Pin
Function
Q
LVTTL Output
D, /D
Differential LVPECL Input Pair
V
CC
Positive Supply
V
BB
Output Reference Voltage
GND
Ground
DESCRIPTION
s
3.3V power supply
s
1.9ns typical propagation delay
s
275MHz f
MAX
(Clock bit stream, not pseudo-random)
s
Differential LVPECL inputs
s
24mA LVTTL outputs
s
Flow-through pinouts
s
Internal input resistors: pulldown on D, pulldown
and pullup on /D
s
Q output will default LOW with inputs open or at
GND
s
V
BB
output
s
Available in 8-pin MSOP and SOIC package
The SY100EPT21L is a single differential LVPECL-to-
LVTTL translator 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 EPT21L 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 0.01
F 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 100EPT is compatible with positive ECL 100K
logic levels.
FEATURES
3.3V DIFFERENTIAL
LVPECL-to-LVTTL
TRANSLATOR
PIN NAMES
PIN CONFIGURATION/BLOCK DIAGRAM
(Available in 8-pin SOIC and 8-pin MSOP)
SY100EPT21L
1
NC
D
D
V
BB
8
V
CC
Q
NC
GND
7
6
5
2
3
4
LVPECL
LVTTL
1
Rev.: A
Amendment: /1
Issue Date:
July 2000
2
SY100EPT21L
Micrel
TRUTH TABLE
D
/D
Q
L
H
L
H
L
H
Open
Open
L
Symbol
Paramter
Value
Unit
V
CC
Power Supply Voltage
0.5 to +3.8
V
V
I
PECL Input Voltage
0V to V
CC
+0.5
V
V
O
Voltage Applied to
0.5 to V
CC
V
Output at HIGH State
I
O
Current Applied to
Twice the
mA
Output at LOW State
Rated I
OL
T
store
Storage Temperature
65 to +150
C
T
A
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.
ABSOLUTE MAXIMUM RATINGS
(1)
T
A
= 40
C
T
A
= 0
C
T
A
= +25
C
T
A
= +85
C
Symbol
Parameter
Min.
Max.
Min.
Max.
Min.
Typ.
Max.
Min.
Max.
Unit
Condition
I
OS
Output Short Circuit Current
80
275
80
275
80
--
275
80
275
mA
V
OUT
= 0V
I
CC
Power Supply Current
--
20
--
20
--
14
20
--
20
mA
V
OH
Output HIGH Voltage
2.0
--
2.0
--
2.0
--
--
2.0
--
V
I
OH
= 3.0mA
V
OL
Output LOW Voltage
--
0.5
--
0.5
--
--
0.5
--
0.5
V
I
OL
= 24mA
LVTTL DC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V
5%
T
A
= 40
C
T
A
= 0
C
T
A
= +25
C
T
A
= +85
C
Symbol
Parameter
Min.
Max.
Min.
Max.
Min.
Typ.
Max.
Min.
Max.
Unit
Condition
I
IH
Input HIGH Current
--
150
--
150
--
--
150
--
150
A
I
IL
Input LOW Current
D
0.5
--
0.5
--
0.5
--
--
0.5
--
A
/D
300
--
300
--
300
--
--
300
--
V
IH
Input HIGH Voltage
(2)
100EPT
2135
2420
2135
2420
2135
--
2420
2135
2420
V
IL
Input LOW Voltage
(2)
100EPT
1490
1825
1490
1825
1490
--
1825
1490
1825
V
BB
Reference Output
(2)
100EPT
1920
2040
1920
2040
1920
1980
2040
1920
2040
LVPECL DC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V
5%
NOTES:
1. These values are for V
CC
= 3.3V. Level Specifications will vary 1:1 V
CC
.
3
SY100EPT21L
Micrel
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.
T
A
= 40
C
T
A
= 0
C
T
A
= +25
C
T
A
= +85
C
Symbol
Parameter
Min.
Max.
Min.
Max.
Min.
Typ.
Max.
Min.
Max.
Unit
Condition
t
PLH
Propagation Delay
1.5
2.5
1.5
2.5
1.5
1.9
2.5
1.5
2.5
ns
C
L
= 20pF
t
PHL
t
skpp
Part-to-Part Skew
(1,2)
--
0.5
--
0.5
--
--
0.5
--
0.5
ns
C
L
= 20pF
f
MAX
Maximum Input Frequency
(3,4)
275
--
275
--
275
--
--
275
--
MHz
C
L
= 20pF
V
CMR
Common Mode Range
1.2
V
CC
1.2
V
CC
1.2
--
V
CC
1.2
V
CC
V
V
PP
Minimum Peak-to-Peak Input
(5)
100
--
100
--
100
--
--
100
--
mV
t
r
Output Rise/Fall Time
0.5
1.0
0.5
1.0
0.5
--
1.0
0.5
1.0
ns
C
L
= 20pF
t
f
(1.0V to 2.0V)
AC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V
5%
PRODUCT ORDERING CODE
Ordering
Package
Operating
V
CC
Range
Code
Type
Range
(V)
SY100EPT21LZC
Z8-1
Commercial
+3.3V
5%
SY100EPT21LZCTR
Z8-1
Commercial
+3.3V
5%
SY100EPT21LKC
K8-1
Commercial
+3.3V
5%
SY100EPT21LKCTR
K8-1
Commercial
+3.3V
5%
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