attl7582bc ETC-unknow, attl7582bc Datasheet

attl7582bc

Manufacturer Part Number

attl7582bc

Description

Tip Ring Access Switch

Manufacturer

ETC-unknow

Datasheet

1.ATTL7582BC.pdf (16 pages)

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Data Sheet

November 1999

Features

Applications

Description

The L7582 Tip Ring Access Switch is a monolithic

solid-state device that provides the switching

functionality of a 2 form C switch.

The L7582 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-

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

log line card applications. An additional pair of solid-

state contacts provides access to the telephone loop

for line test access or message waiting in the PBX

application.

The L7582 has four states: the idle talk state (line

break switches closed, ringing and loop access

switches open), the power ringing state (ringing

access switches closed, line break and loop access

switches open), loop access state (loop access

switches closed, line break and ringing access

switches open), and an all OFF state.

The L7582 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 L7582Axx 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.

L7582 Tip Ring Access Switch

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attl7582bc 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

L7582 Tip Ring Access Switch Description (continued) The L7582Bxx version provides only an integrated diode bridge along with current limiting and thermal shutdown as shown in Figure 2. This will cause positive faults to be directed to ground and negative ...

Page 3

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

Page 4

L7582 Tip Ring Access Switch Electrical Characteristics T = – +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 ...

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

L7582 Tip Ring Access Switch Electrical Characteristics Table 8. Loop Access Switches, 5 and 6 Parameter OFF-state Leakage Current: Vswitch (differential) = –320 V to Gnd +25 C Vswitch (differential) = – +260 V Vswitch (differential) = –330 ...

Page 7

Data Sheet November 1999 Electrical Characteristics Table 9. 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 8

L7582 Tip Ring Access Switch Switching Behavior (continued) When using an L7582 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 ...

Page 9

Data Sheet November 1999 Switching Behavior (continued) Table 11. Break-Before-Make Operation ACCESS INPUT T State Float Power Ringing Float All Off Float All Off ...

Page 10

L7582 Tip Ring Access Switch Protection Integrated SLIC Protection Diode Bridge/SCR In the L7582Axx version, protection to the SLIC device or other subsequent circuitry is provided by a combina- tion of current-limited break switches, a diode bridge/ SCR clamping circuit, ...

Page 11

Data Sheet November 1999 Protection (continued) Integrated SLIC Protection 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 ...

Page 12

L7582 Tip Ring Access Switch 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 ...

Page 13

Data Sheet November 1999 Application R1 TIP CROWBAR PROTECTION R2 RING Figure 7. Typical TRAS Application, Idle, or Talk State Shown Table 13. Truth Table Input Access V/Float ...

Page 14

L7582 Tip Ring Access Switch Outline Diagrams 16-Pin, Plastic SOG (L7582AAE/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. L ...

Page 15

Data Sheet November 1999 Outline Diagrams (continued) 16-Pin, Plastic DIP (L7582AC/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 16

... ATTL7582BAE Tip Ri ng Access Switch ATTL7582BAE-TR* Tip Ri ng Access Switch ATTL7582BC Tip Ri ng Access Switch *Devices o n tape an d reel must be ordered i n 1000-piece inc rement s. For additi onal info rm ation, contact your Microelectronics Group Acc ount Manager or the followi ng: INTERNET: http://www ...

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