Pin Name

I/O

Internal

Connection

Description

D0~D3

I

CMOS IN

Pull-high

or floating

Data inputs for the parallel mode

When the IC is operating in the serial mode, the data input

terminals (D0~D3) are included with a pull-high resistor. When

the IC is operating in the parallel mode, these pins become

floating.

S/P

I

CMOS IN

Operation mode selection input

S/P=“H”: Parallel mode

S/P=“L”: Serial mode

CLK

I

CMOS IN

Pull-high

or floating

Data synchronous clock input for the serial mode

When the IC is operating in the parallel mode, the input

terminal (CLK) is included with a pull-high resistor. When the

IC is operating in the serial mode, this pin becomes floating.

DATA

I

CMOS IN

Pull-high

or floating

Data input terminal for the serial mode

When the IC is operating in the parallel mode, the input terminal

(DATA) is included with a pull-high resistor. When the IC is

operating in the serial mode, this pin becomes floating.

DTMF

O

CMOS OUT

Output terminal of the DTMF signal

VDD

—

—

Positive power supply, 2.0V~5.5V for normal operation

Approximate internal connection circuits

HT9200A/B