MAXIM MAX3681 Technical data
_________________General Description
The MAX3681 deserializer is ideal for converting
622Mbps serial data to 4-bit-wide, 155Mbps parallel
data in ATM and SDH/SONET applications. Operating
from a single +3.3V supply, this device accepts PECL
serial clock and data inputs, and delivers low-voltage
differential-signal (LVDS) clock and data outputs for
interfacing with high-speed digital circuitry. It also provides an LVDS synchronization input that enables data
realignment and reframing.
The MAX3681 is available in the extended-industrial
temperature range (-40°C to +85°C), in a 24-pin SSOP
package.
__________________________Applications
622Mbps SDH/SONET Transmission Systems
622Mbps ATM/SONET Access Nodes
Add/Drop Multiplexers
Digital Cross Connects
______________________________Features
♦ Single +3.3V Supply
♦ 622Mbps Serial to 155Mbps Parallel Conversion
♦ 265mW Power
♦ LVDS Data Outputs and Synchronization Inputs
♦ Synchronization Input for Data Realignment and
Reframing
♦ Differential 3.3V PECL Clock and Data Inputs
MAX3681
+3.3V, 622Mbps, SDH/SONET
1:4 Deserializer with LVDS Outputs
________________________________________________________________ Maxim Integrated Products 1
MAX3675
MAX3664
MAX3681
DATA
AND
CLOCK
RECOVERY
OVERHEAD
TERMINATION
LIMITING
AMP
PREAMP
100Ω
100Ω*
100Ω*
100Ω*
100Ω*
100Ω*
PHOTODIODE
VCC = +3.3V
V
CC
= +3.3V
PD3+
PD3-
PD2+
PD2-
PD1+
PD1-
PD0+
PD0-
PCLK+
PCLK-
SYNC+
SYNC-
SD+
SD-
*REQUIRED ONLY IF OVERHEAD CIRCUIT DOES NOT INCLUDE INTERNAL INPUT TERMINATION.
THIS SYMBOL REPRESENTS A TRANSMISSION LINE OF CHARACTERISTIC IMPEDANCE Z0 = 50Ω.
V
CC
GND
130Ω 130Ω
82Ω 82Ω
VCC = +3.3V
130Ω 130Ω
82Ω 82Ω
VCC = +3.3V
SCLK+
SCLK-
___________________________________________________________________Typical Operating Circuit
19-1091; Rev 1; 5/04
PART
MAX3681EAG -40°C to +85°C
TEMP RANGE PIN-PACKAGE
24 SSOP
EVALUATION KIT
AVAILABLE
________________Ordering Information
+Denotes Lead Free Package
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.
MAX3681EAG+ -40°C to +85°C 24 SSOP
Pin Configuration appears at end of data sheet.
MAX3681
+3.3V, 622Mbps, SDH/SONET
1:4 Deserializer with LVDS Outputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, differential loads = 100Ω, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V,
T
A
= +25°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.
Note 1: AC Characteristics guaranteed by design and characterization.
Terminal Voltage (with respect to GND)
V
CC
...........................................................................-0.5V to 5V
PECL Inputs (SD+/-, SCLK+/-).................................V
CC
+ 0.5V
LVDS Inputs (SYNC+/-)............................................V
CC
+ 0.5V
Output Current, LVDS Outputs (PCLK+/-, PD_+/-) .............10mA
Continuous Power Dissipation (T
A
= +85°C)
SSOP (derate 8.00mW/°C above +85°C) ......................520mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
TA= +25°C
Common-mode voltage = 50mV
Differential input voltage = 100mV
VIN= V
IH(MAX)
VIN= V
IL(MAX)
CONDITIONS
%±1 ±10ΔR
O
Change in Magnitude of SingleEnded Output Resistance for
Complementary States
Ω40 70 140R
O
Single-Ended Output Resistance
mV25ΔV
OS
Change in Magnitude of Output
Offset Voltage for Complementary
States
V1.125 1.275V
OS
Output Offset Voltage
mV25ΔV
OD
Change in Magnitude of Differential
Output Voltage for Complementary
States
mV250 400V
OD
Differential Output Voltage
V0.925V
OL
Output Low Voltage
V1.475V
OH
Output High Voltage
VVCC- 1.16 VCC- 0.88V
IH
Input High Voltage
mA55 80 120I
CC
Supply Current
Ω85 100 115R
IN
Differential Input Resistance
mV70V
HYST
Threshold Hysteresis
mV-100 100V
IDTH
Differential Input Threshold
V0 2.4V
I
Input Voltage Range
VVCC- 1.81 VCC- 1.48V
IL
Input Low Voltage
µA-10 10I
IH
Input High Current
µA-10 10I
IL
Input Low Current
UNITSMIN TYP MAXSYMBOLPARAMETER
CONDITIONS
ps50t
H
Serial Data Hold Time
ps800t
SU
MHz622f
SCLK
Maximum Serial Clock Frequency
Serial Data Setup Time
ps200 550 900t
CLK-Q
Parallel Clock to Data Output Delay
UNITSMIN TYP MAXSYMBOLPARAMETER
PECL INPUTS (SD+/-, SCLK+/-)
LVDS INPUTS AND OUTPUTS (SYNC+/-, PCLK+/-, PD_+/-)
AC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, differential loads = 100Ω, TA= +25°C, unless otherwise noted.) (Note 1)
MAX3681
+3.3V, 622Mbps, SDH/SONET
1:4 Deserializer with LVDS Outputs
_______________________________________________________________________________________ 3
1.8
0
MAXIMUM SERIAL CLOCK FREQUENCY
vs. TEMPERATURE
MAX3681-01
MAX SERIAL CLOCK FREQUENCY (GHz)
-25
1.6
25 50
1.4
1.2
1.0
75
100
TEMPERATURE (°C)
2.0
-50
VCC = 3.0V
VCC = 3.6V
0
SUPPLY CURRENT
vs. TEMPERATURE
MAX3681-02
SUPPLY CURRENT (mA)
-25
100
25 50
80
60
40
75
100
TEMPERATURE (°C)
120
-50
VCC = +3.0V
VCC = +3.6V
VCC = +3.3V
360
0
SERIAL DATA-SETUP TIME
vs. TEMPERATURE
MAX3681-03
SERIAL DATA-SETUP TIME (ps)
-25
320
25 50
280
240
200
75
100
TEMPERATURE (°C)
400
-50
-140
0
SERIAL DATA-HOLD TIME
vs. TEMPERATURE
MAX3681-04
SERIAL DATA-HOLD TIME (ps)
-25
-180
25 50
-220
-260
-300
75
100
TEMPERATURE (°C)
-100
-50
650
0
PARALLEL CLOCK TO DATA
OUTPUT PROPAGATION DELAY
vs. TEMPERATURE
MAX3681-05
PARALLEL CLOCK TO DATA
PROPAGATION DELAY (ps)
-25
600
25 50
550
500
450
75
100
TEMPERATURE (°C)
700
-50
__________________________________________Typical Operating Characteristics
(VCC= +3.0V to +3.6V, differential loads = 100Ω, unless otherwise noted.)
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