W91550 WINBOND [Winbond], W91550 Datasheet - Page 3

• Manufacturer Part Number: W91550
• Description: 13-MEMORY TONE/PULSE DIALER WITH LCD AND LOCK FUNCTION
• Manufacturer: WINBOND [Winbond]

PIN DESCRIPTION
HPM MUTE
T/P MUTE
SYMBOL
Column,
XT, XT
KMUTE
MODE
Inputs
HKS
Row
DP
44 49
50 53
54, 55
PIN
40
39
43
56
42
&
1
I, O A built-in inverter provides oscillation with an inexpensive
I/O
O
O
O
O
I
I
I
The keyboard input may be used with either the standard 4
keyboard, an inexpensive single contact (form A) keyboard or
electronic input.
A valid key entry is defined by a single row being connected to a
single column.
3.579545MHz crystal. Most crystals do not vary by more than 0.02%.
The oscillator oscillates in off-hook or handfree mode but oscillation
ceases in on-hook mode or when the handfree mode is released.
The T/P MUTE is a conventional CMOS N-channel open drain
output. The output transistor is switched on during pulse and tone
mode dialing sequences and flash breaks. Otherwise, it is switched
off.
The HPM MUTE is a conventional CMOS inverter output. During
pulse dialing, flash break, hold, and mercury mute functions, this pin
will output an active high. Otherwise, it remains in a low state.
The KMUTE is a CMOS N-channel open drain output. The output
transistor is switched on only during the mute function. Otherwise, it is
switched off.
Pulling mode pin to V
Pulling mode pin to V
Pulse or tone mode can be selected any time.
Hook switch input.
This pin is a CMOS inverter output. The timing diagram is shown as
Figure 1(a), 1(b), 1(c), 1(d). Flash key will cause DP to go active in
either pulse mode or tone mode.
HKS = V
HKS = V
HKS pin is pulled to V
DD
SS
: On-hook state. Chip in sleeping mode, no operation.
: Off-hook state. Chip enable for normal operation.
- 3 -
SS
DD
DD
places the dialer in tone mode.
places the dialer in pulse mode.
by internal resistor.
FUNCTION
Publication Release Date: November 1997
W91550DN SERIES
Revision A3
7