MC145026, MC145027, MC145028 Technical Data, Rev. 4

2

Freescale Semiconductor

Introduction

The MC145028 decoder treats all nine trinary digits as an address which allows 19,683 codes. If binary

data is encoded, 512 codes are possible. The VT output goes high on the MC145028 when two addresses

are consecutively received (in one encoding sequence) which both match the local address.

•

Operating Temperature Range: - 40 to + 85

°C

•

Very-Low Standby Current for the Encoder: 300 nA Maximum @ 25

°C

•

Interfaces with RF, Ultrasonic, or Infrared Modulators and Demodulators

•

RC Oscillator, No Crystal Required

•

High External Component Tolerance; Can Use

± 5% Components

•

Internal Power-On Reset Forces All Decoder Outputs Low

•

Operating Voltage Range:

MC145026 = 2.5 to 18 V

MC145027, MC145028 = 4.5 to 18 V

Figure 1. Pin Assignments

MC145026

ENCODER

MC145027

DECODERS

MC145028

DECODERS

A1

A2

A3

A4

A5

A6/D6

A7/D7

TE

A9/D9

A8/D8

A1

A2

A3

A4

A5

D6

D7

D8

D9

VT

A1

A2

A3

A4

A5

A6

A7

A8

A9

VT