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DTMF Tone Generator IC : LC7366    

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No.    65    
Kit / Parts     Parts set    
Class.     Accessories   
Part Name     DTMF tone generator LC7366     
Shop    IC manufacturer : SANYO Co.,Ltd.

Parts Shop : Akizuki Denshi Tsusho Ltd.

E-mail : akizuki@ains.tomakomai.or.jp

This Parts Set is got in Japan. At another country, it is very difficult to get this.

Price     500 yen

( 500 yen is about $4.5, One dollar at the time of 110 yen.)    

Main part     LC7366    
The power supply     2.510VDC 16mA    
Outline specification     
Key for the push telephone handsets    :    09, #, A, B, C and D   
Control Output    :    MUTE output , XMIT output   
Oscillation frequency error    :    within ±1%   
Attached parts     :    X'tal 3.579545MHz : 1 piece
Push button SW for the Print circuit board : 12 pieces
OSC output current     :    Vcc 2.5V: VOL=0.5V IOL=0.18mA min
                  VOH=2.0V IOH=0.13mA min

Vcc 10V: VOL=0.5V IOL=0.8mA min
                 VOH=9.5V IOH=0.42mA min


Print Circuit Board    -   
Case     -   
Size     DIP 16pin   
Additional parts     SW diodes (1S1588 1SS252 etc. , General purpose SW diodes) 24 pieces

Resistance 10kohm 8 pieces

Piezoelectricity speaker 1 piece

Universal print circuit board 1 piece

Capacitor 0.1uF  1 piece   

Comment     OSC output current
  • Vcc 2.5V: VOL=0.5V IOL=0.18mA min

VOH=2.0V IOH=0.13mA min

  • Vcc 10V: VOL=0.5V IOL=0.8mA min

VOH=9.5V IOH=0.42mA min


You can read the English Datasheet of this IC by the following procedure. You need Adobe Acrobat Reader installed on your system to read a datasheet.

  1. Type "http://www.semic.sanyo.co.jp/index_e.htm" in the URL/Location Box of your browser.

  2. "Sanyo Semiconductor" Top Page is opened.  (Ref. Fig.1)

sanyo_a.gif (42545 バイト)

Fig.1 Top Page

  1. Move Cursor to "PRODUCT" TAB which is at the lower position of this frame.
    Then "data sheet" box is appeared. (Ref. Fig.1)

  2. Click "data sheet" box. (Ref. Fig.1)

  3. New page is opened. "OK" is displayed to the end of this frame.
    Click this "OK". (Ref. Fig.2)

sanyo_b.gif (29897 バイト)


  1. The "data sheet" frame is opened at the left side. (Ref. Fig.3)

sanyo_c.gif (63008 バイト)


  1. Type "LC7366" in the "Type Num.(keyword location) " Box. (Ref. Fig.3)

  2. Click "SEARCH" button. (Ref. Fig.3)

  3. The result frame is displayed at the right side. (Ref. Fig.4)

lc7366_2.gif (49126 バイト)



  1. If you want to read the English datasheet, Click "2889". (Ref. Fig.4)

  2. The datasheet is displayed at the right side. (Ref. Fig.5)

lc7366_3.gif (60417 バイト)



Modify     -    


Fig.1 Parts Set


Fig.2 Example

Fig.2 is shown the example circuit board of this parts set.   Piezo-ringer KBT-33SB-2T-2 (KYOCERA CORP.) is used instead of the Piezo speaker. This frequency characteristic is not matching the required specification of this IC. But, the PIC DTMF Decoder Kit( Japanese web page) can decode this Piezo-ringer's output sound.

Table 1 is shown the button arrangement on the fig.2. Table2 is shown the current consumption at operating mode. If no button is pushed, the current consumption is about 90 micro amperes at 9.0Vdc.

Table 1 button arrangement
1     2     3    
4     5     6    
7     8     9    
*     0
(A green button)


Table 2 Current consumption at operating mode
Power supply voltage [V]     Current consumption[mA]    
3.0     2.92    
4.0     4.55    
5.0     6.16    
6.0     7.88    
7.0     9.63    
8.0     11.42    
9.0     13.23    

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