Integrated
Circuit
Systems, Inc.
ICS9112-27
Preliminary Product Preview
Low Skew PCI / PCI-X Buffer
General Description
The
ICS9112-27
is a high performance, low skew, low jitter
PCI / PCI-X clock driver. It is designed to distribute high
speed signals in PCI / PCI-X applications operating at speeds
from 0 to 140 MHz.
The
ICS9112-27
is characterized for operation from -40°C to
85°C for automotive and industrial applications.
Features
•
•
•
•
•
•
Frequency range 0 - 140 MHz (3.3V)
Less than 200 ps Jitter between outputs
Skew controlled outputs < 100 ps
Distribute one clock input to one bank of four
outputs
3.3V ±10% operation
Available in 8 pin TSSOP, and SOIC packages.
Block Diagram
OE
LOGIC
CONTROL
Pin Configuration
CLK_IN
1
2
3
4
ICS9112-27
8
7
6
5
CLK3
CLK2
VDD
CLK1
CLK0
OE
CLK0
CLK1
CLK_IN
CLK2
GND
8 pin TSSOP & SOIC
Functionality Table
CLK3
INPUTS
CLK_IN
0
0
1
OE
0
1
0
1
OUTPUTS
CLK(3:0)
0
0
0
1
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
CLK_IN
OE
CLK0
GND
CLK1
VDD
CLK2
CLK3
TYPE
IN
IN
OUT
PWR
OUT
PWR
OUT
OUT
Input reference frequency.
1
DESCRIPTION
Output enable (has internal pull_up.) when OE is low, it tristates the clock
outputs
Buffered clock output
Ground
Buffered clock output
Power supply for 3.3V
Buffered clock output
Buffered clock output
9112-27 Rev B 02/27/01
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.
ICS9112-27
Preliminary Product Preview
Absolute Maximum Ratings
Supply voltage range V
DD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-0.5V to 4.3 V
Input voltage rangeV
I
(see notes 1 & 2) . . . . . . . . . . . . -0.5V to V
DD
+ 0.5V
Output voltage range V
O
(see notes 1 & 2) . . . . . . . . . -0.5V to V
DD
+ 0.5V
Input clamp current I
IK
(V
I
< 0 or V
I
>V
DD
) . . . . . . . . . . . . . . . . . . . ±50 mA
Output clamp current I
OK
(V
O
< 0 or V
O
) . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous total output current, I
O
(V
O
= 0 to V
DD
) . . . . . . . . . . . ±50 mA
Package thermal impedance Ø
JA
(see note 3): PW package . . . 230.5°C/W
Storage temperature rante, T
stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-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.
Notes:
1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are
observed.
2. This value is limited to 4.6 V maximum.
3. The package thermal impedance is calculated in accordance with JESD 51.
Terminal Functions
Terminal
CLK (3-0)
CLKIN
GND
OE
V
DD
3.3V
No
8, 7, 5, 3
1
4
2
6
I/O
O
I
PWR
I
PWR
Buffered output clocks
Input reference frequency
Ground
Outputs enable control
3.3V supply
Description
Recommended Operating Conditions
Min
Supply voltage, V
DD
High-level input voltage, V
IH
Low-level input voltage, V
IL
Input voltage, V
I
High-level output current, I
OH
Low-level output current, I
OL
Operating free-air temperature, T
A
-40
0
3
0.7
X
V
DD
0.3
X
V
DD
V
DD
-24
24
85
Nom
3.3
Max
3.6
Unit
V
V
V
V
mA
mA
°C
Timing requirements over recommended ranges of supply voltage and operating free-air temperature
Min
Clock frequency f
CLK
0
Nom
Max
140
Unit
MHz
2
ICS9112-27
Preliminary Product Preview
Electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
Parameter
Input voltage V
IK
Test Conditions
V
DD
= 3.3V, I
I
= 18 mA
V
DD
= min to max, I
OH
= -1 mA
High-level output voltage V
OH
V
DD
= 3 V I
OH
= 24 mA
V
DD
= 3 V I
OH
= 12 mA
V
DD
= min to max, I
OL
= -1 mA
Low-level output voltage V
OL
V
DD
= 3 V I
OL
= 24 mA
V
DD
= 3 V I
OL
= 12 mA
High-level output current I
OH
V
DD
= 3 V V
O
= 1 V
V
DD
= 3.3 V V
O
= 1.65 V
V
DD
= 3 V V
O
= 2 V
V
DD
= 3.3 V V
O
= 1.65 V
V
I
= V
O
or V
DD
f = 67 MHz
V
DD
= 3.3V V
I
= 0 V or V
DD
V
DD
= 3.3V V
I
= 0 V or V
DD
3
3.2
60
70
±5
37
-50
-55
V
DD
-0.2
2
2.4
0.2
0.8
0.55
Min
Nom
Max
-1.2
Unit
V
V
V
V
V
V
V
mA
mA
mA
mA
µA
mA
pF
pF
Low-level output current I
OL
Input current I
I
Dynamic Current, see figure 5 I
DD
Input capacitance C
i
Output capacitance C
o
Switching characteristics over recommended ranges of supply voltage and operating free-air temperature,
CL = 25 pF, VDD = 3.3 V (see note 6 and figures 1 and 2)
Parameter
Test Conditions
Min
Nom
Max
Unit
High-to-low propagation delay t
PLH
Low-to-high propagation delay t
PHL
Output skew (see note 4) T
SK (O
)
Pulse skew t
SK (P)
Process skew T
SK (PR)
CLK high time, see figure 4 T
high
See figures 1 and 2
1.8
1.8
2.5
2.4
3
3
100
ns
ns
ps
ps
ns
V
IH
= V
DD
, V
IL
= 0 V
150
66 MHz
140 MHz
66 MHz
140 MHz
0.2V
DD
to 0.6V
DD
0.6V
DD
to 0.2V
DD
6
3
6
3
1.5
1.5
2.7
2.7
4
4
ns
CLK low time, see figure 4 T
low
Output rise slew rate‡ T
r
Output fall slew rate‡ T
f
ns
V/ns
V/ns
3
ICS9112-27
Preliminary Product Preview
Parameter Measurement Information
V
DD
140W
CLK
n
10 pF
140W
Figure 1. Test Load Circuit
V
DD
50% V
DD
CLKIN
t
PLH
T
PHL
V
OH
0V
0.6 V
DD
50% V
DD
CLK0-CLK3
0.2 V
DD
t
R
0.6 V
DD
50% V
DD
0.2 V
DD
t
f
V
OL
Figure 2. Voltage Thresholds for Propagation Delay (t
pd
) Measurements
50% V
DD
Any CLK
50% V
DD
Any CLK
T
sk(0)
Figure 3. Output Skew
Paramameter
V
IH(Min)
V
IL(Max)
V
test
Value
0.5 V
DD
0.35 V
DD
0.4 V
DD
Unit
V
V
V
V
IH(Min)
V
test
V
IL(Max)
t
high
0.6 V
DD
t
cyc
t
low
0.2 V
DD
Figure 4. Clock Waveform
0.4 V
DD
Peak to Peak (Minimum)
Note: All parameters in Figure 4 are according to PCI-X 1.0 specifications.
4
ICS9112-27
Preliminary Product Preview
Parameter Measurement Information
Supply Current
vs
Frequency
60
VDD = 3.6 V
TA = 85°C
50
I
CC
- Supply Current - mA
40
20
0
20
40
60
80
100
120
140
160
F - Frequency - Mhz
Figure 5
High Level Output Voltage
vs
High-Level Output Current
3.5
V
OH
- High-Level Output Voltage - V
3.0
2.5
2.0
1.5
1.0
0.5
0
-100
VDD = 3.3 V
TA = 25°C
-90
-80
-70
-60
-50
-40
-30
I
OH
-High-Level Output Current-mA
Figure 6
-20
-10
0
5
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