SY89833AL
3.3V Low Noise Ultra-Precision 1:4 LVDS
Fanout Buffer/Translator with Internal
Termination
General Description
The SY89833AL is a lower noise version of the SY89833L
3.3V, high-speed 2GHz Low Voltage Differential Swing
(LVDS) 1:4 fanout buffer. Within device skew is
guaranteed to be less than 20ps over supply voltage and
temperature.
The differential input buffer has a unique internal
termination design that allows access to the termination
network through a VT pin. This feature allows the device to
easily interface to different logic standards. A VREF-AC
reference is included for AC-coupled applications.
The SY89833AL is part of Micrel’s high-speed clock
synchronization family. For 2.5V applications, the
SY89832U provides similar functionality while operating
from a 2.5V ±5% supply. For applications that require a
different I/O combination, consult the Micrel website at:
www.micrel.com, and choose from a comprehensive
product line of high-speed, low-skew fanout buffers,
translators and clock generators. Datasheets and support
documentation can be found on Micrel’s web site at:
www.micrel.com.
Precision Edge
®
Features
•
Guaranteed AC performance over temperature
and voltage:
– DC-to > 2GHz throughput
– <470ps propagation delay (IN-to-Q)
– <20ps within-device skew
– <190ps rise/fall times
•
Improved Ultra-low jitter design:
– <1ps
RMS
cycle-to-cycle jitter
– <10ps
PP
total jitter
– <1ps
RMS
random jitter
– <10ps
PP
deterministic jitter
– <0.635ps @ 156.25MHz (Integrated from 12kHz to
20MHz)
•
Unique input termination and VT pin accepts DC- and
AC-coupled inputs
•
High-speed LVDS outputs
•
3.3V power supply operation
•
Industrial temperature range: –40°C to +85°C
•
Available in 16-pin (3mm x 3mm) QFN package
Functional Block Diagram
Applications
•
•
•
•
Processor clock distribution
SONET clock distribution
Fibre Channel clock distribution
Gigabit Ethernet clock distribution
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 2009
M9999-032609-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY89833AL
Ordering Information
(1)
Part Number
SY89833ALMI
SY89833ALMITR
SY89833ALMG
(3)
(2)
Package
Type
QFN-16
QFN-16
QFN-16
(2, 3)
Operating Range
Industrial
Industrial
Industrial
Industrial
Package Marking
833A
833A
833A with
Pb-Free bar-line indicator
833A with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
NiPdAu
Pb-Free
NiPdAu
Pb-Free
SY89833ALMGTR
Notes:
QFN-16
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 is recommended for new designs.
Pin Configuration
16-Pin
Truth Table
IN
0
1
X
Note:
1. On next negative transition of the input signal (IN).
/IN
1
0
X
EN
1
1
0
Q
0
1
0
(1)
/Q
1
0
1
(1)
March 2009
2
M9999-032609-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY89833AL
Pin Description
Pin Number
15, 16
1, 2
3, 4
5, 6
8
Pin Name
Q0, /Q0
Q1, /Q1
Q2, /Q2
Q3, /Q3
EN
This single-ended TTL/CMOS-compatible input functions as a synchronous
output enable. The synchronous enable ensures that enable/disable will only
occur when the outputs are in a logic LOW state. Note that this input is internally
connected to a 25kΩ pull-up resistor and will default to logic HIGH state
(enabled) if left open.
Differential Input: This input pair is the differential signal input to the device.
Input accepts AC- or DC-Coupled differential signals as small as 100mV. Each
pin of the pair internally terminates to a VT pin through 50Ω. Note that this input
will default to an intermediate state if left open. Please refer to the “Input
Interface Applications” section for more details.
Reference Voltage: This output biases to V
CC
–1.4V. It is used when AC-
Coupling the input (IN, /IN). For AC-Coupled applications, connect VREF-AC to
VT pin and bypass with 0.1µF low ESR capacitor to V
CC
. See “Input Interface
Applications” section for more details. Maximum sink/source current is ±1.5mA.
Due to the limited drive capability, each VREF-AC pin is only intended to drive its
respective VT pin.
Input Termination Center-Tap: Each side of the differential input pair terminates
to the VT pin. The VT pin provides a center-tap to a termination network for
maximum interface flexibility. See “Input Interface Applications” section for more
details.
Ground. GND pin and exposed pad must be connected to the most negative
potential of the device ground.
Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors and
place as close to each VCC pin as possible.
Pin Function
LVDS Differential Outputs: Normally terminated with 100Ω across the pair (Q,
/Q). See “LVDS Outputs” section, Figure 2a. Unused outputs should be
terminated with a 100Ω resistor across each pair.
9, 12
/IN, IN
10
VREF-AC
11
VT
13
7, 14
GND
VCC
March 2009
3
M9999-032609-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY89833AL
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
).................................... –0.5V to +4.0V
Input Voltage (V
IN
) ................................. –0.5V to V
CC
+0.3V
LVDS Output Current (I
OUT
).......................................±10mA
Input Current
Source or Sink Current on (IN, /IN) ....................±50mA
V
T
Current
Source or Sink Current on (V
T
)............. ……….±100mA
V
REF-AC
Current
Source or Sink Current on (V
REF-AC
) .....................±2mA
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
).................................. +3.0V to +3.60V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Resistance
(3)
QFN (θ
JA
)
Still-Air.........................................................75°C/W
QFN (ψ
JB
)...........................................................33°C/W
Electrical Characteristics
(4)
T
A
= –40°C to +85°C, unless otherwise noted.
Symbol
V
CC
I
CC
R
IN
R
DIFF-IN
V
IH
V
IL
V
IN
V
DIFF_IN
|IIN|
V
REF-AC
Parameter
Power Supply Voltage Range
Power Supply Current
Input Resistance (IN-to-VT)
Differential Input Resistance
(IN-to-/IN)
Input HIGH Voltage
(IN-to-/IN)
Input LOW Voltage
(IN-to-/IN)
Input Voltage Swing
(IN-to-/IN)
Differential Input Voltage
Input Current
(IN, /IN)
Reference Voltage
See Figure 2c.
See Figure 2d.
Note 5
V
CC
–1.525
V
CC
–1.425
No load, max. V
CC
.
45
90
1.2
0
0.1
0.2
45
V
CC
–1.325
Condition
Min
3.0
Typ
3.3
75
50
100
Max
3.6
100
55
110
V
CC
V
IH
–0.1
1.7
Units
V
mA
Ω
Ω
V
V
V
V
mA
V
Notes:
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 rating 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.
5. Due to the internal termination (see "Input Stage" section) the input current depends on the applied voltages at IN, /IN and VT inputs. Do not apply a
combination of voltages that causes the input current to exceed the maximum limit!
March 2009
4
M9999-032609-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY89833AL
LVDS Outputs DC Electrical Characteristics
(6)
V
CC
= 3.3V ±10%, R
L
= 100Ω across the output, T
A
= –40°C to +85°C, unless otherwise noted.
Symbol
V
OUT
V
DIFF_OUT
V
OCM
ΔV
OCM
Parameter
Output Voltage Swing
Differential Output Voltage Swing
Output Common Mode Voltage
Change in Common Mode Voltage
Condition
See Figure 2c.
See Figure 2d.
Min
250
500
1.125
–50
Typ
325
650
1.275
50
Max
Units
mV
mV
V
mV
LVTTL/CMOS DC Electrical Characteristics
(6)
V
CC
= 3.3V ±10%, T
A
= –40°C to +85°C, unless otherwise noted.
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Condition
Min
2.0
0
–125
–300
Typ
Max
V
CC
0.8
30
Units
V
V
µA
µA
Notes:
6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
March 2009
5
M9999-032609-A
hbwhelp@micrel.com
or (408) 955-1690
stm32/stm8
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