ICST ICS9147F-16 Frequency generator & integrated buffers for pentiumtm Datasheet

Integrated
Circuit
Systems, Inc.
ICS9147-16
Frequency Generator & Integrated Buffers for PENTIUMTM
General Description
Features
The ICS9147-16 generates all clocks required for high
speed RISC or CISC microprocessor systems such as Intel
PentiumPro. Two different reference frequency multiplying
factors are externally selectable with smooth frequency
transitions. Glitch-free Stop clock control is provided for
CPU and BUS clocks. Complete chip low current mode is
achieved with the Power Down# pin.
•
High drive BUS outputs typically provide greater than 1 V/
ns slew rate into 30 pF loads. CPU outputs typically provide
better than 1V/ns slew rate into 20 pF loads while
maintaining 50± 5% duty cycle. The REF and IOAPIC clock
outputs typically provide better than 0.5V/ns slew rates.
Separate buffer supply pins VDDL allow for nominal 3.3V
voltage or reduced voltage swing (from 2.9 to 2.5V) for
CPU (1:4) and IOAPIC outputs.
•
•
•
•
•
•
Generates four processor, eight bus, four 14.31818
MHz, two 48 MHz clocks for USB support.
CPU to BUS clock skew 1 to 4ns (CPU early)
Synchronous clocks skew matched to 250ps window on
CPU and 500ps window on BUS.
Selectable multiplying ratios
Glitch free stop clock controls CPUEN and BUSEN
3.0V – 3.7V supply range, 2.5V to VDD supply range for
CPU (1:4) clocks and IOAPIC clock.
48-pin SSOP package
Pin Configuration
Block Diagram
48-Pin SSOP
Pentium is a trademark of Intel Corporation
9147-16 Rev A 072897P
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.
ICS9147-16
Functionality
Tristate
REF
IOAPIC
Tristate
48
(MHz)
Tristate
60
30
14.31818
48
0
66.6
33.3
14.31818
48
1
1
REF/2
REF/4
REF
REF/2
0
X
X
LOW
Running
14.31818
48
0
1
X
X
Running
LOW
14.31818
48
X
X
X
X
LOW
LOW
LOW
LOW
PD#
BUSEN
CPUEN
FS1
FS0
CPU (1:4)
BUS
1
1
1
0
0
Tristate
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
0
Pin Descriptions
PIN NUMBER
PIN NAME
1, 2, 47
REF1, REF2, REF3
3, 10, 18, 24, 30, 32,
GND
37, 43, 44
TYPE
OUT
DESCRIPTION
14.318 MHz reference clock outputs.
PWR
Ground.
4
X1
IN
5
8, 9, 11, 12, 13, 14,
16, 17
26, 27
7, 15, 21, 25, 34, 48
X2
OUT
Crystal input, has internal crystal load capacitor, and feedback resistor
from X2. Nominally 14.31818MHz.
Crystal output, has internal crystal load capacitor
BUS (1:8)
OUT
BUS clock outputs, operates synchronously at CPU/2.
FS (0:1)
VDD3
IN
PWR
Select pin for enabling CPU and BUS clock frequencies.*
Core and Buffer output clock power supply.
48M (1:2)
OUT
48 MHz clock output
Device power down input, stops outputs low and shuts off crystal
oscillator and PLLs when low.*
Output enable for all CPU clocks, a logic low will Stop low all CPU
clocks.*
CPU clock output clocks, operates at VDDL supply voltage (with
IOAPIC), either nominal 3.3V VDD or reduced voltage 2.9 to 2.5V.
Output enable for all BUS clock, a logic low will stop Low all Bus
clocks.*
IOAPIC clock output. (14.318 MHz), operates at VDDL supply voltage
with CPU (1:4), either nominal 3.3V VDD or reduced voltage
2.9 to 2.5V.
Power supply for CPU and IOAPIC block buffers, operates at nominal
3.3V VDD or reduced voltage 2.9 to 2.5V.
No connection internally to these pins.
22, 23
28
PD#
IN
29
CPUEN
IN
38, 39, 41, 42
CPU (1:4)
OUT
6
BUSEN
IN
45
IOAPIC
OUT
VDDL
PWR
40, 46
19, 20, 31, 33, 36
N/C
-
* Has internal pull-up to VDD3.
2
ICS9147-16
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
VDDL=VDD3=3.0 – 3.7 V, TA = 0 – 70° C unless otherwise stated
DC Characteristics
PARAMETER
Input Low Voltage
Input High Voltage
Input Low Current
Input High Current
SYMBOL
VIL
VIH
IIL
IIH
Output Low Current
IOL1
IOH1a
Output High Current
IOH1b
Output Low Current
Output High Current
IOL2
IOH2
Output Low Current
IOL3
IOH3a
Output High Current
IOH3b
Output Low Voltage
Output High Voltage
VOL1
VOH1
Output Low Voltage
Output High Voltage
VOL2
VOH2
Output Low Voltage
VOL3
Output High Voltage
VOH3
Supply Current
Supply Current
IDD
IDDPD
TEST CONDITIONS
VIN = 0V
VIN = VDD
VOL = 0.8V;
for BUS & REF1
(and CPU & IOAPIC at VDDL= 3.0
to 3.7V)
VOH = 2.0V;
for BUS & REF1
(and IOAPIC at VDDL = 3.0 to 3.7V)
VOH = 2.0V; for CPU @
VDDL = 3.0 to 3.7V
VOL = 0.8V; REF (2:3), 48 CLKs
VOH = 2.0V; REF (2:3), 48 CLKs
VOL=0.8V; for CPU at
VDDL = 2.5V
VOH = 2.0V; for CPU at
VDDL = 2.5V
VOH = 2.0V; for IOAPIC @
VDDL = 2.5V
IOL = 10mA;
for BUS & REF1
(and CPU at VDDL = 3.0 to 3.7V)
IOH = -10mA;
for BUS & REF1
(and CPU at VDDL = 3.0 to 3.7V)
IOL = 4mA; REF (2:3), 48 CLKs
IOH = -4mA; REF (2:3), 48 CLKs
IOL = 8mA; for CPU at
VDDL = 2.5V
IOH = -8mA; for CPU at
VDDL = 2.5V
@66.6 MHz; all outputs unloaded
PD# = Low
MIN
0.7VDD
-28.0
-5.0
TYP
-10.5
-
MAX
0.2VDD
5.0
UNITS
V
V
µA
µA
19.0
30.0
-
mA
-
-28.0
-16.0
mA
-45.0
-27.0
mA
8.0
-
13.0
-11.0
-7.0
mA
mA
19.0
30.0
-
mA
-
-12.5
-9.5
mA
-13.0
-10.0
mA
-
0.22
0.4
V
2.4
2.8
-
V
2.4
0.25
2.6
0.4
-
V
V
-
0.25
0.4
V
2.1
2.25
-
V
-
70
230
140
500
mA
µA
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
3
ICS9147-16
Electrical Characteristics at 3.3V
VDDL=VDD3=3.0 – 3.7 V, TA = 0 – 70° C unless otherwise stated
AC Characteristics
PARAMETER
Rise Time1
Fall Time1
SYMBOL
Tr1a
Tf1a
Rise Time1
Tr1b
Fall Time1
Tf1b
Rise Time1
Tr2
Fall Time1
Tf2
Rise Time1
Tr3
Fall Time1
Tf3
Rise Time1
Tr4
Fall Time1
Tf4
1
Dt1
Duty Cycle1
Dt2
Jitter, One Sigma1
Tjis1
Jitter, Absolute1
Tjab1
Duty Cycle
1
Jitter, One Sigma
Jitter, Absolute1
Input Frequency1
Logic Input Capacitance1
Oscillator Input Capacitance 1
Power-on Time1
Tjis2
Tjab2
Fi
CIN
CINX
ton
Clock Skew1
Tsk1
1
Tsk2
Clock Skew1
Tsk3
Clock Skew1
Tsk4
Tsk5
Clock Skew
TEST CONDITIONS
20pF load, 0.8 to 2.0V CPU
20pF load, 2.0 to 0.8V CPU
CL=20pF, VDD=2.5V
0.8 to 2.0V CPU
CL=20pF, VDD=2.5V
2.0 to 0.8V CPU
30pF load, 0.8 to 2.0V
BUS & REF1
30pF load, 2.0 to 0.8V
BUS & REF1
20pF load, 0.8 to 2.0V
48 clock & REF (2:3)
20pF load, 2.0 to 0.8V
48 clock & REF (2:3)
20pF load, 0.8 to 2.0V , IOAPIC with
VDDL = 2.5V
20pF load, 2.0 to 0.8V, IOAPIC with
VDDL = 2.5V
20pF load @ VOUT=1.4V
REF (1:3) Load = 20pF REF 2, 3
Load = 47pF REF1
CPU & Fixed BUS Load=20pF,
BUS; Load = 30pF
CPU & Fixed BUS Load=20pF,
BUS; Load = 30pF
REF1; Load = 47pF
REF1; Load = 47pF
Logic input pins
X1, X2 pins
From VDD=3.0V to 1st crossing of
66.6 MHz VDD supply ramp < 1 ms
CPU to CPU; Load=20pF; @1.4V
(Same VDD)
BUS to BUS; Load=20pF; @1.4V
CPU to BUS; Load=20pF; @1.4V
(CPU is early) (All at 3.3V)
CPU @ 2.5V to BUS @ 3.3V
REF @ 3.3V to IOAPIC @ 2.5V
MIN
-
TYP
0.9
0.8
MAX
1.2
1.2
UNITS
ns
ns
-
1.0
1.2
ns
-
1.0
1.2
ns
-
0.9
1.6
ns
-
0.8
1.5
ns
-
1.4
2.4
ns
-
1.8
2.4
ns
-
-
1.6
ns
-
-
1.6
ns
45
50
55
%
40
45
50
%
-
50
150
ps
-250
-
250
ps
-500
12.0
-
55
200
14.318
5
18
250
500
16.0
-
ps
ps
MHz
pF
pF
-
1.5
3.0
ms
-
150
250
ps
-
300
500
ps
1
3.3
4
ns
4
1.5
ns
ns
1
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
4
ICS9147-16
Recommended PCB Layout for ICS9147-16
NOTE:
This PCB Layout is based on a 4 layer board with an internal Ground (common) and Vcc plane. Placement of
components will depend on routing of signal trace. The 0.1uf Capacitors should be placed as close as possible
to the Power pins. Placement on the backside of the board is also possible. The Ferrite Beads can be replaced
with 10-15ohm Resistors. For best results, use a Fixed Voltage Regulator between the main (board) Vcc and the
different Vdd planes.
5
ICS9147-16
SSOP Package
SYMBOL
A
A1
A2
B
C
D
E
e
H
h
L
N
∝
X
COMMON DIMENSIONS
MIN.
NOM.
MAX.
.095
.101
.110
.008
.012
.016
.088
.090
.092
.008
.010
.0135
.005
.010
See Variations
.292
.296
.299
0.025 BSC
.400
.406
.410
.010
.013
.016
.024
.032
.040
See Variations
0°
5°
8°
.085
.093
.100
VARIATIONS
AC
MIN.
.620
D
NOM.
.625
N
MAX.
.630
48
Ordering Information
ICS9147F-16
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 = 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.
Similar pages