples
10,000 samples
10,000 samples
10,000 samples
10,000 samples
10,000 samples
-
50
-
150
250
150
600
3
ps
ps
ps
ps
%
%
Jitter, Absolute from 33-80 MHz,
Notes 1, 3
-250
Jitter, 1 sigma from 16-25 MHz,
Note 1
60
-
Jitter, Absolute from 16-25 MHz,
Note 1, 3
Tjabs
Tjis
-600
Jitter, 1 sigma from 14 to below,
Note 1
-
-
1
Jitter, Absolute from 14 to below,
Note 1, 3
Tjabs
2
5
Frequency Transition time, Note 1
Power-up time, Note 1
tft
2.0
3.0
5.0
7.5
10.0
15
ms
ms
tpu
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
Note 2: With the STOPCLK pin low (active).
Note 3: Absolute Jitter measured as the shortest and longest period difference to the mean period of the sample set.
5
ICS9131
Electrical Characteristics at 3.3V
Operating VDD = +3.3V to +3.7V; TA =0°C to 70°C unless otherwise stated
DC Characteristics
PARAMETER
Input Low Voltage
SYMBOL
VIL
TEST CONDITIONS
MIN
TYP
MAX
0.2 VDD
-
UNITS
V
-
-
Input High Voltage
VIH
0.7 VDD
-
-2.5
V
Input Low Current
IIL
VIN=0V
-7.0
µA
Input High Current
IIH
VIN=VDD
-2.0
-
2.0
µA
Pull-up Resistor, Note 1
Output Low Current, Note 1
Output High Current, Note 1
Output Low Voltage, Note 1
Output High Voltage, Note 1
Supply Current
Rpu
VIN=VDD-1V
VOUT=0.2V
-
600
900
k ohms
mA
mA
V
IOL
15
24
-
IOH
VOUT=0.7V
-
-13
-8
VOL
VOH
IDD
IOL=60mA
-
0.05 VDD
0.94 VDD
13
0.1 VDD
IOH=-4.0mA
No load, at 50 MHz
6.85 VDD
-
-
V
25
mA
Output Frequency Change over
Supply and Temperature, Note 1
With respect to typical
frequency
Fd
-
-
0.002
8
0.05
15
%
Standby Supply Current, Note 2
IDDSTDBY
No load
mA
AC Characteristics
Clock1
Output Frequency, Note 1
Input Frequency, Note 1
Rise time, Note 1
fo
fi
12.0
-
100
38
MHz
kHz
ns
2.0
32
2.2
1.2
-
tr
15pF load, 20% to 80% VDD
15pF load, 80% to 20% VDD
15pF load @50% VDD
10,000 samples
-
3.5
2.5
53
Fall time, Note 1
tf
-
ns
Duty cycle, Note 1
dt
43
%
Jitter, 1 sigma , Note 1
Tjis
Tjabs
Tjis
Tjabs
Tjis
Tjabs
tft
-
50
150
250
150
600
3
ps
Jitter, Absolute, Note 1, 3
Jitter, 1 sigma from 16-25 MHz
Jitter, Absolute from 16-25 MHz
Jitter, 1 sigma from 14 to below
Jitter, Absolute from 14 to below
Frequency Transition time, Note 1
Power-up time, Note 1
10,000 samples
-250
ps
10,000 samples
-
60
-
ps
10,000 samples
-600
ps
10,000 samples
-
-
1
%
10,000 samples
2
5
%
6.7
8.55
14.0
17.0
ms
ms
tpu
-
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
Note 2: With the STOPCLK pin low (active).
Note 3: Absolute Jitter measured as the shortest and longest period difference to the mean period of the sample set.
6
ICS9131
Stop Clock Feature
The ICS9131 incorporates a unique stop clock feature
compat-ible with static logic processors. When the stop
clock pin goes low, the CPUCLK will go low after the next
occuring falling edge. When STOPCLK again goes high,
CPUCLK resumes on the next rising edge of the internal
clock. This feature enables fast, glitch-free starts and stops
of the CPUCLK and is useful in Energy Star motherboard
applications.
32 kHz Supply Current
ADVANCE INFORMATION documents contain information on new products in the
sampling or preproduction phase of development. Characteristic data and other
specifications are subject to change without notice.
7
ICS9131
16-Pin DIP Package
16-Pin SOIC Package
Ordering Information
ICS9131-01CN16 or ICS9131-01CS16
Example:
ICS XXXX M X#W
Lead Count & Package Width
Lead Count=1, 2 or 3 digits
W=.3” SOIC or .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
8
相关型号：
ICS9131-01CS16WLF
Processor Specific Clock Generator, 80.19MHz, CMOS, PDSO16, 0.300 INCH, SOIC-16
IDT
©2020 ICPDF网 联系我们和版权申明