Micrel, Inc.
ULTRA-PRECISION 1:4 LVPECL
FANOUT BUFFER/TRANSLATOR
WITH INTERNAL TERMINATION
Precision Edge®
SY89831U
Precision Edge
®
SY89831U
FEATURES
■
Guaranteed AC performance over temperature
and voltage:
• DC-to > 2.0GHz throughput
• <450ps propagation delay (IN-to-Q)
• < 20ps within-device skew
• < 225ps rise/fall time
■
Ultra-low jitter design:
• < 62fs RMS phase jitter (Typ)
■
Unique patent-pending input termination and VT pin
accepts DC- and AC-coupled differential inputs
■
800mV, 100K LVPECL output swing
■
Power supply 2.5V ±5% or 3.3V ±10%
■
Industrial temperature range: –40°C to +85°C
■
Available in 16-pin (3mm x 3mm) MLF
®
package
Precision Edge
®
DESCRIPTION
The SY89831U is a high-speed, 2GHz differential LVPECL
1:4 fanout buffer optimized for ultra-low skew applications.
Within device skew is guaranteed to be less than 20ps (5ps
typ.) 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 output is included for
AC-coupled applications.
The SY89831U is a part of Micrel's high-speed clock
synchronization family. For applications that require a
different I/O combination, consult Micrel’s website at: www.
micrel.com, and choose from a comprehensive product line
of high-speed, low-skew fanout buffers, translators and clock
generators.
APPLICATIONS
■
■
■
■
Processor clock distribution
SONET clock distribution
Fibre Channel clock distribution
Gigabit Ethernet clock distribution
FUNCTIONAL BLOCK DIAGRAM
TYPICAL PERFORMANCE
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame
and MLF are registered trademarks of Amkor Technology, Inc.
M9999-072210
hbwhelp@micrel.com or (408) 955-1690
1
Rev.: F
Amendment: /0
Issue Date: July 2010
Micrel, Inc.
Precision Edge®
SY89831U
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
Part Number
SY89831UMI
SY89831UMITR
(2)
SY89831UMG
(3)
SY89831UMGTR
(2, 3)
Package
Type
MLF-16
MLF-16
MLF-16
MLF-16
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package
Marking
831U
831U
831U with Pb-Free
bar-line indicator
831U with Pb-Free
bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
NiPdAu
Pb-Free
NiPdAu
Pb-Free
16-Pin MLF
®
(MLF-16)
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 is recommended for new designs.
PIN DESCRIPTION
Pin Number
15, 16
1, 2,
3, 4,
5, 6
8
Pin Name
Q0, /Q0
Q1, /Q1
Q2, /Q2
Q3, /Q3
EN
Pin Function
Differential 100K LVPECL Outputs: These LVPECL outputs are the precision, low skew copies
of the inputs. Please refer to the “Truth Table” section for details. Unused output pairs may be
left open. Terminate wtih 50½ to V
CC
–2V. See “Output Termination Recommendations” section
for more details.
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 25k½ pull-up resistor and will default
to logic HIGH state (enabled) if left open.
Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs
accept AC- or DC-Coupled differential signs as small as 100mV. Each pin of a pair internally
terminates to a VT pin through 50½. Note that these inputs will default to an intermediate state if
left open. Pleae refer to the “Input Interface Applications” section for more details.
Reference Voltage: These outputs bias to V
CC
–1.4V. They are used when AC coupling the
inputs (IN, /IN). For AC-Coupled applications, connect VREF-AC to VT pin and bypass with
0.01µF 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. If VREF-AC is used with a 2.5V supply, make
sure input swing is large enough to not violate V
IH
min. spec.
9, 12
/IN, IN
10
VREF–AC
11
13
7, 14
VT
GND
VCC
Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The
VT pins provide a center-tap to a termination network for maximum interface flexibility. See “Input
Interface Applications” section for more detaiils.
Ground. GND pins 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.
TRUTH TABLE
IN
0
1
X
/IN
1
0
X
EN
1
1
0
Q
0
1
0
(1)
/Q
1
0
1
(1)
Note:
1.
On next negative transition of the input signal (IN).
M9999-072210
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
Precision Edge®
SY89831U
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
)....................................–0.5V to +4.0V
Input Voltage (V
IN
) .................................–0.5V to V
CC
+0.5V
LVPECL Output Current (I
OUT
)
Continuous.......................................................... 50mA
Surge ................................................................ 100mA
Input Current
Source or Sink Current on (IN, /IN)................... ±50mA
VREF-AC Current
Source or Sink Current on (I
VT
) .......................... ±2mA
Lead Temperature (soldering, 20sec.) ....................... 260°C
Storage Temperature (T
S
) ........................ –65°C to +150°C
Operating Ratings
(2)
Supply Voltage Range ......................... +2.375V to +2.625V
............................................................. +3.0V to +3.6V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Package Thermal Resistance
(3)
MLF™
(θ
JA
) Still-Air
......................................................................
60°C/W
(Ψ
JB
) Junction-to-Board ...................................... 32°C/W
DC ELECTRICAL CHARACTERISTICS
(4)
T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
CC
I
CC
Parameter
Power Supply
Power Supply Current
Input Resistance (IN-to-VT)
Differential Input Resistance
(IN-to-/IN)
Input HIGH Voltage (IN, /IN)
Input LOW Voltage (IN, /IN)
Input Voltage Swing (IN, /IN)
Differential Input Voltage Swing
|IN – /IN|
Output Reference Voltage
see Figure 1a.
see Figure 1b.
No load, max. V
CC
.
Condition
Min
2.375
3.0
47
45
90
1.2
0
0.1
0.2
V
CC
–1.525 V
CC
–1.425 V
CC
–1.325
50
100
Typ
Max
2.625
3.6
70
55
110
V
IH
–0.1
1.7
V
CC
Units
V
mA
½
½
V
V
V
V
V
R
IN
R
DIFF-IN
V
IH
V
IL
V
IN
V
DIFF_IN
V
REF–AC
LVTTL/LVCMOS INPUT DC ELECTRICAL CHARACTERISTICS
V
CC
= 2.375V to 3.60V; V
EE
= 0V; T
A
= –40°C to +85°C
Symbol
V
IL
I
IH
I
IL
V
IH
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
20
Units
V
V
µA
µA
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 ratlng 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 stil-air number, unless otherrwise stated.
4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
M9999-072210
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge®
SY89831U
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS
(6)
V
CC
= +2.5V ±5% or +3.3V ±10%; R
L
= 50½ to V
CC
–2V; T
A
= –40°C to +85°C unless otherwise stated.
Symbol
V
OH
V
OL
V
OUT
V
DIFF_OUT
Parameter
Condition
Output HIGH Voltage
(Q, /Q)
Output LOW Voltage
(Q, /Q)
Output Voltage Swing
(Q, /Q)
Differential Output Voltage Swing
(Q, /Q)
See Figure 1a.
See Figure 1b.
Min
Typ
Max
V
CC
–0.895
V
CC
–1.695
800
1600
Units
V
V
mV
mV
V
CC
–1.145
V
CC
–1.945
550
1100
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS
(6)
V
CC
= +2.5V ±5% or +3.3V ±10%; T
A
= –40°C to +85°C unless otherwise stated.
Symbol
V
IL
I
IH
I
IL
V
IH
Parameter
Condition
Input HIGH Voltage
Input LOW Voltage
Input HIGH Voltage
Input LOW Voltage
–125
–300
Min
2.0
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.
M9999-072210
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precision Edge®
SY89831U
AC ELECTRICAL CHARACTERISTICS
(7)
V
CC
= +2.5V ±5% or +3.3V ±10%; R
L
= 50½ to V
CC
–2V; T
A
= –40°C to +85°C unless otherwise stated.
Symbol
f
MAX
t
pd
Parameter
Condition
Maximum Frequency
Propagation Delay
Within-Device Skew
Part-to-Part Skew
Set-Up Time
Hold Time
RMS Phase Jitter
Output Rise/Fall Times
(20% to 80%)
EN to IN, /IN
EN to IN, /IN
IN-to-Q
IN-to-Q
V
OUT
ž 450mV
Min
2.0
250
Typ
2.5
390
350
5
300
300
62
70
150
225
Max
450
20
150
Units
GHz
ps
ps
ps
ps
ps
ps
fs
ps
V
IN
ž 100mV
Note 8
t
SKEW
t
S
V
IN
ž 800mV
Note 9
Note 10
Note 10
Output = 622MHz
Integration Range 12kHz - 20MHz
At full output swing.
t
H
t
JITTER
t
r
, t
f
Notes:
7.
8.
9.
High-frequency AC parameters are guaranteed by design and characterization.
Within device skew is measured between two different outputs under identical input transitions.
Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective
inputs.
10. Set-up and hold times apply to synchronous applications that intend to enable/disable before the next clock cycle. For asynchronous applications,
set-up and hold times do not apply.
PHASE NOISE
M9999-072210
hbwhelp@micrel.com or (408) 955-1690
5
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