NOT RECOMMENDED FOR NEW DESIGNS
Micrel, Inc.
3V LVTTL-TO-DIFFERENTIAL LVPECL
AND DIFFERENTIAL LVPECL-TO-LVTTL
TRANSLATOR
ECL Pro™
SY10EPT28L
ECL Pro™
SY100EPT28L
SY10EPT28L
SY100EPT28L
FEATURES
■
3.3V
±
10% power supply
■
Guaranteed AC parameters over temperature:
f
MAX
> 275MHz (LVTTL)
■
< 2ns LVPECL-to-LVTTL propagation delay
■
< 600ps LVTTL-to-LVPECL propagation delay
■
Internal 75k
Ω
input pull-down resistors
■
Industrial temperature range: –40
°
C to +85
°
C
■
Available in 8-pin MSOP and SOIC packages
ECL Pro™
DESCRIPTION
The SY10/100EPT28L is a differential LVPECL-to-
LVTTL translator and a LVTTL-to-differential LVPECL
translator in a single package. Because LVPECL (Positive
ECL) levels are used, only +3.3V and ground are required.
The small outline 8-pin package and the dual translation
design of the EPT28L makes it ideal for applications
which are sending and receiving signals across a
backplane.
The 100k series includes temperature compensation.
Thus, logic levels are constant over temperature.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
PIN NAMES
Pin
D_LVTTL
Q_LVTTL
D_LVPECL
/D_LVPECL
Q_LVPECL
/Q_LVPECL
V
CC
GND
Function
Low Voltage TTL Input
Low Voltage TTL Output
Low Voltage Differential PECL Inputs
with 75kΩ internal pull-down
Low Voltage Differential PECL Outputs
3.3V Positive Supply
Ground
ECL Pro is a trademark of Micrel, Inc.
M9999-111605
hbwhelp@micrel.com or (408) 955-1690
Rev.: C
Amendment: /0
1
Issue Date: November 2005
Micrel, Inc.
ECL Pro™
SY10EPT28L
SY100EPT28L
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
D_LVPECL 1
/D_LVPECL 2
LVPECL
LVTTL
8 VCC
7 Q_LVTTL
6 D_LVTTL
5 GND
Part Number
SY10EPT28LZI
SY10EPT28LZITR
(2)
SY100EPT28LZI
SY100EPT28LZITR
(2)
SY10EPT28LKI
SY10EPT28LKITR
(2)
SY100EPT28LKI
SY100EPT28LKITR
(2)
SY10EPT28LZG
(3)
SY10EPT28LZGTR
(2, 3)
SY100EPT28LZG
(3)
SY100EPT28LZGTR
(2, 3)
SY10EPT28LKG
(3)
SY10EPT28LKGTR
(2, 3)
SY100EPT28LKG
(3)
SY100EPT28LKGTR
(2, 3)
Package
Type
Z8-1
Z8-1
Z8-1
Z8-1
K8-1
K8-1
K8-1
K8-1
Z8-1
Z8-1
Z8-1
Z8-1
K8-1
K8-1
K8-1
K8-1
Operating
Range
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Package
Marking
HEP28
HEP28
XEP28
XEP28
HP28
HP28
XP28
XP28
Lead
Finish
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Q_LVPECL 3
/Q-LVPECL 4
TOP VIEW
(Available in MSOP
or SOIC package)
HEP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
HEP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
XEP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
XEP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
HP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
HP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
XP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
XP28 with
NiPdAu
Pb-Free bar-line indicator Pb-Free
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.
M9999-111605
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
ECL Pro™
SY10EPT28L
SY100EPT28L
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
IN
I
OUT
T
A
T
LEAD
T
store
θ
JA
Power Supply Voltage
Input Voltage
LVPECL Output Current
Operating Temperature Range
Lead Temperature (Soldering, 20sec.)
Storage Temperature Range
Package Thermal Resistance
(Junction-to-Ambient)
–Still-Air (SOIC)
–500lfpm (SOIC)
–Still-Air (MSOP)
–500lfpm (MSOP)
θ
JC
Package Thermal Resistance
(Junction-to-Case)
(SOIC)
(MSOP)
–Continuous
–Surge
Rating
Value
–0.5 to +3.8
0 to V
CC
50
100
–40 to +85
+260
–65 to +150
160
109
206
155
39
39
Unit
V
V
mV
°C
°C
°C
°C/W
°C/W
°C/W
DC ELECTRICAL CHARACTERISTICS
(2)
T
A
= –40
°
C
Symbol
V
CC
I
CC
Parameter
Power Supply Voltage
Power Supply Current
Min.
3.0
—
Typ.
3.3
20
Max.
3.6
40
Min.
3.0
—
T
A
= +25
°
C
Typ.
3.3
22
Max.
3.6
40
Min.
3.0
—
T
A
= +85
°
C
Typ.
3.3
25
Max.
3.6
40
Unit
V
mA
Condition
LVPECL DC ELECTRICAL CHARACTERISTICS
(2)
V
CC
= 3.3V
±10%
T
A
= –40
°
C
Symbol
V
OH
V
OL
V
IH
V
IL
I
IH
I
IL
C
IN
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.
10/100KEPT circuits are designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established. The
circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained.
Input and output parameters vary 1:1 with V
CC
.
T
A
= +25
°
C
Max.
2415
2405
1615
1605
2415
2420
1690
1675
150
0.5
—
—
Min.
2230
2155
1430
1355
2155
2075
1430
1355
—
—
—
—
Typ.
2355
2280
1555
1480
—
—
—
—
—
—
0.75
1.1
Max.
2480
2405
1680
1605
2480
2420
1755
1675
150
0.5
—
—
Min.
2290
2155
1490
1355
2215
2075
1490
1355
—
—
—
—
T
A
= +85
°
C
Typ.
2415
2280
1615
1480
—
—
—
—
—
—
—
—
Max.
2540
2405
1740
1605
2540
2420
1815
1675
150
0.5
—
—
Unit
mV
mV
mV
mV
µA
µA
pF
pF
Condition
Note 3
Note 3
Note 3
Note 3
V
IN
= 3.46V
Parameter
Output HIGH
Voltage
Output LOW
Voltage
Input HIGH
Voltage
Input LOW
Voltage
Input HIGH Current
Input LOW Current
Input Capacitance
/D, D
(SOIC)
(MSOP)
10EPT
100EPT
10EPT
100EPT
10EPT
100EPT
10EPT
100EPT
Min.
2165
2155
1365
1355
2090
2075
1365
1355
—
0.5
—
—
Typ.
2290
2280
1490
1480
—
—
—
—
—
—
—
—
2.
3.
M9999-111605
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
ECL Pro™
SY10EPT28L
SY100EPT28L
LVTTL DC ELECTRICAL CHARACTERISTICS
(4)
V
CC
= 3.3V
±10%
T
A
= –40
°
C
Symbol
V
OH
V
OL
V
IH
V
IL
V
IK
I
IH
I
IL
I
OUT(SC)
C
IN
Parameter
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Input Clamp Voltage
Input HIGH Current
Min.
2.0
—
2.0
—
—
—
—
Input LOW Current
LVTTL Output
Short-Circuit Current
Input Capacitance
(SOIC)
(MSOP)
—
–275
—
—
Typ.
—
—
—
—
—
—
—
—
—
Max.
—
0.5
—
0.8
–1.2
20
100
–0.2
–80
—
—
Min.
2.0
—
2.0
—
—
—
—
—
–275
—
—
T
A
= +25
°
C
Typ.
—
—
—
—
—
—
—
—
—
0.75
1.1
Max.
—
0.5
—
0.8
–1.2
20
100
–0.2
–80
—
—
Min.
2.0
—
2.0
—
—
—
—
—
–275
—
—
T
A
= +85
°
C
Typ.
—
—
—
—
—
—
—
—
—
Max.
—
0.5
—
0.8
–1.2
20
100
–0.2
–80
—
—
Unit
V
V
V
V
V
µA
µA
µA
mA
pF
pF
I
IK
= –18mA
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
V
OUT
= 0V
Condition
I
OH
= –3mA
I
OH
= –24mA
AC ELECTRICAL CHARACTERISTICS
(4)
V
CC
= +3.3V
±10%
T
A
= –40
°
C
Symbol
f
MAX
Parameter
Maximum Frequency
LVPECL
LVTTL
Propagation Delay
D_LVPECL
➝
Q_LVTTL
Q_LVTTL
➝
D_LVPECL
V
CMR
V
PP
LVPECL
Common Mode Range
LVPECL Input Voltage Swing
(Single-Ended)
LVPECL Output Rise/Fall Times
(20% to 80%)
LVTTL Output Rise/Fall Times
(10% to 90%)
Duty Cycle
Cycle-to-Cycle Jitter (rms)
Min.
700
275
1.5
100
1.2
Typ.
—
350
—
400
—
Max.
—
—
2.5
600
V
CC
—
500
1.0
55
<1
Min.
700
275
1.5
100
1.2
T
A
= +25
°
C
Typ.
—
350
—
400
—
Max.
—
—
2.5
600
V
CC
—
500
1.0
55
<1
Min.
700
275
1.5
100
1.2
T
A
= +85
°
C
Typ.
—
350
—
400
—
Max.
—
—
2.5
600
V
CC
—
500
1.0
55
<1
Unit
MHz
MHz
ns
ps
V
Condition
Output
Toggle
Frequency
C
L
= 20pF
50Ω to V
CC
–2.0
t
PLH
t
PHL
100
200
0.5
45
—
—
—
—
50
0.2
100
200
0.5
45
—
—
—
—
50
0.2
100
200
0.5
45
—
—
—
—
50
0.2
mV
ns
ns
%
ps
Note 5
50Ω to V
CC
–2.0
t
r
, t
f
C
L
= 20pF
t
DC
t
JITTER
RMS
4.
10/100KEPT circuits are designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established. The
circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained.
5.
V
PP
(min) is the minimum input swing for which AC parameters are guaranteed.
M9999-111605
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
ECL Pro™
SY10EPT28L
SY100EPT28L
TERMINATION RECOMMENDATIONS
+3.3V
+3.3V
Z
O
= 50Ω
Z
O
= 50Ω
R1
130Ω
R1
130Ω
+3.3V
R2
82Ω
R2
82Ω
V
t
= V
CC
—2V
Figure 1. LVPECL Parallel Termination–Thevenin Equivalent
+3.3V
Z = 50Ω
Z = 50Ω
50Ω
50Ω
+3.3V
source
R
b
destination
Figure 2. LVPECL Three-Resistor “Y–Termination”
Notes:
1.
2.
3.
Power-saving alternative to 4-resistor, Thevenin termination.
Place termination resistors as close to destination inputs as possible.
R
b
resistor sets the DC bias voltage, equal to V
t
. For 3.3V supply, R
b
value is between 46Ω to 50Ω.
M9999-111605
hbwhelp@micrel.com or (408) 955-1690
5
stm32/stm8
