Call Progress Tone Decoder for Telephone
1) No malfunction by voice signal
2) Dual tone detection (350Hz and 440Hz)
3) Wide dynamic range
4) 3.58MHz crystal resonator
Features
The BU8877 and BU8877F are ICs that
detect dial tones from a call progress signal
used in the telephone lines. The ICs detect
dual signals 350Hz(from 345 to 355Hz)and
440Hz(from 435 to 445Hz).
Description
BU8877/F
99W121A
Telephone, Codeless telephone and Facsimile for the U.S.
Applications
SOP16
December, 1999
*1 Derating:8.0mW/˚C for operation above Ta=25˚C
Power supply voltage
Power
dissipation
Operating temperature range
Storage temperature range
VCC
Pd
Topr
Tstg
V
mW
7
800
~
~
-30 +80
-55 +125
*1
Absolute Maximum Ratings (Ta=25˚C)
Parameter Symbol Limits Unit
DIP8
SOP16 300 *2
*2 Derating:3.0mW/˚C for operation above Ta=25˚C
˚C
˚C
BU8877
BU8877F
DIP8
Dimension(Units:mm)
Power supply voltage VDD V2.85 - 5.25
Symbol UnitMin. Typ. Max.
Recommended Operating Conditions (Ta=25˚C)
Parameter