LS7272
LS7273
LS7272-20
LS7273-20
VOLT QUAD-CHANNEL DIFFERENTIAL LINE DRIVER
30
LSI
LSI
A 1
AO 2
AO 3
LS7272
OPD 4
BO 5
BO 6
B
7
Nov 2012
PIN ASSIGNMENT – TOP VIEW
FEATURES:
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More feature-rich and cost-effective than the OL7272 and ET7273
Pin to pin replaceable with the OL7272 and functionally equivalent to the ET7273
Push-Pull or Open-Drain output drivers (LS7272)
Open-Drain output drivers only (LS7273)
Voltage Range: 4.5V – 30V (V
DD
– V
SS
)
120mA Sink/Source output drive
Operating frequency up to 4 MHz
Thermal shutdown protection for output driver overload
Enable input with Thermal Shutdown disconnect feature
1.5A dynamic peak output current drive
Outputs RS422A compatible
Inputs CMOS/TTL compatible with hysteresis
Output drivers fully connected or high-impedance state
PART NUMBER ORDERING INFORMATION:
This part is available in three package styles, DIP, SOIC, and TSSOP.
For DIP packages:
LS7272,
LS7273,
LS7272-20, LS7273-20
For SOIC packages: LS7272-S, LS7273-S, LS7272-S20, LS7273-S20
For TSSOP packages: LS7272-TS, LS7273-TS, LS7272TS20, LS7273TS20
16 VDD
15 D
14 DO
13 DO
12 ENA
11 CO
10 CO
9 C
VSS 8
FIGURE 1
DESCRIPTION:
The
LS7272/LS7273
are short-circuit proof Quad Differential Industrial Power Line Drivers. They
can operate up to 30V and have a selectable thermal shutdown features.
LSI
The Data inputs are TTL / CMOS compatible and can also be driven up to the supply voltage V
DD
.
The ENA input can be used to place all the outputs in a high impedance state. For the LS7272
the OPD input is used to connect the outputs as push-pull drivers or open-drain drivers, where
the outputs can be returned through external loads to a maximum voltage of V
DD
.
For the LS7273, pin4 is LOW and is tied to ground. The outputs are open drain and the loads can
be returned to any voltage between 4.5V and 30V independent of V
DD
.
An internal 5V regulated supply is used to power the logic and level converter blocks.
The thermal shutdown block located in the center of the IC can be disabled by setting the ENA
input, Pin 12, to a voltage between 7.5V and 12V.
Upon power-up, a Power-On-Reset (POR) circuit block forces all output drivers to the high-
impedance state until the power supply voltage reaches a nominal 3.8V. Included in the POR
circuit block is a hysteresis of 100mV such that if the power supply drops below 3.7V all output
drivers are forced to the high-impedance state until the voltage rises above 3.8V. There is a built-
in 5μs delay for disabling the output drivers should the power supply drop below 3.7V. The output
drivers are immediately enabled when the voltage rises above 3.8V.
A
1
16 VDD
15 D
14 DO
LS7273
13 DO
12 ENA
11 CO
10 CO
9 C
AO 2
AO 3
LOW
4
BO 5
BO 6
B 7
VSS 8
7272-112912-1
FIGURE 2
LSI
LSI
LS7272-20
A 1
VSS 2
AO 3
AO 4
n.c. 5
BO 6
BO 7
n.c. 8
B
9
20 VDD
19 D
18 n.c.
17 DO
16 DO
15 ENA
14 CO
13 CO
12 VSS
11 C
A 1
VSS 2
AO 3
AO 4
n.c. 5
BO 6
BO 7
n.c. 8
B
9
20 VDD
19 D
18 n.c.
17 DO
16 DO
15 ENA
14 CO
13 CO
12 VSS
11 C
LS7273-20
n.c. 10
n.c. 10
FIGURE 3
NOTE: LS7272-20 does not have OPD pin.
FIGURE 4
INPUT / OUTPUT DESCRIPTION:
A/B/ C/D
These are CMOS / TTL data inputs that can also operate with input levels up to the V
DD
power supply. All data input blocks contain hysteresis.
AO / BO / CO / DO / AO / BO / CO / DO
These outputs can be selected to be push-pull or open-drain using the OPD input pin (LS7272 only). When in push-pull mode, outputs switch
between V
DD
and V
SS
(Ground).
ENA
A logic low on this CMOS / TTL compatible input enables the output drivers while logic high forces them into a high-impedance state. This input is
also used to enable / disable the output short circuit thermal protection.
Applying a voltage between 7.5V and 12.5V to the ENA input will disable the thermal shutdown protection function. When using this feature, the Line
Driver Outputs are enabled but no longer protected.
OPD
(LS7272 only)
A logic low on this connects the outputs as open-drain drivers. If this input is left floating, the outputs are connected as push-pull drivers.
LOW
(LS7273 only)
This pin must be tied low.
7272-112912-2
ELECTRICAL CHARACTERISTICS
(VDD = 12V, TA = 25°C, unless otherwise specified)
Parameter
Inputs:
Data Input High-Threshold
Data Input Low Threshold
Data Input Hysteresis
ENA / OPD Input High-Threshold
ENA / OPD Input Low-Threshold
ENA / OPD Input Hysteresis
Inputs:
Leakage Current
ENA
OPD, LOW
Outputs:
High-Level Output Voltage
(LS7272 only)
Symbol
Min
Typ
Max
Unit
Conditions
V
DH
V
DL
V
DHY
V
EH
V
EL
V
EHY
-
0.8
-
-
0.8
-
1.7
1.2
0.5
1.7
1.2
0.5
2.4
-
-
2.4
-
-
V
V
V
V
V
V
ENA
≤
0.8V
ENA
≤
0.8V
ENA
≤
0.8V
-
-
-
I
LKG
I
ESO
I
DSI
-5
-
100
-30
+5
μA
μA
ENA = 12V
OPD , LOW= 0V
-
μA
V
OH
V
OH
V
DD
– 0.4
V
DD
– 0.6
-
-
-
20
0.3
0.4
-
-
-
-
V
V
Ω
V
V
I
LOAD
= 20mA, V
DD
= 4.75V
I
LOAD
= 30mA, V
DD
= 30V
I
LOAD
= 30mA
I
LOAD
= -20mA, V
DD
= 4.75V
I
LOAD
= -30mA, V
DD
= 30V
Output Resistance
Low Voltage Output Voltage
R
DSON
V
OL
V
OL
High-Impedance Output
Leakage Current (Outputs Disabled)
Reset:
Power-On-Reset (POR)
POR Hysteresis
POR Removal Time
Over-Temperature Protection:
Junction Temperature Operate Point
Junction Temperature Release Point
ENA Input Protection Inhibit
T
JTO
T
JTR
V
EPI
-
7.0
165
135
12.5
°C
°C
V
V
POR
V
PORH
T
PORR
-
-
3.6
0.1
5
2.4
-
-
V
V
μS
-
-
-
I
OT
-10
+10
μA
V
DD
= 20V, 2.4V < ENA < 7.5V
NOTE:
ENA input disables Outputs between 2.4V and 7.5V. ENA input enables Outputs between 7.5V and 12V but
disables Temperature Shutdown. ENA input disables Outputs above 12V.
7272-112912-5
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