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AM79R251 Datasheet(PDF) 1 Page - Advanced Micro Devices

Part No. AM79R251
Description  Intelligent Subscriber Line Interface Circuit (ISLIC)
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Maker  AMD [Advanced Micro Devices]
Homepage  http://www.amd.com
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AM79R251 Datasheet(HTML) 1 Page - Advanced Micro Devices

 
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Pub. # 22480
Rev: C
Amendment: /0
Issue Date: December 1999
Intelligent AccessVoice Solutions
Am79R251
Intelligent Subscriber Line Interface Circuit (ISLIC)
DISTINCTIVE CHARACTERISTICS
s Monitor of two-wire interface voltages and
currents supports
— Voice transmission
— Through chip ring generation
— Programmable DC feed characteristics
— Independent of battery
— Current limited
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
— Leakage resistance
— Loop resistance
— Line capacitance
— Bell capacitance
— Foreign voltage sensing
— Power cross and fault detection
s Supports internal and external ringing
— High voltage operation supports long loops
s +5 V and battery supplies
s Dual battery operation for system power saving
— Automatic battery switching
— Intelligent thermal management
s Compatible with inexpensive protection
networks
— Accommodates low tolerance fuse resistors or
PTC thermistors
s Metering capable
— 12 kHz and 16 kHz
— Smooth polarity reversal
s Tip-open state supports ground start signaling
s Integrated test load switches/relay drivers
BLOCK DIAGRAM
Two-Wire
Interface
BGND
VCC
GND
Signal
Transmission
Gain/Level Shift
Longitudinal
Control
Attenuator
Thermal
Management
Control
Fault
Meas
Signal
Conditioning
Switch
Driver
Relay
Drivers
Relay
Driver 1
Input Decoder and
Control Registers
Relay Control
AD
SA
BD
SB
HPB
HPA
TMN
TMP
VBL
VBH
R2
R3
RYE
R1
TMS
VBP
IMT
ILG
VREF
VSAB
VLB
VTX
RSN
CREF
LD
P3
P2
P1


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