LUCL8574DP-D AGERE [Agere Systems], LUCL8574DP-D Datasheet - Page 17

• Manufacturer Part Number: LUCL8574DP-D
• Description: L8574D Resistive Subscriber Line Interface Circuit(SLIC), Ring Relay,and Protector(SRP)for Long Loop and TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

Data Sheet
October 1998
Operating States
Disconnect State
Alternate Talk State
Talk State
Lucent Technologies Inc.
Forward disconnect state.
The receive transmission path is powered down; the
transmit path is powered up.
The current limiter is powered down and disabled.
SW1, SW2, and SW3 are open.
Pins PT, PR, and V
(>100 k ).
NSTAT is forced high (on-hook).
Alternate talk state.
The battery feed is connected to the high battery
supply (V
The receive and transmit transmission paths are both
powered up.
The current limiter is powered up and active.
SW1 and SW2 are closed; SW3 is open.
NSTAT reflects the status of the switchhook detector.
Normal talk state.
The battery feed is connected to the high battery
supply (V
The receive and transmit transmission paths are both
powered up.
The current limiter is powered up and active.
SW2 is closed; SW1 and SW3 are open.
NSTAT reflects the status of the switchhook detector.
BAT1
BAT2
).
).
BF
are high impedance
(continued)
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Scan Current-Limit State
Ringing State
On-Hook Transmission State
Alternate on-hook supervision state.
Same as scan state but with the current limiter pow-
ered up and active.
The receive transmission path is powered down; the
transmit path is powered up.
SW1 is closed; SW2 and SW3 are open.
NSTAT reflects the status of the switchhook detector.
Normal ringing state.
The receive and transmit transmission paths are both
powered down.
SW3 is closed; SW1 and SW2 are open.
The current limiter is powered down and disabled.
NSTAT reflects the status of the ring trip detector.
Normal on-hook transmission state.
The battery feed is connected to the high battery
supply (V
The receive and transmit transmission paths are both
powered up.
The current limiter is powered down and disabled.
A 10 mA dc bias current flows out of the Ring current
driver into PR, and a 5 mA dc bias current flows into
the Tip current driver from PT (the switchhook detec-
tor is adjusted to compensate for this dc bias cur-
rent).
SW1 and SW2 are closed; SW3 is open.
NSTAT reflects the status of the switchhook detector.
BAT1
).
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