MICREL SY10ELT21LZCTR

3.3V DIFFERENTIAL
LVPECL-to-LVTTL
TRANSLATOR
DESCRIPTION
FEATURES
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ClockWorks™
SY10ELT21L
SY100ELT21L
3.3V power supply
2.0ns typical propagation delay
Low power
Differential LVPECL inputs
24mA TTL outputs
Flow-through pinouts
Available in 8-pin SOIC package
The SY10/100ELT21L are single differential LVPECLto-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.
VBB allows a differential, single-ended, or AC-coupled
interface to the device. If used, the VBB output should be
bypassed to VCC with 0.01µF capacitor.
Under open input conditions, the /D will be biased at a
VCC/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.
PIN NAMES
PIN CONFIGURATION/BLOCK DIAGRAM
Pin
NC 1
TTL
D 2
8 VCC
TTL Output
7 Q
D, /D
Differential LVPECL Inputs
6 NC
VCC
+3.3V Supply
VBB
Reference Output
GND
Ground
PECL
D 3
VBB 4
Function
Q
5 GND
Rev.: B
1
Amendment: /0
Issue Date: April 2000
ClockWorks™
SY10ELT21L
SY100ELT21L
Micrel
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
TRUTH TABLE
Value
Unit
D
/D
Q
–0.5 to +3.8
V
L
H
L
0V to VCC+0.5
V
H
L
H
Open
Open
L
Paramter
VCC
Power Supply Voltage
VI
PECL Input Voltage
VO
Voltage Applied to
Output at HIGH State
–0.5 to VCC
V
IO
Current Applied to
Output at LOW State
Twice the
Rated IOL
mA
Tstore
Storage Temperature
–65 to +150
°C
TA
Operating Temperature
–40 to +85
°C
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
VCC = +3.3V ±5%
TA = –40°C
Symbol
TA = 0°C
TA = +25°C
TA = +85°C
Parameter
Min.
Max.
Min.
Max.
Min.
Typ.
Max.
Min.
Max.
Unit
Condition
IOS
Output Short Circuit Current
–80
–275
–80
–275
–80
—
–275
–80
–275
mA
ICC
Power Supply Current
—
20
—
20
—
14
20
—
20
mA
VOH
Output HIGH Voltage
2.0
—
2.0
—
2.0
—
—
2.0
—
V
IOH = –3.0mA
VOL
Output LOW Voltage
—
0.5
—
0.5
—
—
0.5
—
0.5
V
IOL = 24mA
VOUT = 0V
PECL DC ELECTRICAL CHARACTERISTICS
VCC = +3.3V ±5%
TA = –40°C
Symbol
Parameter
TA = 0°C
TA = +25°C
TA = +85°C
Min.
Max.
Min.
Max.
Min.
Typ.
Max.
Min.
Max.
Unit
—
150
—
150
—
—
150
—
150
µA
IIH
Input HIGH Current
IIL
Input LOW Current
D
/D
0.5
–300
—
—
0.5
–300
—
—
0.5
–300
—
—
—
—
0.5
–300
—
—
µA
VIH
Input HIGH Voltage(2) 10ELT
100ELT
2070
2135
2410
2420
2130
2135
2460
2420
2170
2135
—
—
2490
2420
2240
2135
2580
2420
mV
VIL
Input LOW Voltage(2)
10ELT
100ELT
1350
1490
1800
1825
1350
1490
1820
1825
1350
1490
—
—
1820
1825
1350
1490
1855
1825
mV
VBB
Reference Output(2)
10ELT
100ELT
1870
1920
2000
2040
1920
1920
2030
2040
1950
1920
2000
1980
2050
2040
1990
1920
2110
2040
mV
NOTES:
1. These values are for VCC = 3.3V. Level Specifications will vary 1:1 VCC.
2
Condition
ClockWorks™
SY10ELT21L
SY100ELT21L
Micrel
AC ELECTRICAL CHARACTERISTICS
VCC = +3.3V ±5%
TA = –40°C
Symbol
Parameter
TA = 0°C
TA = +25°C
TA = +85°C
Min.
Max.
Min.
Max.
Min.
Typ.
Max.
Min.
Max.
Unit
Condition
tPLH
tPHL
Propagation Delay
1.5
2.5
1.5
2.5
1.5
2.0
2.5
1.5
2.5
ns
CL = 20pF
tskpp
Part-to-Part Skew(1,2)
—
0.5
—
0.5
—
—
0.5
—
0.5
ns
CL = 20pF
CL = 20pF
Frequency(2,3,4)
fMAX
Maximum Input
275
—
275
—
275
—
—
275
—
MHz
VCMR
Common Mode Range
1.2
VCC
1.2
VCC
1.2
—
VCC
1.2
VCC
V
VPP
Minimum Peak-to-Peak Input(5)
100
—
100
—
100
—
—
100
—
mV
tr
tf
Output Rise/Fall Time
(1.0V to 2.0V)
0.5
1.0
0.5
1.0
0.5
—
1.0
0.5
1.0
ns
NOTES:
1. Part-to-Part Skew considering HIGH-to-HIGH transitions at common VCC 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 fMAX 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
Package
Type
Operating
Range
VCC Range
(V)
SY10ELT21LZC
Z8-1
Commercial
+3.3V ±5%
SY10ELT21LZCTR
Z8-1
Commercial
+3.3V ±5%
SY100ELT21LZC
Z8-1
Commercial
+3.3V ±5%
SY100ELT21LZCTR
Z8-1
Commercial
+3.3V ±5%
3
CL = 20pF
ClockWorks™
SY10ELT21L
SY100ELT21L
Micrel
8 LEAD SOIC .150" WIDE (Z8-1)
Rev. 03
MICREL-SYNERGY
TEL
3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
+ 1 (408) 980-9191
FAX
+ 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.
© 2000 Micrel Incorporated
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