The SY10/100ELT21 are single differential PECL-to-
TTL translators. Because PECL (Positive ECL) levels are
used, only +5V and ground are required. The small outline
8-lead SOIC package and low skew single gate design
make the ELT21 ideal for applications that require the
translation of a clock or data signal where minimal space,
low power, and low cost are critical.
The V
BB
output allow differential single-ended, or AC-
coupled interface to the device. If used, the V
BB
output
should be bypassed to V
CC
with a 0.01µF capacitor.
The ELT21 is available in both ECL standards: the
10ELT is compatible with positive ECL 10H logic levels,
while the 100ELT is compatible with positive ECL 100K
logic levels.
PIN CONFIGURATION/BLOCK DIAGRAM
PIN NAMES
Pin
Q
TTL Output
Differential PECL Inputs
+5.0V Supply
Reference Output
Ground
Function
NC 1
D 2
PECL
TTL
8 V
CC
7 Q
6 NC
5 GND
D, /D
V
CC
V
BB
GND
D 3
V
BB
4
SOIC
TOP VIEW
Rev.: B
Amendment: /0
1
Issue Date: April 2000
Micrel
ClockWorks™
SY10ELT21
SY100ELT21
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
I
V
O
I
O
T
store
T
A
Parameter
Power Supply Voltage
PECL Input Voltage
Voltage Applied to
Output at HIGH State
Current Applied to
Output at LOW State
Storage Temperature
Operating Temperature
Value
–0.5 to +7.0
0V to V
CC
+0.5
–0.5 to +5.5
Twice the
Rated I
OL
–65 to +150
–40 to +85
Unit
V
V
V
mA
°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.
TTL DC ELECTRICAL CHARACTERISTICS
V
CC
= 4.75V to 5.25V
T
A
= –40
°
C
Symbol
I
OS
I
CC
V
OH
V
OL
Parameter
Output Short Circuit Current
Power Supply Current
Output HIGH Voltage
Output LOW Voltage
Min.
–80
—
2.5
2.0
—
Max.
–200
20
—
—
0.5
T
A
= 0
°
C
Min.
–80
—
2.5
2.0
—
Max.
–200
20
—
—
0.5
T
A
= +25
°
C
Min.
–80
—
2.5
2.0
—
Typ.
—
14
—
—
—
Max.
–200
20
—
—
0.5
T
A
= +85
°
C
Min.
–80
—
2.5
2.0
—
Max.
–200
20
—
—
0.5
Unit
mA
mA
V
V
V
Condition
V
OUT
= 0V
—
I
OH
= –3.0mA
I
OH
= –15mA
I
OL
= 24mA
PECL DC ELECTRICAL CHARACTERISTICS
V
CC
= 4.75V to 5.25V
T
A
= –40
°
C
Symbol
I
IH
I
IL
V
IH
V
IL
V
BB
Parameter
Input HIGH Current
Input LOW Current
Input HIGH Voltage
(2)
10ELT
100ELT
Input LOW Voltage
(2)
10ELT
100ELT
Reference Output
(2)
10ELT
100ELT
Min.
—
0.5
3770
3835
3050
3190
3570
3620
Max.
150
—
4110
4120
3500
3525
3700
3740
T
A
= 0
°
C
Min.
—
0.5
3830
3835
3050
3190
3620
3620
Max.
150
—
4160
4120
3520
3525
3730
3740
—
0.5
3870
3835
3050
3190
3650
3620
T
A
= +25
°
C
Min.
Typ.
—
—
—
—
—
—
—
Max.
150
—
4190
4120
3520
3525
3750
3740
T
A
= +85
°
C
Min.
—
0.5
3940
3835
3050
3190
3690
3620
Max.
150
—
4280
4120
3555
3525
3810
3740
Unit
µA
µA
mV
mV
mV
Condition
NOTES:
1. These values are for V
CC
= 5.0V. Level Specifications will vary 1:1 V
CC
.
2
Micrel
ClockWorks™
SY10ELT21
SY100ELT21
AC ELECTRICAL CHARACTERISTICS
V
CC
= 4.75V to 5.25V
T
A
= –40
°
C
Symbol
t
PLH
t
PHL
t
skpp
f
MAX
V
CMR
V
PP
t
r
t
f
Parameter
Propagation Delay
D to Output Q
Part-to-Part Skew
(1, 2)
Maximum Input Frequency
(2, 3, 4)
T
A
= 0
°
C
Min.
2.0
—
160
2.4
200
—
Max.
3.0
0.5
—
V
CC
—
1.5
T
A
= +25
°
C
Min.
2.0
—
160
2.4
200
—
Typ.
—
—
—
—
—
—
Max.
3.0
0.5
—
V
CC
—
1.5
T
A
= +85
°
C
Min.
2.0
—
160
2.4
200
—
Max.
3.0
0.5
—
V
CC
—
1.5
Unit
ns
ns
MHz
V
mV
ns
C
L
= 50pF
Condition
C
L
= 50pF
C
L
= 50pF
C
L
= 50pF
Min.
2.0
—
160
2.4
200
—
Max.
3.0
0.5
—
V
CC
—
1.5
Common Mode Range
Minimum Peak-to-Peak Input
(5)
Output Rise/Fall Time
(1.0V to 2.0V)
NOTES:
1. Part-to-Part Skew considering HIGH-to-HIGH transitions at common V
CC
levels.
2. These parameters are guaranteed, but not tested.
3. Frequency at which output levels will meet a 0.8V to 2.0V minimum swing.
4. The f
MAX
value is specified as the minimum guaranteed maximum frequency. Actual operational maximum frequency may be greater.
5. 200mV input guarantees full logic at output.
PRODUCT ORDERING CODE
Ordering
Code
SY10ELT21ZC
SY10ELT21ZCTR
SY100ELT21ZC
SY100ELT21ZCTR
Package
Type
Z8-1
Z8-1
Z8-1
Z8-1
Operating
Range
Commercial
Commercial
Commercial
Commercial
V
CC
Range
(V)
+4.75 to +5.25
+4.75 to +5.25
+4.75 to +5.25
+4.75 to +5.25
3
Micrel
ClockWorks™
SY10ELT21
SY100ELT21
8 LEAD SOIC .150" WIDE (Z8-1)
Rev. 03
MICREL-SYNERGY
TEL
3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
FAX
+ 1 (408) 980-9191
+ 1 (408) 914-7878
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
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