LS7273N Datasheet, PDF (1/6 Pages) LSI Computer Systems – 30 VOLT QUAD-CHANNEL DIFFERENTIAL LINE DRIVER

LS7273N
30 VOLT QUAD-CHANNEL DIFFERENTIAL LINE DRIVER ^{Jan 2013}
WITH OPEN DRAIN OUTPUTS
FEATURES:
• Open-drain output drivers for return to power supply independent of VDD
• Voltage Range: 4.5V – 30V (VDD – VSS)
• 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
PIN ASSIGNMENT – TOP VIEW
A1
AO 2
AO 3
n.c. 4
BO 5
BO 6
16 VDD
15 D
14 DO
13 DO
12 ENA
11 CO
PART NUMBER ORDERING INFORMATION:
This part is available in three package styles, DIP, SOIC, and TSSOP.
For DIP packages: LS7273N
For SOIC packages: LS7273N-S
For TSSOP packages: LS7273N-TS
B7
VSS 8
10 CO
9C
FIGURE 1
DESCRIPTION:
The LS7273N is a short-circuit proof Quad Differential Industrial Power Line Driver. It can operate
up to 30V and have a selectable thermal shutdown features.
The Data inputs are TTL / CMOS compatible and can also be driven up to the supply voltage VDD.
The ENA input can be used to place all the outputs in a high impedance state.
The outputs are open drain and the loads can be returned to any voltage between 4.5V and 30V
independent of VDD.
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.
7273N-013113-1