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Holtek
Holtek

HT-12F Datasheet

2 12 Series of Decoders


HT-12F Datasheet Preview


om 12
t4U.c 2 Series of DecodersFeatures
e· Operating voltage: 2.4V~12V
e· Low power and high noise immunity CMOS
htechnology
S· Low standby current
ta· Capable of decoding 12 bits of information
a· Pair with Holtek¢s 212 series of encoders
.D · Binary address setting
· Received codes are checked 3 times
ww Applications
w · Burglar alarm system
m· Smoke and fire alarm system
o· Garage door controllers
· Car door controllers
.cGeneral Description
UThe 212 decoders are a series of CMOS LSIs for
remote control system applications. They are
t4paired with Holtek¢s 212 series of encoders (re-
fer to the encoder/decoder cross reference ta-
ble). For proper operation, a pair of
eencoder/decoder with the same number of ad-
dresses and data format should be chosen.
eThe decoders receive serial addresses and data
hfrom a programmed 212 series of encoders that
are transmitted by a carrier using an RF or an
SIR transmission medium. They compare the se-
rial input data three times continuously with
· 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
· Car alarm system
· Security system
· Cordless telephones
· Other remote control systems
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.
taSelection Table
aFunction Address
.DPart No.
No.
HT12D
8
HT12F
12
Data
No. Type
4L
0¾
VT Oscillator
Trigger
Package
Ö RC oscillator DIN active ²Hi² 18 DIP/20 SOP
Ö RC oscillator DIN active ²Hi² 18 DIP/20 SOP
wNotes: Data type: L stands for latch type data output.
wVT can be used as a momentary data output.
w www.DataSheet4U.com1 July 12, 1999
Page 1

Block Diagram
O SC2 O SC1
O s c illa to r
D iv id e r
D IN B u ffe r
D a ta D e te c to r
S y n c . D e te c to r
C o m p a ra to r
212 Series of Decoders
D a ta S h ift
R e g is te r
L a tc h C ir c u it
D a ta
C o m p a ra to r
C o n tr o l L o g ic
T r a n s m is s io n G a te C ir c u it
B u ffe r
VT
A d d re s s
VDD VSS
Note: The address/data pins are available in various combinations (see the address/data table).
Pin Assignment
8 -A d d re s s
4 -D a ta
A0 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
VSS 9
18
17
16
15
14
13
12
11
10
H T12D
1 8 D IP
VDD
VT
O SC1
O SC2
D IN
D 11
D 10
D9
D8
8 -A d d re s s
4 -D a ta
NC 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
V S S 10
20
19
18
17
16
15
14
13
12
11
H T12D
20 S O P
NC
VDD
VT
O SC1
O SC2
D IN
D 11
D 10
D9
D8
1 2 -A d d re s s
0 -D a ta
A0 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
VSS 9
18
17
16
15
14
13
12
11
10
H T12F
1 8 D IP
VDD
VT
O SC1
O SC2
D IN
A 11
A 10
A9
A8
1 2 -A d d re s s
0 -D a ta
NC 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
V S S 10
20
19
18
17
16
15
14
13
12
11
H T12F
20 S O P
NC
VDD
VT
O SC1
O SC2
D IN
A 11
A 10
A9
A8
2 July 12, 1999
Page 2

212 Series of Decoders
Pin Description
Pin Name I/O
Internal
Connection
Description
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
¾ Negative power supply (GND)
VDD
I
¾ Positive power supply
Approximate internal connection circuits
NM OS
T R A N S M IS S IO N
G ATE
CM OS OUT
C M O S IN
O S C IL L A T O R
EN
O SC1
O SC2
Absolute Maximum Ratings
Supply Voltage...............................-0.3V to 13V
Input Voltage....................VSS-0.3 to VDD+0.3V
Storage Temperature.................-50°C to 125°C
Operating Temperature ..............-20°C to 75°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-
mum Ratings² 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.
3 July 12, 1999
Page 3

212 Series of Decoders
Electrical Characteristics
Symbol
Parameter
VDD
Operating Voltage
Test Conditions
VDD Conditions
¾¾
ISTB
Standby Current
5V
Oscillator stops
12V
IDD Operating Current
Data Output Source
Current (D8~D11)
IO
Data Output Sink
Current (D8~D11)
5V
No load
fOSC=150kHz
5V VOH=4.5V
5V VOL=0.5V
IVT
VT Output Source Current
VOH=4.5V
5V
VT Output Sink Current
VOL=0.5V
VIH ²H² Input Voltage
5V ¾
VIL ²L² Input Voltage
5V ¾
fOSC
Oscillator Frequency
5V ROSC=51kW
Ta=25°C
Min. Typ. Max. Unit
2.4 5 12 V
¾ 0.1 1 mA
¾2
4 mA
¾ 200 400 mA
-1 -1.6 ¾ mA
1 1.6 ¾ mA
-1 -1.6 ¾ mA
1 1.6 ¾ mA
3.5 ¾
5
V
0¾1
V
¾ 150 ¾ kHz
4 July 12, 1999
Page 4
Part Number HT-12F
Manufactur Holtek
Description 2 12 Series of Decoders
Total Page 9 Pages
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