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212

Series of Decoders

Selection Table

Function Address

No.

DataVT Oscillator Trigger Package

Part No. No. Type

HT12D 8 4 L RC oscillator DIN active Hi 18 DIP/20 SOP

HT12F 12 0 RC oscillator DIN active Hi 18 DIP/20 SOP

Notes: Data type: L stands for latch type data output.

VT can be used as a momentary data output.

1 July 12, 1999

General Description

The 212

decoders are a series of CMOS LSIs for

remote control system applications. They are

paired with Holteks 212

series of encoders (re-

fer to the encoder/decoder cross reference ta-

b l e) . F o r p r o p er o p er at i on , a p a ir o f

encoder/decoder with the same number of ad-

dresses and data format should be chosen.

The decoders receive serial addresses and data

from a programmed 212

series of encoders that

are transmitted by a carrier using an RF or an

IR transmission medium. They compare the se-

rial input data three times continuously with

their local addresses. If no error or unmatched

codes are found, the input data codes are de-

coded and then transferred to the output pins.

The VT pin also goes high to indicate a valid

transmission.

The 212

series of decoders are capable of decod-

ing informations that consist of N bits of ad-

dress and 12-N bits of data. Of this series, the

HT12D is arranged to provide 8 address bits

and 4 data bits, and HT12F is used to decode 12

bits of address information.

Features

Operating voltage: 2.4V~12V

Low power and high noise immunity CMOS

technology

Low standby current Capable of decoding 12 bits of information

Pair with Holteks 212

series of encoders

Binary address setting

Received codes are checked 3 times

Address/Data number combination- HT12D: 8 address bits and 4 data bits- HT12F: 12 address bits only

Built-in oscillator needs only 5% resistor Valid transmission indicator

Easy interface with an RF or an infrared

transmission medium

Minimal external components

Applications

Burglar alarm system

Smoke and fire alarm system

Garage door controllers

Car door controllers

Car alarm system

Security system

Cordless telephones

Other remote control systems

Jameco Part Number 123748

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Block Diagram

Note: The address/data pins are available in various combinations (see the address/data table).

Pin Assignment

212

Series of Decoders

2 July 12, 1999

D a t a S h i f tR e g i s t e r

O s c i l l a t o r

B u f f e r

S y n c . D e t e c t o r

D i v i d e r

C o m pa r a to r C o m pa ra to r

B u f f e r T r a n s m i s s i o n G a t e C i r c u i t

D a t a D e t e c t o r

C o n t r o l L o g i c

O S C 1O S C 2

DI N

VD D VS S

VT

D a t a L a t c h C i r c u i t

Add ress

8 - A d d r e s s4 - D a t a

1 2 - A d d r e s s0 - D a t a

A0

A1

A2

A3

A4

A5

A6

A7

VSS

VDD

VT

O S C 1

O S C 2

DI N

D1 1

D1 0

D9

D8

1

2

3

4

5

6

7

8

9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

1 2 - A d d r e s s0 - D a t a

A0

A1

A2

A3

A4

A5

A6

A7

VSS

VDD

VT

O S C 1

O S C 2

DI N

A1 1

A1 0

A9

A8

1

2

3

4

5

6

7

8

9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

1

2

3

4

5

6

7

8

9

1 0

20

1 9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

NC

VDD

VT

O S C 1

O S C 2

DI N

A1 1

A1 0

A9

A8

NC

A0

A1

A2

A3

A4

A5

A6

A7

VSS

8 - A d d r e s s4 - D a t a

1

2

3

4

5

6

7

8

9

1 0

20

1 9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

NC

VDD

VT

O S C 1

O S C 2

DI N

D1 1

D1 0

D9

D8

NC

A0

A1

A2

A3

A4

A5

A6

A7

VSS

H T 1 2 F

2 0 S O P

H T 1 2 F

1 8 D I P

H T 1 2 D

1 8 D I P

H T 1 2 D

2 0 S O P

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Pin Description

Pin Name I/OInternal

ConnectionDescription

A0~A11 I

NMOS

TRANSMISSION

GATE

Input pins for address A0~A11 setting

They can be externally set to VDD or VSS.

D8~D11 O CMOS OUT Output data pins

DIN I CMOS IN Serial data input pin

VT O CMOS OUT Valid transmission, active high

OSC1 I OSCILLATOR Oscillator input pin

OSC2 O OSCILLATOR Oscillator output pin

VSS I Negative power supply (GND)

VDD I Positive power supply

Approximate internal connection circuits

Absolute Maximum Ratings

Supply Voltage...............................-0.3V to 13V Storage Temperature.................-50C to 125C

Input Voltage....................VSS-0.3 to VDD+0.3V Operating Temperature ..............-20C to 75C

Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maxi-mum Ratings may cause substantial damage to the device. Functional operation of this de-vice at other conditions beyond those listed in the specification is not implied and prolonged

exposure to extreme conditions may affect device reliability.

212

Series of Decoders

3 July 12, 1999

N M O S

T R A N S M I S S I O NG A T E

C M O S I NO S C I L L A T O R

O S C 1 O S C 2

C M O S O U T

E N

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Electrical Characteristics Ta=25C

Symbol ParameterTest Conditions

Min. Typ. Max. UnitVDD Conditions

VDD Operating Voltage 2.4 5 12 V

ISTB Standby Current5V

Oscillator stops 0.1 1 mA

12V 2 4 mA

IDD Operating Current 5V No load

fOSC=150kHz 200 400 mA

IO

Data Output Source

Current (D8~D11)5V VOH=4.5V -1 -1.6 mA

Data Output Sink

Current (D8~D11)5V VOL=0.5V 1 1.6 mA

IVTVT Output Source Current

5VVOH=4.5V -1 -1.6 mA

VT Output Sink Current VOL=0.5V 1 1.6 mA

VIH H Input Voltage 5V 3.5 5 V

VIL L Input Voltage 5V 0 1 V

fOSC Oscillator Frequency 5V ROSC=51kW 150 kHz

212

Series of Decoders

4 July 12, 1999

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212

Series of Decoders

5 July 12, 1999

Functional Description

Operation

The 212

series of decoders provides various com-

binations of addresses and data pins in differ-

ent packages so as to pair with the 212

series of

encoders.

The decoders receive data that are transmitted

by an encoder and interpret the first N bits ofcode period as addresses and the last 12-N bits

as data, where N is the address code number. A

signal on the DIN pin activates the oscillator

which in turn decodes the incoming address

and data. The decoders will then check the re-

ceived address three times continuously. If the

received address codes all match the contents of

the decoders local address, the 12-N bits of

data are decoded to activate the output pins

and the VT pin is set high to indicate a valid

transmission. This will last unless the address

code is incorrect or no signal is received.

The output of the VT pin is high only when the

transmission is valid. Otherwise it is always

low.

Output type

Of the 212

series of decoders, the HT12F has no

data output pin but its VT pin can be used as a

momentary data output. The HT12D, on the

other hand, provides 4 latch type data pins

whose data remain unchanged until new data

are received.

Part

No.

Data

Pins

Address

Pins

Output

Type

Operating

Voltage

HT12D 4 8 Latch 2.4V~12V

HT12F 0 12 2.4V~12V

Flowchart

The oscillator is disabled in the standby state

and activated when a logic high signal applies

tothe DIN pin.That isto say, the DIN shouldbe

kept low if there is no signal input.

Yes

C o d e i n ?

S t o r e d a t a

No

Yes

No

No

No

Yes

S t a n d b y m o d e

D i s a b l e V T & i g n o r e t h e r e s t o f

t h i s w o r d

Yes

No

Yes

Add r ess or d a t a e r r o r ?

L a t c h d a t a t o o u t p u t &

a c t i v a t e V T

A d d r e s s b i t sm a t c h e d ?

M a t c hp r e v i o u s s t o r e d

d a t a ?

P o w e r o n

3 t i m e so f c h e ck i n g

c o m p l e t e d ?

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Decoder timing

Encoder/Decoder cross reference table

Decoders

Part No.Data Pins Address Pins VT Pair Encoder

Package

Encoder Decoder

DIP SOP DIP SOP

HT12D 4 8 HT12A 18 20

18 20HT12E 18 20

HT12F 0 12 HT12A 18 20

18 20HT12E 18 20

Address/Data sequence

The following table provides address/data sequence for various models of the 212

series of decoders. A

correct device should be chosen according to the requirements of the individual addresses and data.

Part No.Address/Data Bits

0 1 2 3 4 5 6 7 8 9 10 11

HT12D A0 A1 A2 A3 A4 A5 A6 A7 D8 D9 D10 D11

HT12F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11

212

Series of Decoders

6 July 12, 1999

2 c l o c k s1 4

c h e c k

4 w o r d s 4 w o r d s

E n c o d e r D O U T

T r a n s m i t t e dC o n t i n u o u s l y

< 1 w o r d

E n c o d e r T r a n s m i s s i o n

E n a b l e

c h e c k

D e c o d e r V T

L a t c h e dD a t a O u t

2 c l o c k s1 4

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Oscillator frequency vs supply voltage

The recommended oscillator frequency is fOSCD (decoder) @ 50 fOSCE (HT12E encoder)

@

1

3 fOSCE (HT12A encoder).

212

Series of Decoders

7 July 12, 1999

f o s c( S c a l e )

R o s c (9)

0 . 5 0

( 1 0 0 k H z ) 1 . 0 0

1 . 5 0

2 . 0 0

2 . 5 0

3 . 5 0

4 . 0 0

3 . 0 0

0 . 2 5

2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 V D D ( V D C )

68k

62k

5 6k

5 1 k

47k

43k

39k

36k

33k

30k

27k

75 k

82k

1 0 0 k

1 2 0 k

1 5 0 k

1 8 0 k

2 2 0 k

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Application Circuits

Notes: Typical infrared receiver: PIC-12043T/PIC-12043S (KODESHI CORP.)

or LTM9052 (LITEON CORP.)

Typical RF receiver: JR-200 (JUWA CORP.)

RE-99 (MING MICROSYSTEM, U.S.A.)

212

Series of Decoders

8 July 12, 1999

R e c e i v e r C i r c u i t

HT12D

A 0

A 1

A 2

A 3

A 4

A 5

A 6

A 7

VSS

VD D

VT

O S C 1

O S C 2

D I N

D 1 1

D 1 0

D 9

D 8

1

2

3

4

5

6

7

8

9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

ROSC

VD D

R e c e i v e r C i r c u i t

HT12F

A 0

A 1

A 2

A 3

A 4

A 5

A 6

A 7

VSS

VD D

VT

O S C 1

O S C 2

D I N

A 1 1

A 1 0

A 9

A 8

1

2

3

4

5

6

7

8

9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1 1

1 0

ROSC

VD D

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212

Series of Decoders

9 July 12, 1999

Copyright 1999 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtekassumes no responsibility arising fromthe use of the specifications described. The applications mentionedherein areused solely for the purpose of illustration and Holtek makes no warranty or representation that such applicationswill be suitable without further modification, nor recommends the use of its products for application that may pres-ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without priornotification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

Holtek Semiconductor Inc. (Headquarters)No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.Tel: 886-3-563-1999Fax: 886-3-563-1189

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Tel:021-6485-5560Fax:021-6485-0313

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