SY54023R
Low Voltage 1.2V/1.8V CML 2x2 Crosspoint
Switch with Fail-Safe Inputs, 3.2Gbps,
2.5GHz
General Description
The SY54023R is a fully differential, low voltage
1.2V/1.8V CML 2x2 Crosspoint Switch with Fail Safe
Inputs. The SY54023R can process clock signals as
fast as 2.5GHz or data patterns up to 3.2Gbps.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that interfaces to LVPECL,
LVDS or CML differential signals, (AC- or DC-coupled
from a 2.5V driver) as small as 100mV (200mV
PP
)
without any level-shifting or termination resistor
networks in the signal path. For AC-coupled input
interface applications, an internal voltage reference is
provided to bias the V
T
pin. The outputs are CML, with
extremely fast rise/fall times guaranteed to be less than
95ps.
The SY54023R operates from a 2.5V ±5% core supply
and a 1.8V or 1.2V ±5% output supply and is
guaranteed over the full industrial temperature range (–
40°C to +85°C). The SY54023R is part of Micrel’s high-
®
speed, Precision Edge product line.
Datasheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Precision Edge
®
Features
•
1.2V/1.8V CML 2x2 Crosspoint Switch with Fail Safe
Inputs
•
Guaranteed AC performance over temperature and
voltage:
– DC-to- > 3.2Gbps throughput
– <400ps propagation delay (IN-to-Q)
– <15ps Output Skew
– <95ps rise/fall times
•
Ultra-low jitter design
– <1ps
RMS
cycle-to-cycle jitter
– <10ps
PP
total jitter
– <1ps
RMS
random jitter
– <10ps
PP
deterministic jitter
•
High-speed CML outputs
•
2.5V ±5% , 1.8/1.2V ±5% power supply operation
•
Industrial temperature range: –40°C to +85°C
•
Available in 16-pin (3mm x 3mm) QFN package
Functional Block Diagram
Applications
•
•
•
•
Data Distribution: OC-48, OC-48+FEC
SONET clock and data distribution
Fibre Channel clock and data distribution
Gigabit Ethernet clock and data distribution
Markets
•
•
•
•
•
•
•
Storage
ATE
Test and measurement
Enterprise networking equipment
High-end servers
Access
Metro area network equipment
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2008
M9999-033108-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY54023R
Ordering Information
(1)
Part Number
SY54023RMG
SY54023RMGTR
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
(2)
Package
Type
QFN-16
QFN-16
Operating
Range
Industrial
Industrial
Package Marking
023R
with Pb-Free bar-line indicator
023R
with Pb-Free bar-line indicator
Lead
Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
16-Pin QFN
March 2008
2
M9999-033108-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY54023R
Pin Description
Pin Number
16,1
4,5
Pin Name
IN0, /IN0
IN1,/IN1
Pin Function
Differential Inputs: These input pairs are the differential signal inputs to the device. They
accept differential signals as small as 100mV (200mV
PP
). Each input pin internally terminates
with 50Ω
to the VT pin. If the input swing falls below a certain threshold (typical 30mV), the
Fail-Safe Input (FSI) feature will guarantee a stable output by latching the output to its last
valid state.
Input Termination Center-Tap: Each side of the differential input pair terminates to VT pin.
This pin provides a center-tap to a termination network for maximum interface flexibility. An
internal high impedance resistor divider biases VT to allow input AC-coupling. For AC-
coupling, bypass VT with a 0.1µF low ESR capacitor to VCC. See “Interface Applications”
subsection and Figure 2a.
These single-ended TTL/CMOS-compatible inputs select the inputs of the crosspoint switch.
Note that these inputs are internally connected to a 25kΩ
pull-up
resistor and will default to a
logic HIGH state if left open.
Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the V
CC
pin as possible. Supplies input and core circuitry.
Output Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the V
CCO
pins as
possible. Supplies the output buffers.
Ground: Exposed pad must be connected to a ground plane that is the same potential as the
ground pin.
CML Differential Output Pairs: Differential buffered copies of the input signal. The output
swing is typically 390mV. See “Interface Applications” subsection for termination information.
2
3
VT0
VT1
15
6
7
8,13
14
12,11
10,9
SEL0
SEL1
VCC
VCCO
GND,
Exposed pad
Q0, /Q0
Q1, /Q1
Truth Table
SEL0
L
L
H
H
SEL1
L
H
L
H
Q0
IN0
IN0
IN1
IN1
Q1
IN0
IN1
IN0
IN1
March 2008
3
M9999-033108-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY54023R
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) ............................... –0.5V to +3.0V
Supply Voltage (V
CCO
) ............................. –0.5V to +2.7V
V
CC
- V
CCO
.........................................................<1.8V
V
CCO
- V
CC
.........................................................<0.5V
Input Voltage (V
IN
) ....................................... –0.5V to V
CC
CML Output Voltage (V
OUT
) ............... 0.6V to V
CCO
+0.5V
Current (V
T
)
Source or sink current on VT pin ................. ±100mA
Input Current
Source or sink current on (IN, /IN) ................. ±50mA
Maximum operating Junction Temperature .......... 125°C
Lead Temperature (soldering, 20sec.) .................. 260°C
Storage Temperature (T
s
) .................... –65°C to +150°C
Operating Ratings
(2)
Supply Voltage (V
CC
) .......................... 2.375V to 2.625V
(V
CCO
)………………....….1.14V to 1.9V
Ambient Temperature (T
A
) ................... –40°C to +85°C
(3)
Package Thermal Resistance
QFN
Still-air (θ
JA
) ............................................ 75°C/W
Junction-to-board (ψ
JB
) .......................... 33°C/W
DC Electrical Characteristics
(4)
T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
CC
Parameter
Power Supply Voltage Range
Condition
V
CC
V
CCO
V
CCO
Max. V
CC
No Load. Max V
CCO
45
90
IN, /IN
V
IL
with V
IH
= 1.2V
IN, /IN
V
IL
with V
IH
= 1.14V, (1.2V-5%)
see Figure 3a
see Figure 3b
1.2
0.2
1.14
0.66
0.1
0.2
30
Min
2.375
1.14
1.7
Typ
2.5
1.2
1.8
42
32
50
100
Max
2.625
1.26
1.9
55
42
55
110
V
CC
V
IH
–0.1
V
CC
V
IH
–0.1
1.0
2.0
100
1.28
Units
V
V
V
mA
mA
Ω
Ω
V
V
V
V
V
V
mV
V
I
CC
I
CCO
R
IN
R
DIFF_IN
V
IH
V
IL
V
IH
V
IL
V
IN
V
DIFF_IN
V
IN_FSI
V
T_IN
Notes:
Power Supply Current
Power Supply Current
Input Resistance
(IN-to-V
T
, /IN-to-V
T
)
Differential Input Resistance
(IN-to-/IN)
Input HIGH Voltage
(IN, /IN)
Input LOW Voltage
(IN, /IN)
Input HIGH Voltage
(IN, /IN)
Input LOW Voltage
(IN, /IN)
Input Voltage Swing
(IN, /IN)
Differential Input Voltage Swing
(|IN - /IN|)
Input Voltage Threshold that
Triggers FSI
Voltage from Input to V
T
1. 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 ratings conditions
for extended periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB.
ψ
JB
and
θ
JA
values are determined for a 4-layer board in still-air number, unless otherwise stated.
4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
March 2008
4
M9999-033108-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY54023R
CML Outputs DC Electrical Characteristics
(5)
V
CCO
= 1.14V to 1.26V R
L
= 50Ω
to V
CCO,
V
CCO
= 1.7V to 1.9V, R
L
= 50Ω
to V
CCO
or 100Ω
across the outputs,
V
CC
= 2.375V to 2.625V. T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
OH
V
OUT
V
DIFF_OUT
R
OUT
Parameter
Output HIGH Voltage
Output Voltage Swing
Differential Output Voltage Swing
Output Source Impedance
Condition
R
L
= 50Ω
to V
CCO
See Figure 3a
See Figure 3b
Min
V
CCO
-0.020
300
600
45
Typ
V
CCO
-0.010
390
780
50
Max
V
CCO
475
950
55
Units
V
mV
mV
Ω
LVTTL/CMOS DC Electrical Characteristics
(5)
V
CC
= 2.5V ±5%; V
CCO
= +1.14V to +1.26V or +1.7V to +1.9V; T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
IH
V
IL
I
IH
I
IL
Note:
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Condition
Min
2.0
-125
-300
Typ
Max
V
CC
0.8
30
Units
V
V
µA
µA
March 2008
5
M9999-033108-A
hbwhelp@micrel.com
or (408) 955-1690
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