attl7581bae-tr ETC-unknow, attl7581bae-tr Datasheet

attl7581bae-tr

Manufacturer Part Number

attl7581bae-tr

Description

Ringing Access Switch

Manufacturer

ETC-unknow

Datasheet

1.ATTL7581BAE-TR.pdf (16 pages)

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Data Sheet

November 1999

Features

Applications

Description

The L7581 Ringing Access Switch is a monolithic

solid-state device that provides the switching func-

tionality of a 2 form C switch.

The L7581 is designed to provide power ringing

access to tip and ring in central office, digital loop

carrier, private branch exchange, digitally added

main line, and hybrid fiber coax/fiber-in-the-loop ana-

log line card applications. The L7581 has three

Small size/surface-mount packaging

Monolithic IC reliability

Low impulse noise

Make-before-break, break-before-make operation

Clean, bounce-free switching

Low, matched ON-resistance

Built-in current limiting, thermal shutdown, and

SLIC protection

5 V only operation, very low power consumption

Battery monitor, all OFF state upon loss of battery

No EMI

Latched logic level inputs, no drive circuitry

Only one external protector required

Central office

DLC

PBX

DAML

HFC/FITL

states: the idle talk state (line break switches closed,

ringing access switches open), the power ringing

state (line break switches open, ringing access

switches closed), and an all OFF state.

The L7581 offers break-before-make or make-before-

break switching, with simple logic level input control.

Because of the solid-state construction, voltage tran-

sients generated when switching into an inductive

ringing load during ring cadence or ring trip are mini-

mized, possibly eliminating the need for external zero

cross switching circuitry. State control is via logic

level inputs, so no additional driver circuitry is

required.

The line break switch is a linear switch that has

exceptionally low ON-resistance and an excellent

ON-resistance matching characteristic. The ringing

access switch has a breakdown voltage rating

>480 V which is sufficiently high, with proper protec-

tion, to prevent breakdown in the presence of a tran-

sient fault condition (i.e., passing the transient on to

the ringing generator).

Incorporated into the L7581Axx is a diode bridge/

SCR clamping circuit, current-limiting circuitry, and a

thermal shutdown mechanism to provide protection

to the SLIC device and subsequent circuitry during

fault conditions (see Figure 1). Positive and negative

lightning is reduced by the current-limiting circuitry

and steered to ground via diodes and the integrated

SCR. Power cross is also reduced by the current-

limiting and thermal shutdown circuits.

The L7581Bxx version provides only an integrated

diode bridge along with current limiting and thermal

shutdown, as shown in Figure 2. This will cause pos-

itive faults to be directed to ground and negative

faults to battery. In either polarity, faults are reduced

by the current-limit and/or thermal shutdown mecha-

nisms.

L7581 Ringing Access Switch

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attl7581bae-tr Summary of contents

Page 1

Data Sheet November 1999 Features Small size/surface-mount packaging Monolithic IC reliability Low impulse noise Make-before-break, break-before-make operation Clean, bounce-free switching Low, matched ON-resistance Built-in current limiting, thermal shutdown, and SLIC protection 5 V only operation, very low power consumption Battery ...

Page 2

L7581 Ringing Access Switch Description (continued) To protect the L7581 from an overvoltage fault condi- tion, use of a secondary protector is required. The sec- ondary protector must limit the voltage seen at the tip/ ring terminals to prevent the ...

Page 3

Data Sheet November 1999 Pin Information (continued) Table 1. Pin Descriptions DIP SOG Symbol Fault ground. GND connection Connect to TIP on SLIC side. BAT Connect to ...

Page 4

L7581 Ringing Access Switch Electrical Characteristics T = –40 °C to +85 °C, unless otherwise specified. A Minimum and maximum values are testing requirements. Typical values are characteristics of the device and are the result of engineering evaluations. Typical values ...

Page 5

Data Sheet November 1999 Electrical Characteristics Table 6. Ring Return Switch, 3 Parameter OFF-state Leakage Current (SW3): +25 °C Vswitch (differential) = –320 V to Gnd Vswitch (differential) = – +260 V +85 °C Vswitch (differential) = –330 ...

Page 6

L7581 Ringing Access Switch Electrical Characteristics 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 V Current DD V Current BAT Temperature ...

Page 7

Data Sheet November 1999 Switching Behavior (continued) When using an L7581 in the make-before-break mode, during the ring-to-idle transition, for a period one-half the ringing frequency, the ring break switch and the pnpn-type ring access switch can ...

Page 8

L7581 Ringing Access Switch Power Supplies Both the 5 V and battery supply are brought onto the L7581. The L7581 requires only the 5 V supply for switch operation; that is, state control is powered exclu- sively off of the ...

Page 9

Data Sheet November 1999 Protection (continued) Integrated SLIC Protection During a power cross event, the current that is passed through the break switches and presented to the inte- grated protection circuit and subsequent circuitry is lim- ited by the dc ...

Page 10

L7581 Ringing Access Switch Protection (continued) Integrated SLIC Protection Table 11. Electrical Specifications, Protection Circuitry Parameters Related to Diodes (in Diode Bridge) Parameter Voltage Drop @ Continuous Cur- rent (50 Hz/60 Hz) Voltage Drop @ Surge Current Surge Current † ...

Page 11

Data Sheet November 1999 Typical Performance Characteristics dc CURRENT-LIMIT BREAK SWITCHES V – 2 BAT V – 4 BAT V V BAT ON < CURRENT LIMIT (OF BREAK SWITCHES Figure 3. Protection Circuit A ...

Page 12

L7581 Ringing Access Switch Application R1 TIP CROWBAR PROTECTION RING R2 Figure 7. Typical RAS Application, A Version, Idle, or Talk State Shown Table 12. Truth Table INPUT T Tip Break Switch Ring Break Switch ...

Page 13

Data Sheet November 1999 Outline Diagrams 16-Pin, Plastic SOG (L7581AAE/BAE) Note: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your design efforts, please contact your Lucent Technologies Sales Representative ...

Page 14

L7581 Ringing Access Switch Outline Diagrams (continued) 16-Pin, Plastic DIP (L7581AC/BC) Note: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your design efforts, please contact your Lucent Technologies Sales Representative. L ...

Page 15

... Device Part No. ATTL7581AAE Ringing Access Switch ATTL7581AAE-TR* Ringing Access Switch ATTL7581AC Ringing Access Switch ATTL7581BAE Ringing Access Switch ATTL7581BAE-TR* Ringing Access Switch ATTL7581BC Ringing Access Switch *Devices on tape and reel must be ordered in 1000-piece increments. Lucent Technologies Inc. Description Package 16-Pin SOG 16-Pin SOG (Tape & ...

Page 16

For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA ...

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