Preliminary Data Sheet
September 2001
L7585F Full-Feature, Low-Power SLIC and Switch
Features
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Description
The L7585F Full-Feature, Low-Power Subscriber
Loop Interface Circuit (SLIC) and Switch integrates
the battery feed, test access relay, and ringing relay
that are necessary to interface a codec to the tip and
ring of a subscriber loop into one low-power, low-cost
package. It is built using a 90 V complementary bipo-
lar (CBIC) process and a 320 V Bipolar-CMOS-
DMOS (BCDMOS) process. The device is available
in a 44-pin PLCC package.
The device can be connected directly to the Agere
Systems Inc. T8531/T8532 16-Channel Programma-
ble Codec Chip Set without the need for any ac inter-
face components.
Low active power
Quiet tip/ring polarity reversal
Distortion-free on-hook transmission
35 V to 60 V power supply operation
14 operating states:
— Forward battery active
— Reverse battery active
— Ground start (3)
— Forward battery ring open
— Reverse battery ring open
— Reverse battery tip open
— High impedance
— Ringing (2)
— Low current (2)
— Disconnect
Self-test in all operating states
Independent, adjustable ac and dc parameters:
— Switchhook detector threshold
— Loop current limit
— dc feed resistance
— Termination impedance
Integrated ringing access relay
Integrated test-in relay
Integrated relay driver
Integrated ring trip detector
Thermal protection
44-pin, surface-mount, plastic package (PLCC)
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AGERE [ AGERE SYSTEMS ]
