7273N-013113-1

 

 

 

FEATURES:

•

Open-drain output drivers for return to power supply independent of VDD

•

•

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:

LS7273N

For SOIC packages: LS7273N-S

For TSSOP packages: LS7273N-TS

DESCRIPTION:

30 VOLT QUAD-CHANNEL DIFFERENTIAL LINE DRIVER

WITH OPEN DRAIN OUTPUTS

Jan 2013

PIN ASSIGNMENT – TOP VIEW

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 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

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 5

μs 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.

 

LS7273N

1

4

5

7

8

2

3

6

A

AO

AO

n.c.

BO

BO

B

VSS

16

15

14

13

12

11

10

9

VDD

D

DO

CO

ENA

DO

CO

C

FIGURE 1