Micrel, Inc.
DIFFERENTIAL
ECL-to-TTL TRANSLATOR
SY100ELT25
SY100ELT25
FEATURES
s
s
s
s
s
2.6ns typical propagation delay
Differential ECL inputs
24mA TTL outputs
Flow-through pinouts
Available in 8-pin SOIC package
DESCRIPTION
The SY100ELT25 is a differential ECL-to-TTL
translator. Because ECL levels are used, a +5V, –5.2V
(or –4.5V) and ground are required. The small outline 8-
lead SOIC package and the single gate of the ELT25
makes it ideal for those applications where performance,
space and low power are at a premium.
The V
BB
output allows the ELT25 to also be used in a
single-ended input mode. In this mode the V
BB
output is
tied to the D input for a non-inverting buffer or the D
input for an inverting buffer. If used the V
BB
pin should
be bypassed to ground via a 0.01µF capacitor.
PIN NAMES
Pin
Q
D
V
CC
V
EE
V
BB
GND
TTL Output
Differential ECL Inputs
Positive Supply
Negative Supply
Reference Output
Ground
Function
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
Rev.: C
Amendment: /0
1
Issue Date: March 2006
Micrel, Inc.
SY100ELT25
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
V
EE
D
D
V
BB
1
2
3
4
8
7
6
5
V
CC
Q
NC
GND
Part Number
SY100ELT25ZC
SY100ELT25ZCTR
(2)
SY100ELT25ZI
SY100ELT25ZITR
(2)
SY100ELT25ZG
(3)
SY100ELT25ZGTR
(2, 3)
Package
Type
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Operating
Range
Commercial
Commercial
Industrial
Industrial
Industrial
Industrial
Package
Marking
XEL25
XEL25
XEL25
XEL25
XEL25 with
Pb-Free bar-line indicator
XEL25 with with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
8-Pin SOIC (Z8-1)
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.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY100ELT25
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
IN
V
OUT
I
OUT
T
LEAD
T
store
T
A
Paramter
Power Supply Voltage
ECL Input Voltage
Voltage Applied to
Output at HIGH State
Current Applied to
Output at LOW State
Lead Temperature
(soldering, 20sec.)
Storage Temperature
Operating Temperature
Value
–0.5 to +7.0
V
EE
to GND+0.5
–0.5 to +5.5
Twice the
Rated I
OL
+260
–65 to +150
–40 to +85
Unit
V
V
V
mA
°C
°C
°C
TRUTH TABLE
D
L
H
Open
D
H
L
Open
Q
L
H
L
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
V
CC
= 4.5V to 5.5V; V
EE
= –4.2V to –5.5V
T
A
= –40
°
C
Symbol
I
CC
I
EE
Parameter
Power Supply Current
Power Supply Current
—
—
14
14
T
A
= 0
°
C
—
—
14
14
T
A
= +25
°
C T
A
= +85
°
C
Condition
—
—
9
5.5
14
14
—
—
14
14
mA
mA
Min. Max. Min. Max. Min. Max. Min. Max. Unit
AC ELECTRICAL CHARACTERISTICS
V
CC
= 4.5V to 5.5V; V
EE
= –4.2V to –5.5V
T
A
= –40
°
C
Symbol
t
PLH
t
PHL
f
MAX
t
r
t
f
Parameter
Propagation Delay
D to Output Q
Maximum Frequency
Output Rise/Fall Time
(1.0V to 2.0V)
1.7
150
—
3.6
—
1.5
T
A
= 0
°
C
1.7
150
—
3.6
—
1.5
T
A
= +25
°
C
1.7
150
—
3.6
—
1.5
T
A
= +85
°
C
Condition
C
L
= 20pF
C
L
= 20pF
C
L
= 20pF
1.7
150
—
3.6
—
1.5
ns
MHz
ns
Min. Max. Min. Max. Min. Max. Min. Max. Unit
TTL DC ELECTRICAL CHARACTERISTICS
V
CC
= 4.5V to 5.5V; V
EE
= –4.2V to –5.5V
T
A
= –40
°
C
Symbol
V
OH
V
OL
I
OS
Parameter
Output HIGH Voltage
Output LOW Voltage
Output Short Circuit Current
2.4
—
–60
—
0.5
–200
T
A
= 0
°
C
2.4
—
–60
—
0.5
–200
T
A
= +25
°
C
2.4
—
–60
—
0.5
–200
T
A
= +85
°
C
Condition
I
OH
= –3.0mA
I
OL
= 24mA
V
OUT
= 0V
2.4
—
–60
—
0.5
–200
V
V
mA
Min. Max. Min. Max. Min. Max. Min. Max. Unit
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY100ELT25
ECL DC ELECTRICAL CHARACTERISTICS
V
CC
= 4.5V to 5.5V; V
EE
= –4.2V to –5.5V
T
A
= –40
°
C
Symbol
I
IH
I
IL
V
CMR
V
PP
V
IH
V
IL
V
BB
Parameter
Input HIGH Current
Input HIGH Current
Common Mode Range
Minimum Peak-to-Peak
Input
(1)
Input HIGH Voltage
Input LOW Voltage
Reference Output
Min.
—
0.5
V
EE
+2.2
T
A
= 0
°
C
Min.
—
0.5
Typ. Max.
—
—
—
—
—
—
—
150
—
T
A
= +25
°
C
Min.
—
0.5
Typ. Max.
—
—
—
—
—
—
—
150
—
T
A
= +85
°
C
Min.
—
0.5
Typ. Max.
—
—
—
—
—
—
—
150
—
GND
—
–880
–1475
–1.26
Unit
µA
µA
V
mV
mV
mV
mV
Typ. Max.
—
—
—
—
—
—
—
150
—
GND
V
EE
+2.2
—
–880
200
–1165
GND
V
EE
+2.2
—
–880
200
–1165
GND
V
EE
+2.2
—
–880
200
–1165
200
–1165
–1810
–1.38
–1475 –1810
–1.26
–1.38
–1475 –1810
–1.26
–1.38
–1475 –1810
–1.26
–1.38
NOTE:
1. 200mV input guarantees full logic at output.
TTL SWITCHING CIRCUIT
V
EE
Use 0.1µF Capacitors
For Decoupling
V
CC
50Ω COAX
PULSE
GENERATOR
IN
DEVICE
UNDER
TEST
OUT
450Ω
50Ω COAX
50Ω COAX
CH A
Use Oscilloscope Internal
50Ω Load For Termination
OSCILLOSCOPE
CH B
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY100ELT25
ECL/TTL PROPAGATION DELAY — SINGLE ENDED
50%
V
IN
t
PLH
1.5V
V
OUT
t
PHL
ECL/TTL WAVEFORMS: RISE AND FALL TIMES
2.0V
V
OUT
t
r
t
f
1V
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
5