HT9201A Ver la hoja de datos (PDF) - Holtek Semiconductor
Número de pieza
componentes Descripción
Fabricante
HT9201A Datasheet PDF : 7 Pages
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HT9201A/B
Pin Name
I/O
Internal
Connection
Description
The system oscillator consists of an inverter, a bias resistor
X1
I
and the necessary load capacitor on chip. Connecting a
OSCILLATOR
standard 3.579545MHz crystal or ceramic resonator to the X1
and X2 terminals can implement the oscillator function. The
X2
O
oscillator is turned off in the standby mode, and is actuated
whenever a keyboard entry is detected.
XMUTE
XMUTE is an NMOS open drain structure pulled to VSS
O
NMOS OUT
during dialing signal transmission. Otherwise, it is an open
circuit. XMUTE is used to mute the speech circuit when
transmitting the dial signal.
MUTE
The output is low when no keypad input is entered and it
O CMOS OUT becomes high during dialing sequence. The timing diagram is
shown in the operation timing.
FLASH
This pin is a CMOS output structure from which the chip
O CMOS OUT receives the flash key (F1~F4) signals to break the telephone
line for a flash time.
TEST
I
CMOS IN
Pull-High
For IC chip test only
VDD
I
—
Positive power supply, 2.0V~5.5V for normal operation
VSS
I
—
Negative power supply
Approximate internal connection circuits
Absolute Maximum Ratings*
Supply Voltage ............................... –0.3V to 6V
Input Voltage ............... VSS–0.3V to VDD+0.3V
Storage Temperature ............... –50°C to 125°C
Operating Temperature ............. –20°C to 75°C
*Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
3
3rd Dec ’97
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