EFG71891PD ,DTMF GENERATOR FOR BINARY CODED HEXADECIMAL DATABLOCK DIAGRAM
OSC IN
3J579MH1|
1E:
OSC OUT l
)3an
Low group D/A
Hrgtn group D/ ..
EFS ,2-CHIPS SET FOR FLUORESCENT LAMP STARTEREFSSTARLIGHT-KITApplication Specific Discretes2-CHIPS SET FOR FLUORESCENT LAMP STARTERA.S.D.
EFS2A ,STARLIGHT-KITFEATURESn VERY WIDE TEMPERATURE RANGE:tube ignition from-30to +85 °Cn SINGLE SHOT IGNITION FROM -30 ..
EFS2ACD ,STARLIGHT-KITEFSSTARLIGHT-KITApplication Specific Discretes2-CHIPS SET FOR FLUORESCENT LAMP STARTERA.S.D.
EFS2B ,STARLIGHT-KITEFSSTARLIGHT-KITApplication Specific Discretes2-CHIPS SET FOR FLUORESCENT LAMP STARTERA.S.D.
EFS2BCD ,STARLIGHT-KITFEATURESn VERY WIDE TEMPERATURE RANGE:tube ignition from-30to +85 °Cn SINGLE SHOT IGNITION FROM -30 ..
ENE361D-07A ,Z-TRAP ENE seriesEN E series _ Surge Absorbers
Z-TRAP ENE series Nominal varistor voltage 200 to 470V
I
EFG71891-EFG71891PD
DTMF GENERATOR FOR BINARY CODED HEXADECIMAL DATA
., EFG7189
gi;s7ji',r' §§9§©§E§%§£®R§ E FG71891
DTMF GENERATOR FOR BINARY
CODED HEXADECIMAL DATA
. GENERATES 16 STANDARD DTMF TONE
PAIRS T
l, USES LOW COST 3.579 MHz CRYSTAL
n DIRECT MICROPROCESSOR INTERFACE
" ACCEPTS 4 BIT DATA IN SERIAL OR PARAL-
LEL FORMAT
'' DATA IS STORED DURING TRANSMISSION
PERIOD
" LOW HARMONIC DISTORTION
" HIGH GROUP PRE EMPHASIS
.1 LOW POWER CONSUMPTION IN STANDBY
1: PULL-UP TO v' ON ALL LOGIC INPUTS
Minidip
ORDERING NUMBERS : EFG71891PD (Minidip)
EFG7189PD (DIP14)
PIN CONNECTIONS (T op view)
DESCRIPTION _ v' :1 U Mb MF om
This CMOS circuit is designed specifically to pro- ISA C 2 ci] H
vide, with a minimum number of external compo- NC C 3 12:] A
nents, a low cost DTMF dialer for microprocessor V"" C 4 EFG7189 ll 3 a
controlled telephone sets operating in accordance osc m r
with existing standards.The4bitsidentifyingthefre- E , "’3 C
quency pair to be generated may be supplied via NC L 6 9 D D
either Sconnections between the EFG7189 and the OSC our C 7 " j SA
microprocessor in parallel format or in serial format
through 3 connections linking the EFG7189 to the
microprocessor. This feature eliminates the neces-
sity to simulate keyboard type inputs normally re- v' MF OUT
quired by standard DTMF generators. Input data is . ISA 2, EFG71891 7 H
stored on trailing edge of ISA signal. The tone pair v- 3 f, Cl A
selected by this code is generated while ISA re- . 4 r J
mains low. With ISA high, the oscillator is inhibited V DSC IN D OSC OuT
and the device is in standby mode. SA pin is con-
nected to thile device is outputting any tone pair.
cn 792923 0053372 Ti" cn _ 19
July1993
EFG7189 - EFG71891
BLOCK DIAGRAM
OSC IN -"e---'''----------.----- - 9 -,
3 579 y22l _ Programmable I
. - divndev l
OSC OUT I Co mer I
I t j i i i I i
D "Hr---, s-d i
.. Low group D/A I
1; i', - Jee,, w OUT
A --Hr---, High gvoun D/A l
l i j t I ,
I Counter I
H --ir---t f I
l d, Programmaule Mute l
l thtrstier Iogic r-e- SA
I --"'-------------------r--. .9 _|
PIN DESCRIPTION
No Name Functiownw Description
i 1 V ' Supply Voltage Positive Supply
L 4 V‘ Supply Voltage 0V
' .11 B Logic Input Parallel input for hexadecimal code allowing
10 C Logic Input the selection of 2 frequencies constituting the
9 D Logic Input DTMF signal (see attached table),
12 A Logic Input Serial or Parallel Input for Hexadecimal Code
13 H Serial Input Clock Clock Input for Hexadecimal Code Serial Input
Register on Pin A Furthermore, it allows for
the selection of the serial or parallel operating
mode of this code.
When ISA input goes low, the validated code
o the parallel input code if input H is high.
. the serial input code if input H is low.
2 ISA Logic Input This pin allows for the inhibition of the analog
output MF OUT :
owhen ISA is high, output MF OUT is idle and
connected to V -.
owhen ISA is low, the hexadecimal code is
validated and MF OUT
output is activated.
8 SA Logic Output This pin indicates the state of the analog
output :
- if ISA is low, SA is a low impedance output
at V -.
(rt. ISA is high, SA is a high impedance output.
I 14 MF OUT Analog Output This pin is the DTMF signal output.
'; 5 OSC IN Oscillator Input This pin corresponds to the input of the
inverter of the oscillator.
The nominal frequency of the oscillator is
3.579 MHz.
792923 005333 MIS CI
