Product Brief
June 2000
L7581/2/3 and L8581
Ringing, Tip/Ring, and Line Card Access Switches
Features
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Small size/surface-mount packaging
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Monolithic IC reliability
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Low impulse noise
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Make-before-break, break-before-make operation
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Clean, bounce-free switching
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Low, matched ON resistance
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Built-in current limiting, thermal shutdown, and
SLIC protection
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5 V only operation, very low power consumption
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Battery monitor, all OFF state upon loss of battery
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No EMI
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Latched logic level inputs, no drive circuitry
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Only one external protector required
Applications
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Central office
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DLC
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PBX
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DAML
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HFC/FITL
Description
The L7581/8581 provides solid-state access for
power ringing applications. The L7582 provides
access for power ringing and line test. The L7583
line card access switch (LCAS) provides power ringing, line test, and self-test access.
Incorporated into the L758xA is a diode bridge/SCR
clamping circuit, current-limiting circuitry, and thermal
shutdown mechanism. The L758xB provides a diode
bridge clamping circuit, current-limiting circuitry, and
thermal shutdown mechanism.
A single external protection device is required. Agere
Systems Inc. has available characterized protection
devices designed to work with Agere LCAS devices
(contact a Agere account representative for information about these products).
Agere LCAS devices require a 5 V supply to operate.
Additionally, a battery monitor circuit is included,
which forces an all-off state if the battery is lost.
The L7581 device is packaged in a 16-pin, plastic
DIP package (L7581AC/BC) and a 16-pin, plastic
SOG package (L7581AAE/BAE). These devices are
pin compatible with the L7541 device.
The L7582 device is packaged in a 16-pin, plastic
DIP package (L7582AC/BC) and a 16-pin,
plastic SOG package (L7582AAE/BAE). The
L7582AAE/BAE are pin compatible with the
L7542AAE/BAE.
The L7583A/B/C/D device is packaged in a 24-pin,
plastic DIP (L7583AF/BF/CF/DF) and a 28-pin,
plastic SOG package (L7583AAJ/BAJ/CAJ/DAJ).
