eroflex Circuit T

Features

DRIVER DESCRIPTION

The CT3232 Driver section accepts complementary TTL Data at the input, and produces a 30

Volt nominal peak-to-peak differential signal across a 140

Ω load at the output. When coupled to the

Data Bus with a 1:1 transformer, isolated on the Data Bus side with two 55.0

Ω fault isolation

resistors, and loaded by two 70

Ω terminations plus additional receivers, the Data Bus signal

produced is 7.2 Volts nominal peak-to-peak.

When both “DATA” and “DATA” inputs are held low or both are held high, the driver output

becomes a high impedance and is “removed” from the line. In addition, an overriding “INHIBIT”

input provides for removal of the Driver output from the line. A logic “1” applied to the “INHIBIT”

takes priority over the condition of the data inputs and disables the Driver. See Driver Logic

Waveforms, Figure 3.

DATA and DATA inputs must be complementary waveforms, of 50% duty cycle average, with no

gate delays between them.

RECEIVER DESCRIPTION

The CT3232 Receiver section accepts Bi-Phase Differential data at the input and produces two

TTL signals at the output. The outputs are “DATA” and “DATA”, and represent positive and negative

excursions (respectively) of the input beyond a predetermined threshold. See Receiver Logic

Waveforms, Figure 2.

The positive and negative thresholds may be internally set by grounding the appropriate pins, or

externally set with resistors. The pre-set internal thresholds will detect Data Bus signals exceeding

1Volt p-p and ignore signals less than 0.5Volt p-p when used with 1:1 transformer (See Figure 4 for

a suitable transformer and typical connection).

A low level at the STROBE input inhibits the DATA and DATA outputs. If unused, a 2K

Ω pull-up to

+5V is recommended.

CT 3232M

For MIL-STD-1553 & Macair

Low Power Driver / Receiver

CIRCUIT TECHNOLOGY

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