8

Agere Systems Inc.

Data Sheet

November 2001

with Reverse Battery and Dual Current Limit

L9219A/G Low-Cost Line Interface

Electrical Characteristics

Minimum and maximum values are testing requirements in the temperature range of 25 °C to 85 °C and battery

range of –24 V to –70 V. These minimum and maximum values are guaranteed to –40 °C based on component

simulations and design verification of samples, but devices are not tested to –40 °C in production. The test circuit

shown in Figure 4 is used, unless otherwise noted. Positive currents flow into the device.

Typical values are characteristics of the device design at 25 °C based on engineering evaluations and are not part

otherwise noted.

Table 4. Power Supply

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

2. Careful thermal design as a function of maximum battery, loop length, maximum ambient temperature package thermal resistance, airflow,

PCB board layers, and other related parameters must ensure that thermal shutdown temperature is not exceeded under normal use condi-

tions.

3. Airflow, PCB board layers, and other factors can greatly affect this parameter.

Parameter

Min

Typ

Max

Unit

Power Supply—Powerup, No Loop Current:

—

—

—

4.6

–2.4

138

5.6

–2.7

158

mA

mA

mW

Power Supply—Scan, No Loop Current:

—

—

—

2.8

–0.8

52

3.8

–1.0

67

mA

mA

mW

Power Supply—Disconnect, No Loop Current:

—

—

—

1.6

–0.12

14

—

—

—

mA

mA

mW

Power Supply Rejection 500 Hz to 3 kHz

30

40

—

—

—

—

dB

dB

150

165

—

°C

Thermal Resistance, Junction to Ambient (

Natural Convection 2S2P Board

Natural Convection 2S0P Board

Wind Tunnel 100 Linear Feet per Minute (LFPM) 2S2P Board

Wind Tunnel 100 Linear Feet per Minute (LFPM) 2S0P Board

—

—

—

—

30

43

27

36

—

—

—

—

°C/W

°C/W

°C/W

°C/W