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 NAMES
Pin
Q
D, /D
V
CC
V
BB
GND
TTL Output
Differential PECL Inputs
+5.0V Supply
Reference Output
Ground
Function
Precision Edge is a registered trademark of Micrel, Inc.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
Rev.: C
Amendment: /0
1
Issue Date: March 2006
Micrel, Inc.
Precision Edge
®
SY10ELT21
SY100ELT21
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
NC 1
D 2
PECL
TTL
8 V
CC
7 Q
6 NC
5 GND
Part Number
SY10ELT21ZC
SY10ELT21ZCTR
(2)
SY100ELT21ZC
SY100ELT21ZCTR
(2)
SY10ELT21ZI
SY10ELT21ZITR
(2)
SY100ELT21ZI
SY100ELT21ZITR
(2)
SY10ELT21ZG
(3)
SY10ELT21ZGTR
(2, 3)
SY100ELT21ZG
(3)
SY100ELT21ZG
(
TR
(2, 3)
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
HEL21
HEL21
XEL21
XEL21
HEL21
HEL21
XEL21
XEL21
HEL21 with
Pb-Free bar-line indicator
HEL21 with
Pb-Free bar-line indicator
XEL21 with
Pb-Free bar-line indicator
XEL21 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)
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.
Precison Edge
®
SY10ELT21
SY100ELT21
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
I
V
O
I
O
T
LEAD
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
Lead Temperature
(soldering, 20sec.)
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
+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
= 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
Max.
150
—
T
A
= 0°C
Min.
—
0.5
Max.
150
—
T
A
= +25°C
Min.
—
0.5
3870
3835
3050
3190
3650
3620
Typ.
—
—
—
—
—
—
—
Max.
150
—
4190
4120
3520
3525
3750
3740
T
A
= +85°C
Min.
—
0.5
Max.
150
—
Unit
µA
µA
mV
mV
mV
Condition
3770 4110
3835 4120
3050 3500
3190 3525
3570 3700
3620 3740
3830 4160
3835 4120
3050 3520
3190 3525
3620 3730
3620 3740
3940 4280
3835 4120
3050 3555
3190 3525
3690 3810
3620 3740
NOTE:
2. These values are for V
CC
= 5.0V. Level Specifications will vary 1:1 V
CC
.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
Precision Edge
®
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.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
Precison Edge
®
SY10ELT21
SY100ELT21
8 LEAD SOIC .150" WIDE (Z8-1)
Rev. 03
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL
+ 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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