ICS ICS9248-65

Integrated
Circuit
Systems, Inc.
ICS9248-65
Frequency Timing Generator for PENTIUM II™Systems
Features
Key Specification
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Generates the following system clocks:
- 3 CPU clocks ( 2.5V, 100/133MHz)
- 10 PCI clocks, including 1 free-running
(3.3V, 33.3MHz)
- 1 CPU/2 clocks (2.5V, 50/66.6MHz)
- 1 IOAPIC clocks (2.5V, 16.67MHz)
- 3 Fixed frequency 66MHz clocks(3.3V, 66.6MHz)
- 2 REF clocks(3.3V, 14.318MHz)
- 1 USB clock (3.3V, 48MHz)
Efficient power management through PD#.
0 to -0.5% typical down spread modulation on CPU, PCI,
IOAPIC, 3V66 and CPU/2 output clocks.
Uses external 14.318MHz crystal.
Block Diagram
CPU Output Jitter: <250ps
CPU/2 Output Jitter. <250ps
IOAPIC Output Jitter: <500ps
48MHz, 3V66, PCI Output Jitter: <500ps
PCI Output Jitter. <500ps
Ref Output Jitter. <1000ps
CPU 0:2 Output Skew: <175ps
PCI_F, PCI 1:7 Output Skew: <500ps
3V66_0:2 Output Skew <250ps
CPU to 3V66_0:2 Output Offset: 0.0 - 1.5ns (CPU leads)
3V66 to PCI Output Offset: 1.5 - 4ns (CPU leads)
CPU to IOAPIC Output Offset 1.5 - 4.0ns (CPU leads)
Pin Configuration
48-pin SSOP
Third party brands and names are the property of their respective owners.
9248-65 Rev C 7/28/99
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.
ICS9248-65
General Description
Power Groups:
VDDREF, GNDREF = REF, X1, X2
GNDPCI, VDDPCI = PCICLK
VDD66, GND66 = 3V66
VDD48, GND48 = 48MHz
VDDCOR, GNDCOR = PLL Core
VDDLCPU/2 , GNDLCPU/2 = CPU/2
VDDLIOAPIC, GNDIOAPIC = IOAPIC
The ICS9248-65 is a main clock synthesizer chip for Pentium
II based systems using Rambus Interface DRAMs. This chip
provides all the clocks required for such a system when used
with a Direct Rambus Clock Generator(DRCG) chip such as
the ICS9211-01.
Spread Spectrum may be enabled by driving the SPREAD#
pin active. Spread spectrum typically reduces system EMI by
8dB to 10dB. This simplifies EMI qualification without
resorting to board design iterations or costly shielding. The
ICS9248-65 employs a proprietary closed loop design, which
tightly controls the percentage of spreading over process
and temperature variations.
The CPU/2 clocks are inputs to the DRCG.
Pin Descriptions
Pin number Pin name
Type
Description
1,2
REF
3, 9, 17, 24,
VDD
28, 34
4
X1
5
X2
6,14, 20, 26,
GND
33, 45, 48
7
PCICLK_F
8,10,11,12,13,
PCICLK (1:9)
15,16,18,19
21,22,23
3V66
Output
3.3V, 14.318 MHz reference clock output.
Power
3.3 V power for clock outputs.
Input
Output
14.318 MHz crystal input
14.318 MHz crystal output
Power
Ground for clock outputs
Output
3.3 V free running PCI clock output, will not be stopped by the PCI_STOP#
Output
3.3 V PCI clock outputs, generating timing requirements for
Output
3.3 V 66 MHz clock output, fixed frequency clock typically used with AGP
Control for the frequency of clocks at the CPU output pins. If logic "0" is used the
100 MHz frequency is selected. If Logic "1" is used, the 133 MHz frequency is
selected. The PCI clock is multiplexed to run at 33.3 MHz for both selected cases.
25
SEL
133/100#
Input
27
48 MHz
Output
29,30
SEL (0:1)
Input
31
SPREAD#
Output
32
PD#
Input
35,39
GNDLCPU
CPUCLK
(0:2)
VDDLCPU
GNDLCPU/2
CPU/2
VDDLCPU/2
IOAPIC(0:1)
VDDIOAPIC
Power
3.3 V 48 MHz clock output, fixed frequency clock typically used with USB
devices
Frequency select pin , logic input.
Power-on spread spectrum enable option. Active low = spread spectrum clocking
enable. Active high = spread spectrum clocking disable.
Asynchronous active low input pin used to power down the device into a low
power state. The internal clocks are disabled and the VCO and the crystal are
stopped.
Ground for the CPU and Host clock outputs
0utput
2.5 V CPU and Host clock outputs
Power
Power
Output
Power
Output
Power
2.5 V power for the CPU and Host clock outputs
Ground for the CPU and Host clock outputs
Output running at 1/2 CPU clock frequency.Synchronous to the CPU outputs.
2.5 V power for the CPU/2 clock outputs
2.5V fixed 16.6 MHz IOAPIC clock outputs
2.5V power for IOAPIC clock
36,37,40
38,41
42
43
44
46
47
2
ICS9248-65
Frequency Select:
SEL
SEL1 SEL0
133/100#
0
0
0
0
0
1
0
1
0
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
CPU
MHz
Hi-Z
N/A
CPU/2
MHz
Hi-Z
N/A
3V66
MHz
Hi-Z
N/A
PCI
MHz
Hi-Z
N/A
48
MHz
Hi-Z
N/A
REF
MHz
Hi-Z
N/A
IOAPIC
MHz
Hi-Z
N/A
100
50
66.6
33.3
Hi-Z
14.318
16.67
10 0
50
TCLK/2 TCLK/4
N/A
N/A
133.3
66
133.3
66
66.6
33.3
48
TCLK/4 TCLK/8 TCLK/2
N/A
N/A
N/A
66
33
Hi-Z
66
33
48
14.318
16.67
TCLK TCLK/16
N/A
N/A
14.318
16.67
14.318
16.67
Comments
Tri-state
Reserved
48MHz PLL
disabled
Test mode (1)
Reserved
Note:
1. TCLK is a test clock driven on the x1 input during test mode.
ICS9248-65 Power Management Features:
PD#
CPUCLK CPU/2 IOAPIC
3V66
PCI
PCI_F
REF.
48MHz
Osc
VCOs
0
LOW
LOW
LOW
LOW
LOW
LOW
LOW
OFF
OFF
1
ON
ON
ON
ON
ON
ON
ON
ON
ON
Note:
1. LOW means outputs held static LOW as per latency requirement next page.
2. On means active.
3. PD# pulled Low, impacts all outputs including REF and 48 MHz outputs.
Power Management Requirements:
Late ncy
Singal
PD#
Singal State
No. of ris ing e dge s
of PCICLK
1 (normal operation)
3mS
0 (power down)
2max.
Note:
1. Clock on/off latency is defined in the number of rising edges of free running PCICLKs between the clock disable goes low/
high to the first valid clock comes out of the device.
2. Power up latency is when PWR_DWN# goes inactive (high to when the first valid clocks are dirven from the device.
3
ICS9248-65
PD# Timing Diagram
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.
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 VCOs and 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. PCI_STOP# and CPU_STOP#
are considered to be don't cares during the power down operations. The REF and 48MHz clocks are expected to be stopped in
the LOW state as soon as possible. Due to the state of the internal logic, stopping and holding the REF clock outputs in the
LOW state may require more than one clock cycle to complete.
Notes:
1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS9248 device).
2. As shown, the outputs Stop Low on the next falling edge after PD# goes low.
3. PD# is an asynchronous input and metastable conditions may exist. This signal is synchronized inside this part.
4. The shaded sections on the VCO and the Crystal signals indicate an active clock.
5. Diagrams shown with respect to 133MHz. Similar operation when CPU is 100MHz.
4
ICS9248-65
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.
Group Offset
Group
CPU to 3V66
3V66 to PCI
CPU to IOAPIC
Offset
0.0-1.5ns CPU leads
1.5-4.0ns 3V66 leads
1.5-4.0ns CPU leads
Measurement Loads
CPU @ 20pF, 3V66 @ 30pF
3V66 @ 30pF, PCI @ 30pF
CPU @ 20pF, IOAPIC @ 20pF
Measure Points
CPU @1.25V, 3V66 @ 1.5V
3V66 @ 1.5V, PCI @ 1.5V
CPU @1.25V, IOAPIC @ 1.5V
No te: 1 . All o ffsets are to be meas u red at ris in g edg es.
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = 0 - 70º C; Supply Voltage VDD = VDDL = 3.3 V +/-5%, (unless otherwise stated)
PARAMETER
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Input Low Current
Operating
Power Down
Supply Current
Input frequency
Input Capacitance1
Transition Time1
Settling Time
1
Clk Stabilization 1
Fi
CONDITIONS
VIN = VDD
VIN = 0 V; Inputs with no pull-up resistors
VIN = 0 V; Inputs with pull-up resistors
CL = 0 pF; Select @ 100 MHz
CL = 0 pF; Select @ 133.3 MHz
CL = 0 pF; Select @ 144 MHz
CL = 0 pF; Select @ 154 MHz
CL = 0 pF; PWRDWN# = 0
MIN
2
VSS-0.3
-5
-200
TYP
0.1
2.0
-100
65
71
75
78
64
MAX UNITS
VDD+0.3
V
0.8
V
µA
5
µA
µA
160
mA
200
µA
VDD = 3.3 V
12
14.318
16
MHz
CIN
CINX
Logic Inputs
X1 & X2 pins
27
36
5
45
pF
pF
Ttrans
To 1st crossing of target Freq.
1
3
ms
Ts
From 1st crossing to 1% target Freq.
TSTAB
From VDD = 3.3 V to 1% target Freq.
0.5
ms
3
ms
1
tCP U-P CI
VT = 1.5 V; VTL = 1.25 V
2.4
4
ns
1
tCP U-3V66
VT = 1.5 V; VTL = 1.25 V
1.4
1.5
ns
1
t3V66-P CI
VT = 1.5 V
1.4
4
ns
Skew
Skew
Skew
1
SYMBOL
VIH
VIL
IIH
IIL1
IIL2
IDD3.3OP 100
IDD3.3OP 133
IDD3.3OP 144
IDD3.3OP 154
IDD3.3P D
1.5
Guaranteed by design, not 100% tested in production.
5
ICS9248-65
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = 0 - 70º C; Supply Voltage VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5% (unless otherwise stated)
PARAMETER
Operating
Supply Current
Power Down
Supply Current
CONDITIONS
CL = 0 pF; Select @ 100 MHz
CL = 0 pF; Select @ 133.3 MHz
CL = 0 pF; Select @ 144 MHz
CL = 0 pF; Select @ 154 MHz
CL = 0 pF; PWRDWN# = 0
MIN
TYP
14
18
19
20
0.3
MAX UNITS
30
mA
30
30
30
µA
100
1.5
2.4
4
ns
1
tCPU-PCI
VT = 1.5 V; VTL = 1.25 V
1
tCPU-3V66
VT = 1.5 V; VTL = 1.25 V
1.4
1.5
ns
1
tCPU-IOAPIC
VTL = 1.25 V
1.4
4
ns
Skew
Skew
Skew
1
SYMBOL
IDD2.5OP100
IDD2.5OP133
IDD2.5OP144
IDD2.5OP154
IDD2.5PD
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - CPUCLK
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
SYMBOL
VOH2B
VOL2B
IOH2B
IOL2B
CONDITIONS
IOH = -12.0 mA
IOL = 12 mA
VOH = 1.7 V
VOL = 0.7 V
MIN
2
19
TYP
2.3
0.31
-39
27
MAX UNITS
V
0.4
V
-19
mA
mA
tr2B
1
VOL = 0.4 V, VOH = 2.0 V
0.95
1.6
ns
Fall Time
tf2B
1
VOH = 2.0 V, VOL = 0.4 V
1
1.6
ns
Duty Cycle
Jitter, Absolute
d t2B1
tsk2B1
tj1 σ2B1
tjabs2B1
Jitter, Cycle-to-cycle
tjcyc-cyc2B1
Skew
Jitter, One Sigma
1
VT = 1.25 V, Freq. < 124 MHz
50
55
%
VT = 1.25 V
22
175
ps
VT = 1.25 V
21
150
ps
55
+250
ps
110
250
ps
VT = 1.25 V
VT = 1.25 V
45
-250
Guaranteed by design, not 100% tested in production.
6
ICS9248-65
Electrical Characteristics - CPU/2
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
SYMBOL
VOH2B
VOL2B
IOH2B
IOL2B
CONDITIONS
IOH = -12.0 mA
IOL = 12 mA
VOH = 1.7 V
VOL = 0.7 V
MIN
2
19
TYP
2.3
0.31
-33
27
MAX UNITS
V
0.4
V
-19
mA
mA
Rise Time
tr2B
1
VOL = 0.4 V, VOH = 2.0 V
1.1
1.6
ns
Fall Time
tf2B1
VOH = 2.0 V, VOL = 0.4 V
1
1.6
ns
Duty Cycle
48
55
%
13
150
ps
Jitter, Absolute
d t2B1
tj1 σ2B1
tjabs2B1
42
+250
ps
Jitter, Cycle-to-cycle
tjcyc-cyc2B1
100
250
ps
Jitter, One Sigma
1
VT = 1.25 V, Freq. < 124 MHz
45
VT = 1.25 V
VT = 1.25 V
VT = 1.25 V
-250
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - 3V66
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 30 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
1
1
Duty Cycle
1
1
Skew
Jitter, One Sigma
1
1
Jitter, Absolute
Jitter, Cycle-to-cycle1
1
SYMBOL
VOH1
VOL1
IOH1
IOL1
CONDITIONS
IOH = -11 mA
IOL = 9.4 mA
VOH = 2.0 V
VOL = 0.8 V
MIN
2.4
25
TYP
3.1
0.17
-61
45
MAX UNITS
V
0.4
V
-22
mA
mA
tr1
VOL = 0.4 V, VOH = 2.4 V
0.5
1.8
2
ns
tf1
VOH = 2.4 V, VOL = 0.4 V
0.5
1.7
2
ns
d t1
VT = 1.5 V
45
51
55
%
tsk1
VT = 1.5 V
37
500
ps
tj1 σ1
VT = 1.5 V
16
150
ps
tjabs1
VT = 1.5 V
VT = 1.5 V
50
250
ps
130
500
ps
tjcyc-cyc1
-250
Guaranteed by design, not 100% tested in production.
7
ICS9248-65
Electrical Characteristics - PCICLK
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 30 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
1
1
Duty Cycle
1
1
Skew
Jitter, One Sigma
1
1
Jitter, Absolute
Jitter, Cycle-to-cycle1
1
SYMBOL
VOH1
VOL1
IOH1
IOL1
CONDITIONS
IOH = -11 mA
IOL = 9.4 mA
VOH = 2.0 V
VOL = 0.8 V
MIN
2.4
25
TYP
3.1
0.17
-62
45
MAX UNITS
V
0.4
V
-22
mA
mA
tr1
VOL = 0.4 V, VOH = 2.4 V
1.5
2
ns
tf1
VOH = 2.4 V, VOL = 0.4 V
1.6
2
ns
d t1
VT = 1.5 V
50
55
%
tsk1
VT = 1.5 V
310
500
ps
tj1 σ1
VT = 1.5 V
11
150
ps
tjabs1
VT = 1.5 V
VT = 1.5 V
45
250
ps
105
500
ps
TYP
2.4
0.17
-61
53
MAX UNITS
V
0.4
V
-19
mA
mA
tjcyc-cyc1
45
-250
Guaranteed by design, not 100% tested in production.
Electrical Characteristics - IOAPIC
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
1
1
Duty Cycle
1
Jitter, One Sigma
1
1
Jitter, Absolute
Jitter, Cycle-to-cycle1
1
SYMBOL
VOH4B
VOL4B
IOH4B
IOL4B
CONDITIONS
IOH = -12 mA
IOL = 12 mA
VOH = 1.7 V
VOL = 0.7 V
MIN
2
19
Tr4B
VOL = 0.4 V, VOH = 2.0 V
0.75
2.2
ns
Tf4B
VOH = 2.0 V, VOL = 0.4 V
0.675
2
ns
Dt4B
VT = 1.25 V
49.5
55
%
Tj1 σ4B
VT = 1.25 V
26
150
ps
Tjabs4B
VT = 1.25 V
VT = 1.25 V
137
500
ps
200
500
ps
tjcyc-cyc4B
45
-500
Guaranteed by design, not 100% tested in production.
8
ICS9248-65
Electrical Characteristics - REF, 48MHz
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time
Fall Time
1
1
Duty Cycle
1
Jitter, One Sigma
Jitter, Absolute
1
Jitter, One Sigma
Jitter, Absolute
1
1
1
1
SYMBOL
VOH5
VOL5
IOH5
IOL5
CONDITIONS
IOH = -12 mA
IOL = 10 mA
VOH = 2.0 V
VOL = 0.8 V
MIN
2.4
16
TYP
2.9
0.33
-31
23
MAX UNITS
V
0.4
V
-22
mA
mA
tr5
VOL = 0.4 V, VOH = 2.4 V
1.8
4
ns
tf5
VOH = 2.4 V, VOL = 0.4 V
2.1
4
ns
d t5
VT = 1.5 V
52
55
%
85
150
ps
285
500
ps
32
150
ps
110
250
ps
tj1 σ5
VT = 1.5 V, REF
tjabs5
VT = 1.5 V, REF
tj1 σ5
VT = 1.5 V, 48 MHz
tjabs5
VT = 1.5 V, 48 MHz
45
-500
-250
Guaranteed by design, not 100% tested in production.
9
ICS9248-65
SYMBOL
A
A1
A2
B
C
D
E
e
H
h
L
N
µ
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
48 Pin SSOP Package
Ordering Information
ICS9248yF-65
Example:
ICS XXXX y F - PPP
Pattern Number (2 or 3 digit number for parts with ROM code patterns)
Package Type
F=SSOP
Revision Designator (will not correlate with datasheet revision)
Device Type (consists of 3 or 4 digit numbers)
Prefix
ICS, AV = Standard Device
10
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.