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L8574D

Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Long Loop and TR-57 Applications

Agere -> LSI Corporation 

Data Sheet

October 1998

L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring

Relay, and Protector (SRP) for Long Loop and TR-57 Applications

Electrical Characteristics (continued)

Fault Protection

Pins PT, PR, and VBF

Pins PT, PR, and VBF are protected by SCRs which clamp surge currents (both positive and negative) to FGND. If

the SCR on PR or VBF triggers due to a negative surge, the L8574 automatically switches to the disconnect state

while the SCR is conducting current above its hold current. After the SCR releases, the L8574 automatically

switches back to the operating state prior to the SCR trigger.

Table 5. Electrical Characteristics of Pins PT, PR, and VBF

Parameter

Min

Typ

PT and PR:

Surge Current1:

Lightning—10 µs x 1000 µs

Lightning—2 µs x 10 µs

Power Cross—60 Hz, 50 ms

Power Cross—60 Hz, 1 s

—

—

—

—

—

—

—

—

Power Cross—60 Hz, 15 min.

—

—

SCR Trigger Voltage Pin PT:

Positive

Negative

dc Transient Response

VCCA – 2

—

–25

—

–25

—

SCR Trigger Voltage Pin PR:

Positive

Negative

150

—

–220

—

SCR Hold Current (positive and negative)

10

—

VBF:

Surge Current1:

Lightning—10 µs x 1000 µs

Lightning—2 µs x 10 µs

Power Cross—60 Hz, 50 ms

Power Cross—60 Hz, 1 s

Power Cross—60 Hz, 15 min.

—

—

—

—

—

—

—

—

—

—

SCR Trigger Voltage:

Positive

Negative

150

—

–220

—

SCR Hold Current (positive and negative)

10

—

Trigger Current (if from a power supply—PT, PR, and VBF)

—

—

dV/dt Sensitivity1, 2 (PT, PR, and VBF)

—

500

1. This parameter is not tested in production. It is guaranteed by design and device characterization.

2. Applied voltage is 50 Vpp square wave at 100 Hz to measure dV/dt sensitivity.

Max

Unit

±1

±2.5

600

200

50

VCCA + 4

–35

–55

280

320

—

A

A

mArms

mArms

mArms

V

V

V

V

V

mA

±5.5

±13

3

800

150

280

–320

—

±250

—

A

A

Arms

mArms

mArms

V

V

mA

µA

V/µs

Lucent Technologies Inc.

9

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