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W91621 Datasheet(PDF) 4 Page - Winbond

Part # W91621
Description  10-MEMORY TONE/PULSE DIALER WITH TWO-STAGE REDIAL FUNCTION
PDF  16 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W91621 Datasheet(HTML) 4 Page - Winbond

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W91620 SERIES
- 4 -
BLOCK DIAGRAM
HKS
MODE
T/P MUTE
COLUMN
ROW
XT
XT
P MUTE
DP/C5
(R1 to R4)
DTMF
SYSTEM CLOCK
GENERATION
READ/WRITE
COUNTER
RAM
LOCATION
LATCH
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
KEYBOARD
INTERFACE
(C1 to C4)
D/A
CONVERTER
PULSE
CONTROL
LOGIC
CONTROL
LOGIC
FUNCTIONAL DESCRIPTION
Keyboard Operation
C1
C2
C3
C4
DP / C5
1
2
3
S
P
→T
R1
4
5
6
F
P
R2
7
8
9
A
R3
*
0
#
R
R4
• S: Store function key
• F: Flash key
• P
→T: In pulse mode, this key works as Pulse→Tone key
• R: Redial function key
• A: Indirect repertory dialing key
• P: Pause key



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