FEATURES
s
Operates from a single +5V supply
s
Differential PECL outputs
s
Function and pinout compatible with Fairchild F100K
s
Available in 24-pin CERPACK and 28-pin PLCC
packages
DESCRIPTION
The SY100S391 is a hex TTL-to-PECL translator for
converting TTL logic levels to 100K logic levels. The unique
feature of this translator is the ability to do this translation
using only one +5V supply. The differential outputs allow
each circuit to be used as an inverting/non-inverting translator,
or as a differential line driver. A common enable (E), when
LOW, holds all inverting outputs HIGH and all non-inverting
inputs LOW.
The SY100S391 is ideal for those mixed PECL/TTL
applications which only have a +5V supply available. When
used in the differential mode, the S391, due to its high
common mode rejection, overcomes voltage gradients
between the TTL and PECL ground systems.
Rev.: G
Amendment: /0
Issue Date:
July, 1999
SY100S391
PIN CONFIGURATIONS
LOW-POWER
HEX TTL-TO-PECL
TRANSLATOR
Q
2
V
CCA
V
CC
V
CC
D
2
GND PECL
GND PECL
GND TTL
E
GNDS
4
3
2
1
28
27
12
13
14
15
16
17
19
11
20
10
21
9
22
8
23
7
24
6
Top View
PLCC
J28-1
Q
3
D
3
26
18
25
5
D
1
D
0
Q
0
GNDS
Q
1
Q
1
Q
0
Q
2
Q
3
Q
5
GNDS
D
5
D
4
Q
4
Q
5
Q
4
Pin
Function
D
0
-- D
5
Data Inputs (TTL)
Q
0
-- Q
5
Data Outputs (PECL)
Q
0
-- Q
5
Inverting Data Outputs (PECL)
E
Enable Input (TTL)
V
CCA
V
CCO
for ECL Outputs
PIN NAMES
BLOCK DIAGRAM
D
0
D
1
D
2
D
3
D
4
D
5
E
Q
0
Q
0
Q
1
Q
1
Q
2
Q
2
Q
3
Q
3
Q
4
Q
4
Q
5
Q
5
18
17
16
15
14
13
1
2
3
4
5
6
7
24
8
23
9
22
10
21
11
20
12
19
Top View
Flatpack
F24-1
D
3
GND PECL
GND TTL
D
2
E
GND PEC
L
Q
5
Q
4
D
5
D
4
Q
5
Q
4
V
CC
V
CCA
Q
3
Q
2
Q
3
Q
2
D
0
D
1
Q
0
Q
1
Q
0
Q
1
1
2
SY100S391
Micrel
Symbol
Parameter
Min.
Typ.
Max. Unit
Condition
V
OH
Output HIGH Voltage
V
CC
1025
V
CC
955
V
CC
870 mV
V
IN
= V
IH
(Max.) or V
IL
(Min.)
V
OL
Output LOW Voltage
V
CC
1890
V
CC
1705
V
CC
1620
Loading with 50
to V
CC
2V
V
OHC
Output HIGH Voltage
V
CC
1035
--
-- mV
V
IN
= V
IH
(Min.) or V
IL
(Max.)
Corner Point High
Loading with 50
to V
CC
2V
V
OLC
Output LOW Voltage
--
--
V
CC
1610 mV
Corner Point Low
V
IH
Input HIGH Voltage
2.0
--
5.0 V
Over V
TTL
, V
EE
, T
A
Range
V
IL
Input LOW Voltage
0
--
0.8 V
Over V
TTL
, V
EE
, T
A
Range
I
IH
Input HIGH Current
--
--
10
µ
A
V
IN
= +2.7V
Breakdown Current
--
--
100
µ
A
V
IN
= +5.5V, V
CC
= Max.
I
IL
Input LOW Current
D
n
--
--
0.8 mA
V
IN
= +0.5V
E
4.2
V
CD
Input Clamp Diode Voltage
--
--
1.2 V
I
IN
= 18mA
I
CC
V
CC
Supply Current
25
--
69 mA
Inputs Open
Inputs
Outputs
D
n
E
Q
n
Q
n
H
H
H
L
L
H
L
H
H
L
L
H
L
L
L
H
TRUTH TABLE
NOTE:
1. H = High Voltage Level, L = Low Voltage Level
LOGIC SYMBOL
E
D
0
D
1
D
2
D
3
D
4
D
5
Q
0
Q
0
Q
1
Q
1
Q
2
Q
2
Q
3
Q
3
Q
4
Q
4
Q
5
Q
5
Symbol
Rating
Value
Unit
--
TTL Input Voltage
(2)
0.5 to +7.0
V
--
TTL Input Current
(2)
30 to +5.0
V
--
PECL Output Current
50
V
(DC Output HIGH)
--
V
CC
Pin Potential to
0.5 to +7.0
V
Ground Pin
T
store
Storage Temperature
65 to +150
°C
T
J
Max. Junction Temp.
°C
Ceramic
+175
Plastic
+150
ABSOLUTE MAXIMUM RATINGS
(1)
NOTES:
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.
2. Either voltage limit or current limit is siffucient to protect inputs.
TTL-TO-PECL DC ELECTRICAL CHARACTERISTICS
(1)
V
CC
= +5.0V
±
10%; GND = 0V
NOTE:
1. The specified limits represent the "worst case" value for the parameter. Since these values normally occur at the temperature extremes, additional noise
immunity and guardbanding can be achieved by decreasing the allowable system operating ranges. Conditions for testing shown in the tables are chosen
to guarantee operation under "worst case" conditions.
Symbol
Rating
Value
Unit
T
A
Operating Temperature
°C
Commercial
0 to +85
V
CC
Supply Voltage
+4.5 to +5.5
V
GUARANTEED OPERATING CONDITIONS
(1)
NOTE:
1. Do not exceed.
3
SY100S391
Micrel
CERPACK AND PLCC
V
CC
= +5.0V
±
10%
AC ELECTRICAL CHARACTERISTICS
T
A
= 0
°
C
T
A
= +25
°
C
T
A
= +85
°
C
Symbol
Parameter
Min.
Max.
Min.
Max.
Min.
Max.
Unit
Condition
t
PLH
Propagation Delay
400
1400
400
1400
400
1400
ps
t
PHL
Data and Enable to Output
t
TLH
Transition Time
350
1700
350
1700
350
1700
ps
t
THL
20% to 80%, 80% to 20%
TIMING DIAGRAM
Propagation Delay and Transition Times
2.5
±
0.3ns
2.5
±
0.3ns
INPUT
3.0V
1.5V
0V
90%
50%
10%
COMPLEMENT
t
PHL
t
PLH
50%
OUTPUT
t
PLH
t
PHL
80%
50%
20%
t
TLH
t
THL
TRUE
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