ICST ICS9169A-70 Frequency generator for workstation system Datasheet

Integrated
Circuit
Systems, Inc.
ICS9169A-70
Frequency Generator for Workstation Systems
General Description
Features
The ICS9169A-70 is a low-cost frequency generator designed
specifically for workstation or PC system clocks. The
integrated buffer minimizes skew and provides all the clocks
required. A 14.318 MHz XTAL oscillator provides the
reference clock to generate standard Pentium frequencies.
The CPU clock makes gradual frequency transitions without
violating the PLL timing of internal microprocessor clock
multipliers.
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9 PCI outputs selectable from 30 to 66.6MHz
3 SCSI outputs, selectable from 10 to 80MHz
500ps skew window for all synchronous clock edges
Integrated buffer outputs drive up to 30pF loads
500ps output to output skew window
Buffers drive 30pF loads nominally 0.8V/ns skew rate
3.0V - 3.7Vsupply range
32-pin SOIC package
48 MHz clock for USB support and 24 MHz clock
for FD
Pin Configuration
Block Diagram
32-Pin SOIC
9169A-70 Rev B 2/14/01
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.
ICS9169A-70
Pin Descriptions
PIN NUMBER
PIN NAME
TYPE
DESCRIPTION
PWR
Power for logic, PLL and output buffers.
XTAL or external reference frequency input. This
input includes XTAL load capacitance and feedback
bias for a 12-16 MHz crystal, nominally 14.31818
Mhz.
XTAL output which includes XTAL load
capacitance.
PCI clock outputs
Ground for logic, PLL and output buffers.
Power for PCI clock outputs
Frequency multiplier select pins. See table above.
These inputs have internal pull up devices.
1
VDD1
2
X1
IN
3
X2
OUT
5,6,9,10,13,14,20,23,24
4,7,11,19,22,25
8,12,21
PCI(0:8)
GND
VDD3
OUT
PWR
PWR
15,16,17
FS(0:2)A
IN
29
VDD2
PWR
Power for SCSI clock outputs
28,27,26
SCSI (0:2)
OUT
SCSI clock outputs
31,30,18
FS(0:2)B
IN
32
REF0
Frequency multiplier select pins. See table next
page. These inputs have internal pull up devices
REF is a buffered copy of the crystal oscillator or
reference input clock, nominally 14.31818 MHz.
OUT
Note:
X1, X2 contain iternal 18pF crystal load cap. Intended to have external load
caps of 15 to 18pF required for nominal crystal of 17 to 18pF crystal total load.
2
ICS9169A-70
VDD = 3.3±10%, TA = 0 to 70°C
Crystal = 14.31818MHz
SCSI outputs: SCSI(0:2)
(Assume divide by 2 from VCO)
FS2B
FS1B
FS0B
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Target
MHz
24
48
10
20
40
50
60
80
Actual
MHz
24
48.07
10.02
20.05
40.09
50.11
60.14
80.18
REF
MHz
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
PCI outputs: PCI (0:8)
(Assume divide by 2 from VCO)
FS2A
FS1A
FS0A
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Target
MHz
Tristate
REF/2
30
33.3
50
55
60
66.6
Actual
REF
MHz
MHz
Tristate Tristate
REF/2
REF
30.07
14.318
33.27
14.318
50.11
14.318
54.89
14.318
60.14
14.318
66.63
14.318
Note: When FS(0:2)A is 000 or 001, the Tristate and
Test modes applies to all outputs for REF, PCI, and
SCSI outputs.
FS2A
FS1A
FS0A
PCI
SCSI
0
0
0
0
0
1
Tristate
REF/21
Tristate
REF/21
REF
Tristate
REF1
Note: 1. In Test mode, each PLL is bypassed. The clock
signal at X1 (externally driven clock or the
crystal) is applied to the divider circuits.
3
ICS9169A-70
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 - Input/Supply/Common Output Parameters
TA = 0 - 70C; Supply Voltage VDD = 3.3 V +/-10% (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
Input High Voltage
VIH
Input Low Voltage
VIL
VIN = VDD
Input High Current
IIH1
VIN = 0 V
Input Low Current
IIL1
CL = 0 pF; Select @ 66M
Supply Current
IDD
Input frequency
Fi
VDD = 3.3 V;
Input Capacitance1
Transition Time1
Settling Time
MAX
0.9
5
110
UNITS
V
V
mA
mA
mA
MHz
27.0
36.0
5
45.0
pF
pF
Logic Inputs
X1 & X2 pins
Ttrans
To 1st crossing of target Freq.
0.136
2.0
mS
From 1st crossing to 1% target Freq.
63.0
600
µS
1.7
4.0
MHz
3
mS
Ts
Clock Overshoot
Clk Stabilization1
TYP
0.2
-50.0
50
14.318
CIN
CINX
1
1
MIN
2.0
-5
-20
Tsh
TSTAB
From VDD = 3.3 V to 1% target Freq.
1
Guarenteed by design, not 100% tested in production.
Electrical Characteristics - REF
TA = 0 - 70C; VDD = VDDL = 3.3 V +/-10%; CL = 20 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
Duty Cycle
Jitter
1
SYMBOL
VOH1
VOL1
IOH1
IOL1
CONDITIONS
IOH = -14 mA
IOL = 11 mA
VOH = 2.0 V
VOL = 0.8 V
MIN
2.4
20.0
TYP
2.9
0.3
-43.0
31.0
MAX UNITS
V
0.4
V
23.0
mA
mA
tr5
1
VOL = 0.8 V, VOH = 2.4 V
0.7
1.5
nS
tf5
1
VOH = 2.4 V, VOL = 0.8 V
0.6
1.5
nS
1
VT = 1.5 V
40
53
60
%
VT = 1.5 V
VT = 1.5 V
-
182
400
pS
-700
-
700
pS
dt5
1
tj1s5
tjabs5 1
Guarenteed by design, not 100% tested in production.
4
ICS9169A-70
Electrical Characteristics - SCSI
TA = 0 - 70C; VDD = VDDL = 3.3 V +/-10%; CL = 20 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
Duty Cycle
Skew (window)
Jitter
SYMBOL
VOH1
VOL1
IOH1
IOL1
tr5
tf5
1
1
dt5
1
tsk1
1
tj1s5
tj1s5
1
1
tjabs5
tjabs5
1
1
1
CONDITIONS
IOH = -14 mA
IOL = 11 mA
VOH = 2.0 V
VOL = 0.8 V
MIN
2.4
20.0
TYP
2.9
0.3
-43.0
31.0
MAX UNITS
V
0.4
V
23.0
mA
mA
VOL = 0.8 V, VOH = 2.4 V
0.7
1.5
nS
VOH = 2.4 V, VOL = 0.8 V
0.6
1.5
nS
VT = 1.5 V
45
50
55
%
VT = 1.4 V
-250
-
250
pS
VT = 1.5 V; Rs= 33; (10 to 24 MHz Clocks)
-
200
300
pS
VT = 1.5 V; Rs= 33; (40 to 80 MHz Clocks)
-
90
150
pS
VT = 1.5 V; Rs= 33; (10 to 24 MHz Clocks)
-700
-
700
VT = 1.5 V; Rs= 33; (40 to 80 MHz Clocks)
-400
-
400
MIN
2.4
TYP
2.9
0.3
-43.0
31.0
pS
Guarenteed by design, not 100% tested in production.
Electrical Characteristics - PCI
TA = 0 - 70C; VDD = 3.3 V +/-10%; CL = 30 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
Duty Cycle
Skew (window)
Jitter
SYMBOL
VOH1
VOL1
IOH1
IOL1
tr1
tf1
1
1
dt1
1
tsk1
1
tj1s1
1
tjabs1
1
1
CONDITIONS
IOH = -14 mA
IOL = 11 mA
VOH = 2.0 V
VOL = 0.8 V
20.0
MAX UNITS
V
0.4
V
23.0
mA
mA
VOL = 0.8 V, VOH = 2.4 V
0.8
1.5
nS
VOH = 2.4 V, VOL = 0.8 V
0.9
1.5
nS
51.0
55.0
%
250
pS
150
pS
300
pS
VT = 1.4 V
45.0
VT = 1.4 V
-250
VT = 1.5 V; Rs= 33
88
VT = 1.5 V; Rs= 33
-300
Guarenteed by design, not 100% tested in production.
5
ICS9169A-70
General Layout Precautions:
1) Use a ground plane on the top layer
of the PCB in all areas not used by
traces.
2) Make all power traces and vias as
wide as possible to lower inductance.
Notes:
1 All clock outputs should have series
terminating resistor. Not shown in all
places to improve readibility of
diagram
2 Optional EMI capacitor should be
used on all CPU, SDRAM, and PCI
outputs.
3 Optional crystal load capacitors are
recommended.
Capacitor Values:
C1, C2 : Crystal load values determined by user
All unmarked capacitors are 0.01µF ceramic
6
ICS9169A-70
SOIC Package
LEAD COUNT
DIMENSONL
32L
.804
Ordering Information
ICS9169AM-70
Example:
ICS XXXX M - PPP
Pattern Number (2 or 3 digit number for parts with ROM code patterns)
Package Type
M=SOIC
Device Type (consists of 3 or 4 digit numbers)
Prefix
ICS, AV = Standard Device
7
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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