ML145403 ML145405
ML145404 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.28 applications.
These devices offer the following performance features:
• Operating Temperature Range T = –40° to +85°C
A
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
Drivers
Receivers
Figure
No. of Pins
ML145403
ML145404
ML145405
ML145408
3
4
5
5
5
4
3
5
1
2
3
4
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
Single Supply
ML145406 (3 x 3)
ML145407 (3 x 3)
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