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19-2511; Rev 3; 11/04
2:8 Differential LVPECL/LVECL/HSTL Clock and
Data Driver
General Description
The MAX9325 low-skew, 2:8 differential driver features
extremely low output-to-output skew (50ps max) and
part-to-part skew (225ps max). These features make
the device ideal for clock and data distribution across a
backplane or board. The device selects one of the two
differential HSTL or LVECL/LVPECL inputs and repeats
them at eight differential outputs. Outputs are compati-
ble with LVECL and LVPECL, and can directly drive
50Ω terminated transmission lines.
The differential inputs can be configured to accept a
single-ended signal when the unused complementary
input is connected to the on-chip reference output volt-
age V
BB.
All inputs have internal pulldown resistors to
V
EE.
The internal pulldowns and a fail-safe circuit
ensure differential low default outputs when the inputs
are left open or at V
EE
.
The MAX9325 operates over a 2.375V to 3.8V supply
range for interfacing to differential HSTL and LVPECL
signals. This allows high-performance clock or data dis-
tribution in systems with a nominal +2.5V or +3.3V sup-
ply. For LVECL operation, the device operates with a
-2.375V to -3.8V supply.
The MAX9325 is offered in 28-lead PLCC and space-
saving 28-lead QFN packages. The MAX9325 is speci-
fied for operation from -40°C to +85°C.
♦
50ps (max) Output-to-Output Skew
♦
1.5ps
RMS
(max) Random Jitter
♦
Guaranteed 300mV Differential Output at 700MHz
♦
+2.375V to +3.8V Supplies for Differential
HSTL/LVPECL
♦
-2.375V to -3.8V Supplies for Differential LVECL
♦
Two Selectable Differential Inputs
♦
On-Chip Reference for Single-Ended Inputs
♦
Outputs Low for Inputs Open or at V
EE
♦
Pin Compatible with MC100LVE310
Features
MAX9325
Ordering Information
PART
MAX9325EQI
MAX9325EGI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 PLCC
28 QFN 5mm x 5mm
Applications
Precision Clock Distribution
Low-Jitter Data Repeaters
Functional Diagram appears at end of data sheet.
Pin Configurations
V
CC
Q0
Q0
Q1
Q1
Q2
Q2
V
CC
TOP VIEW
Q0
Q0
Q1
Q1
Q2
Q2
INPUT SELECT TRUTH TABLE
CLK_SEL
INPUT CLOCK
CLK0, CLK0 SELECTED
CLK1, CLK1 SELECTED
28
27
26
25
24
23
22
25 24
23 22 21
20
19
*
*
L
V
EE
CLK_SEL
CLKO
V
CC
CLKO
V
BB
CLK1
26
27
28
1
2
3
4
18
17
16
Q3
Q3
Q4
V
CC
Q4
Q5
Q5
V
EE
CLK_SEL
CLKO
V
CC
CLKO
V
BB
CLK1
1
2
3
4
5
6
7
*
21
20
19
Q3
Q3
Q4
V
CC
Q4
Q5
Q5
H
MAX9325
15
14
13
12
MAX9325
18
17
16
15
*
5
6
7
Q7
8
9
10
Q6
11
Q6
CLK1
N.C.
V
CC
Q7
10
11
12
13
Q6
CLK1
V
CC
Q7
N.C.
QFN
*CORNER PINS AND EXPOSED PAD ARE CONNECTED TO V
EE
.
________________________________________________________________
Maxim Integrated Products
Q7
Q6
PLCC
14
8
9
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2:8 Differential LVPECL/LVECL/HSTL Clock and
Data Driver
MAX9325
ABSOLUTE MAXIMUM RATINGS
V
CC
- V
EE
...............................................................-0.3V to +4.1V
Inputs (CLK_,
CLK_,
CLK_SEL) to V
EE
......-0.3V to (V
CC
+ 0.3V)
CLK_ to
CLK_
.....................................................................±3.0V
Continuous Output Current .................................................50mA
Surge Output Current........................................................100mA
V
BB
Sink/Source Current................................................±0.65mA
Continuous Power Dissipation (T
A
= +70°C)
28-Lead PLCC (derate 10.5mW/°C above +70°C) .....842mW
θ
JA
in Still Air .............................................................+95°C/W
θ
JC
.............................................................................+25°C/W
28-Lead QFN (derate 20.8mW/°C above +70°C) ....1667mW
θ
JA
in Still Air ............................................................+48°C/W
θ
JC
..............................................................................+2°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
ESD Protection
Human Body Model (CLK_,
CLK_,
Q_,
Q_)....................≥2kV
Soldering Temperature (10s) ...........................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
((V
CC
- V
EE
) = 2.375V to 3.8V, R
L
= 50Ω
±1%
to V
CC
- 2V. Typical values are at (V
CC
- V
EE
) = 3.3V, V
IH
= (V
CC
- 1V), V
IL
= (V
CC
- 1.5V).)
(Notes 1–4)
PARAMETER
SYMBOL
CONDITIONS
-40°C
MIN
TYP
MAX
MIN
+25°C
TYP
MAX
MIN
+85°C
TYP
MAX
UNITS
SINGLE-ENDED INPUT (CLK_SEL)
Single-Ended
Input High
Voltage
Single-Ended
Input Low
Voltage
Input Current
V
IH
Figure 1
V
CC
- 1.165
V
CC
V
CC
- 1.165
V
CC
V
CC
- 1.165
V
CC
V
V
IL
I
IN
Figure 1
V
IH
, V
IL
V
EE
-10.0
V
CC
- 1.475
+150
V
EE
-10.0
V
CC
- 1.475
+150
V
EE
-10.0
V
CC
- 1.475
+150
V
µA
DIFFERENTIAL INPUT (CLK_,
CLK_)
Single-Ended
Input High
Voltage
Single-Ended
Input Low
Voltage
Differential Input
High Voltage
V
IH
Figure 1
V
CC
- 1.165
V
CC
V
CC
- 1.165
V
CC
V
CC
- 1.165
V
CC
V
V
IL
Figure 1
V
EE
V
EE
+ 1.2
V
CC
- 1.475
V
CC
V
EE
V
EE
+ 1.2
V
CC
- 1.475
V
CC
V
EE
V
EE
+ 1.2
V
CC
- 1.475
V
CC
V
V
IHD
Figure 1
V
2
_______________________________________________________________________________________
2:8 Differential LVPECL/LVECL/HSTL Clock and
Data Driver
DC ELECTRICAL CHARACTERISTICS (continued)
((V
CC
- V
EE
) = 2.375V to 3.8V, R
L
= 50Ω
±1%
to V
CC
- 2V. Typical values are at (V
CC
- V
EE
) = 3.3V, V
IH
= (V
CC
- 1V), V
IL
= (V
CC
- 1.5V).)
(Notes 1–4)
PARAMETER
Differential Input
Low Voltage
SYMBOL
V
ILD
CONDITIONS
Figure 1
(V
CC
- V
EE
)
<
3.0V, Figure 1
(V
CC
- V
EE
)
≥
3.0V, Figure 1
V
IH,
V
IL,
V
IHD,
V
ILD
-40°C
MIN
V
EE
0.095
0.095
-10.0
TYP
MAX
V
CC
- 0.095
V
CC
- V
EE
3.0
+150.0
MIN
V
EE
0.095
0.095
-10.0
+25°C
TYP
MAX
V
CC
- 0.095
V
CC
- V
EE
3.0
+150.0
MIN
V
EE
0.095
0.095
-10.0
+85°C
TYP
MAX
V
CC
- 0.095
V
CC
- V
EE
V
3.0
+150.0
µA
UNITS
V
MAX9325
Differential Input
Voltage
V
IHD -
V
ILD
Input Current
OUTPUT (Q_,
Q_)
Single-Ended
Output High
Voltage
Single-Ended
Output Low
Voltage
Differential
Output Voltage
I
IN
V
OH
Figure 2
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
- 1.085 - 0.977 - 0.880 - 1.025 - 0.949 - 0.88 - 1.025 - 0.929 - 0.88
V
V
OL
Figure 2
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
- 1.810 - 1.695 - 1.620 - 1.810 - 1.697 - 1.62 - 1.810 - 1.698 - 1.62
535
718
595
749
595
769
V
V
OH
- V
OL
Figure 2
mV
REFERENCE VOLTAGE OUTPUT (V
BB
)
Reference
Voltage Output
SUPPLY
Supply Current
I
EE
(Note 6)
35
50
39
55
42
65
mA
V
BB
I
BB
=
±0.5mA
(Note 5)
V
CC
V
CC
- 1.38 - 1.318
V
CC
-
1.26
V
CC
V
CC
V
CC
- 1.38 - 1.325 - 1.26
V
CC
V
CC
V
CC
- 1.38 - 1.328 - 1.26
V
_______________________________________________________________________________________
3
2:8 Differential LVPECL/LVECL/HSTL Clock and
Data Driver
MAX9325
AC ELECTRICAL CHARACTERISTICS—PLCC Package
((V
CC
- V
EE
) = 2.375V to 3.8V, R
L
= 50Ω
±1%
to V
CC
- 2V, f
IN
≤
500MHz, input transition time = 125ps (20% to 80%). Typical values
are at (V
CC
- V
EE
) = 3.3V, V
IH
= (V
CC
- 1V), V
IL
= (V
CC
- 1.5V).) (Note 7)
PARAMETER
Differential
Input-to-Output
Delay
Single-Ended
Input-to-Output
Delay
Output-to-
Output Skew
Part-to-Part
Skew
Added Random
Jitter
Added
Deterministic
Jitter
Switching
Frequency
Output Rise/Fall
Time (20% to
80%)
SYMBOL
t
PLHD
t
PHLD
t
PLH
t
PHL
t
SKOO
t
SKPP
CONDITIONS
-40°C
MIN
525
TYP
MAX
725
MIN
550
+25°C
TYP
MAX
750
MIN
575
+85°C
TYP
MAX
775
UNITS
Figure 2
ps
Figure 3 (Note 8)
500
750
550
800
600
850
ps
(Note 9)
Differential input
(Note 10)
f
IN
= 0.5GHz
clock pattern
(Note 11)
f
IN
= 1.0Gbps,
2E
23
- 1 PRBS
pattern (Note 11)
V
OH
- V
OL
≥
300mV clock
pattern
50
160
50
190
50
225
ps
ps
t
RJ
1.5
1.5
1.5
ps
RMS
t
DJ
100
100
100
ps
P-P
f
MAX
1.5
1.5
1.5
GHz
t
R
, t
F
Figure 2
140
440
140
440
140
440
ps
4
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