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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document by MC145403/D
MC145403 Drivers/Receivers MC145404 MC145405 MC145408
EIA–232–E and CCITT V.28
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 supply 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: 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 ± 25 V Input Range 3 to 7 kΩ Input Impedance 0.8 V of Hysteresis for Enhanced Noise Immunity TTL and CMOS Compatible Outputs
24 24 1
20 1
P SUFFIX PLASTIC DIP CASE 738
P SUFFIX PLASTIC DIP CASE 724
Receivers
20 1
DW SUFFIX SOG PACKAGE CASE 751D
Available Driver/Receiver Combinations
Device MC145403 MC145404 MC145405 MC145408 Drivers 3 4 5 5 Receivers 5 4 3 5 Figure 1 2 3 4 No. of Pins 20 20 20 24
DW SUFFIX SOG PACKAGE CASE 751E
1
20 1
SD SUFFIX SSOP CASE 940B
Alternative EIA–232 devices to consider are: Three Supply MC145406 (3 x 3) Single Supply MC145407 (3 x 3) MC145705 (2 x 3) with Power Down MC145706 (3 x 2) with Power Down MC145707 (3 x 3) with Power Down
ORDERING INFORMATION
MC145403P MC145404P MC145405P MC145408P MC145403DW MC145404DW MC145405DW MC145408DW MC145405SD Plastic DIP Plastic DIP Plastic DIP Plastic DIP SOG Package SOG Package SOG Package SOG Package SSOP
REV 2 1/97 TN97010600
© Motorola, Inc. 1997 MOTOROLA
MC145403•MC145404•MC145405•MC145408 1
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PIN ASSIGNMENTS (DIP, SOG, AND SSOP) MC145403 3 DRIVERS/5 RECEIVERS
VDD Rx1 Tx1 Rx2 Rx3 Tx2 Rx4 Rx5 Tx3 VSS 1 2 3 4 5 6 7 8 9 10 20 V CC R D R R D R R D 19 18 17 16 15 14 13 12 11 DO1 DI1 DO2 DO3 DI2 DO4 DO5 DI3 GND
MC145404 4 DRIVERS/4 RECEIVERS
VDD Rx1 Tx1 Rx2 Tx2 Rx3 Tx3 Rx4 Tx4 VSS 1 2 3 4 5 6 7 8 9 10 20 V CC R D R D R D R D 19 18 17 16 15 14 13 12 11 DO1 DI1 DO2 DI3 DO3 DI3 DO4 DI4 GND
MC145405 5 DRIVERS/3 RECEIVERS
VDD Rx1 Tx1 Tx2 Rx2 Tx3 Tx4 Rx3 Tx5 VSS 1 2 3 4 5 6 7 8 9 10 20 V CC R D D R D D R D 19 18 17 16 15 14 13 12 11 DO1 DI1 DI2 DO2 DI3 DI4 DO3 DI5 GND
MC145408 5 DRIVERS/5 RECEIVERS
VDD Rx1 Tx1 Rx2 Tx2 Rx3 Tx3 Rx4 Tx4 Rx5 Tx5 VSS 1 2 3 4 5 6 7 8 9 10 11 12 R D R D R D R D R D 24 V CC 23 22 21 20 19 18 17 16 15 14 13 DO1 DI1 DO2 DI2 DO3 DI3 DO4 DI4 DO5 DI5 GND
FUNCTIONAL DIAGRAM RECEIVER
ESD PROTECTION 15 kΩ Rx 5.4 kΩ VSS 1.0 V 1.8 V VSS + DO – Tx VDD VCC 300 Ω VDD VCC.