ML145403
ML145404
ML145405
ML145408
Drivers/Receivers
RS 232/EIA–232–E and CCITT V.28
Legacy Device:
Motorola MC145403, MC145404, MC145405, MC145408
These devices are silicon gate CMOS ICs that combine both the
transmitter and receiver to fulfill the electrical specifications of EIA
Standard 232–E and CCITT V
.28. The drivers feature true TTL input
compatibility, slew rate limiting outputs, 300
Ω
power–off source
impedance, and output typically switching to within 25% of the sup-
ply rails. The receivers can handle up to ± 25 V while presenting 3 to
7 kΩ impedance. Hysteresis in the receivers aid in the reception of
noisy signals. By combining both drivers and receivers in a single
CMOS chip, these devices provide efficient, low–power solutions for
both EIA–232–E and V applications.
.28
These devices offer the following performance features:
• Operating Temperature Range TA = –40° to +85°C
Drivers
• ± 5 to ± 12 V Supply Range
• 300
Ω
Power–Off Source Impedance
• Output Current Limiting
• TTL and CMOS Compatible Inputs
• Driver Slew Rate Range Limited to 30 V/µs Maximum
Receivers
• ± 25 V Input Range
• 3 to 7 kΩ Input Impedance
• 0.8 V of Hysteresis for Enhanced Noise Immunity
• TTL and CMOS Compatible Outputs
Available Driver/Receiver Combinations
Device
ML145403
ML145404
ML145405
ML145408
Drivers
3
4
5
5
Receivers
5
4
3
5
Figure
1
2
3
4
No. of Pins
20
20
20
24
Note:
Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from
ML
to
MLE.
Alternative EIA–232 devices to consider are:
Three Supply
ML145406 (3 x 3)
Single Supply
ML145407 (3 x 3)
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