MC145406P 데이터 시트보기 (PDF) - Motorola => Freescale

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MC145406P

Driver/Receiver EIA 232-E and CCITT V.28 (Formerly RS-232-D)

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order this document

by MC145406/D

Driver/Receiver

EIA 232–E and CCITT V.28 (Formerly RS–232–D)

The MC145406 is a silicon–gate CMOS IC that combines three drivers

and three receivers to fulfill the electrical specifications of standards

EIA 232–E and CCITT V.28. The drivers feature true TTL input

compatibility, slew–rate–limited output, 300–Ω power–off source imped-

ance, 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 aids reception of noisy signals. By combining

both drivers and receivers in a single CMOS chip, the MC145406 provides

efficient, low–power solutions for EIA 232–E and V.28 applications.

Drivers

• ± 5 V to ±12 V Supply Range

• 300–Ω Power–Off Source Impedance

• Output Current Limiting

• TTL Compatible

• Maximum Slew Rate = 30 V/µs

Receivers

• ± 25 V Input Voltage Range When VDD = 12 V, VSS = – 12 V

• 3 to 7 kΩ Input Impedance

• Hysteresis on Input Switchpoint

MC145406

16

1

16

1

P SUFFIX

PLASTIC

CASE 648

DW SUFFIX

SOG

CASE 751G

SD SUFFIX

SSOP

CASE 940B

BLOCK DIAGRAM

VDD

RECEIVER

VDD

*

VCC

15 kΩ

Rx

+

–

5.4 k

VSS

VCC

DO

1.0 V

1.8 V

HYSTERESIS

VDD

DRIVER

VCC

300 Ω

Tx

LEVEL

SHIFT

+

DI

– 1.4 V

PIN ASSIGNMENT

VDD 1

16 VCC

Rx1 2 R

15

DO1

3

Tx1

D 14 DI1

Rx2 4 R

13 DO2

Tx2 5

D 12 DI2

6

Rx3

7

Tx3

R

11 DO3

D 10 DI3

VSS 8

9 GND

D = DRIVER

R = RECEIVER

VSS

*Protection circuit

M© OMoTtoOroRla,OInLc.A1995

REV 4

1/95

MC145406

1

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