19-2223; Rev 2; 1/05
Quad Differential LVECL/LVPECL
Buffer/Receivers
General Description
The MAX9400/MAX9402/MAX9403/MAX9405 are
extremely fast, low-skew quad LVECL/ECL or LVPECL/
PECL buffer/receivers designed for high-speed data
and clock driver applications. These devices feature an
ultra-low propagation delay of 335ps and channel-to-
channel skew of 16ps in asynchronous mode with
86mA supply current.
The four channels can be operated synchronously with
an external clock, or in asynchronous mode determined
by the state of the SEL input. An enable input provides
the ability to force all the outputs to a differential low
state.
A variety of input and output terminations are offered for
maximum design flexibility. The MAX9400 has open
inputs and open emitter outputs. The MAX9402 has
open inputs and 50Ω series outputs. The MAX9403 has
100Ω differential input impedance and open emitter
outputs. The MAX9405 has 100Ω differential input
impedance and 50Ω series outputs.
These devices operate with a supply voltage of (V
CC
-
V
EE
) = 2.375V to 5.5V, and are specified for operation
from -40°C to +85°C. These devices are offered in
space-saving 32-pin 5mm
✕
5mm TQFP and 32-lead
5mm
✕
5mm QFN packages.
Features
♦
400mV Differential Output at 3.0GHz Data Rate
♦
335ps Propagation Delay in Asynchronous Mode
♦
8ps Channel-to-Channel Skew in Synchronous
Mode
♦
Integrated 50Ω Outputs (MAX9402/MAX9405)
♦
Integrated 100Ω Inputs (MAX9403/MAX9405)
♦
Synchronous/Asynchronous Operation
MAX9400/MAX9402/MAX9403/MAX9405
Ordering Information
PART
TEMP
RANGE
PIN-
DATA
OUTPUT
PACKAGE INPUT
Open
Open
Open
Open
100Ω
100Ω
100Ω
100Ω
Open
Open
50Ω
50Ω
Open
Open
50Ω
50Ω
MAX9400EHJ
-40°C to +85°C 32 TQFP
MAX9400EGJ* -40°C to +85°C 32 QFN
MAX9402EHJ
-40°C to +85°C 32 TQFP
MAX9402EGJ* -40°C to +85°C 32 QFN
MAX9403EHJ
-40°C to +85°C 32 TQFP
MAX9403EGJ* -40°C to +85°C 32 QFN
MAX9405EHJ
-40°C to +85°C 32 TQFP
MAX9405EGJ* -40°C to +85°C 32 QFN
Applications
Data and Clock Driver and Buffer
Central Office Backplane Clock Distribution
DSLAM Backplane
Base Station
ATE
*Future
product—contact factory for availability.
Pin Configurations
OUT0
V
CC
V
EE
IN0
IN0
IN1
26
IN1
25
24 V
CC
23 OUT1
22 OUT1
21 V
EE
20 V
EE
19 OUT2
18 OUT2
17 V
CC
9
IN3
10
IN3
11
V
CC
12
OUT3
13
OUT3
14
V
EE
15
IN2
16
IN2
TOP VIEW
32
V
CC
SEL
SEL
CLK
CLK
1
2
3
4
5
6
7
8
31
30
29
28
OUT0
27
Functional Diagram appears at end of data sheet.
EN
EN
V
CC
MAX9400
MAX9402
MAX9403
MAX9405
TQFP (5mm x 5mm)
Pin Configurations continued at end of data sheet.
________________________________________________________________
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.
Quad Differential LVECL/LVPECL
Buffer/Receivers
MAX9400/MAX9402/MAX9403/MAX9405
ABSOLUTE MAXIMUM RATINGS
V
CC
to V
EE
................................................................-0.3V to +6V
Inputs to V
EE
...............................................-0.3V to (V
CC
+ 0.3V)
Differential Input Voltage .......................................................±3V
Continuous Output Current .................................................50mA
Surge Output Current........................................................100mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin 5mm x 5mm TQFP
(derate 9.5mW/°C above +70°C) .................................761mW
32-Lead 5mm x 5mm QFN
(derate 21.3mW/°C above +70°C) ...................................1.7W
Junction-to-Ambient Thermal Resistance in Still Air
32-Pin 5mm x 5mm TQFP ........................................+105°C/W
32-Lead 5mm x 5mm QFN ........................................+47°C/W
Junction-to-Ambient Thermal Resistance with
500LFPM Airflow
32-Pin 5mm x 5mm TQFP .........................................+73°C/W
Junction-to-Case Thermal Resistance
32-Pin 5mm x 5mm TQFP .........................................+25°C/W
32-Lead 5mm x 5mm QFN .........................................+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 (Inputs and Outputs) ........................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 5.5V, MAX9400/MAX9403 outputs terminated with 50Ω ±1% to V
CC
- 2.0V. Typical values are at V
CC
- V
EE
=
3.3V, V
IHD
= V
CC
- 0.9V, V
ILD
= V
CC
- 1.7V, T
A
= +25°C, unless otherwise noted.) (Notes 1, 2, and 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
V
EE
+
1.4
V
EE
V
CC
- V
EE
< +3.0V
V
CC
- V
EE
≥
+3.0V
MAX9400/
MAX9402
Input Current
I
IH
, I
IL
MAX9403/
MAX9405
EN,
EN,
SEL,
SEL
, IN_, IN_,
CLK, or
CLK
= V
IHD
or V
ILD
EN,
EN,
SEL,
SEL,
CLK, or
CLK
= V
IHD
or V
ILD
0.2
0.2
-10
-10
86
TYP
MAX
UNITS
INPUTS (IN_,
IN_,
CLK,
CLK,
EN,
EN,
SEL,
SEL)
Differential Input High Voltage
Differential Input Low Voltage
V
IHD
V
ILD
Figure 1
Figure 1
V
CC
V
CC
-
0.2
V
CC
-
V
EE
3.0
25
µA
25
114
Ω
V
V
Differential Input Voltage
V
ID
Figure 1
V
Differential Input Resistance
OUTPUTS (OUT_,
OUT_)
Differential Output Voltage
Output Common-Mode Voltage
Internal Current Source
Output Impedance
POWER SUPPLY
Supply Current
R
IN
V
OH
-
V
OL
V
OCM
I
SINK
R
OUT
MAX9403/MAX9405
Figure 1
Figure 1
MAX9402/MAX9405, Figure 2
MAX9402/MAX9405, Figure 2
MAX9402/MAX9405
MAX9400/MAX9403
600
V
CC
-
1.5
6.5
40
660
V
CC
-
1.25
8.3
50
150
86
V
CC
-
1.1
10
60
180
118
mV
V
mA
Ω
I
EE
mA
2
_______________________________________________________________________________________
Quad Differential LVECL/LVPECL
Buffer/Receivers
AC ELECTRICAL CHARACTERISTICS
(V
CC
- V
EE
= 2.375V to 5.5V, outputs terminated with 50Ω ±1% to V
CC
- 2.0V, enabled, CLK = 3.2GHz, f
IN
= 1.6GHz, input transition
time = 125ps (20% to 80%), V
IHD
= V
EE
+ 1.2V to V
CC
, V
ILD
= V
EE
to V
CC
- 0.2V, V
IHD
- V
ILD
= 0.2V to smaller of |V
CC
- V
EE
| or 3V,
unless otherwise noted. Typical values are at V
CC
- V
EE
= 3.3V, V
IHD
= V
CC
- 0.9V, V
ILD
= V
CC
1.7V, T
A
= +25°C, unless otherwise
noted.) (Notes 1, 4)
PARAMETER
IN-to-OUT Differential
Propagation Delay
CLK-to-OUT Differential
Propagation Delay
IN-to-OUT Channel-to-Channel
Skew (Note 5)
CLK-to-OUT Channel-to-
Channel Skew (Note 5)
Maximum Clock Frequency
Maximum Data Frequency
Added Random Jitter (Note 6)
SYMBOL
t
PLH1
t
PHL1
t
PLH2
t
PHL2
t
SKD1
t
SKD2
f
CLK(MAX)
f
IN(MAX)
t
RJ
CONDITIONS
MAX9400/MAX9403
MAX9402/MAX9405
MAX9400/MAX9403
MAX9402/MAX9405
SEL = high
SEL = low
V
OH
- V
OL
≥
500mV, SEL = low
V
OH
- V
OL
≥
400mV, SEL = high
SEL = low, f
CLK
= 3.0GHz clock, f
IN
= 1.5GHz
SEL = high, f
IN
= 2GHz
SEL = low, f
CLK
= 3.0GHz, IN_ = 3.0Gbps
2
23
- 1 PRBS pattern
t
DJ
SEL = high, IN = 2.0Gbps 2
23
- 1 PRBS
pattern
Figure 4
Figure 4
Figure 3
Figure 3
80
80
80
80
0.2
120
120
1
3.0
2
0.64
0.74
17
40
1.3
1.5
30
ps
(P-P)
55
ps
ps
ps
ps
ps/°C
SEL = high, Figure 3
SEL = low, Figure 4
MIN
237
237
397
397
TYP
335
335
475
475
16
8
MAX
437
437
597
597
80
55
UNITS
ps
ps
ps
ps
GHz
GHZ
ps
(RMS)
MAX9400/MAX9402/MAX9403/MAX9405
Added Deterministic Jitter
(Note 6)
IN-to-CLK Setup Time
CLK-to-IN Hold Time
Output Rise Time
Output Fall Time
Propagation Delay Temperature
Coefficient
t
S
t
H
t
R
t
F
∆t
PD
/
∆T
Note 1:
Measurements are made with the device in thermal equilibrium.
Note 2:
Current into a pin is defined as positive. Current out of a pin is defined as negative.
Note 3:
DC parameters are production tested at +25°C. DC limits are guaranteed by design and characterization over the full oper-
ating temperature range.
Note 4:
Guaranteed by design and characterization. Limits are set to ±6 sigma.
Note 5:
Measured between outputs of the same part at the signal crossing points for a same-edge transition.
Note 6:
Device jitter added to the input signal.
_______________________________________________________________________________________
3
Quad Differential LVECL/LVPECL
Buffer/Receivers
MAX9400/MAX9402/MAX9403/MAX9405
Typical Operating Characteristics
(V
CC
- V
EE
= 3.3V, MAX9400, outputs terminated with 50Ω ±1% to V
CC
- 2.0V, enabled, SEL = high, CLK = 2.0GHz, f
IN
= 1.0GHz,
input transition time = 125ps (20% to 80%), V
IHD
= V
CC
- 1.0V, V
ILD
= V
CC
- 1.5V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT (I
EE
)
vs. TEMPERATURE
MAX9400 toc01
OUTPUT AMPLITUDE (V
OH
- V
OL
)
vs. IN_ FREQUENCY
MAX9400 toc02
OUTPUT RISE/FALL
vs. TEMPERATURE
MAX9400 toc03
95
1000
100
OUTPUT RISE/FALL TIME (ps)
OUTPUT AMPLITUDE (mV)
90
SUPPLY CURRENT (mA)
800
90
t
R
80
t
F
85
600
80
400
75
200
70
70
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
0
500
1000 1500 2000 2500 3000 3500
IN_ FREQUENCY (MHz)
60
-40
-15
10
35
60
85
TEMPERATURE (°C)
IN-TO-OUT PROPAGATION DELAY
vs. TEMPERATURE
MAX9400 toc04
CLK-TO-OUT PROPAGATION DELAY
vs. TEMPERATURE
MAX9400 toc05
355
350
PROPAGATION DELAY (ps)
345
340
335
330
325
-40
-15
10
35
60
t
PLH
t
PHL
520
PROPAGATION DELAY (ps)
500
480
t
PLH2
t
PHL2
460
440
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Quad Differential LVECL/LVPECL
Buffer/Receivers
Pin Description
PIN
1, 8,11,
17, 24, 30
2
3
4
5
6
7
9
10
12
13
14, 20,
21, 27
15
16
18
19
22
23
25
26
28
29
31
32
—
NAME
V
CC
FUNCTION
Positive Supply Voltage. Bypass V
CC
to V
EE
with 0.1µF and 0.01µF ceramic capacitors. Place the
capacitors as close to the device as possible with the smaller value capacitor closest to the device.
Noninverting Differential Select Input. Setting SEL = high and
SEL
= low (differential high) enables all four
channels to operate asynchronously. Setting SEL = low and
SEL
= high (differential low) enables all four
channels to operate in synchronous mode.
Inverting Differential Select Input
Noninverting Differential Clock Input
Inverting Differential Clock Input. A rising edge on CLK (and falling on
CLK)
transfers data from the inputs
to the outputs when SEL = low.
Noninverting Differential Output Enable Input. Setting EN = high and
EN
= low (differential high) enables
the outputs. Setting EN = low and
EN
= high (differential low) drives outputs low.
Inverting Differential Output Enable Input
Noninverting Differential Input 3
Inverting Differential Input 3
Inverting Differential Output 3
Noninverting Differential Output 3
Negative Supply Voltage
Noninverting Differential Input 2
Inverting Differential Input 2
Inverting Differential Output 2
Noninverting Differential Output 2
Noninverting Differential Output 1
Inverting Differential Output 1
Inverting Differential Input 1
Noninverting Differential Input 1
Noninverting Differential Output 0
Inverting Differential Output 0
Inverting Differential Input 0
Noninverting Differential Input 0
Exposed Paddle (MAX940_EGJ only). Connected to V
EE
internally. See package dimensions.
MAX9400/MAX9402/MAX9403/MAX9405
SEL
SEL
CLK
CLK
EN
EN
IN3
IN3
OUT3
OUT3
V
EE
IN2
IN2
OUT2
OUT2
OUT1
OUT1
IN1
IN1
OUT0
OUT0
IN0
IN0
EP
_______________________________________________________________________________________
5
