LT1719IS6#TRPBF Linear Technology, LT1719IS6#TRPBF Datasheet - Page 14

• Manufacturer Part Number: LT1719IS6#TRPBF
• Description: IC COMP R-RINOUT SINGLE SOT23-6
• Manufacturer: Linear Technology
• Series: UltraFast™r
• Type: General Purposer

Specifications of LT1719IS6#TRPBF

• Number Of Elements: 1
• Output Type: CMOS, Rail-to-Rail, TTL
• Voltage - Supply: 2.7 V ~ 6 V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LT1719
APPLICATIONS INFORMATION
Interfacing the LT1719 to ECL
The LT1719 comparators can be used in high speed ap-
plications where emitter-coupled logic (ECL) is deployed.
To interface the output of the LT1719 to ECL logic inputs,
standard TTL/CMOS to ECL level translators such as the
10H124, 10H424 and 100124 can be used. These com-
ponents come at a cost of a few nanoseconds additional
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.
14
(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
LT1719
LT1719
LT1719
+V
LSTTL
S
3V
or V
+
5V
180Ω
270Ω
820Ω
R1
R4
R4
+V
R1
S
R1
or V
V
R2
R3
ECL
+
5V
R2
R3
R2
10KH/E
R3
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
10KH/E
100K/E
Figure 6a shows the standard TTL to Positive ECL (PECL)
resistive level translator. This translator cannot be used
for the LT1719, or with CMOS logic, because it depends
on the 820Ω resistor to limit the output swing (V
the all-NPN TTL gate with its so-called totem-pole output.
The LT1719 is fabricated in a complementary bipolar
process and the output stage has a PNP driver that pulls
the output nearly all the way to the supply rail, even when
sourcing 10mA.
OR V
V
4.5V
ECL
+
510Ω
620Ω
R1
–5.2V
–4.5V
V
300Ω
330Ω
ECL
R1
180Ω
180Ω
R2
+V
180Ω
180Ω
R2
S
5V
3V
5V
3V
OR V
750Ω
510Ω
R3
1500Ω
OMIT
+
R3
560Ω
270Ω
680Ω
330Ω
R1
1000Ω
560Ω
R4
270Ω
510Ω
270Ω
390Ω
R2
330Ω
300Ω
300Ω
270Ω
R3
1200Ω
1500Ω
330Ω
430Ω
R4
1719 F06
OH
1719fa
) of