Micrel, Inc.
3V LVTTL-TO-DIFFERENTIAL
LVPECL AND DIFFERENTIAL
LVPECL-TO-LVTTL TRANSLATOR
Precision Edge
SY89328L
Precision Edge
®
SY89328L
®
FEATURES
s
3.3V
±
10% power supply
s
Guaranteed AC parameters over temperature:
f
MAX
> 275MHz (LVTTL)
s
< 2ns LVPECL-to-LVTTL propagation delay
s
< 600ps LVTTL-to-LVPECL propagation delay
s
Internal 75k
Ω
input pull-up and pull-down resistors
s
Industrial temperature range: –40
°
C to +85
°
C
s
Available in ultra-small 8-pin MLF™ (2mm
×
2mm)
package
Precision Edge
®
DESCRIPTION
The SY89328L is a differential LVPECL-to-LVTTL
translator and an LVTTL-to-differential LVPECL translator
in a single package. Because LVPECL (Positive ECL) levels
are used, only +3.3V and ground are required. The
SY89328L is functionally equivalent to the SY100EPT28L,
but in an ultra-small 8-lead MLF™ package that features a
70% smaller footprint. This ultra-small package and the dual
translation design of the SY89328L make it ideal for
applications that are sending and receiving signals across
a backplane.
BLOCK DIAGRAM
IN_LVPECL
Q_LVTTL
/IN_LVPECL
Q_LVPECL
IN_LVTTL
/Q_LVPECL
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame
and MLF are trademarks of Amkor Technology, Inc.
M9999-072005
hbwhelp@micrel.com or (408) 955-1690
Rev.: B
Amendment: /0
1
Issue Date: July 2005
Micrel, Inc.
Precision Edge
®
SY89328L
PACKAGE/ORDERING INFORMATION
IN_LVPECL
/IN_LVPECL
Q_LVPECL
/Q_LVPECL
1
2
3
4
8
7
6
5
VCC
Q_LVTTL
IN_LVTTL
GND
Ordering Information
Part Number
SY89328LMITR
SY89328LMGTR
Package
Type
MLF-8
MLF-8
Operating
Range
Industrial
Industrial
Package
Marking
HEP28
HEP28 with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Pb-Free
NiPdAu
8-Pin MLF™
Ultra-Small Outline (2mm
×
2mm)
PIN DESCRIPTION
Pin Number
1, 2
`
7
6
3, 4
8
5
Pin Name
IN_LVPECL,
/IN_LVPECL
Q_LVTTL
IN_LVTTL
Q_LVPECL,
/Q_LVPECL
VCC
GND,
Exposed Pad
Type
100k ECL Input
Pin Function
Differential LVPECL Input: Includes internal 75kΩ pull-down resistor on
internal 75kΩ pull-up and pull-down resistors on /IN.
See “Input Interface Applications” section for single-ended inputs.
Single-ended LVTTL Output: Translated from LVPECL input. Q_LVTTL
output will default LOW with IN_LVPECL and /IN_LVPECL inputs left open.
Single-ended LVTTL Input.
Differential LVPECL Output: Translated from LVTTL input. See “Output
Interface Applications” section for recommendations on terminations.
Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors.
GND and exposed pad must be tied to ground plane.
LVTTL Output
LVTTL Input
100k ECL Output
VCC Power
Ground
M9999-072005
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
Precision Edge
®
SY89328L
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
) .................................. –0.5V to +3.8V
Input Voltage (V
IN
) ......................................... –0.5V to V
CC
LVPECL Output Current (I
OUT
)
Continuous ............................................................. 50mA
Surge .................................................................... 100mA
Input Current
Source or sink current on IN, /IN ..........................
±50mA
Lead Temperature (soldering, 20 sec.) ................... +260°C
Storage Temperature (T
S
) ....................... –65°C to +150°C
Note 1.
Operating Ratings
(Note 2)
Supply Voltage (V
CC
) ...................................... 3.0V to 3.6V
Ambient Temperature (T
A
) ......................... –40°C to +85°C
Package Thermal Resistance,
Note 3
MLF™ (θ
JA
)
Still-Air ................................................................. 93°C/W
500lfpm ............................................................... 87°C/W
MLF™ (Ψ
JB
)
Junction-to-Board ................................................ 60°C/W
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.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB.
Note 2.
Note 3.
DC ELECTRICAL CHARACTERISTICS
(Note 4)
Symbol
V
CC
I
CC
Parameter
Power Supply Voltage
Power Supply Current
Max V
CC
, No Load
Condition
Min
3.0
Typ
3.3
22
Max
3.6
40
Units
V
mA
LVPECL DC ELECTRICAL CHARACTERISTICS
(Note 4)
V
CC
= +3.3V±10% and V
EE
= 0V; R
L
= 50Ω to V
CC
–2V; T
A
= –40°C to +85°C, unless otherwise noted.
Symbol
V
OH
V
OL
V
IH
V
IL
V
CMR
I
IH
I
IL
Parameter
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
LVPECL Common Mode Range
Input HIGH Current
Input LOW Current
IN
/IN
Note 4.
Condition
Min
Typ
Max
Units
V
V
V
V
V
µA
µA
µA
V
CC
–1.145 V
CC
–1.020 V
CC
–0.895
V
CC
–1.945 V
CC
–1.820 V
CC
–1.695
V
CC
–1.225
V
CC
–1.945
1.2
V
IN
= 3.46V
0.5
–300
V
CC
–0.880
V
CC
–1.625
V
CC
150
The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
M9999-072005
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge
®
SY89328L
LVTTL DC ELECTRICAL CHARACTERISTICS
(Note 5)
V
CC
= +3.3V±10%; C
L
= 20pF, T
A
= –40°C to +85°C, unless otherwise noted.
Symbol
V
OH
V
OL
V
IH
V
IL
V
IK
I
IH
I
IL
I
OUT(SC)
Parameter
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Input Clamp Voltage
Input HIGH Current
I
IK
= –18mA
V
IN
= 2.7V
V
IN
= V
CC
Input LOW Current
LVTTL Output
Short-Circuit Current
V
IN
= 0.5V
V
OUT
= 0V
Condition
I
OH
= –3mA
I
OH
= –24mA
Min
2.0
—
2.0
—
—
—
—
—
–275
Typ
—
—
—
—
—
—
—
—
—
Max
—
0.5
—
0.8
–1.2
20
100
–0.2
–80
Units
V
V
V
V
V
µA
µA
µA
mA
AC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V±10%. T
A
= –40°C to +85°C, unless otherwise noted.
Symbol
f
MAX
t
pd
Parameter
Maximum Frequency
LVPECL
LVTTL
Propagation Delay
IN_LVPECL-to-Q_LVTTL
IN_LVTTL-to-Q_LVPECL
V
PP
t
DC
t
Jitter
t
r
, t
f
LVPECL Input Voltage Swing
(Single-Ended)
Duty Cycle
Cycle-toCycle Jitter
Total Jitter
LVPECL Output Rise/Fall Times
(20% to 80%)
LVTTL Output Rise/Fall Times
(10% to 90%)
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Condition
Note 6
Note 7
Note 7
Note 6
Note 8
Min
700
275
1.5
100
100
45
Typ
—
350
—
400
—
50
Max
—
—
2.5
600
—
55
<1
20
Units
MHz
MHz
ns
ps
mV
%
ps
RMS
ps
PP
ns
ns
Note 9
Note 10
At full output swing,
Note 5
At full output swing,
Note 6
200
0.5
—
—
500
1.0
The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
R
L
= 50Ω to V
CC
–2V
C
L
= 20pF
V
PP
(min) is the minimum input swing for which AC parameters are guaranteed.
Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, T
n
– T
n–1
,where T is the time between rising edges of the
output signal.
Note 10.
Total jitter definition: with an ideal clock input of frequency
≤
f
MAX
, no more than one output edge in 10
12
output edge will deviate by more than
the specified peak-to-peak jitter value.
M9999-072005
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precision Edge
®
SY89328L
LVPECL INPUT INTERFACE APPLICATIONS
+3.3V
1kΩ
IN
+3.3V
V
CC
—1.3V
1.6kΩ
Figure 1. Single-Ended Input
(Terminating unused input)
LVPECL OUTPUT INTERFACE APPLICATIONS
+3.3V
+3.3V
130Ω
Z
O
= 50Ω
Z
O
= 50Ω
V
CC
—2V82Ω
130Ω
+3.3V
+3.3V
Z
O
= 50Ω
Z
O
= 50Ω
50Ω
50Ω
50Ω
+3.3V
82Ω
V
CC
—2V
C (Optional)
0.01µF
Figure 2a. Parallel Thevenin-Equivalent
Termination
Figure 2b. Three Resistor
“Y Termination”
+3.3V
+3.3V
+3.3V
130Ω
130Ω
Z
O
= 50Ω
V
CC
—2V
82Ω
82Ω
1kΩ
+3.3V
1.6kΩ
V
CC
—1.3V
Figure 2c. Terminating Unused I/O
M9999-072005
hbwhelp@micrel.com or (408) 955-1690
5
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