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W91520N Datasheet Preview

W91520N Datasheet

TONE/PULSE DIALER

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W91520N SERIES
TONE/PULSE DIALER WITH HANDFREE
AND HOLD FUNCTIONS
GENERAL DESCRIPTION
The W91520N series are Si-gate CMOS ICs that provide the necessary signals for tone or pulse
dialing. The W91520N series provide one-key redial, handfree dialing, hold, save, and redial
functions.
FEATURES
DTMF/pulse switchable dialer
Two by 32-digit redial and save memory
Pulse-to-tone (*/T) keypad for long distance call operation
Uses 5 × 5 keyboard
Easy operation with redial, flash, pause, and */T keypads
Pause, pulse-to-tone (*/T) can be stored as a digit in memory
On-hook debounce time: 150 mS
Dialing rate (10 ppS, or 20 ppS) selectable by bonding option
Minimum tone output duration: 93 msec.
Minimum intertone pause: 93 msec.
Flash break time (73, 100, 300, 600 msec.) selectable by keypad; pause time is 1.0 sec.
On-chip power-on reset
Uses 3.579545 MHz crystal or ceramic resonator
Packaged in 18 or 20-pin plastic DIP
The different dialers in the W91520N series are shown in the following table:
TYPE NO. REPLACEMENT PULSE
TYPE NO.
(ppS)
FLASH
(mS)
M/B HANDFREE PACKAGE
DIALING
(PINS)
W91520N
W91521N
W91520
W91521
10 600/100/300/73 Pin
20 600/100/300/73 Pin
-
-
18
18
W91520AN
W91521AN
W91520A
W91521A
10 600/100/300/73 Pin
20 600/100/300/73 Pin
Yes
Yes
20
20
Publication Release Date: May 1997
- 1 - Revision A3




Winbond

W91520N Datasheet Preview

W91520N Datasheet

TONE/PULSE DIALER

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PIN CONFIGURATIONS
W91520N SERIES
C1
C2
C3
C4
H/P MUTE
VSS
XT
XT
T/P MUTE
1
2
3
4
5
6
7
8
9
18 R4
17 R3
16 R2
15 R1
14 VDD
13 MODE
12 DTMF
11 DP/C5
10 HKS
W91520N/W91521N
C1
C2
C3
C4
H/P MUTE
VSS
XT
XT
T/P MUTE
HFI
1
2
3
4
5
6
7
8
9
10
20 R4
19 R3
18 R2
17 R1
16 VDD
15 MODE
14 DTMF
13 DP/C5
12 HKS
11 HFO
W91520AN/W91521AN
PIN DESCRIPTION
SYMBOL 18-PIN
Column-
Row
Inputs
14
&
1518
XT, XT
7, 8
T/P MUTE
9
MODE
13
20-PIN I/O
FUNCTION
14
&
1720
The keyboard inputs may be used with either a
I standard 5 × 5 keyboard or an inexpensive single
contact (Form A) keyboard. Electronic input from a µC
can also be used. A valid key-in is defined as a single
row being connected to a single column.
7, 8 I, O A built-in inverter provides oscillation with an
inexpensive 3.579545 MHz crystal or ceramic
resonator.
9 O The T/P MUTE is a conventional CMOS N-channel
open drain output.
The output transistor is switched on during dialing
sequence, one-key redial break, and flash break time.
Otherwise, it is switched off.
15 I Pulling mode pin to VSS places the dialer in tone
mode.
Pulling mode pin to VDD places the dialer in pulse
mode (10 ppS; 20 ppS for W91521N/521AN, M/B =
40:60).
Floating mode pin places the dialer in pulse mode
(10 ppS; 20 ppS for W91521N/521AN, M/B =
33.3:66.7).
-2-


Part Number W91520N
Description TONE/PULSE DIALER
Maker Winbond
Total Page 16 Pages
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