The SY10/100ELT21L are single differential LVPECL-
to-LVTTL translators using a single +3.3V power supply.
Because LVPECL (Low Voltage Positive ECL) levels are
used, only +3.3V and ground are required. The small
outline 8-lead SOIC package and low skew single gate
design make the ELT21L ideal for applications that require
the translation of a clock or data signal where minimal
space, low power, and low cost are critical.
V
BB
allows a differential, single-ended, or AC-coupled
interface to the device. If used, the V
BB
output should be
bypassed to V
CC
with 0.01µF capacitor.
Under open input conditions, the /D will be biased at a
V
CC
/2 voltage level and the D input will be pulled to
ground. This condition will force the Q output low to
provide added stability.
The ELT21L 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.
s
Flow-through pinouts
s
Available in 8-pin SOIC package
PIN CONFIGURATION/BLOCK DIAGRAM
NC 1
D 2
PECL
TTL
8 V
CC
7 Q
6 NC
5 GND
D 3
V
BB
4
PIN NAMES
Pin
Q
D, /D
V
CC
V
BB
GND
TTL Output
Differential LVPECL Inputs
+3.3V Supply
Reference Output
Ground
Function
Precision Edge is a trademark of Micrel, Inc.
Rev.: C
Amendment: /0
1
Issue Date: February 2003
Micrel
Precision Edge™
SY10ELT21L
SY100ELT21L
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
I
V
O
I
O
T
store
T
A
Paramter
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 +3.8
0V to V
CC
+0.5
–0.5 to V
CC
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
= +3.3V
±5%
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
—
2.0
—
Max.
–275
20
—
0.5
T
A
= 0
°
C
Min.
–80
—
2.0
—
Max.
–275
20
—
0.5
T
A
= +25
°
C
Min.
–80
—
2.0
—
Typ.
—
14
—
—
Max.
–275
20
—
0.5
T
A
= +85
°
C
Min.
–80
—
2.0
—
Max.
–275
20
—
0.5
Unit
mA
mA
V
V
I
OH
= –3.0mA
I
OL
= 24mA
Condition
V
OUT
= 0V
PECL DC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V
±5%
T
A
= –40
°
C
Symbol
I
IH
I
IL
V
IH
V
IL
V
BB
Parameter
Input HIGH Current
Input LOW Current
D
/D
Min.
—
0.5
–300
2070
2135
1350
1490
1870
1920
Max.
150
—
—
2410
2420
1800
1825
2000
2040
T
A
= 0
°
C
Min.
—
0.5
–300
2130
2135
1350
1490
1920
1920
Max.
150
—
—
2460
2420
1820
1825
2030
2040
—
0.5
–300
2170
2135
1350
1490
1950
1920
T
A
= +25
°
C
Min.
Typ.
—
—
—
—
—
—
—
2000
1980
Max.
150
—
—
2490
2420
1820
1825
2050
2040
T
A
= +85
°
C
Min.
—
0.5
–300
2240
2135
1350
1490
1990
1920
Max.
150
—
—
2580
2420
1855
1825
2110
2040
Unit
µA
µA
mV
mV
mV
Condition
Input HIGH Voltage
(2)
10ELT
100ELT
Input LOW Voltage
(2)
Reference Output
(2)
10ELT
100ELT
10ELT
100ELT
NOTES:
1. These values are for V
CC
= 3.3V. Level Specifications will vary 1:1 V
CC
.
2
Micrel
Precision Edge™
SY10ELT21L
SY100ELT21L
AC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V
±5%
T
A
= –40
°
C
Symbol
t
PLH
t
PHL
t
skpp
f
MAX
V
CMR
V
PP
t
r
t
f
Parameter
Propagation Delay
Part-to-Part Skew
(1,2)
Min.
1.5
—
Max.
2.5
0.5
—
V
CC
—
1.0
T
A
= 0
°
C
Min.
1.5
—
275
1.2
100
0.5
Max.
2.5
0.5
—
V
CC
—
1.0
1.5
—
275
1.2
100
0.5
T
A
= +25
°
C
Min.
Typ.
2.0
—
—
—
—
—
Max.
2.5
0.5
—
V
CC
—
1.0
T
A
= +85
°
C
Min.
1.5
—
275
1.2
100
0.5
Max.
2.5
0.5
—
V
CC
—
1.0
Unit
ns
ns
MHz
V
mV
ns
C
L
= 20pF
Condition
C
L
= 20pF
C
L
= 20pF
C
L
= 20pF
Maximum Input Frequency
(2,3,4)
275
Common Mode Range
Minimum Peak-to-Peak Input
(5)
Output Rise/Fall Time
(1.0V to 2.0V)
1.2
100
0.5
NOTES:
1. Part-to-Part Skew considering HIGH-to-HIGH transitions at common V
CC
level.
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. 100mV input guarantees full logic at output.
PRODUCT ORDERING CODE
Ordering
Code
SY10ELT21LZC
SY10ELT21LZCTR*
SY100ELT21LZC
SY100ELT21LZCTR*
Package
Type
Z8-1
Z8-1
Z8-1
Z8-1
Operating
Range
Commercial
Commercial
Commercial
Commercial
Marking
Code
HEL21L
HEL21L
XEL21L
XEL21L
Ordering
Code
SY10ELT21LZI
(1)
SY10ELT21LZITR*
(1)
SY100ELT21LZI
(1)
SY100ELT21LZITR*
(1)
Package
Type
Z8-1
Z8-1
Z8-1
Z8-1
Operating
Range
Industrial
Industrial
Industrial
Industrial
Marking
Code
HEL21L
HEL21L
XEL21L
XEL21L
*Tape and Reel
Note 1.
Recommended for new designs.
3
Micrel
Precision Edge™
SY10ELT21L
SY100ELT21L
8 LEAD SOIC .150" WIDE (Z8-1)
Rev. 03
MICREL, INC.
TEL
1849 FORTUNE DRIVE SAN JOSE, CA 95131
FAX
USA
+ 1 (408) 944-0800
+ 1 (408) 944-0970
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
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