W91472N Datasheet PDF - Winbond


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W91472N
Winbond

Part Number W91472N
Description 6-MEMORY TONE/PULSE DIALER
Page 14 Pages

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W91472N SERIES
6-MEMORY TONE/PULSE DIALER WITH
SAVE AND HANDFREE FUNCTIONS
GENERAL DESCRIPTION
The W91472N series are tone/pulse switchable telephone dialers with five memories, save memory,
and handfree dialing control. These chips are fabricated using Winbond's high-performance CMOS
technology and thus offer good performance in low-voltage and low-power operations.
FEATURES
DTMF/pulse switchable dialer
Two by 32 digit redial and save memory
Five by 16 digit one-touch direct repertory memory
Pulse-to-tone (*/T) keypad for long distance call operation
Cascaded dialing
Uses 5 × 6 keyboard
Easy operation with redial, flash, pause, and */T keypads
Pause, PT (pulse-to-tone) can be stored as a digit in memory
Dialing rate (10 ppS or 20 ppS) selectable by bonding option
On-hook debounce time: 150 mS
Minimum tone output duration: 93 mS
Minimum intertone pause: 93 mS
Pause time: 3.6 sec.
Flash break time (73 mS, 100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0S
Make/break ratio (40:60 or 33.3:66.7) selectable by MODE pin
On-chip power-on reset
Uses 3.579545 MHz crystal or ceramic resonator
18 or 20-pin dual-in-line plastic package
The different dialers in the W91472N series are shown in the following table:
TYPE NO.
REPLACEMENT
TYPE NO.
PULSE
(ppS)
FLASH
(mS)
M/B KEY HANDFREE PACKAGE
TONE
DIALING
(PINS)
W91472N
W91472
10 600/300/73/100 Pin
-
-
18
W91472AN W91472A
10 600/300/73/100 Pin
Yes
Yes
20
W91472BN W91472B
20 600/300/73/100 Pin
-
-
18
W91472CN W91472C
20 600/300/73/100 Pin
Yes
Yes
20
Publication Release Date: May 1997
- 1 - Revision A2



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PIN CONFIGURATIONS
W91472N SERIES
C1
C2
C3
C4
C5
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/C6
10 HKS
W91472N/472BN
C1
C2
C3
C4
C5
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/C6
12 HKS
11 HFO
W91472AN/472CN
PIN DESCRIPTION
SYMBOL 18-PIN
Column-
Row Inputs
15
&
1518
XT 7
XT
T/P MUTE
8
9
20-PIN
15
&
1720
7
8
9
I/O FUNCTION
I The keyboard input is compatible with a standard 5 x 6
keyboard, an inexpensive single contact (Form A)
keyboard, and electronic input.
In normal operation, any single button can be pushed to
produce dual tone, pulses, or function. Activation of two
or more buttons will result in no response except for
single tone.
I A built-in inverter provides oscillation with an
inexpensive 3.579545 MHz crystal. The oscillator
ceases when a keypad input is not sensed. The crystal
frequency deviation is 0.02%.
O Crystal oscillator output pin.
O The T/P MUTE is a conventional CMOS N-channel
open drain output.
The output transistor is switched on low level during
dialing sequence (both pulse and tone mode).
Otherwise, it is switched off.
-2-



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W91472N SERIES
Pin Description, continued
SYMBOL 18-PIN
MODE
13
HKS
10
DP / C6
11
DTMF
12
20-PIN
15
12
13
14
I/O FUNCTION
I Pulling mode pin to VSS places dialer in tone mode.
Pulling mode pin to VDD places dialer in pulse mode
with M/B ratio of 40:60 (10 ppS, except for
91472BN/472CN = 20 ppS).
Leaving mode pin floating places dialer in pulse mode
with M/B ratio of 33.3:66.7 (10 ppS, except for
W91472BN/472CN = 20 ppS).
I The HKS input is used to sense whether the handset is
on-hook or off-hook.
In on-hook state, HKS = 1: chip is in sleeping mode, no
operation.
In off-hook state, HKS = 0: chip is enabled for normal
operation.
HKS pin is pulled to VDD by internal resistor.
O N-channel open drain dialing pulse output.
Flash key will cause DP to be active in either tone mode
or pulse mode.
The timing diagram for pulse mode is shown in Figure 1
(a, b, c, d).
O During pulse dialing, this pin remains in low state
regardless of keypad input. In the tone mode, it will
output a dual or single tone.
A detailed timing diagram for tone mode is shown in
Figure 2 (a, b, c, d).
OUTPUT FREQUENCY
Specified
Actual
Error %
R1 697 699 +0.28
R2 770 766 -0.52
R3 852 848 -0.47
R4 941 948 +0.74
C1
1209
1216
+0.57
C2
1336
1332
-0.30
C3
1477
1472
-0.34
VDD, VSS
14, 6
16, 6
I Power input pins for the dialer chip. VDD is the main
power and VSS is the ground.
Publication Release Date: May 1997
- 3 - Revision A2



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W91472N SERIES
Pin Description, continued
SYMBOL 18-PIN
HFI ,
HFO
-
20-PIN
10, 11
I/O FUNCTION
I, O Handfree control pins.
A low pulse on the HFI input pin toggles the handfree
control state.
Status of the handfree control state is listed in the
following table:
CURRENT STATE
HOOK SW.
HFO
INPUT
NEXT STATE
HFO DIALING
-
On Hook
Off Hook
On Hook
Low
High
High
-
HFI
HFI
HFI
Off Hook
High
Low
Low
Low
Yes
No
Yes
Yes
Off Hook
Low On Hook Low
No
Off Hook
High On Hook High
Yes
HFI pin is pulled to VDD by an internal resistor.
Detailed timing diagram is shown in Figure 3.
BLOCK DIAGRAM
HKS
HFI
XT XT
SYSTEM CLOCK
GENERATOR
ROW
(R1 to R4, Vx)
COLUMN
(C1 to C5)
KEYBOARD
INTERFACE
DTMF
D/A
CONVERTER
READ/WRITE
COUNTER
CONTROL
LOGIC
LOCATION
LATCH
RAM
PULSE
CONTROL
LOGIC
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
MODE
T/P MUTE
DP/C6
HFO
-4-




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