W91590 Datasheet, PDF (5/20 Pages) Winbond – 24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE, HOLD AND LOCK FUNCTIONS

W91590 SERIES
Pin Description, continued
SYMBOL 22-PIN
DRS
-
24-PIN
-
28-PIN
21
I/O
FUNCTION
I Dial rate selection.
This pin is pulled to VDD by an internal
resistor.
DRS
MODE
PIN
TONE/PULSE
VDD
Pulse
1 Floating
Pulse
VSS
Tone
VDD
Pulse
2 Floating
Pulse
VSS
Tone
DIAL
RATE
M/B
10 ppS 2:3
10 ppS 1:2
10 ppS 1:2
20 ppS 1:2
BLOCK DIAGRAM
ROW
(R1 to R5)
KEYBOARD
INTERFACE
COLUNM
(C1 to C8)
DTMF
D/A CONVERTER
HKS
LOCK
MODE
READ/WRITE
COUNTER
RAM
XT
XT
SYSTEM CLOCK
GENERATOR
DRS
HFI
CONTROL
LOGIC
PULSE
CONTROL
LOGIC
KT
T/P MUTE
HPM MUTE
HFO
DP/C9
LOCATION
LATCH
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
Publication Release Date: July 1995
-5-
Revision A3