Micrel, Inc.
DUAL CML/PECL/LVPECL-to-LVDS
TRANSLATOR
SuperLite™
SY55855V
SuperLite™
SY55855V
FEATURES
s
Guaranteed f
MAX
>750MHz over temperature
s
1.5Gbps throughput capability
s
3.0V to 5.7V power supply
s
Guaranteed <700ps propagation delay over
temperature
s
Guaranteed <50ps within-device skew over
temperature
s
LVDS compatible outputs
s
Fully differential I/O architecture
s
Wide operating temperature range: –40
°
C to +85
°
C
s
Available in a tiny 10-pin MSOP package
SuperLite™
DESCRIPTION
The SY55855V is a fully differential, CML/PECL/
LVPECL-to-LVDS translator. It achieves LVDS signaling
up to 1.5Gbps, depending on the distance and the
characteristics of the media and noise coupling sources.
LVDS is intended to drive 50Ω impedance transmission
line media such as PCB traces, backplanes, or cables.
SY55855V inputs can be terminated with a single
resistor between the true and the complement pins of a
given input.
The SY55855V is a member of Micrel’s new
SuperLite™ family of high-speed logic devices. This family
features very small packaging, high signal integrity, and
operation at many different supply voltages.
FUNCTIONAL BLOCK DIAGRAM
s
s
s
s
APPLICATIONS
High-speed logic
Data communications systems
Wireless communications systems
Telecom systems
D0
/D0
Q0
/Q0
D1
/D1
Q1
/Q1
SuperLite is a trademark of Micrel, Inc.
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
Rev.: D
Amendment: /0
1
Issue Date: November 2005
Micrel, Inc.
SuperLite™
SY55855V
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
D0 1
/D0 2
D1 3
/D1 4
GND 5
10 VCC
9 Q0
8 /Q0
7 Q1
6 /Q1
Part Number
SY55855VKI
SY55855VKITR
(2)
SY55855VKG
(3)
SY55855VKGTR
(2, 3)
Package
Type
K10-1
K10-1
K10-1
K10-1
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package
Marking
855V
855V
Lead
Finish
Sn-Pb
Sn-Pb
855V with
NiPdAu
Pb-Free bar line indicator Pb-Free
855V with
NiPdAu
Pb-Free bar line indicator Pb-Free
10-Pin MSOP (K10-1)
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
PIN DESCRIPTION
Pin Number
1, 2
3, 4
5
6, 7
8, 9
10
Pin Name
D0, /D0
D1, /D1
GND
/Q1, Q1
/Q0, Q0
V
CC
Pin Function
CML/PECL/LVPECL Input (Differential). This is one of the inputs. It is converted to
LVDS onto the Q0 and /Q0 outputs.
CML/PECL/LVPECL Input (Differential). This is the other input. It is converted to
LVDS onto the Q1 and /Q1 outputs.
Ground.
LVDS Output (Differential). This is the other LVDS output. It buffers the CML input
that appears at D1, /D1.
LVDS Output (Differential). This is one LVDS output. It buffers the CML input that
appears at D0, /D0.
V
CC
TRUTH TABLE
D0
0
0
1
1
D1
0
1
0
1
Q0
0
0
1
1
/Q0
1
1
0
0
Q1
0
1
0
1
/Q1
1
0
1
0
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SuperLite™
SY55855V
FUNCTIONAL DESCRIPTION
Establishing Static Logic Inputs
The true pin of an input pair is internally biased to ground
through a 75kΩ resistor. The complement pin of an input
pair is internally biased halfway between V
CC
and ground
by a voltage divider consisting of two 75kΩ resistors. In this
way, unconnected inputs appear as logic zeros. To keep an
input at static logic zero at V
CC
> 3.0V, leave both inputs
unconnected. For V
CC
≤
3.0V, connect the complement input
to V
CC
and leave the true input unconnected. To make an
input static logic one, connect the true input to V
CC
, leave
the complement input unconnected. These are the only two
safe ways to cause inputs to be at a static value. In particular,
no input pin should be directly connected to ground. All NC
(no connect) pins should be unconnected.
V
CC
NC
X
/X
NC
NC
X
/X
Figure 1. Hard Wiring a Logic “1”
(1)
Note 1.
X is either D0 or D1 input. /X is either /D0 or /D1 input.
V
CC
> 3.0V
NC
V
CC
X
/X
V
CC
≤
3.0V
Figure 2. Hard Wiring a Logic “0”
(1)
Note 1.
X is either D0 or D1 input. /X is either /D0 or /D1 input.
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SuperLite™
SY55855V
LVDS OUTPUTS
LVDS stands for Low Voltage Differential Swing. LVDS
specifies a small swing of 350mV typical, on a nominal
1.25V common mode above ground. The common mode
voltage has tight limits to permit large variations in ground
between an LVDS driver and receiver. Also, change in
common mode voltage, as a function of data input, is also
kept tight, to keep EMI low.
50Ω
50Ω
v
OH
, v
OL
v
OD
100Ω
±1%
v
OH
, v
OL
49.9Ω,
±1%
v
OCM
,
∆v
OCM
49.9Ω,
±1%
GND
Figure 4. LVDS Common Mode Measurement
50Ω
GND
50Ω
100Ω
Figure 3. LVDS Differential Measurement
Figure 5. LVDS Output Termination
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SuperLite™
SY55855V
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
IN
I
OUT
T
A
T
LEAD
T
store
Note 1.
Rating
Power Supply Voltage
Input Voltage
LVDS Output Current
Operating Temperature Range
Lead Temperature (soldering, 20sec.)
Storage Temperature Range
Value
–0.5 to +6.0
–0.5 to V
CC
+0.5
±10%
–40 to +85
260
–65 to +150
Unit
V
V
mA
°C
°C
°C
Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions
for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
V
CC
= 3.0V to 5.7V; GND = 0V; T
A
= –40°C to +85°C
(2)
T
A
= –40
°
C
Symbol
V
CC
I
CC
Parameter
Power Supply Voltage
Power Supply Current
3.6V <V
CC
<5.7V
V
CC
≤3.6V
Min.
3.0
—
—
Max.
5.7
80
50
Min.
3.0
—
—
T
A
= +25
°
C
Typ.
—
—
30
Max.
5.7
80
50
T
A
= +85
°
C
Min.
3.0
—
—
Max.
5.7
80
50
Unit
V
mA
CML DC ELECTRICAL CHARACTERISTICS
V
CC
= 3.0V to 5.7V; GND = 0V; T
A
= –40°C to +85°C
(2)
Symbol
V
ID
V
IH
V
IL
Parameter
Differential Input Voltage
Input HIGH Voltage
Input LOW Voltage
Min.
100
1.6
1.5
Typ.
—
—
—
Max.
—
V
CC
V
CC
– 0.1
Unit
mV
V
V
Condition
LVDS DC ELECTRICAL CHARACTERISTICS
V
CC
= 3.0V to 5.7V; GND = 0V; T
A
= –40°C to +85°C
(2)
Symbol
V
OD
V
OCM
∆V
OCM
V
OH
V
OL
Note 2.
Note 3.
Note 4.
Note 5.
Parameter
Differential Output Voltage
(4)
Output Common Mode
Voltage
(3)
Change in Common Mode
Voltage
(3)
Output HIGH Voltage
(4), (5)
Output LOW Voltage
(4), (5)
Min.
250
1.125
–50
—
0.925
Typ.
—
—
—
—
—
Max.
450
1.375
+50
1.474
—
Unit
mV
V
mV
V
V
Condition
100Ω Termination
I
OH
= –4.0mA
I
OL
= 4.0mA
Equilibrium temperature.
Measured as per Figure 4.
Measured as per Figure 3.
Do not short output to GND.
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
5
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