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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT9172 데이터시트(PDF) 7 Page - Holtek Semiconductor Inc |
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HT9172 데이터시트(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 13 page  Figure 5. Steering Time Adjustment Circuits DTMF Dialing Matrix DTMF Data Output Table Low Group (Hz) High Group (Hz) Digit OE D3 D2 D1 D0 697 1209 1 H L L L H 697 1336 2 H L L H L 697 1477 3 H L L H H 770 1209 4HLHL L 770 1336 5HLHL H 770 1477 6HLH H L 852 1209 7HLH H H 852 1336 8 H H L L L 852 1477 9 H H L L H 941 1336 0 H H L H L 941 1209 * H H L H H 941 1477 # H H H L L 697 1633 A H H H L H 770 1633 B HHHH L 852 1633 CHHHH H 941 1633 D H L L L L ¾¾ ANY L Z Z Z Z Note: ²Z² High impedance; ²ANY² Any digit HT9172 Rev. 1.00 7 March 30, 2006 1 4 7 * 2 5 8 0 3 6 9 # A B C D R O W 1 R O W 2 R O W 3 R O W 4 C O L 1 C O L 2 C O L 3 C O L 4 R C V D D R T / G T E S T V D D H T 9 1 7 2 (a) Fundamental circuit: tGTP =R ´ C ´ Ln (VDD /(VDD - VTRT)) tGTA =R ´ C ´ Ln (VDD /VTRT) R 1 C V D D R T / G T E S T R 2 D 1 V D D H T 9 1 7 2 (b) tGTP <tGTA : tGTP = (R1 // R2) ´ C ´ Ln (VDD - VTRT)) tGTA =R1 ´ C ´ Ln (VDD /VTRT) R 1 C V D D R T / G T E S T R 2 D 1 V D D H T 9 1 7 2 (c) tGTP >tGTA : tGTP =R1 ´ C ´ Ln (VDD /(VDD - VTRT)) tGTA = (R1 // R2) ´ C ´ Ln (VDD /VTRT) |
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