Pin Name I/O

Internal

Connection

Description

TE

I

CMOS IN

Pull-high

Transmission enable, active low (see Note)

OSC1

I

OSCILLATOR 1 Oscillator input pin

OSC2

O

OSCILLATOR 1 Oscillator output pin

X1

I

OSCILLATOR 2 455kHz resonator oscillator input

X2

O

OSCILLATOR 2 455kHz resonator oscillator output

VSS

I

¾

Negative power supply, grounds

VDD

I

¾

Positive power supply

Note: D8~D11 are all data input and transmission enable pins of the HT12A.

TE is a transmission enable pin of the HT12E.

Approximate internal connections

Absolute Maximum Ratings

Supply Voltage (HT12A) ..............-0.3V to 5.5V

Supply Voltage (HT12E) ...............-0.3V to 13V

Input Voltage....................VSS-0.3 to VDD+0.3V

Storage Temperature.................-50°Cto125°C

Operating Temperature...............-20°Cto75°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 device

at other conditions beyond those listed in the specification is not implied and prolonged expo-

sure to extreme conditions may affect device reliability.

HT12A/HT12E

NM O S

T R AN SM I S SI O N

GA T E

CM O S I N

Pu l l - h i g h

CM O S O UT

OS C I L L A T OR 1

OS C 2

OS C 1

OS C I L L A T OR 2

X1

X2

EN

NM O S T RA NS M I S S I O N G A T E

P R OT E C T I ON D I O D E

V DD