LUCL8560EP-D 查看數據表（PDF） - Agere -> LSI Corporation

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LUCL8560EP-D

Low-Power SLIC with Ringing

Agere -> LSI Corporation 

Data Sheet

April 2000

L8560 Low-Power SLIC with Ringing

Functional Description

Table 3. Input State Coding

B0 B1 B2 BR

State/Definition

1 1 0 1 Powerup, Forward Battery VBAT2. Pin PT is positive with respect to pin PR. VBAT2 is applied

to the tip/ring drive amplifiers. On-hook transmission capability. All supervision active—an

off-hook condition or a ring trip causes output NSTAT to go low.

1 0 0 1 Powerup, Reverse Battery VBAT2. Pin PR is positive with respect to pin PT. VBAT2 is applied

to the tip/ring drive amplifiers. On-hook transmission capability. All supervision active—an

off-hook condition or a ring trip causes output NSTAT to go low.

1 1 1 1 Powerup, Forward Battery VBAT1. Pin PT is positive with respect to pin PR. VBAT1 is applied

to the tip/ring drive amplifiers. On-hook transmission capability. All supervision active—an

off-hook condition or a ring trip causes output NSTAT to go low.

1 0 1 1 Powerup, Reverse Battery VBAT1. Pin PR is positive with respect to pin PT. VBAT1 is applied

to the tip/ring drive amplifiers. On-hook transmission capability. All supervision active—an

off-hook condition or a ring trip causes output NSTAT to go low.

0 1 1 1 Ground Start. Tip drive amplifier is turned off. The device presents a high impedance

(>100 kΩ) to pin PT and a current-limited battery (VBAT1) to pin PR. Output pin RGDET indi-

cates current flowing in the ring lead.

0 0 1 1 Low-Power Scan. Except for off-hook supervision, all circuits are shut down to conserve

power. Only the off-hook detector affects output pin NSTAT. VBAT1 is applied to the tip/ring

drive amplifiers. Pin PT is positive with respect to pin PR. On-hook transmission is disabled.

0 1 0 1 Low-Power Scan (L8560D/E/F/G Only). Except for off-hook supervision, all circuits are shut

down to conserve power. Only the off-hook detector affects output pin NSTAT. VBAT2 is ap-

plied to the tip/ring drive amplifiers. Pin PT is positive with respect to pin PR. On-hook trans-

mission is disabled.

0 0 0 1 Forward Disconnect. The tip and ring amplifiers are turned off and the SLIC goes into a

high-impedance state (>100 kΩ). VBAT2 is applied to the SLIC.

1 1/0 1

0 Ring State. SLIC is powered up. VBAT1 is applied to the tip and ring amplifiers. Current limit

is increased by a factor of 2.8. Overhead voltage is reduced to approximately 2.4 V. These

conditions are necessary to supply sufficient power to drive a true North American 5 REN

ringing load (1386 Ω + 40 µF). Loop closure detector is disabled—only the ring trip detector

affects output pin NSTAT. To apply a balanced ring signal to pins PR and PT, apply a 0 V to

5 V square wave to input pin B1. Ringing frequency is the frequency of the input wave at B1.

To shape the ring signal at pins PR and PT, connect a capacitor from pin FB1 to ground and

from pin FB2 to ground.

Table 4. Supervision Coding

Pin NSTAT

0 = off-hook or ring trip

1 = on-hook and no ring trip

Pin RGDET

1 = ring ground

0 = no ring ground

Lucent Technologies Inc.

9

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