SN65LBC179ADG4 Datasheet, PDF (1/18 Pages) Texas Instruments – LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

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SN65LBC179A
SN75LBC179A
SLLS377D – MAY 2000 – REVISED SEPTEMBER 2011
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
Check for Samples: SN65LBC179A, SN75LBC179A
FEATURES
1
•2 High-Speed Low-Power LinBiCMOS™ Circuitry
Designed for Signaling Rates⁽¹⁾ of up to 30
Mbps
• Bus-Pin ESD Protection Exceeds 12 kV HBM
• Very Low Disabled Supply-Current
Requirements . . . 700 μA Max
• Common-Mode Voltage Range of –7 V to 12 V
• Low Supply Current . . .15 mA Max
• Compatible With ANSI Standard TIA/EAI-485-A
and ISO8482: 1987(E)
• Positive and Negative Output Current Limiting
• Driver Thermal Shutdown Protection
(1)_{Signaling rate by TIA/EIA-485-A definition restrict transition times}
to 30% of the bit length, and much higher signaling rates may be
achieved without this requirement as displayed in the TYPICAL
CHARACTERISTICS of this device.
SN65LBC179AD (Marked as BL179A)
SN65LBC179AP (Marked as 65LBC179A)
SN75LBC179AD (Marked as LB179A)
SN75LBC179AP (Marked as 75LBC179A)
(TOP VIEW)
V_CC 1
R2
D3
GND 4
8A
7B
6Z
5Y
LOGIC DIAGRAM (POSITIVE LOGIC)
2
R
8
A
7
B
3
D
5
Y
6
Z
DESCRIPTION
The SN65LBC179A and SN75LBC179A 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 are compatible with ANSI standard
TIA/EIA-485-A and ISO 8482:1987(E). The A version offers improved switching performance over its
predecessors without sacrificing significantly more power.
The SN65LBC179A and SN75LBC179A combine a differential line driver and differential input line receiver and
operate from a single 5-V supply. The driver differential outputs and the receiver differential inputs are connected
to separate terminals for full-duplex operation and are designed to present minimum loading to the bus when
powered off (V_CC = 0). These parts feature a wide positive and negative common-mode voltage range making
them suitable for point-to-point or multipoint data bus applications. The devices also provide positive- and
negative-current limiting and thermal shutdown for protection from line fault conditions.
The SN65LBC179A is characterized over the industrial temperature range of –40°C to 85°C. The SN75LBC179A
is characterized for operation over the commercial temperature range of 0°C to 70°C.
INPUT
D
H
L
OPEN
DRIVER
OUTPUTS
Y
H
L
H
FUNCTION TABLE⁽¹⁾
RECEIVER
DIFFERENTIAL INPUTS
A–B
Z
V_ID ≥ 0.2 V
L
-0.2 V < V_ID < 0.2 V
H
V_ID ≤ -0.2 V
L
Open circuit
(1) H = high level, L = low level, ? = indeterminate
OUTPUT
R
H
?
L
H
1
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.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2011, Texas Instruments Incorporated