SN65LBC180
RGV−16
D−14
SN75LBC180
N−14
www.ti.com
SLLS174D–FEBRUARY 1994–REVISED FEBRUARY 2005
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
FEATURES
RGV PACKAGE
(TOP VIEW)
D OR N PACKAGE
(TOP VIEW)
•
Designed for High-Speed Multipoint Data
Transmission Over Long Cables
NC
R
RE
VCC
VCC
A
1
2
3
4
5
6
7
14
13
12
11
10
9
•
•
•
Operate With Pulse Durations as Low as 30 ns
Low Supply Current . . . 5 mA Max
16 15 14 13
1
Meet or Exceed the Requirements of ANSI
Standard RS-485 and ISO 8482:1987(E)
NC
R
12
11
10
9
A
B
Z
Y
DE
D
B
Z
2
3
4
RE
DE
GND
GND
Y
•
•
•
3-State Outputs for Party-Line Buses
8
NC
5
6 7 8
Common-Mode Voltage Range of –7 V to 12 V
Thermal Shutdown Protection Prevents
Driver Damage From Bus Contention
NC−No internal connection
Pins 6 and 7 are connected together internally
•
•
Positive and Negative Output Current
Limiting
Pins 13 and 14 are connected together internally
Pin Compatible With the SN75ALS180
Function Tables
DRIVER
DESCRIPTION
INPUT
ENABLE
DE
H
OUTPUTS
D
H
L
Y
H
L
Z
L
H
Z
The SN65LBC180 and SN75LBC180 differential
driver and receiver pairs are monolithic integrated
circuits designed for bidirectional data communication
over long cables that take on the characteristics of
transmission lines. They are balanced, or differential,
voltage mode devices that meet or exceed the
requirements of industry standards ANSI RS-485 and
ISO 8482:1987(E). Both devices are designed using
TI's proprietary LinBiCMOS™ with the low-power
consumption of CMOS and the precision and robust-
ness of bipolar transistors in the same circuit.
H
L
X
Z
RECEIVER
DIFFERENTIAL INPUTS
A−B
ENABLE
OUTPUT
RE
L
L
L
H
L
R
H
?
L
Z
H
V
ID
≥ 0.2 V
−0.2 V < V < 0.2 V
ID
V
≤ − 0.2 V
ID
X
Open circuit
H = high level, L = low level, ? = indeterminate, X = irrelevant,
Z = high impedance (off)
Both the SN65LBC180 and SN75LBC180 combine a
differential line driver and receiver with 3-state out-
puts and operate from a single 5-V supply. The driver
and receiver have active-high and active-low enables,
respectively, which can be externally connected to
function as a direction control. The driver differential
outputs and the receiver differential inputs are con-
nected to separate terminals for full-duplex operation
and are designed to present minimum loading to the
bus whether disabled or powered off (VCC = 0). These
parts feature a wide common-mode voltage range
making them suitable for point-to-point or multipoint
data-bus applications.
logic diagram (positive logic)
4
DE
9
5
3
Y
Z
D
10
RE
12
11
2
A
B
R
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
LinBiCMOS is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 1994–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.