W91473 Datasheet, PDF (4/20 Pages) Winbond – 14-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND LOCK FUNCTION

W91473 SERIES
Pin Description, continued
SYMBOL 22-PIN
HPM
MUTE
17
(only for
W91473/D
)
24-PIN
19
(only for
W91473A)
NC
-
-
LOCK
17
(W91473L
/DL)
19
(W91473
AL)
28-PIN
23
8, 22
(W91473
B/C)
22
(W91473
BL/CL)
I/O
FUNCTION
O The HPM MUTE is a conventional
inverter output.
During pulse dialing, flash, hold, and
mercury mute functions, this pin will
output an active high.
It remains in a low state at all other times.
- No connection.
I _{The function of the LOCK pin is shown}
below:
LOCK PIN
FUNCTION
VDD
"0," " 9" dialing inhibited
Floating
VSS
Normal dialing
"0" dialing inhibited
DTMF
14
16
18
O In pulse mode, remains in low state at all
times. In tone mode, outputs a dual or
single tone.
Detailed timing diagram for tone mode is
shown in Figure 2.
OUTPUT FREQUENCY
Specified
R1
697
R2
770
R3
852
R4
941
C1 1209
C2 1336
C3 1477
Actual
699
766
848
948
1216
1332
1472
Error %
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
VDD, VSS
16, 8
1, 8
20, 10
I Power input pins.
-4-