SY88403BL
3.3V 4.25Gbps CML Low-Power Limiting
Post Amplifier with TTL LOS
MLF and
Micro
LeadFrame are trademarks of Amkor Technology, 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
October 2005
M9999-101105-B
hbwhelp@micrel.com
or (408) 955-1690
General Description
The SY88403BL is a low-power limiting post amplifier
optimized for copper applications. The device
connects to typical transimpedance amplifiers (TIAs).
The linear signal output from TIAs can contain
significant amounts of noise and may vary in
amplitude over time. The SY88403BL quantizes these
signals and outputs typically 800mV
PP
voltage-limited
waveforms.
The SY88403BL operates from a single +3.3V 10%
power supply, over an industrial temperature range of
40C to +85C. With its wide bandwidth and high
gain, signals with data rates up to 4.25Gbps and as
small as 20mV
PP
can be amplified to drive devices
with CML inputs or AC-coupled PECL inputs.
The SY88403BL incorporates a loss-of-signal (LOS)
open-collector TTL output with internal 4.75k pull-up
resistor. A programmable loss-of-signal level set pin
(LOSLVL) sets the sensitivity of the input amplitude
detection. LOS asserts high if the input amplitude falls
below the threshold set by LOSLVL and de-asserts
low otherwise. LOS can be fed back to the enable bar
(/EN) input to maintain output stability under a loss of
signal condition. /EN de-asserts the true output signal
without removing the input signal. Typically 3.5dB
LOS hysteresis is provided to prevent chattering.
All support documentation can be found on Micrel's
web site at: www.micrel.com.
Typical Performance
Features
Multi-rate up to 4.25Gbps operation
20mV
PP
input sensitivity
Low noise 50 CML data outputs
800mV
pp
output swing
60ps edge rates
1ps
RMS
typ. random jitter
10ps
PP
typ. deterministic jitter
Chatter-free Loss-of-Signal (LOS) output
3.5dB electrical hysteresis
OC-TTL output with internal 4.75k pull-up
resistor
Programmable LOS sensitivity using single
external resistor
Internal 50 data input termination
TTL /EN input allows feedback from LOS
Wide operating range:
Single 3.3V 10% power supply
Industrial temperature range: 40C to +85C
Available in a 10-pin EPAD-MSOP and 16-pin
MLFTM package
Applications
1.062Gbps, 2.125Gbps and 4.25Gbps Fibre
Channel
Cable driver
Small form factor (SFF) and small form factor
pluggable (SFP) transceivers
High-gain line driver and line receiver
Markets
Copper interconnect
Datacom and telecom
Storage area network (SAN)
Micrel, Inc.
SY88403BL
October 2005
2
M9999-101105-B
hbwhelp@micrel.com
or (408) 955-1690
Typical Application
Functional Block Diagram
Micrel, Inc.
SY88403BL
October 2005
3
M9999-101105-B
hbwhelp@micrel.com
or (408) 955-1690
Ordering Information
(1)
Part Number
Package
Type
Operating
Range
Package
Marking
Lead
Finish
SY88403BLEY K10-2
Industrial
SY88403BL with
Pb-Free bar-line indicator
Matte-Sn
SY88403BLEYTR
(2)
K10-2 Industrial
SY88403BL with
Pb-Free bar-line indicator
Matte-Sn
SY88403BLMG MLF-16
Industrial
SY88403BL with
Pb-Free bar-line indicator
NiPdAu
Pb-Free
SY88403BLMGTR
(2)
MLF-16 Industrial
SY88403BL with
Pb-Free bar-line indicator
NiPdAu
Pb-Free
Note:
1.
Contact factory for die availability. Dice are guaranteed at T
A
= 25C, DC Electricals only.
2. Tape
and
Reel.
Pin Configuration
10-Pin EPAD-MSOP (K10-2)
16-Pin MLFTM (MLF-16)
Micrel, Inc.
SY88403BL
October 2005
4
M9999-101105-B
hbwhelp@micrel.com
or (408) 955-1690
Pin Description
MLFTM
Pin Number
EPAD-MSOP
Pin Number
Pin
Name
Type Pin
Function
1, 4
2, 3
DIN, /DIN
Differential
data input
Differential data input. Each pin internally terminates to REF
through 50.
2, 3, 10, 11
Exposed Pad
6
Exposed Pad
GND Ground
Device ground. Exposed pad must be soldered (or equivalent)
to the same potential as the ground pins.
5, 8, 13, 16
10
VCC
Power
supply
Positive power supply. Bypass with 0.1F||0.01F low ESR
capacitors. 0.01F capacitors should be as close as possible to
VCC pin.
6 4
VREF
Reference Voltage. Bypass with 0.01F low ESR capacitor from
V
REF
to V
CC
to stabilize LOS
LVL
and V
REF
.
7 7
LOS
Open
Collector TTL
output with
internal
4.75k pull-
up resistor
Loss-of-Signal: Asserts high when the data input amplitude falls
below the threshold set by LOSLVL.
9, 12
9, 8
DOUT,
/DOUT
Differential
CML output
Differential data output.
14 5
LOSLVL
Input: Default
is maximum
sensitivity.
Loss-of-Signal level set: A resistor from this pin to VCC sets the
threshold for the data input amplitude at which the LOS output
will be asserted.
15 1
/EN
TTL input:
Default is
high.
Enable bar: De-asserts true data output when high. Incorporates
25k pull-up to V
CC
.
Micrel, Inc.
SY88403BL
October 2005
5
M9999-101105-B
hbwhelp@micrel.com
or (408) 955-1690
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) ............................... 0V to +7.0V
/EN, LOSLVL Voltage.................................... 0 to V
CC
REF Current ......................................................1mA
LOS Current ......................................................5mA
DOUT, /DOUT Current ....................................25mA
DIN, /DIN Current ............................................10mA
Lead Temperature (soldering, 20sec.) ............. 260C
Storage Temperature (T
s
) ...............65C to +150C
Operating Ratings
(2)
Supply Voltage (V
CC
)...........................+3.0V to +3.6V
Ambient Temperature (T
A
)................ 40C to +85C
Junction Temperature (T
A
).............. 40C to +120C
Package Thermal Resistance
(3)
MLFTM
JA
(Still-Air).......................................... 61C/W
JB
........................................................ 38C/W
EPAD-MSOP
JA
(Still-Air).......................................... 38C/W
JB
........................................................ 22C/W
DC Electrical Characteristics
V
CC
= +3.0V to +3.6V; T
A
= 40C to +85C; typical values at V
CC
= +3.3V, T
A
= 25C.
Symbol Parameter
Condition
Min
Typ
Max
Units
I
CC
Power Supply Current
3.3V, Note 4
25
42
mA
3.3V, Note 5
41
62
mA
V
REF
REF
Voltage
V
CC
1.3 V
V
LOSLVL
LOSLVL Voltage Range
V
REF
V
CC
V
V
OH
DOUT, /DOUT HIGH Voltage
Note 6
V
CC
0.020 V
CC
0.005 V
CC
V
V
OL
DOUT, /DOUT LOW Voltage
3.3V, Note 6
V
CC
0.475 V
CC
0.400 V
CC
0.350 V
V
OFFSET
Differential Output Offset
80
mV
Z
O
Single-Ended
Output
Impedance
40
50
60
Z
I
Single-Ended Input Impedance
40
50
60
TTL DC Electrical Characteristics
V
CC
= +3.0V to +3.6V; T
A
= 40C to +85C.
Symbol Parameter
Condition
Min
Typ
Max
Units
V
OH
LOS Output HIGH Level
Sourcing 100A
2.4
V
CC
V
V
OL
LOS Output LOW Level
Sinking 2mA
0.5
V
V
IH
/EN Input HIGH Voltage
2.0
V
V
IL
/EN Input LOW Voltage
0.8
V
I
IH
/EN Input HIGH Current
V
IN
= 2.7V
V
IN
= V
CC
20
100
A
A
I
IL
/EN Input LOW Current
V
IN
= 0.5V
0.3
mA
Notes:
1. Permanent device damage may occur if ratings in the absolute maximum ratings section are exceeded. This is a stress rating only and
functional operation is not implied for 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. Thermal performance assumes are of 4-layer PCB. Exposed pad must be soldered (or equivalent) to the device's most negative potential on
the PCB.
4. Excludes current of CML output stage. See "Detailed Description."
5. Total device current with no output load.
6. Output levels are based on a 50 to V
CC
load impedance. If the load impedance is different, the output level will be changed. Amplifier is in
limiting mode.
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