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W9145 Datasheet(PDF) 3 Page - Winbond

No. de pieza W9145
Descripción Electrónicos  15-MEMORY TONE/PULSE DIALER WITH LOCK AND HANDFREE FUNCTION
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Fabricante Electrónico  WINBOND [Winbond]
Página de inicio  http://www.winbond.com
Logo WINBOND - Winbond

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W9145 SERIES
Publication Release Date: August 1996
- 3 -
Revision A4
SYMBOL
22-PIN
24-PIN
I/O
FUNCTION
Column-
Row
Inputs
1
−4
&
18
−22
1
−4
&
20
−24
I
Keyboard inputs may be connected to either a standard
keyboard, an inexpensive signal contact (Form A)
keyboard, or electronic input from a
µC. A valid key entry
is defined by a single row being connected to a single
column.
XT, XT
6, 7
6, 7
I, O
A built-in inverter provides oscillation by means of an
inexpensive 3.579545 MHz crystal or ceramic resonator.
T/P
MUTE
8
8
O
The T/P MUTE is a conventional CMOS inverter that
pulls to VDD in the absence of keypad input and pulls to
VSS when an address keypad entry is sensed (excluding
the * and # keypads in pulse mode). When any keypad in
row 5 and column 5 is pushed, the mute out remains at
high level.
MODE
14
16
I
Pull to VSS to enable tone mode. Pull to VDD to enable
pulse mode (10 ppS).
HKS
9
9
I
Hook switch input. When pulled to high, chip is in on-hook
state (no operation). When pulled to low, chip is in off-
hook state (enabled for normal operation). This pin is
pulled to VDD by internal resistor.
Note: This pin operates in conjunction with the handfree
control pins; for further information see description of
handfree control pins below.
B/M
16
16
I
B/M = 1: Break/Make ratio is 60:40.
B/M = 0: Break/Make ratio is 67:33.
This pin has no function in tone mode.
VDD, VSS
17, 5
19, 5
I
Power input pins.
X MUTE
13
15
O
The X MUTE is a conventional CMOS inverter that in tone
mode is active while a DTMF signal is being transmitted.
In pulse mode, this output remains low at all times.


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