1
Precision Edge®
SY89311U
Micrel, Inc.
M9999-092606
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■2.5V, 3.3V and 5V power supply
■Guaranteed AC parameters over temperature:
•f
MAX > 3.0GHz
•<20ps output-to-output skew
•<200ps tr/t
f
•<300ps propagation delay
■100K compatible I/O
■Wide temperature range: –40°C to +85°C
■Available in ultra-small 8-pin MLF®
(2mm ××
××
× 2mm) package
FEATURES
Precision Edge®
SY89311U
Rev.: D Amendment: /0
Issue Date: September 2006
The SY89311U is a precision, high-speed 1:2 differential
fanout buffer. Having within-device skews and output
transition times significantly improved over the EL11V, the
SY89311U is ideally suited for those applications which
require the ultimate in AC performance in a small package.
The differential inputs of the SY89311U employ clamping
circuitry to maintain stability under open input conditions. If
the inputs are left open, the Q outputs will be LOW.
The differential inputs can accept 10/100K ECL/PECL
signals (external termination required) and the outputs are
100K ECL/PECL compatible.
Precision Edge®
Precision Edge is a registered trademark of Micrel, Inc.
Micro
LeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
2.5V/3.3V/5V 1:2 DIFFERENTIAL
PECL/LVPECL/ECL FANOUT BUFFER
BLOCK DIAGRAM
Q0
/Q0
Q1
/Q1
IN
/IN PECLPECL
2
Precision Edge®
SY89311U
Micrel, Inc.
M9999-092606
hbwhelp@micrel.com or (408) 955-1690
PIN DESCRIPTION
Pin Number Pin Name Type Pin Function
1, 2, 3, 4 Q0, /Q0, 100K Output Differential PECL/ECL Outputs: Default to LOW if IN inputs are left open.
Q1, /Q1 See“Output Interface Applications” section for recommendations on
terminations. Unused output pairs may be left floating without any inpact on
skew or jitter.
5VEE, Negative Negative Power Supply: VEE and exposed pad must be tied to most negative
Exposed Pad Power Supply supply. For PECL/LVPECL connect to ground.
6 /IN 100K Input Differential PECL/ECL Input: Internal 75kΩ pull-up and pull-down resistors.
If left floating, pin defaults to VCC/2. When not used, this input can be left
open. See “Input Interface Applications” section for single-ended inputs.
7IN100K Input Differential PECL/ECL Input: Internal 75kΩ pull-down resistor. If left open,
pin defaults LOW. Q output will be LOW. Accepts differential 10K and 100K
ECL/PECL. See “Input Interface Applications” section for single-ended inputs.
8VCC Positive Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors.
Power Supply
PACKAGE/ORDERING INFORMATION
Q0
/Q0
Q1
/Q1
VCC
IN
/IN
VEE
1
2
3
4
8
7
6
5
8-Pin MLF®
Ultra-Small Outline (2mm ××
××
× 2mm)
Ordering Information
Package Operating Package Lead
Part Number Type Range Marking Finish
SY89311UMITR MLF-8 Industrial 311 Sn-Pb
SY89311UMGTR(1) MLF-8 Industrial 311 with Pb-Free
Pb-Free bar-line indicator NiPdAu
Note:
1. Pb-Free package is recommended for new designs.
3
Precision Edge®
SY89311U
Micrel, Inc.
M9999-092606
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(1)
Supply Voltage (VCC).................................. –0.5V to +6.0V
Input Voltage (VIN)......................................... –0.5V to VCC
LVPECL Output Current (IOUT)
Continuous ............................................................. 50mA
Surge .................................................................... 100mA
Input Current
Source or sink current on IN, /IN .......................... ±50mA
Lead Temperature (soldering, 20 sec.) ................... +260°C
Storage Temperature (TS) ....................... –65°C to +150°C
Operating Ratings(2)
Supply Voltage |VCC–VEE|.................. +2.375V to +2.625V
............................................................ +3.0V to +3.6V
............................................................ +4.5V to +5.5V
Ambient Temperature (TA) ......................... –40°C to +85°C
Package Thermal Resistance, Note 3
MLF™ (θJA)
Still-Air ................................................................. 93°C/W
500lfpm ............................................................... 87°C/W
MLF™ (ΨJB)
Junction-to-Board ................................................ 60°C/W
Symbol Parameter Condition Min Typ Max Units
VCC Power Supply Voltage LVPECL 2.375 2.5 2.625 V
LVPECL 3.0 3.3 3.6 V
PECL 4.5 5.0 5.5 V
ECL –5.5 –5.0 –4.5 V
LVECL –3.6 –3.3 –3.0 V
LVECL –2.625 –2.5 –2.375 V
IEE Power Supply Current Max. VCC, no load 30 44 mA
IIH Input HIGH Current VIN = VIH 150 µA
IIL Input LOW Current IN VIN = VIL 0.5 µA
/IN VIN = VIL –150 µA
CIN Input Capacitance 1.0 pF
DC ELECTRICAL CHARACTERISTICS(4)
TA = –40°C to +85°C
VCC = +2.5V ±5% or +3.3V ±10% or +5.0V ±10% and VEE = 0V; VCC = 0V and VEE = –2.5V ±5% or –3.3V ±10% or –5.0V ±10%;
RL = 50Ω to VCC–2V; TA = –40°C to +85°C, unless otherwise noted.
Symbol Parameter Condition Min Typ Max Units
VOH Output HIGH Voltage VCC–1.145 VCC–0.895 V
VOL Output LOW Voltage VCC–1.945 VCC–1.695 V
VIH Input HIGH Voltage VCC–1.225 VCC–0.88 V
VIL Input LOW Voltage VCC–1.945 VCC–1.625 V
VIHCMR Input HIGH Voltage Common Note 5 VEE+1.2 VCC V
Mode Range
IIH Input HIGH Current VIN = VIH 150 µA
IIL Input LOW Current (IN) VIN = VIL 0.5 µA
Input LOW Current (/IN) VIN = VIL –150 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 values assume exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB.
4. This circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
5. VIHCMR (min) varies 1:1 with VEE, (max) varies 1:1 with VCC.
(100K) ECL/LVECL DC ELECTRICAL CHARACTERISTICS
4
Precision Edge®
SY89311U
Micrel, Inc.
M9999-092606
hbwhelp@micrel.com or (408) 955-1690
INPUT WAVEFORM
IN V
IHCMR
/IN
V
DIFF
= 150mV to 1200mV
VCC = +2.5V ±5% or +3.3V ±10% or +5.0V ±10% and VEE = 0V; VCC = 0V and VEE = –2.5V ±5% or –3.3V ±10% or or –5.0V ±10%;
RL = 50Ω to VCC–2V; TA = –40°C to +85°C, unless otherwise noted.
Symbol Parameter Condition Min Typ Max Units
fMAX Maximum Toggle Frequency 3 GHz
tpd Propagation Delay (Differential)
IN to Q, /Q VCC = 3.3V/5V 140 220 300 ps
IN to Q, /Q VCC = 2.5V 170 240 360 ps
tSKEW Within-Device Skew Q, /Q Note 7 520ps
Part-to-Part Skew VCC = 3.3V/5V, Note 7 150 ps
VCC = 2.5V, Note 7 120 ps
tJITTER Cycle-to-Cycle Jitter (rms) 1ps
(rms)
VDIFF Input Swing Note 8 150 800 1200 mV
tr, tfOutput Rise/Fall Time (20% to 80%) 70 120 200 ps
Notes:
6. Measured with 750mV input signal, 50% duty cycle. VDIFF_OUT is ≥400mV.
7. Skew is measured between outputs under identical transitions. Duty cycle skew is defined only for differential operation when the delays are
measured from the cross point of the inputs to the cross point of the outputs.
8. See “Input Waveform.”
AC ELECTRICAL CHARACTERISTICS(6)
5
Precision Edge®
SY89311U
Micrel, Inc.
M9999-092606
hbwhelp@micrel.com or (408) 955-1690
INPUT INTERFACE APPLICATIONS
IN
VCC
VCC –1.3V
V
CC
= 2.5V; R1 = 1kΩ, R2 = 900Ω
V
CC
= 3.3V; R1 = 1kΩ, R2 = 1.6kΩ
V
CC
= 5V; R1 = 1kΩ, R2 = 2.8kΩ
VCC
R1
R2
Figure 1. Single-Ended Input
(Terminating unused input)
LVPECL OUTPUT INTERFACE APPLICATIONS
Z
O
= 50Ω
R2
R1 R1
R2
R3
R4
V
CC
–2V
V
CC
–1.3V
V
CC
V
CC
V
CC
V
CC
V
CC
= 2.5V; R1 = 250Ω, R2 = 62.5Ω, R3 = 1kΩ, R4 = 900Ω,
V
CC
= 3.3V; R1 = 130Ω, R2 = 82Ω, R3 = 1kΩ, R4 = 1.6kΩ,
V
CC
= 5V; R1 = 83Ω, R2 = 125Ω, R3 = 1kΩ, R4 = 2.8kΩ,
Figure 2c. Terminating Unused I/O
R2R2
ZO = 50Ω
ZO = 50Ω
R1 R1
VCC –2V
VCC VCC
VCC
VCC = 2.5V; R1 = 250Ω, R2 = 62.5Ω
VCC = 3.3V; R1 = 130Ω, R2 = 82Ω
VCC = 5V; R1 = 83Ω, R2 = 125Ω
Figure 2a. Parallel Thevenin-Equivalent
Termination
ZO = 50Ω
ZO = 50Ω
Rpd
50Ω50Ω
C (Optional)
0.01µF
VCC VCC
VCC = 2.5V; Rpd = 39Ω
VCC = 3.3V; Rpd = 50Ω
VCC = 5V; Rpd = 100Ω
Figure 2b. Three Resistor
“Y Termination”
6
Precision Edge®
SY89311U
Micrel, Inc.
M9999-092606
hbwhelp@micrel.com or (408) 955-1690
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
8 LEAD ULTRA-SMALL EPAD-MicroLeadFrame® (MLF-8)
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
VEE
VEE
Heat Dissipation
PCB Thermal Consideration for 8-Pin MLF® Package
Package Notes:
1. Package meets Level 2 qualification.
2. All parts are dry-packaged before shipment.
3. Exposed pads must be soldered to a ground for proper thermal management.
