SLLS236G − OCTOBER 1996 − REVISED MARCH 2007
SN65LBC184, SN75LBC184
DIFFERENTIAL TRANSCEIVER
WITH TRANSIENT VOLTAGE SUPPRESSION
description (continued)
A biexponential function defined by separate rise and fall times for voltage and current simulates the
combination wave. The standard 1.2
µs/50 µs
combination waveform is shown in Figure 1 and in the test
description in Figure 15.
The device also includes additional desirable features for party-line data buses in electrically noisy environment
applications including industrial process control. The differential-driver design incorporates slew-rate-controlled
outputs sufficient to transmit data up to 250 kbps. Slew-rate control allows longer unterminated cable runs and
longer stub lengths from the main backbone than possible with uncontrolled and faster voltage transitions. A
unique receiver design provides a fail-safe output of a high level when the inputs are left floating (open circuit).
The SN75LBC184 and SN65LBC184 receiver also includes a high input resistance equivalent to one-fourth unit
load allowing connection of up to 128 similar devices on the bus.
The SN75LBC184 is characterized for operation from 0°C to 70°C. The SN65LBC184 is characterized from
−40°C to 85°C.
schematic of inputs and outputs
VCC
A Port
Only
12
µA
Nominal
72 kΩ
A or B
I/O
16 kΩ
16 kΩ
B Port
Only
12
µA
Nominal
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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TI [ TEXAS INSTRUMENTS ]
