W91580 Datasheet, PDF (3/19 Pages) Winbond – 24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND HOLD FUNCTIONS

W91580 SERIES
Pin Description, continued
SYMBOL 22-PIN 24-PIN 28-PIN I/O
FUNCTION
MODE
15
17
19
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, M/B = 2:3).
Leaving mode pin floating places the dialer in
pulse mode (10 ppS, M/B = 1:2).
HKS
12
14
16
I Hook switch input.
HKS = 1: On-hook state. Chip in sleep mode, no
operation.
HKS = 0: Off-hook state. Chip enabled for normal
operation.
HKS pin is pulled to VDD by internal resistor.
DP /C9
13
15
17 O N-channel open drain dialing pulse output
(see Figure 1).
Flash key causes DP to go active when in pulse
mode and tone mode.
NC
17
19
22
- No connection.
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
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 16, 8 18, 8 20, 10 I Power input pins.
Publication Release Date: Auguest 1995
-3-
Revision A3