ICST ICS9169CF-40 System clock chip Datasheet

Integrated
Circuit
Systems, Inc.
ICS9169C-40
System Clock Chip
General Description
Features
The ICS9169C-40 is a Clock Synthesizer chip for Pentium or
Cyrix CPU based motherboards using PCI.
•
•
•
•
Features include eight CPU clocks and six PCI clocks. A
Reference Output is available equal to the crystal frequency.
The device meets the Pentium power-up stabilization, which
requires that CPU and PCI clocks be stable within 2ms after
power-up.
The ICS9169C-40 clock output are designed for low EMI
emissions. Controlled rise and fall times, unique output
driver circuits and innovative circuit layout techniques enable
the ICS9169C-40 to have lower EMI than other clock
devices.
•
•
•
•
•
•
8 selectable CPU clocks up to 75MHz
Six synchronous PCI clocks
One Referance Clock at 14.318MHz
Power-up stabilization time = 2ms on all CPU and PCI
clocks, which meets Intel PentiumPro power-up
Low CPU and PCI clock jitter <500ps
Low skew output
Improved output drivers are designed for low EMI
Test Mode
Optional common or mixed supply mode:
(VDD = VDDL1 =VDDL2 = 3.3V)
(VDD = 3.3V, VDDL1=VDDL2 = 2.5)
(VDD = 3.3V, VDDL1 = 3.3V, VDDL2 = 2.5V)
Space saving and low cost 34-pin SSOP package
The ICS9169C-40 accepts a 14.318MHz reference crystal or
clock as its input and runs from a 3.3V supply.
Pin Configuration
Block Diagram
34-Pin SSOP
Functionality
3.3V±10%, 0-70°C
Crystal (X1, X2) = 14.31818 MHz
Pentium is a trademark on Intel Corporation.
9169C-40RevA072897P
FS2
FS1
FS0
CPU
PCI
0
0
0
50MHz
33.3MHz
0
0
1
55MHz
36.67MHz
0
1
0
REF/2
REF/4
0
1
1
75MHz
37.5MHz
1
0
0
50MHz
25MHz
1
0
1
55MHz
27.6MHz
1
1
0
60MHz
30MHz
1
1
1
66.6MHz
33.3MHz
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 information being relied upon by the
customer is current and accurate.
ICS169C-40
Pin Descriptions
PIN NUMBER
PIN NAME
TYPE
DESCRIPTION
1, 9
VDD
PWR
Power supply
2
REF
OUT
Buffered output reference. 3.3V
3, 5, 18, 26, 32
GND
PWR
Digital Ground.
4
N/C
-
Not connected.
6, 7, 8, 10, 11, 12
PCI (1:6)
OUT
13, 19, 20
FS (0:2)
IN
Frequency select inputs, these inputs have internal pull-ups.
Input for tristate. If PD# = 0, then all outputs are tristated and
the device is in shutdown mode (VCO’s off, crystal oscillator
is off and all logic is reset) When PD# = 1, the device is in
normal operating mode. Has internal pull-up
Clock outputs - controlled by 3.3V V DD
14
PD#
IN
15
AGND
PWR
Analog Ground
16
N/C
-
Not connected
17
AVDD
PWR
Analog Power Supply
21
VDDL1
PWR
3.3/2.5V Power Supply for CPU (1:4)
22, 23, 24, 25, 27, 28, 29, 30
CPU (1:8)
OUT
Clock outputs.
31
VDDL2
PWR
3.3/2.5V Power Supply for CPU (5:8)
33
X2
OUT
Reference oscillator
34
X1
IN
Reference oscillator
2
ICS169C-40
Absolute Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND –0.5 V to VDD +0.5 V
Ambient Operating Temperature . . . . . . . . . . . . 0°C to +70°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are
stress specifications only and functional operation of the device at these or any other conditions above those listed 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 3.3V
VDD = 3.0 – 3.7 V, TA = 0 – 70° C unless otherwise stated
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
-50.0
25.0
50
µA
Input High Current
IIH
VIN=VDD
-5.0
-
5.0
µA
Output Low Voltage1
VOL
IOL=12mA; for CPU, PCI
-
0.3
0.4
V
Output High Voltage1
VOH
IOH=-12mA; for CPU, PCI
2.4
2.8
-
V
Output Low Voltage1
VOL
IOL=7.5mA; for Ref CLK
-
0.3
0.4
V
Output High Voltage1
VOH
IOH=-15mA; for Ref CLK
2.4
2.8
-
V
Output Low Voltage1
VOL
IOL=7.5mA: CPU only;
VDDL (1:2) = 2.5V
-
0.3
0.4
V
Output High Voltage1
VOH
IOH=-13mA; CPU only;
VDDL (1:2) = 2.5V
2.0
2.2
-
V
Supply Current
IDD
@66.6 MHz; all outputs unloaded
-
35
65
mA
PD#=0
All Logic Inputs to VDD
-
244
500
µA
Other
All Logic Inputs to GND
-
371
700
µA
Power Down Current
IDD(PD)
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
3
ICS169C-40
Electrical Characteristics at 3.3V
VDD = 3.0 – 3.7 V, TA = 0 – 70° C unless otherwise stated
AC Characteristics
PARAMETER
SYMBOL
Rise Time1
Tr1
Fall Time1
Tf1
Rise Time1
Tr2
Fall Time1
Tf2
Duty Cycle1
Dt
Duty Cycle1
Dt
Jitter, One Sigma1
Tj1s1
Jitter, Absolute1
Tjab1
Jitter, One Sigma1
Tj1s2
Jitter, Absolute1
Tjab2
Jitter, Cycle to Cycle
(for CPU only)
Input Frequency1
Logic Input Capacitance1
TCC
MIN
TYP
MAX
UNITS
-
0.9
1.4
ns
-
0.8
1.2
ns
-
1.5
2.0
ns
-
1.4
2.0
ns
45
50
55
%
45
49
55
%
-
50
150
ps
-220
-
220
ps
-
200
300
ps
Ref Load=15pF
-500
-
500
ps
VDD=VDDL; @ 60MHz
-400
-
+400
ps
VDD=VDDL; @ 66MHz
-350
-
350
ps
VDD=VDDL; @ 75MHz
-250
-
250
ps
VDD=3.3V; VDDL=2.5;
for All Frequencies
400
-
400
ps
12.0
14.318
16.0
MHz
Logic input pins
-
5
-
pF
X1, X2 pins
-
18
-
pF
-
2.5
4.5
ms
-
1.8
2.0
ms
-250
14.5
250
ps
1.0
2.0
4.0
ns
0.50
1.5
3.0
ns
15pF load, 0.4 to 2.0V; VDD=VDDL
for All Outputs
15pF load, 2.0 to 0.4V; VDD=VDDL
for All Outputs
15pF load, 0.4 to 2.0V; VDDL=2.5V &
VDD = 2.3V; CPU
15pF load, 2.0 to 0.4V; VDDL=2.5V &
VDD = 3.3V; CPU
15pF load CPU, PCI, REF @
VOUT=1.5V
15pF load; VDDL (1:2)=2.5V
VTH=1.25V
CPU & PCI Clocks; Load=15pF,
VDD=VDDL
CPU & PCI Clocks; Load=15pF,
VDD=VDDL
Ref; Load=15pF
Fi
CIN
Crystal Oscillator
Capacitance1
CINX
Power-on Time1
ton
Frequency Settling Time1
TEST CONDITIONS
ts
Clock Skew Window1
Tsk1
Clock Skew1
Tsk2
Clock Skew1
Tsk3
From VDD=1.6V to 1st crossing of 66.6
MHz VDD supply ramp < 40ms
From 1st crossing of acquisition to <
1% settling
CPU to CPU & PCI to PCI; Load=15pF;
@1.5V
CPU to PCI; Load=15pF; @1.5V;
VDD=VDDL; CPU is early
CPU to PCI; Load=15pF; (CPU is early)
VDDL=2.5V, VTH=1.25V;
VDD=3.3V, VTH=1.5V
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
4
ICS169C-40
Technical Pin Function Descriptions
VDD/AVDD
This is the power supply to the internal logic of the device as
well as the following clock output buffers:
FS0, FS1, FS2
These pins control the frequency of the clocks at the CPU,
PCI pins. See the Funtionality table at the beginning of this
data sheet for a list of the specific frequencies, and the
selection codes that are necessary to produce these
frequencies. The device reads these pins at power-up. If a
"1" value is desired for a specific frequency selection bit,a
10K ohm restor must be connected from the apporapriate FS
pin to the VDD supply. If a "0" value is desired, then the 10K
resistor must be connected to ground.
• PCI (1:6)
• REF
This pin may be operated at any voltage between 3.0 and 5.5
volts. Clocks from the listed buffers that it supplies will
have a voltage swing from ground to this level. For the
actual guaranteed high and low voltage levels of these clocks,
please consult the AC parameter table in this data sheet.
GND/AGND
This is the power supply ground return pin for the chip.
REF
This is a fixed frequency clock that runs at the same frequency
as the input reference clock (typically 14.31818 MHz) is and
typically used to drive Video and ISA BUS requirements.
XIN
This pin serves one of two functions. When the device is
used with a crystal, XIN acts as the input pin for the reference
signal that comes from the discrete crystal. When the device
is driven by an external clock signal, XIN is the device’
input pin for that reference clock. This pin also implements
an internal crystal loading capacitor that is connected to
ground. See the data tables for the value of the capacitor.
VDDL (1:2)
This is the power supply to the CPU clock drivers. This pin
may be operated "at any voltage" between 2.5 and 3.3 volts.
Clocks from the buffers that it supplies will have a voltage
swing form ground to this level. For the actual guaranteed
high and low voltage levels of these clocks. Please consult
the AC parameter table in this data sheet.
XOUT
This pin is used only when the device uses a Crystal as the
reference frequency source. In this mode of operation, XOUT
is an output signal that drives (or excites) the discrete crystal.
This pin also implements an internal crystal loading capacitor
that is connected to ground. See the data tables for the value
of the capacitor.
CPU (1:8)
These pins are the clock outputs that drive processor and
other CPU related circuitry that require clocks which are in
tight skew tolerance with the CPU clock. The voltage swing
of these clocks is controlled by that which is applied to the
VDDL (1:2) pin of the device. See the Functionality table at
the beginning of this data sheet for a list of the specific
frequencies that this clock operates at and the selection
codes that are necessary to produce these frequencies.
PCI (1:6)
Outputs for PCI bus with a skew ≤ 250pS. A high current rate
of 60mA is available at 3.3V. These outputs are supplied from
VDD.
5
ICS169C-40
SSOP Package
SYMBOL
A
A1
A2
B
C
D
E
e
H
h
L
N
∝
X
COMMON DIMENSIONS
MIN.
NOM.
MAX.
.097
.101
.104
.005
.009
.0115
.090
.092
.094
.014
.016
.019
.0091
.010
.0125
See Variations
.292
.296
.299
.040 BSC
.400
.406
.410
.010
.013
.016
.024
.032
.040
See Variations
0°
5°
8°
.085
.093
.100
VARIATIONS
AA
MIN.
.701
D
NOM.
.706
N
MAX.
.711
34
Dimensions are in Inches
Ordering Information
ICS9169CF-40
Example:
ICS XXXX F - PPP
Pattern Number (2 or 3 digit number for parts with ROM code patterns)
Package Type
F=SSOP
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 information being relied upon by the
customer is current and accurate.
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