EM91440 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
HKS
2
KEY IN
Tdb
KT
SDO
b2 b3 b4
Tbit
spT
1
b1
1
b5 spT
b0
sT
0
sT
1
0
0
0
0
0
0
M
L
Hi-impedance
<Note>L=LSB,M=MSB, sT=START bit time, spT=STOP bit time
Figure 8. SDO operating timing
HKS
HD
HF
HD
HD
HD
HD
HD
@
HF
HF
KEY IN
HFO
280
ms
Thdrdb
HDO
XMUTE
SDO
PO
MELODY
Hi-impedance
@ : It can be triggled by extension telephone set for hold function release
Figure 9. HF and HD operating timing
HFI
or
HF
HKS
5
0
KEY
KT
Tdly
OSC.
"0" digit dialing time
Hi-impedance
Figure 10. Off-Hook delay time
* This specification are subject to be changed without notice.
10.1.1997
17