EM91810A/B
EM91810A/B
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
TONE/PULES SWITCHABLE DIALER WITH LCD INTERFACE
GENERAL DESCRIPTION
The EM91810A/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. EM91810A/B also provide SDO (serial data output) function to drive LCD driver (EM32100, EM32116,
EM32117) and voice synthesizer.
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 DIP20.
SDO function that is supported to drive LCD driver (EM32100) and voice synthesizer to indicate dialing
number.
Key tone function is provided.
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PIN ASSIGNMENTS
EM91810A
C2
C3
C4
C1
OSCI
OSCO
XMUTE
V
SS
SDO
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
KT
C2
C3
C4
C1
OSCI
OSCO
XMUTE
V
SS
HFI
SDO
EM91810B
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
R3
R2
R1
R4
TONE
PO
HKS
V
DD
HFO
KT
* This specification are subject to be changed without notice.
10.1.1997
1
EMC [ ELAN MICROELECTRONICS CORP ]
