19-2511; Rev 1; 7/02
2:8 Differential LVPECL/LVECL/HSTL Clock and
Data Driver
General Description
Features
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.
ꢀ 50ps (max) Output-to-Output Skew
ꢀ 1.5ps (max) Random Jitter
RMS
ꢀ 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
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-
ꢀ On-Chip Reference for Single-Ended Inputs
ꢀ Outputs Low for Inputs Open or at V
ꢀ Pin Compatible with MC100LVE310
EE
age V
EE.
All inputs have internal pulldown resistors to
BB.
V
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.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 PLCC
MAX9325EQI
MAX9325ETI*
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.
28 QFN 5mm x 5mm
*Future product—contact factory for availability.
Applications
Precision Clock Distribution
Functional Diagram appears at end of data sheet.
Low-Jitter Data Repeaters
Pin Configurations
TOP VIEW
INPUT SELECT TRUTH TABLE
25 24 23 22 21 20 19
CLK_SEL
INPUT CLOCK
*
*
L
CLK0, CLK0 SELECTED
CLK1, CLK1 SELECTED
V
EE
Q3
Q3
Q4
V
26
27
28
1
18
17
16
15
14
13
12
H
V
1
2
3
4
5
6
7
21 Q3
20 Q3
19 Q4
EE
CLK_SEL
CLKO
CLK_SEL
CLKO
V
CC
CC
MAX9325
V
CC
18
V
CC
CLKO
2
Q4
Q5
Q5
MAX9325
V
BB
3
CLKO
17 Q4
16 Q5
15 Q5
4
CLK1
V
BB
CLK1
5
6
7
8
9
10 11
*
*
PLCC
QFN
*CORNER PINS AND EXPOSED PAD ARE CONNECTED TO V
.
EE
________________________________________________________________ Maxim Integrated Products
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.