ICST ICS9147F-14 Datasheet
Integrated
Circuit
Systems, Inc.
ICS9147-14
Frequency Generator & Integrated Buffers for PENTIUM/Pro
General Description Features
The ICS9147-14 generates all clocks required for high speed
RISC or CISC microprocessor systems such as Intel
PentiumPro. Two bidirectional I/O pins (FS1,FS2) are latched
at power-on to the functionality table, with FS0 selectable in
real-time to toggle between conditions.
High drive PCICLK and SDRAM 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 20pF loads
while maintaining
typically provide better than 0.5V/ns slew rates. Seperate
buffers supply pins VDDL1 allow for 3.3V or reduced voltage
swing (from 2.9 to 2.5V) for CPU (0:3) and IOAPIC outputs.
50 ±
5% duty cycle. The REF clock outputs
Block Diagram
Four copies of CPU clock
Twelve SDRAM (3.3 V TTL), usable as AGP clocks
Seven copies of PCICLK clock (synchronous with CPU
clock/2 or CPU/2.5 for 75 and 83.3 MHz CPU)
CPU clocks to PCICLK clocks skew 1-4ns, center 2.6ns.
One IOAPIC clock @14.31818 MHz
Two copies of Ref. clock @14.31818 MHz
Ref. 14.31818 MHz Xtal oscillator input
Separate V
buffers to allow 2.5V output (or Std. Vdd)
One each 48/ 24 M Hz (3.3 V TT L)
3.3V outputs: SDRAM, PCI, REF, 48/24MHz.
2.5V or 3.3V outputs: CPU, IOAPIC.
20 ohm CPU clock output impedance
20 ohm PCI clock output impedance
1.5ns rise time (30 pF loading)
±250 ps CPU, PCI clock skew
350ps (cycle by cycle) CPU jitter
2ms Power up clock stable time
45-55% Clock duty cycle
48 pin 300 mil SSOP package
3.0V 3.7V supply range w/2.5V compatible outputs
for four CPU and single IOAPIC output
DDL1
TM
Power Groups
VDD1 = REF (0:1), X1, X2, 24MHz, 48MHz
VDD2 = PCICLKF, PCICLK(0:5)
VDD3 = SDRAM (0;11)
VDDL1 = CPUCLK (0:3)
Pin Configuration
48-Pin SSOP
* Internal Pull-up Resistor of
300K to 3.3V on indicated inputs
Pentium is a trademark of Intel Corporation
9147-14 Rev B 071897P
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.
ICS9147-14
Pin Descriptions
PIN NUMBER PIN NAME TYPE DESCRIPTION
1 VDD1 P WR Ref (0:2), XTAL, 24MHz, 48MHz power supply
2 REF0 OU T 14.318 Mhz refere nce clock.
3,9,22, 33,39,45 GND PW R Gr oun d
4X1 IN
5 X2 OUT Crystal output nominally 14.318MHz. Has internal load cap
16,23,24,
27,48
N/C - Pins are not internally connected
6,14 VDD2 P WR Supply for PCICLK_F and PCIC LK (0:5)
7
8
10, 11, 12, 13
15
PCICLK_F
FS1*
PCICLK0
FS2*
PCICLK(1:4)
PCICLK5
OUT
IN
OUT
IN
OUT
OUT
17, 18, 20, 21,
28, 29, 31, 32,
SDRAM (0:11)
OUT
34, 35,37,38
19,30,36
25
26
40, 41, 43, 44
42
46 REF1 OUT 14.318 Mhz reference clock.
VDD3
24MHz
48MHz
FS0*
CPUCLK(0:3 )
VDDL1
PWR
OUT
OUT
IN
OUT
PWR
47 IOAPIC OUT IOAPIC clock output . Powered by VDDL1.
Crystal input has internal load cap and feedback
resistor from X2
Free running PCI clock
Frequency select pin. *
PCI clock output.
Frequency select pin. *
PCI clock outputs
PCI clock output.
SDRAM clock outputs.
Supply for SDRAM (0:11)
24MHz output clock
48MHz output clock
Frequency select pin
CPU clock outputs, powered by VDD1
Supply for CPU (0:3) and IOAPIC clock, can be 2.5 or 3.3V
* Internal Pull-up Resistor of 120K to 3.3V on indicated inputs
Functionality
3.3v±10% 0-70°c
Crystal (X1, X2 = 14.3181MHz
FS2 FS1 FS0 CPU, SDRAM(MHz) PCICLK (MHz)
0 0 0 50.0 25.0 14.318
0 0 1 75.0 32.0 14.318
0 1 0 33.3 16.65 14.318
0 1 1 68.5 34.25 14.318
1 0 0 55.0 27.5 14.318
1 0 1 75.0 37.5 14.318
1 1 0 60.0 30.0 14.318
1 1 1 66.8 33.4 14.318
2
REF, IOAPIC
(MHz)
ICS9147-14
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 Characteri stics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Low Voltage V
Input Hi gh Voltage V
Output Lo w Current
Output Hi gh Current
Output Lo w Current
Output Hi gh Current
Output Lo w Current
Output Hi gh Current
Output Low Voltage
Output Hi gh Voltage
Output Low Voltage
Output Hi gh Voltage
Output Low Voltage
Output Hi gh Voltage
1
1
1
1
1
1
1
1
1
1
1
1
Supply Current I
Pullup Resistor
1
IL Latched in puts - - 0 .8 V
IH Latched inputs 2.0 - - V
IOL1
IOH1
IOL2
IOH2
IOL3
IOH3
VOL=0.8V;
for SDRAM, PCICLK
VOH=2.0V;
for SDRAM PCICLK
VOL=0.8V; 24, 48 CLKs, CPU, REF
& IOAPIC
VOH=2.0V; 24, 48 CLKs, CPU,
REF & IOAPIC
VOL=0.8V; for CPU at
VDDL = 2.5V
VOH = 1.7V; for CPU at
VDDL = 2.5V
IOL = 10mA;
VOL1
for PCICLK, SDRAM
IOH = -10mA;
VOH1
VOL2
VOH2
VOL3
VOH3
DD @66.6 MHz; all outputs unloaded - 70 120 mA
RPU1
for SDRAM, PCICLK
IOL = 8mA; for fixed CLKs, CPU,
REF & IOAPIC
IOH = -8mA; for fixed CLKs, CPU,
REF & IOAPIC
IOL = 5mA; for CPU at
VDDL = 2.5V
IOH = -5mA; for CPU at
VDDL = 2.5V
FS0, FS1 FS2 inputs 150 300 450 K ohm
19.0 30.0 - mA
- -26.0 -16.0 mA
16.0 25.0 - mA
- -22.0 -14.0 mA
10.0 18.0 - mA
- -14.0 -8.0 mA
-0.30.4V
2.4 2.8 - V
-0.30.4V
2.4 2.8 - V
- 0.25 0 .4 mA
2.1 2.25 - mA
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production.
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