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ATTL7581BAE

Ringing Access Switch

Agere -> LSI Corporation 

L7581 Ringing Access Switch

Data Sheet

November 1999

Electrical Characteristics (continued)

Table 8. Additional Electrical Characteristics

Parameter

Digital Input Characteristics:

Input Low Voltage

Input High Voltage

Input Leakage Current (high)

Input Leakage Current (low)

Power Requirements:

Power Dissipation

VDD Current

VBAT Current

Temperature Shutdown Requirements:*

Shutdown Activation Temperature

Shutdown Circuit Hysteresis

Test Condition

Measure Min Typ Max Unit

—

—

VDD = 5.5 V, VBAT = –75 V,

Vlogicin = 5 V

VDD = 5.5 V, VBAT = –75 V,

Vlogicin = 0 V

—

—

llogicin

——

3.5 —

——

1.5 V

—V

1 µA

llogicin — — 1 µA

VDD = 5 V, VBAT = –48 V,

Idle/talk state or all OFF state,

ringing state

VDD = 5 V,

Idle/talk state or all OFF state,

ringing state

VBAT = –48 V,

Idle/talk state or all OFF state,

ringing state

IDD, IBAT

IDD

IDD

IDD

IBAT

IBAT

— 3 5 mW

— 6 10 mW

— 560 900 µA

— 0.750 1.9 mA

— 4 10 µA

— 4 10 µA

—

—

110 125 150 °C

—

—

10 — 25 °C

* Temperature shutdown flag (TSD) will be high during normal operation and low during temperature shutdown state.

Zero Cross Current Turn Off

The ring access switch (SW4) is designed to turn off on

the next zero current crossing after application of the

appropriate logic input control. This switch requires a

current zero cross to turn off. Switch 4, once on, will

remain in the ON state (regardless of logic input) until a

current zero cross. Therefore, to ensure proper opera-

tion of switch 4, this switch should be connected, via

proper impedance, to the ringing generator or some

other ac source. Do not attempt to switch pure dc with

switch 4.

For a detailed explanation of the operation of switch 4,

please refer to the An Introduction to L758X Series of

Line Card Access Switches Application Note.

Switching Behavior

When switching from the power ringing state to the idle/

talk state via simple logic level input control, the L7581

is able to provide control with respect to the timing

when the ringing access contacts are released relative

to the state of the line break contacts.

Make-before-break operation occurs when the line

break switch contacts are closed (or made) before the

ringing access switch contact is opened (or broken).

Break-before-make operation occurs when the ringing

access contact is opened (broke) before the line break

switch contacts are closed (made).

Using the logic level input pins INPUT and TSD, either

make-before-break or break-before-make operation of

the L7581 is easily achieved. The logic sequences for

either mode of operation are given in Table 9 and Table

10. See the Truth Table (Table 12) for an explanation of

the logic states.

6

Lucent Technologies Inc.

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