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 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 registered trademark of Micrel, Inc.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
Rev.: D
Amendment: /0
1
Issue Date: March 2006
Micrel, Inc.
Precision Edge
®
SY10ELT21L
SY100ELT21L
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
NC 1
D 2
PECL
TTL
8 V
CC
7 Q
6 NC
5 GND
Part Number
SY10ELT21LZC
SY10ELT21LZCTR
(2)
SY100ELT21LZC
SY100ELT21LZCTR
(2)
Package
Type
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Z8-1
Operating
Range
Commercial
Commercial
Commercial
Commercial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Package
Marking
HEL21L
HEL21L
XEL21L
XEL21L
HEL21L
HEL21L
XEL21L
XEL21L
HEL21L with
Pb-Free bar-line indicator
HEL21L with
Pb-Free bar-line indicator
XEL21L with
Pb-Free bar-line indicator
XEL21L with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
Pb-Free
NiPdAu
Pb-Free
NiPdAu
D 3
V
BB
4
8-Pin SOIC (Z8-1)
SY10ELT21LZI
SY10ELT21LZITR
(2)
SY100ELT21LZI
SY100ELT21LZITR
(2)
SY10ELT21LZG
(3)
SY10ELT21LZGTR
(2, 3)
SY100ELT21LZG
(3)
SY100ELT21LZG
(
TR
(2, 3)
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.
Precision Edge
®
SY10ELT21L
SY100ELT21L
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
I
V
O
I
O
T
LEAD
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
Lead Temperature
(soldering, 20sec.)
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
+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.
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
Max.
150
—
—
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
Max.
150
—
—
Unit
µA
µA
mV
mV
mV
Condition
Input HIGH Voltage
(2)
10ELT
100ELT
Input LOW Voltage
(2)
Reference Output
(2)
10ELT
100ELT
10ELT
100ELT
2070 2410
2135 2420
1350 1800
1490 1825
1870 2000
1920 2040
2240 2580
2135 2420
1350 1855
1490 1825
1990 2110
1920 2040
NOTES:
1. These values are for V
CC
= 3.3V. Level Specifications will vary 1:1 V
CC
.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
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.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precision Edge
®
SY10ELT21L
SY100ELT21L
8-PIN SOIC .150" WIDE (Z8-1)
Rev. 03
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
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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