Lucent Technologies Inc.

7

Data Sheet

January 2000

with Battery Switch

L7556, L7557 Low-Power SLICs

Recommended Operating Conditions

Electrical Characteristics

Minimum and maximum values are testing requirements. Typical values are characteristic of the device and are

the result of engineering evaluations. Typical values are for information purposes only and are not part of the test-

ing requirements. Minimum and maximum values apply across the entire temperature range (–40 °C to +85 °C)

Table 4. Power Supply

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

Parameter

Min

Typ

Max

Unit

Ambient Temperature

–40

—

85

°C

4.75

5.0

5.25

V

–24

–48

–60

V

–16

–28

V

Loop Closure Threshold-detection Programming Range

—

10

mA

dc Loop Current-limit Programming Range

5

22

45

mA

On- and Off-hook 2-wire Signal Level

—

1

2.2

Vrms

ac Termination Impedance Programming Range

150

600

1300

Ω

Parameter

Min

Typ

Max

Unit

Power Supply—Powerup, No Loop Current:

—

—

—

2.8

–2.3

125

—

—

155

mA

mA

mW

35

45

—

—

—

—

dB

dB

—

175

—

°C

Thermal Resistance, Junction to Ambient (

—

60

—

°C/W