MSM6234RS [OKI]
DTMF Tone Dialer LSI; DTMF音频拨号器LSI
| 型号： | MSM6234RS |
| 厂家： | 
OKI ELECTRONIC COMPONETS |
| 描述： | DTMF Tone Dialer LSI |
| 文件： | 总12页 (文件大小：122K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
E2A0022-16-X0
This version: Jan. 1998
Previous version: Nov. 1996
¡ Semiconductor
MSM6234
DTMF Tone Dialer LSI
GENERAL DESCRIPTION
TheMSM6234isatonedialerLSIwhichisfabricatedbyOki'slowpowerconsumptionCMOSsilicon
gate technology.
The MSM6234 can generate 16 DTMF (Dual Tone Multi Frequency) signals which consists of 4 higher
group frequencies and 4 lower group frequencies.
FEATURES
• The standard 2 of 8 keyboard can be used.
• The low power consumption by use of CMOS silicon gate technology.
• Supply voltage 2.5 V to 8.5 V.
• Either single tone or dual tone output.
• 3.579545 MHz crystal oscillation.
• Interface with microcotroller.
• Package:
16-pin plastic DIP
(DIP16-P-300-2.54)
(Product name : MSM6234RS)
1/12
¡ Semiconductor
MSM6234
BLOCK DIAGRAM
3.579545 MHz
OSC I
AKD
MUTE
LOGIC
OSC
1/2
OSC O
VDD
[LOW]
PR
CK
R1
KEY BOARD
LOGIC
(ROW)
PROGRAMMABLE
DIVIDER
160, 146, 132, 118
R2
R3
R4
8 STAGE
COUNTER
LADDER
NETWORK
16fL CK
R
VDD
VDD
SINGLE
TONE
INHIBIT
INHIBIT
LOGIC
VREF
ADDER
VDD
TONE
OUT
R
C1
KEY BOARD
LOGIC
(COLUMN)
PROGRAMMABLE
DIVIDER
92, 84, 76, 68
CK
PR
CK
16fH
C2
C3
C4
8 STAGE
COUNTER
LADDER
NETWORK
[HIGH]
VDD
VSS
VDD
TONE
DISABLE
2/12
¡ Semiconductor
MSM6234
PIN CONFIGURATION (TOP VIEW)
VDD
1
2
16 TONE OUT
TONE
DISABLE
SINGLE TONE
15
INHIBIT
C1 3
C2 4
C3 5
14 R1
13 R2
12 R3
11 R4
10 AKD
9 C4
VSS
6
OSC1 7
OSC0 8
16-Pin Plastic DIP
3/12
¡ Semiconductor
MSM6234
PIN AND FUNCTIONAL DESCRIPTIONS
OSCI, OSCO
The 3.579545 MHz crystal oscillator is connected to these pins.
A feedback resistor and the condensers are incorporated.
OSC
I
C
Crystal
RFB
3.579545
MHz
OSC O
C
MSM6234RS
4/12
¡ Semiconductor
MSM6234
R1, R2, R3, R4, C1, C2, C3, C4
These are input pins of negative logic to be connected to the keyboard.
The standard 2 of 8 keyboard can be used with MSM6234RS as illustrated below.
VDD
R
R1
R2
R3
R4
1
4
7
2
5
8
0
3
6
9
#
A
B
C
D
R
R
R
*
R = 20 kW to 150 kW
R
C4
C3
C2
C1
R
R
R
ROW
COL
VSS
MSM6234RS
2 of 8 keyboard
R1 to R4 are the input pins of the row side, while C1 to C4 are the input pins of the column side. All
the pins are provided with the pull-up resistor of 20 kW to 150 kW internally.
The dual tone is output from the TONE OUT pin, by setting both of a row input and a column input
to the ground voltage.
The Table 1 (See Note) shows the relation between the nominal frequency and the tone output
frequency, whiletheTable2(SeeNote)showstheinputconditionofR1toR4pinsandC1toC4pins.
• Refer to the Table 1 and Table 2
Table-1
Nominal
Frequency
Tone Output
Frequency
Effective Input
Accuracy (%)
Remarks
R1
697 Hz
770 Hz
699.1 Hz
766.2 Hz
847.4 Hz
948.0 Hz
1215.9 Hz
1331.7 Hz
1471.9 Hz
1645.0 Hz
+0.30%
–0.49%
–0.54%
+0.74%
+0.57%
–0.32%
–0.35%
+0.73%
R2
R3
(ROW)
Low Group
852 Hz
R4
C1
941 Hz
1209 Hz
1336 Hz
1477 Hz
1633 Hz
C2
(COLUMN)
High Group
C3
C4
5/12
¡ Semiconductor
MSM6234
Table-2
Row Input
Column Input
Tone Output *
Remarks
Dual tone
No
1
No
1
0 V
fL + fH
Single tone
(Only column)
No
1
fH
1
No
No
0 V
0 V
fH
More than 2
More than 2
No
1
Single tone
Single tone
More than 2
More than 2
More than 2
0 V
fL
1
More than 2
0 V
f : Low Group
L
f : High Group
H
* : The tone output shown is in the case when the load resistance is connected between the TONE
OUT pin and the V .
SS
Sample Interface Circuit with Microcontroller
VDD
MSM4049
R1
R1
R2
R3
R4
C1
R2
R3
R4
C1
C2
C3
C4
C2
C3
C4
1
6
8
D
TONE
OUT
tt
VSS
tid
tt ≥ 50 ms and 30 ms £ tid £ 3 s
Figure 1
6/12
¡ Semiconductor
MSM6234
AKD
The AKD pin drives the external bipolar transistor by its N-channel open drain output.
This pin is open when the key input is off, while it becomes low when the key input is on. AKD is
used for the mute of the transmitter/receiver.
Key input
ON
"L"
OFF
OFF
AKD
Open
Open
AKD
MSM6234RS
TONE DISABLE
This is an input pin to control the output of the TONE OUT pin.
When the input to this pin is high level, the TONE OUT pin normally operates. When the input to
thispinislowlevel, however, theoutputfromtheTONEOUTpinisprohibitedevenifthekeyinput
is on.
AKD is effective at that time. This pin is provided with the pull-up resistance of 50 kW to 200 kW
internally.
key input
TONE DISABLE
AKD
ON
"L"
OFF
OFF
"L"
"H"
Open
Open
"L"
"L"
TONE OUT
VDD
50 kW to 200 kW
TONE DISABLE
MSM6234RS
7/12
¡ Semiconductor
MSM6234
SINGLE TONE INHIBIT
When more than two columns are selected against only one row, or when more than 2 rows are
selected against only one column, the single tone is output from the TONE OUT pin.
ThisSINGLE TONE INHIBITpinisanegativelogicinputpintocontrol theoutputoftheTONEOUT
pin in those cases. Refer to the Table-2.
When the input to this pin is high level, both of the single tone and dual tone are output from the
TONE OUT pin. When the input to this pin is low level, however, the single tone is prohibited to
output from the TONE OUT pin and becomes DC level.
This pin is provided with the pull-up resistor of 50 kW to 200 kW.
VDD
50 kW to 200 kW
Pull up resistor
SINGLE TONE INHIBIT
MSM6234RS
TONE OUT
Thelowgroupfrequencyandthehighgroupfrequencyselectedbythekeyboardaresynthesized
and output from this TONE OUT pin. Because the output form is the NPN open emitter style, the
load resistance must be connected externally. It is same for the case of the single tone output. The
output amplitude of the high group is bigger than that of the low group by 1 to 2 dB.
The distortion of the dual tone is maximum 10%.
VDD
TONE OUT
MSM6234RS
R
VSS
V
, V
DD SS
V
V
is a power supply.
is ground.
DD
SS
8/12
¡ Semiconductor
MSM6234
Sample Output Waveform of the Single Tone
VDD
1.0
15 15 15
14
14
13
13
0.9
0.8
0.7
0.6
12
12
11
11
10
10
9
9
1 2 3 4 5 6 7 8 9 1011 12 1314 15 16 17 18 19 2021 22 23 24 25 26 27 28 29 30 31 32
0.5
0.4
0.3
8
8
7
7
6
6
5
5
0.2
4
4
3
3
0.1
2
2
1
1 1
(VREF)
Time
Figure 2
Tone Amplitude (mV rms)
900
800
700
600
500
400
300
RL = 1 kW
ROW TONE
3
4
5
6
7
8
9
VDD Æ V
Figure 3
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¡ Semiconductor
MSM6234
ABSOLUTE MAXIMUM RATINGS
Parameter
Power Supply Voltage
Storage Temperature
Power Dissipation
Input Voltage
Symbol
VDD
TSTG
PD
Condition
Ta = 25°C
—
Rating
–0.3 to 9.5
Unit
V
–55 to +150
°C
mW
V
Ta = 25°C
—
500
VI
VSS – 0.3 to VDD + 0.3
VSS – 0.3 to VDD + 0.3
Output Voltage
VO
—
V
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
VDD
Condition
Min.
Typ.
5
Max.
Unit
V
Power Supply Voltage
Operating Temperature
—
—
2.5
8.5
Top
–30
—
+70
°C
Ta = –30°C to +70°C
VDD = 2.5 V to 8.5 V
f(XT)
Crystal Frequency
—
3.579545
—
MHz
10/12
¡ Semiconductor
MSM6234
ELECTRICAL CHARACTERISTICS
DC Characteristics
(Ta = –30°C to +70°C)
Parameter
Input High Voltage
Input Low Voltage
Symbol
VIH
Condition
Min.
0.7VDD
VSS
Typ.
—
Max. Unit Applicable Pin
—
—
V
V
C1 to C4, R1 to R4
C1 to C4, R1 to R4
VDD
VIL
—
0.3VDD
Low Level Input
Leakage Current
IIL
VDD = 8.5 V, VIL = 0 V –0.0567
—
–0.425 mA C1 to C4, R1 to R4
mV
rms
"TONE OUT" Output Voltage VOUT
Difference of High/Low
V
DD = 3.0 V, RL = 1 kW
TONE OUT
235
1
—
437
2
dB CR VDD = 3.0 V to 8.5 V
dB
TONE OUT
TONE OUT
1.5
Band Level
Distortion
%
VDD = 3.0 V to 8.5 V
%
—
—
—
—
10
1
DIS
C1 to C4, R1 to R4
STI, TOND*
High Level Input Leakage
Current
IIH VDD 8.5 V, VIH 8.5 V
=
=
mA
Low Level Input
Leakage Current
IIL
VDD = 8.5 V
,
VIL = 0 V –42.5
—
–170
mA
STI, TOND*
Input High Voltage
Input Low Voltage
VIH
VIL
—
—
V
V
STI, TOND*
STI, TOND*
0.7VDD
VSS
—
—
VDD
0.3VDD
VDD = 8.5 V,
No load, Key-OFF
Power Supply Current
(Stand-by)
IDDS
mA
—
—
200
V
DD = 8.5 V,
Power Supply Current
(Operating)
RL = 1 kW,
No load, Key-ON
IDD
mA
—
—
25
VDD = 3 V
,
VOL = 0.5 V
VOL 0.5 V
0.53
2.0
—
1.3
5.3
—
—
—
10
Low Level Output Leakage
Current
IOL
IOFF
trise
mA
mA
ms
AKD
AKD
VDD
=
8.5 V
,
=
"OFF" Leakage Current
VDD = 8.5 V
TONE OUT
Rise Time
VDD = 3.0 V to 8.5 V
TONE OUT
—
3.0
5.0
*: STI Æ SINGLE TONE INHIBIT
TOND Æ TONE DISABLE
11/12
¡ Semiconductor
PACKAGE DIMENSIONS
DIP16-P-300-2.54
MSM6234
(Unit : mm)
Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)
Epoxy resin
42 alloy
Solder plating
5 mm or more
0.99 TYP.
12/12
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