EM91710A/B
EM91710A/B
TONE/PULSE SWITCHABLE DIALER
TONE/PULES SWITCHABLE DIALER
GENERAL DESCRIPTION
The EM91710A/B are Tone/Pulse switchable dialer which are fabricated in CMOS technology with wide
operating voltage for both tone and pulse mode, and consumes very low memory retention current in ON-HOOK
state.
FEATURES
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Tone/pulse switchable dialer.
One 32-digit last number redial memory.
Pulse to tone (P→T) is provided for PBX operation.
Flash key is available.
Minimum tone duration is 98ms or 83ms.
Minimum intertone pause is 98ms or 83ms.
Uses 3.579545 MHz crystal or ceramic resonator.
Many options can be selected.
Mode (10 PPS ; 20 PPS ; Tone)
M/B ratio (40 : 60 ; 33 : 66)
Pause time (3.6s)
Flash function (RESET)
P→T pause time (3.6s)
Flash time (600ms; 300ms; 100ms; or 80ms).
Mixed dialing.
Handfree function is provided for speaker phone application.
Power on reset circuit is provided.
Package in DIP18 or DIP16.
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PIN ASSIGNMENTS
EM91710A
C2
C3
C4
C1
OSCI
OSCO
XMUTE
V
SS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R3
R2
R1
R4
TONE
PO
HKS
V
DD
C2
C3
C4
C1
OSCI
OSCO
XMUTE
V
SS
HFI
EM91710B
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
R3
R2
R1
R4
TONE
PO
HKS
V
DD
HFO
* This specification are subject to be changed without notice.
9.30.1997
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EMC [ ELAN MICROELECTRONICS CORP ]
