C9716J
100 MHz Clock Generator with SSCG and Power Management for Mobile Application
Preliminary
Product Features
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•
•
•
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Supplies:
2 Ref clocks
2 Host (CPU) clocks
1 free running and 5 PCI Clocks
1 48MHz fixed clock
1 48 or 24 MHz fixed clock
Separate supply pins for mixed (3.3/2.5V) voltage
application.
100 or 66 MHz CPU clock operation
-1.5% Spread Spectrum modulation for reducing
EMI
Rich Power Management Functions.
28-pin SSOP & TSSOP packages for minimum
board space.
Frequency Table
SEL 100/66#
0
1
CPU Clock
66.66 MHz
100.00 MHz
PCI Clock
33.33 MHz
33.33 MHz
Block Diagram
SEL48#
Pin Configuration
REF2
VDDR
XIN
XOUT
OSC
SS#
REF1
SEL48#
PLL
48-24M
48-24M/TS#
VDDC
SEL100/66#
CS#
PD#
PS#
SS#
PLL
CPU (1,2)
PCI_F
VDDP
VSS
XIN
XOUT
PCI_F
PCI1
PCI2
VSS
VDDP
PCI3
PCI4
PCI5
VDDF
48M
48-24/TS#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VDDR
REF/SEL48#
REF1/SS#
VDDC
CPU1
CPU2
VSS
VSS
PS#
VDD
CS#
PD#
SEL100/66#
VSS
PCI (1:3)
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571
Rev. 1.0
4/28/2000
Page 1 of 12
C9716J
100 MHz Clock Generator with SSCG and Power Management for Mobile Application
Preliminary
Pin Description
PIN No.
2
Pin Name
XIN
PWR
VDD
I/O
I
TYPE
XTAL4
Description
On-chip reference oscillator input pin. Requires either an
external parallel resonant crystal (nominally 14.318 MHz) or
externally generated reference signal
O-chip reference oscillator output pin. Drives an external
parallel resonant crystal (14.318 MHz) when an externally
generated reference signal is used.
3.3 volt power supply for core logic.
Clock outputs. CPU frequency table specified on page 1.
Powers down device when LOW
When signal is LOW, stops CPU clocks in low state.
Frequency select input pins. See frequency select table on
page 1. NO INTERNAL PULLUP RESISTOR IS PROVIDED
BY DEVICE
2.5V power for CPU and Host clock outputs.
Free running PCI clock 3.3V. Does not stop when PS# is at a
logic LOW level
PCI output clocks. See frequency table of page 1.
When signal is LOW, stops all PCI clocks in low state.
3.3 Volt power supply pins for free running PCI clock output
buffer.
Fixed 48 MHz clock.
Power up selectable 48 or 24 MHz clock. If strapped LOW at
powerup causes the devices outputs to be tri-stated until the
next power up sequence occurs.
At power up this pin determines if the device’s spread
spectrum modulation feature is enabled or disabled. After
power up this pin becomes a reference clock output. A 0 (logic
low) enables SSCG and a 1 (logic high) disables SSCG.
At power up this pin determine the frequency of the clock at pin
14. If it is LOW, the clock will be 48 MHz, if HIGH the clock will
be 24 MHz. After power up this pin will become a reference
clock output.
Power for fixed clock output buffer.
Ground pins for device.
Power for Reference Oscillator output buffer.
3
XOUT
VDD
O
XTAL4
19
23, 24
17
18
16
VDD
CPU (1,2)
PD#
CS#
SEL100/66#
-
VDDC
-
-
-
P
O
I
I
I
PWR
C100S
INP3U
INP3U
INP3
25
4
5,6,9,
10,11
20
8
13
14
VDDC
PCI_F
PCI(1:5)
PS#
VDDP
48M
48-24M/TS#
-
VDDP
VDDP
-
-
VDDF
VDDF
P
O
O
I
P
O
I/O
PWR
P100S
P100S
INP3U
PWR
U48
U48BU
26
REF1/SS#
VDDR
I/O
U48BU
27
REF2/SEL48
#
VDDR
I/O
U48BU
12
1, 7, 15,
21, 22
28
VDDF
VSS
VDDR
-
-
-
P
P
P
PWR
PWR
PWR
Notes
1. INP3U pins have internal pullup resistors that will guarantee to a logic1 (high) level if no connection is made to the
device’s pin. INP3 pins do not contain this function and must be electrically connected to VDD or VSS by external
circuitry to ensure a valid logic 1 or 0 is sensed.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571
Rev. 1.0
4/28/2000
Page 2 of 12
C9716J
100 MHz Clock Generator with SSCG and Power Management for Mobile Application
Preliminary
Frequency Selection Table
Descriptions
All Outputs Tri-State
66 MHz
100 MHz
Test Mode
48-24M/TS#
at Power UP
0
1
1
0
SEL
66/100
0
0
1
1
Outputs
CPU
PCI
Hi-Z
66.66 MHz
100.00 MHz
7.16 MHz
Hi-Z
33.33 MHz
33.33 MHz
2.38 MHz
48M
Hi-Z
48 MHz
48 MHz
7.16 MHz
48/24M
Hi-Z
24/48 MHz
24/48 MHz
7.16/3.58 MHz
Power Management Functions
PS#
X
1
0
CS#
X
0
1
PD#
0
1
X
CPU
LOW
LOW
ON
48M
LOW
ON
ON
PCI
LOW
ON
LOW
PCI_F
LOW
ON
ON
VCOs
OFF
ON
ON
CS# is an input clock synthesizer. It is used to turn off the CPU clocks for low power operation. CS# is asserted
asynchronously by the external clock control logic with the rising edge of free running PCI clock (and hence CPU Clock)
and must be internally synchronized to the external PCI_F output. All other clocks will continue to run while the CPU
clocks are disabled. The CPU clocks must always be stopped in a low state and started in such a manner as to
guarantee that the high pulse width is a full pulse. CPU clock on latency need to be
2 or 3 CPU clocks
periods in time
and CPU clock off latency needs to be
2 or 3 CPU clocks
periods in time.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571
Rev. 1.0
4/28/2000
Page 3 of 12
C9716J
100 MHz Clock Generator with SSCG and Power Management for Mobile Application
Preliminary
Power Management Timing
CPU
CS#
CPU STOP TIMING
CPU
PCI
REF
48M
PD#
POWER DOWN TIMING
PCI
PS#
PCI STOP TIMING
The power down selection is used to put the part into a very low power state without turning off the power to the part.
PD# is an asynchronous active low input. This signal needs to be synchronized internal to the device prior to powering
down the clock synthesizer. PD# is an asynchronous function for powering up the system. Internal clocks are not running
after the device is put in power down. When PD# is active low, all clocks need to be driven to a low value and held prior
to turning off the VCO’s and the Crystal. The power-up latency needs to be less than 3 mS. The power down latency
should be as short as possible but conforming to the sequence requirements shown below. AS# and CS# are
considered to be don’t cares during the power down operations.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571
Rev. 1.0
4/28/2000
Page 4 of 12
C9716J
100 MHz Clock Generator with SSCG and Power Management for Mobile Application
Preliminary
Power Management Timing
Signal
CS#
PD#
Signal State
0 (disabled)
1 (enabled)
1 (cold start/normal operation)
0 (power down)
Latency
No. of rising edges of free
running PCI CLOCK (PCIF)
1
1
3 mS
1
NOTES:
1. Clock on/off latency is defined in the number of rising edges of free running PCI CLOCK between the clock disable
goes low/high to the first valid clock comes out of the device.
Spectrum Spread Clocking
Non -Spread
Reduction
Spread
Spectrum Analysis
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 ext. 275 FAX 408-263-6571
Rev. 1.0
4/28/2000
Page 5 of 12
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