ATTL7582AC データシートの表示（PDF） - Agere -> LSI Corporation

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ATTL7582AC

Tip Ring Access Switch

Agere -> LSI Corporation 

Data Sheet

November 1999

L7582 Tip Ring Access Switch

Protection (continued)

Integrated SLIC Protection (continued)

External Secondary Protector

With the above integrated protection features, only one

overvoltage secondary protection device on the loop

side of the L7582 is required. The purpose of this

device is to limit fault voltages seen by the L7582 so as

not to exceed the breakdown voltage or input-output

isolation rating of the device. To minimize stress on the

L7582, use of a foldback- or crowbar-type device is rec-

ommended. A detailed explanation and design equa-

tions on the choice of the external secondary

protection device are given in the An Introduction to

L758X Series of Line Card Access Switches Applica-

tion Note. Basic design equations governing the choice

of external secondary protector are given below:

s |VBATmax| + |Vbreakovermax| < |Vbreakdownmin(break)|

s |Vringingpeakmax| + |VBATmax| + |Vbreakovermax| <

|Vbreakdownmin(ring)|

s |Vringingpeakmax| + |VBATmax| < |Vbreakovermin|

where:

VBATmax—Maximum magnitude of battery voltage.

Vbreakovermax—Maximum magnitude breakover volt-

age of external secondary protector.

Vbreakovermin—Minimum magnitude breakover voltage

of external secondary protector.

Vbreakdownmin(break)—Minimum magnitude breakdown

voltage of L7582 break switch.

Vbreakdownmin(ring)—Minimum magnitude breakdown

voltage of L7582 ring access switch.

Vringingpeakmax—Maximum magnitude peak voltage of

ringing signal.

Series current-limiting fused resistors or PTCs should

be chosen so as not to exceed the current rating of the

external secondary protector. Refer to the manufac-

turer’s data sheet for requirements.

Table 12. Electrical Specifications, Protection Circuitry

Parameters Related to Diodes (in Diode Bridge)

Parameter

Test Condition

Measure

Min

Typ

Voltage Drop @ Continuous Cur- Apply ±dc current limit Forward

—

—

rent (50 Hz/60 Hz)

of break switches

Voltage

Voltage Drop @ Surge

Current

Apply ±dynamic cur- Forward

—

5

rent limit of break

Voltage

switches

Parameters Related to Protection SCR

Surge Current

—

Gate Trigger Current*†

—

Gate Trigger Current† Temperature

—

Coefficient

—

—

—

—

—

25

—

—

–0.5

Hold Current

—

—

70

—

Gate Trigger Voltage

Trigger current

—

VBAT – 4 —

Reverse Leakage Current

ON-State Voltage§

VBAT

—

0.5 A, t = 0.5 µs

VON

2.0 A, t = 0.5 µs

—

—

—

—

–3

—

–5

Max

3

—

‡

50

—

—

VBAT – 2

1.0

—

—

Unit

V

V

A

mA

%/°C

mA

V

µA

V

V

* Previous versions of this data sheet specified a Trigger Current of 50 mA minimum. Trigger Current is defined as the minimum current drawn

from tip and ring to turn on the SCR. The specification in this data sheet is Gate Trigger Current, which is defined as the maximum current

that can flow into the battery before the SCR turns on.

† Typical at 25 °C.

‡ Twice ± dynamic current limit of break switches.

§ In some instances, the typical ON-state voltage can range as low as –25 V.

Lucent Technologies Inc.

11

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