becomes a high impedance and is 鈥渞emoved鈥?from the line. In addition, an overriding 鈥淚NHIBIT鈥?/div>
input provides for removal of the Driver output from the line. A logic 鈥?鈥?applied to the 鈥淚NHIBIT鈥?/div>
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 鈥淒ATA鈥?and 鈥淒ATA鈥? 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鈩?pull-up to
+5V is recommended.
eroflex Circuit T
echnology
鈥?Data Bus Modules For The Future 漏 SCDCT3232 REV A 6/27/02