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AM7945JC Datasheet(PDF) 1 Page - Advanced Micro Devices |
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AM7945JC Datasheet(HTML) 1 Page - Advanced Micro Devices |
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1 / 18 page  Publication# 18408 Rev: D Amendment: /0 Issue Date: October 1999 Am7945 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Programmable constant-current feed s Current gain = 200 s Programmable loop-detect threshold s Low power Standby state s Ground-key detector s Tip Open state for ground-start lines s –19 V to –56.5 V battery operation s On-chip Thermal Management (TMG) feature s Two-wire impedance set by single external impedance s On-hook transmission s On-chip ring relay driver and relay snubber circuit s Ideal for low cost PABX and key telephone systems BLOCK DIAGRAM VCC VEE AGND/DGND RSN VTX RD RDC CAS C1 C2 C3 E0 E1 DET Two-Wire Interface HPA HPB DA DB BGND VBAT A(TIP) B(RING) TMG Ground-Key Detector Signal Transmission Off-Hook Detector Power-Feed Controller Ring-Trip Detector RINGOUT Ring Relay Driver Input Decoder and Control |
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