lt1719cs8-trpbf Linear Technology Corporation, lt1719cs8-trpbf Datasheet - Page 12

• Manufacturer Part Number: lt1719cs8-trpbf
• Description: 4.5ns Single/dual Supply 3v/5v Comparator With Rail-to-rail Output
• Manufacturer: Linear Technology Corporation

APPLICATIONS
LT1719
Interfacing the LT1719 to ECL
The LT1719 comparators can be used in high speed
applications where Emitter-Coupled Logic (ECL) is de-
ployed. To interface the output of the LT1719 to ECL logic
inputs, standard TTL/CMOS to ECL level translators such
12
(a) STANDARD TTL TO PECL TRANSLATOR
(b) LT1719 OUTPUT TO PECL TRANSLATOR
(c) 3V LT1719 OUTPUT TO PECL TRANSLATOR
(d) LT1719 OUTPUT TO STANDARD ECL TRANSLATOR
U
LT1719
LT1719
LT1719
+V
LSTTL
S
INFORMATION
3V
or V
U
+
5V
180
270
820
R1
R4
+V
R4
R1
W
S
R1
or V
V
R2
R3
ECL
+
5V
R2
R3
R2
10KH/E
R3
U
V
ECL
DO NOT USE FOR LT1719
LEVEL TRANSLATION. SEE TEXT
10KH/E
100K/E
10KH/E
100K/E
Figure 6
5V OR 5.2V
+ V
ECL FAMILY
S
5V OR 5.2V
4.5V
as the 10H124, 10H424 and 100124 can be used. These
components come at a cost of a few nanoseconds addi-
tional delay as well as supply currents of 50mA or more,
and are only available in quads. A faster, simpler and lower
power translator can be constructed with resistors as
shown in Figure 6.
10KH/E
100K/E
OR V
V
4.5V
ECL
+
510
620
R1
– 5.2V
– 4.5V
V
300
330
ECL
R1
180
180
R2
+ V
180
180
R2
S
5V
3V
5V
3V
OR V
750
510
R3
1500
OMIT
+
R3
560
270
680
330
R1
1000
560
R4
270
510
270
390
R2
330
300
300
270
R3
1200
1500
330
430
R4
1719 F06