translator and a TTL-to-differential PECL translator in a
single package. Because PECL (Positive ECL) levels are
used, only +5V and ground are required. The small outline
8-pin package and the dual translation design of the
ELT28 makes it ideal for applications which are sending
and receiving signals across a backplane.
PIN CONFIGURATION/BLOCK DIAGRAM
PIN NAMES
Pin
Function
TTL Inputs
TTL Outputs
PECL Differential Inputs
PECL Differential Outputs
Positive Supply
Ground
DECL 1
/DECL 2
PECL
TTL
8 VCC
7 QTTL
6 DTTL
5 GND
DTTL
QTTL
DECL, /DECL
QECL, /QECL
V
CC
GND
QECL 3
/QECL 4
TOP VIEW
(Available in MSOP or SOIC package)
Rev.: B
Amendment: /0
1
Issue Date: February 2003
Micrel
SY10ELT28
SY100ELT28
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
IN
I
OUT
T
A
T
store
θ
JA
Power Supply Voltage
Input Voltage
PECL Output Current
Operating Temperature Range
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 +7.0
0 to +6.0
50
100
–40 to +85
–65 to +150
160
109
206
155
39
39
Unit
V
V
mA
°C
°C
°C/W
°C/W
°C/W
NOTE:
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.
DC ELECTRICAL CHARACTERISTICS
(1)
V
CC
= +5V
±10%;
V
EE
= 0V
T
A
= –40
°
C
Symbol
V
CC
I
CC
C
IN
Parameter
Power Supply Voltage
Power Supply Current
Input Capacitance
(SOIC)
(MSOP)
Min.
4.75
—
—
—
Typ.
5.0
23
—
—
Max.
5.5
40
—
—
Min.
4.75
—
—
—
T
A
= +25
°
C
Typ.
5.0
22
0.75
1.1
Max.
5.5
40
—
—
Min.
4.75
—
—
—
T
A
= +85
°
C
Typ.
5.0
25
—
—
Max.
5.5
40
—
—
Unit
V
mA
pF
pF
Condition
NOTE:
1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table 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
. V
CC
can vary
±0.25V.
10K PECL DC ELECTRICAL CHARACTERISTICS
(1)
V
CC
= +5.0V
±10%
T
A
= –40
°
C
Symbol
V
OH
V
OL
V
IH
V
IL
V
IHCMR
Parameter
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
(Single-Ended)
Input LOW Voltage
(Single-Ended)
Input HIGH Voltage
Common Mode Range
(2)
Min.
3920
3050
3770
3050
Typ.
4010
3200
—
—
Max.
4110
3350
4110
3500
Min.
4020
3050
3870
3050
T
A
= +25
°
C
Typ.
4105
3210
—
—
Max.
4190
3370
4190
3520
Min.
4090
3050
3940
3050
T
A
= +85
°
C
Typ.
4185
3227
—
—
Max.
4280
3405
4280
3555
Unit
mV
mV
mV
mV
Condition
50Ω V
CC
–2V
50Ω V
CC
–2V
1.2
—
V
CC
1.2
—
V
CC
1.2
—
V
CC
mV
NOTES:
1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table 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.
2. V
IHCMR
(Min) varies 1:1 with GND, V
IHCMR
(Max) varies 1:1 with V
CC
.
2
Micrel
SY10ELT28
SY100ELT28
100K PECL DC ELECTRICAL CHARACTERISTICS
(1)
V
CC
= +5.0V
±10%
T
A
= –40
°
C
Symbol
V
OH
V
OL
V
IH
V
IL
V
IHCMR
Parameter
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
(Single-Ended)
Input LOW Voltage
(Single-Ended)
Input HIGH Voltage
Common Mode Range
(2)
Min.
3915
3170
3835
3190
2.2
Typ.
3995
3305
—
—
—
Max.
4120
3445
4120
3525
V
CC
Min.
3975
3190
3835
3190
2.2
T
A
= +25
°
C
Typ.
4045
3295
—
—
—
Max.
4120
3380
4120
3525
V
CC
Min.
3975
3190
3835
3190
2.2
T
A
= +85
°
C
Typ.
4050
3295
—
—
—
Max.
4120
3380
4120
3525
V
CC
Unit
mV
mV
mV
mV
V
Condition
50Ω V
CC
–2V
50Ω V
CC
–2V
NOTES:
1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table 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.
2. V
IHCMR
(Min) varies 1:1 with GND, V
IHCMR
(Max) varies 1:1 with V
CC
.
TTL DC ELECTRICAL CHARACTERISTICS
(1)
V
CC
= +5.0V
±10%
T
A
= –40
°
C
Symbol
I
IH
I
IL
V
IH
V
IL
V
IK
V
OH
V
OL
I
OSC
Parameter
Input HIGH Current
Input LOW Current
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
Output LOW Voltage
Output Short-Circuit Current
Min.
—
—
—
2.0
—
—
2.4
—
–175
Typ.
10
—
—
—
—
—
2.9
0.29
—
Max.
20
100
–600
—
0.8
–1.2
—
0.5
–60
Min.
—
—
—
2.0
—
—
2.4
—
–175
T
A
= +25
°
C
Typ.
—
—
—
—
—
—
3.4
0.26
—
Max.
20
100
–600
—
0.8
–1.2
—
0.5
–60
Min.
—
—
—
2.0
—
—
2.4
—
–175
T
A
= +85
°
C
Typ.
—
—
—
—
—
—
3.9
0.27
—
Max.
20
100
–600
—
0.8
–1.2
—
0.5
–60
Unit
µA
µA
µA
V
V
V
V
V
µA
I
IK
= –18mA
I
OH
= –3.0mA
I
OL
= 24mA
V
O
= 0V
Condition
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
NOTES:
1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table 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.
3
Micrel
SY10ELT28
SY100ELT28
AC ELECTRICAL CHARACTERISTICS
V
CC
= +5.0V
±10%
T
A
= –40
°
C
Symbol
f
MAX
t
PLH
t
PHL
V
PP
t
r
t
f
Parameter
MaximumFrequency
(1)
PECL
TTL
Propagation
Delay
Propagation
Delay
DEC L
➝
QTTL
DTTL
➝
QECL
DEC L
➝
QTTL
DTTL
➝
QECL
Min.
700
160
1.5
0.2
1.5
0.2
200
0.15
Typ.
—
—
—
—
—
—
800
—
Max.
—
—
5.5
1.2
5.5
1.2
1000
1.5
Min.
700
160
1.5
0.2
1.5
0.2
200
0.15
T
A
= +25
°
C
Typ.
—
—
—
1.2
—
1.2
800
0.3
Max.
—
—
5.5
1.5
5.5
1.5
1000
1.5
Min.
700
160
1.5
0.2
1.5
0.2
200
0.15
T
A
= +85
°
C
Typ.
—
—
—
—
—
—
800
—
Max.
—
—
5.5
1.35
5.5
1.35
1000
1.5
Unit
MHz
MHz
ns
ns
ns
ns
mV
ns
50Ω to
V
CC
–2V
C
L
= 20pF;
TTL Output
C
L
= 20pF
50Ω toV
CC
–2V
Condition
C
L
= 20pF
50Ω toV
CC
–2V
PECL Input VoltageSwing
(2)
(Single-Ended)
(3)
QECL Output Rise/Fall Times
(20% to 80%)
QTTL Output Rise/Fall Times
(10% to 90%)
TTL
—
1.0
—
—
0.80
—
—
0.7
—
ns
NOTES:
1. f
MAX
is defined as the maximum toggle frequency.
2. V
PP
(Min) is the minimum input swing for which AC parameters are guaranteed.
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