MC145026 Freescale Semiconductor, Inc, MC145026 Datasheet

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MC145026

Manufacturer Part Number
MC145026
Description
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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Freescale Semiconductor
Technical Data
MC145026, MC145027,
MC145028
Encoder and Decoder Pairs
CMOS
1
These devices are designed to be used as
encoder/decoder pairs in remote control applications.
The MC145026 encodes nine lines of information and
serially sends this information upon receipt of a transmit
enable (TE) signal. The nine lines may be encoded with
trinary data (low, high, or open) or binary data (low or
high). The words are transmitted twice per encoding
sequence to increase security.
The MC145027 decoder receives the serial stream and
interprets five of the trinary digits as an address code.
Thus, 243 addresses are possible. If binary data is used at
the encoder, 32 addresses are possible. The remaining
serial information is interpreted as four bits of binary
data. The valid transmission (VT) output goes high on
the MC145027 when two conditions are met. First, two
addresses must be consecutively received (in one
encoding sequence) which both match the local address.
Second, the 4 bits of data must match the last valid data
received. The active VT indicates that the information at
the Data output pins has been updated.
Freescale reserves the right to change the detail specifications as may be required to permit improvements in the design of its
products.
© Freescale Semiconductor, Inc., 2005. All rights reserved.
Introduction
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Electrical Specifications . . . . . . . . . . . . . . . . 4
3 Operating Characteristics . . . . . . . . . . . . . . . 8
4 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . 9
5 MC145027 and MC145028 Timing . . . . . . . . 16
6 Package Dimensions . . . . . . . . . . . . . . . . . . 18
MC145026, MC145027
16
MC145027DW
MC145028DW
1
Plastic DIP
MC145026P
MC145026D
MC145027P
MC145028P
Case 648
P Suffix
Device
MC145028
Ordering Information
16
SOG Package
Case 751G
DW Suffix
1
16
SOG Package
SOG Package
SOG Package
SOG Package
Rev. 4, 1/2005
Case751B
Plastic DIP
Plastic DIP
Plastic DIP
1
Package
D Suffix
MC145026/D

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MC145026 Summary of contents

Page 1

... Introduction These devices are designed to be used as encoder/decoder pairs in remote control applications. The MC145026 encodes nine lines of information and serially sends this information upon receipt of a transmit enable (TE) signal. The nine lines may be encoded with trinary data (low, high, or open) or binary data (low or high) ...

Page 2

... Operating Voltage Range: MC145026 = 2 MC145027, MC145028 = 4 MC145026 ENCODER out A6/ A7/D7 A9/D9 V A8/D8 SS MC145026, MC145027, MC145028 Technical Data, Rev MC145027 DECODERS Figure 1 ...

Page 3

... A6/D6 A7/D7 A8/D8 A9/D9 Figure 2. MC145026 Encoder Block Diagram SEQUENCER CIRCUIT Figure 3. MC145027 Decoder Block Diagram MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor 3-PIN ÷ 4 OSCILLATOR DIVIDER AND ENABLE RING COUNTER AND 1-OF-9 DECODER ...

Page 4

... This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, V the range VSS ≤ ≤ VDD out MC145026, MC145027, MC145028 Technical Data, Rev CONTROL LOGIC ...

Page 5

... I Input Current - TE in (MC145026, Pull-Up Device) I Input Current in R (MC145026), D (MC145027, MC145028 Input Current A5, A6/D6 - A9/D9 (MC145026 (MC145027 (MC145028) C Input Capacitance ( Quiescent Current - MC145026 DD I Quiescent Current - MC145027, MC145028 DD 1 Also see next Electrical Characteristics table for 2.5 V specifications. ...

Page 6

... Dynamic Supply Current - MC145026 kHz Dynamic Supply Current - MC145027, dd MC145028 ( kHz Also see next Electrical Characteristics table for 2.5 V specifications. Table 3. Electrical Characteristics - MC145026 (Voltage Referenced to V Symbol Characteristic V Low-Level Output Voltage OL V High-Level Output Voltage OH V Low-Level Input Voltage ( ...

Page 7

... Also see next Electrical Characteristics table for 2.5 V specifications. Table 5. Switching Characteristics - MC145026 (C Symbol Characteristic Output Transition Time TLH THL f Encoder Clock Frequency osc t TE Pulse Width w MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor 1 , MC145027, and MC145028 (C Guaranteed Limit Figure ...

Page 8

... These pins may be in either of three states (low, high, or open) allowing 19,683 possible codes. The transmit sequence is initiated by a low level on the TE input pin. Upon power-up, the MC145026 can continuously transmit as long as TE remains low (also, the device can transmit two-word sequences by pulsing TE low) ...

Page 9

... These address/data inputs are encoded and the data is sent serially from the encoder via the (Pins 11, 12, and 13) These pins are part of the oscillator section of the encoder (see MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor pin. out Figure 10). Pin Descriptions pin. out ...

Page 10

... VT pin to go high. The local address may be encoded with trinary or binary data Data Outputs (Pins 15, 14, 13, 12) - MC145027 Only These outputs present the binary information that is on encoder inputs A6/D6 through A9/D9. Only binary data is acknowledged; a trinary open at the MC145026 encoder is decoded as a high level (logic 1 Data In (Pin 9) This pin is the serial data input to the decoder ...

Page 11

... The most-negative supply potential. This pin is usually ground Positive Power Supply (Pin 16) The most-positive power supply pin. MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor 4, these pins accept a resistor and capacitor that are used to determine this pin accepts a resistor and capacitor that are used to detect both the ...

Page 12

... min TE ENCODER OSCILLATOR (PIN 12) D out (PIN 15) HIGH VT (PIN 11) DATA OUTPUTS MC145026, MC145027, MC145028 Technical Data, Rev INTERNAL ENABLE should be chosen to be ≥ 2 times R The value for R S current through R is insignificant compared to current through R S ...

Page 13

... ENCODER OSCILLATOR (PIN 12) ENCODED D ENCODED out (PIN 15) “ZERO” ENCODED “OPEN” MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor “ONE” DATA PERIOD Figure 12. Encoder Data Waveforms 500 400 300 200 100 (pF) ON PINS (MC145027); ...

Page 14

... Pin Descriptions NO NO MC145026, MC145027, MC145028 Technical Data, Rev HAS THE TRANSMISSION BEGUN? YES DOES THE 5-BIT NO ADDRESS MATCH THE ADDRESS ADDRESS MISMATCH PINS? YES STORE THE 4-BIT DATA DOES THIS DATA NO MATCH THE PREVIOUSLY DATA MISMATCH STORED DATA? YES ...

Page 15

... NO NO MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor HAS THE TRANSMISSION BEGUN? YES DOES DISABLE VT ON THE THE ADDRESS NO 1ST ADDRESS MATCH THE MISMATCH AND IGNORE ADDRESS THE REST OF PINS? YES IS THIS AT LEAST THE NO 2ND CONSECUTIVE MATCH SINCE VT DISABLE? YES ...

Page 16

... R2/C2 decays to 2/3 V EOT timing edge occurs when R2/C2 decays to 1/3 V decay should go down between the 2/3 and 1/3 V transmission on D resumes. in Verification of the timing described above should ensure a good match between the MC145026 transmitter and the MC145027 and MC145028 receivers R2/C2 MC145026, MC145027, MC145028 Technical Data, Rev ...

Page 17

... Example R/C Values (All Resistors and Capacitors are ± 5%) ′ pF (kHz) R osc 362 10 k 181 MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor V DD 0.1 µF 0.1 µ out ...

Page 18

... PIN 1 INDEX 4.0 B 3.8 5 0.50 X45˚ 0.25 Figure 20. Outline Dimensions for D SUFFIX SOG (SMALL OUTLINE GULL-WING) PACKAGE MC145026, MC145027, MC145028 Technical Data, Rev SEATING -T- PLANE Figure 19. Outline Dimensions for P SUFFIX PLASTIC DIP (DUAL IN-LINE PACKAGE) (Case Outline 648-08, Issue R) 1 ...

Page 19

... B M 10.55 8X 10.05 PIN'S NUMBER 16 1 PIN 1 INDEX 7.6 7.4 5 0.75 ˚ X45 0.25 Figure 21. Outline Dimensions for DW SUFFIX SOG (SMALL OUTLINE GULL-WING) PACKAGE MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor 2.65 A 2.35 0.25 0.10 16X 14X 10.45 1.27 4 10.15 A SEATING T PLANE B 16X 0.1 T 0.32 0.23 1.0 0.4 SECTION A-A (Case Outline 751G-04, Issue D) Package Dimensions ...

Page 20

... Freescale Semiconductor Literature Distribution Center P.O. Box 5405 Denver, Colorado 80217 1-800-441-2447 or 303-675-2140 Fax: 303-675-2150 LDCForFreescaleSemiconductor@hibbertgroup.com MC145026/D Rev. 4 1/2005 Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document ...

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