DTMF DIALER FOR BINARY DATA-IN
S5T0167
1
INTRODUCTION
The S5T0167 is a DTMF dialer for 4 bit binary data input from the
microprocessor. When the tone enable input is low, the oscillator is
inhibited and the device is in a low power consumption at standby
mode.On the low to high transition of tone enable, data is latched into
the device and selected the standard DTMF signals.
The N-channel open drain output provides a MUTE output during tone
generation.
FEATURES
Direct interface with microprocessor
Generates 16 standard tones
Uses inexpensive TV crystal or ceramic resonator (3.579545MHz)
Very low total harmonic distortion
Low power standby mode
Binary data inputs with latches
Wide Operating Voltage : 2.5 ~ 8.0V
ORDERING INFORMATION
Device
Package
Operating Temperature
S5T0167X01-D0B0
14
-
DIP
-
300
-
30 to +70
C
S5T0167X01-S0B0
14
-
SOP
-
225B
14
-
DIP
-
300
14
-
SOP
-
225B
S5T0167
DTMF DIALER FOR BINARY DATA-IN
2
BLOCK DIAGRAM
PIN CONFIGURATION
OSC
CONTROL
CIRCUIT
DATA
LATCH &
DECODER
MUTE LOGIC
ROW & COLUMN
TONE COUNTER
D/A
CONVERTER &
MIXING
TONE OUT
MUTE
OSC IN
OSC OUT
TEN
ST
GS
D0
D1
D2
D3
V
DD
V
SS
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
S5T0167
V
DD
TEN
ST
GS
V
SS
OSC IN
OSC OUT
MUTE
TONE OUT
D3
D2
D1
D0
NC
DTMF DIALER FOR BINARY DATA-IN
S5T0167
3
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Pin No
Symbol
Descriptions
1
V
DD
Positive supply input
2
TEN
Tone enable input. An internal pull-up resistor is in a chip. When this pin connects to logic
low, the oscillator is inhibited and the tone generators and output transistor are turned off.
A low to high transition on this pin latches in data from D0 ~ D3, and tone generation
continues until this pin is connected low again.
3
ST
Single tone enable. An internal pull-up resistor is in a chip.
When this pin connects to logic low, the device is in a single tone mode.
For normal operation, connects this pin to V
DD
or open-circuit.
4
GS
Group selection input. This pin is used to select the high group or low group frequency,
when the device is in single tone mode. An internal pull-up resistor is in a chip. When this
pin connects to V
DD
or open, the high group will be generated, and when connects to V
SS
,
the low group will be generated.
5
V
SS
Negative supply input
6
OSC IN
Oscillator input
7
OSC OUT Oscillator output
8
MUTE
N-channel open drain output.
This pin is a logic high state, when the tone enable pin is a high state.
This pin goes a logic low state, when the tone enable pin is a low state.
9, 10,
11, 12
D0, D1,
D2, D3
DATA-INPUTS. These are the inputs for binary-coded data, which is latched in on the
rising edge of the tone enable signal.
13
N.C
No connection.
14
Tone out
This output is the open emitter of a NPN transistor. When an external load resistor is
connected from this pin to V
SS
, the tone generates on the tone enable pin = High.
Characteristic
Symbol
Value
Unit
Supply Voltage
V
DD
9
V
MUTE Voltage
V
I (MUTE)
9
V
Input Voltage
V
I
V
DD
+ 0.3 to V
SS
- 0.3
V
Power Dissipation
P
D
500
mW
Operating Temperature
T
OPR
-
30 to + 70
C
Storage Temperature
T
STG
-
55 to + 125
C
S5T0167
DTMF DIALER FOR BINARY DATA-IN
4
ELECTRICAL CHARACTERISTICS
(V
SS
= 0V, 2V<V
DD
<8V, f
OSC
= 3.579545MHz, Ta = 25
C, unless otherwise noted)
APPLICATION INFORMATION
FUNCTION DESCRIPTION
When tone enable input is low, oscillator is inhibited, being allowed to low power standby mode since transistor
goes to turn off state, so D0 to D3 input data is ignored.
However if tone enable input goes from low to high, input data is latched and tone output is enabled, and it is
correspond to data input. This device is designed with 14 levels, 28 segments in each single-tone. The column tone
is pre-emphasized 2dB than the row tone.
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Operating voltage range
V
DD
-
2.0
-
8.0
V
Operating Current
I
DD
V
DD
= 3.0V, MUTE Open
-
-
1.5
mA
Standby Current
I
SB
R
L
= 10K, D0 to D3 open, V
DD
= 3.0V
-
50
100
A
Input Pull-up resistance
R
I (PULL)
DI0 to DI3, TEN
-
100
-
K
Input Voltage
V
IL
DI0 to DI3, TEN
V
SS
-
0.2V
DD
V
V
IH
0.8V
DD
-
V
DD
V
Output Current (MUTE)
I
OL (MUTE)
V
DD
= 3V, V
O
= 0.5, TEN = LOW
0.5
1.5
-
mA
I
OH (MUTE)
V
DD
= 3V, V
O
= V
DD
, TEN = HIGH
-
1
2
A
Tone Output Level
V
O (TONE)
V
DD
= 3V, R
L
= 5k
, Row Tone
-
14
-
-
11
dBV
Ratio of Column to Row
dB
CR
V
DD
= 3V, R
L
= 5k
1
2
3
dB
THD (Dual Tone)
THD
1MHz Bandwidth, V
DD
= 5V, R
L
= 5k
-
20
-
-
dB
Oscillator Start-up Time
t
ST (OSC)
90% Amplitudes, V
DD
= 3.0V
-
4
-
mS
Data Set-up Time
t
SU (DATA)
V
DD
= 3.0V
200
-
-
nS
Data Hold Time
t
H (DATA)
V
DD
= 3.0V
200
-
-
nS
Data Duration
t
W (DATA)
V
DD
= 3.0V
600
-
-
nS
Table 1. Single Tone Frequency
Tone Group Standard DTMF (Hz) Tone Output Actual Frequency
% Deviation from Standard
ROW 1
ROW 2
ROW 3
ROW 4
COLUMN 1
COLUMN 2
COLUMN 3
COLUMN 4
697
770
852
941
1209
1336
1477
1633
699.13
766.17
845.43
947.97
1215.89
1331.67
1471.85
1645.01
+ 0.31
-
0.50
-
0.54
+ 0.74
+ 0.57
-
0.33
-
0.35
+ 0.75
DTMF DIALER FOR BINARY DATA-IN
S5T0167
5
Table 2. Function Table
Key Board
Data Input
Tone Output
Equivalent
D3
D2
D1
D0
f
L
(Hz)
f
H
(Hz)
1
0
0
0
1
697
1209
2
0
0
1
0
697
1336
3
0
0
1
1
697
1477
4
0
1
0
0
770
1209
5
0
1
0
1
770
1336
6
0
1
1
0
770
1477
7
0
1
1
1
852
1209
8
1
0
0
0
852
1336
9
1
0
0
1
852
1477
0
1
0
1
0
941
1336
*
1
0
1
1
941
1209
#
1
1
0
0
941
1477
A
1
1
0
1
697
1633
B
1
1
1
0
770
1633
C
1
1
1
1
852
1633
D
0
0
0
0
941
1633
S5T0167
DTMF DIALER FOR BINARY DATA-IN
6
NOTES
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