Data Sheet
May 2001
L8576B Dual Ringing SLIC
Electrical Characteristics
Generally, minimum and maximum values are testing requirements. However, some parameters may not be tested
in production because they are guaranteed by design and device characterization. Typical values reflect the design
center or nominal value of the parameter; they are for information only and are not a requirement. Minimum and
maximum values apply across the entire temperature range (0 °C to 70 °C) and entire battery range (to –72 V).
Unless otherwise specified, typical values are defined as 20 °C, VCC = 5.0 V, VBAT = –68.5 V. Positive currents flow
into the device.
Table 3. Operating Conditions and Powering
Parameter
Min
Typ
Max
Unit
Temperature Range
0
—
—
70
951
°C
Humidity Range
5
%RH
Supply Voltages:
VCC
VBAT
4.75
–242
5.0
–65
5.25
–72
V
V
Loop Closure Threshold—Detection Range
ac Termination Impedance Programming Range
On- and Off-hook 2-wire Signal Level
9.5
300
—
12
14.5
10003
—
mA
Ω
600
3.14
dBm
Power Supply—Powerup, No Loop Current (per section):
ICC
—
—
—
4.5
3.0
230
5.5
4.0
290
mA
mA
mW
IBAT (VBAT = –65 V)
Total power (one channel, VBAT = –65 V)
Power-supply Rejection (See Figures 6 and 7.):
VCC (1 kHz)
35
45
—
—
—
—
dB
dB
VBAT (500 Hz—3 kHz)
Thermal4:
Thermal Resistance (still air) Tj
Operating Tj
Thermal Shutdown Temperature
—
—
—
47
—
160
—
150
—
°C/W
°C
°C
1. Noncondensing.
2. The L8576B will operate below –24 V; –24 V is used for production test.
3. The termination impedance can be programmed up to 1200 Ω; 1000 Ω are used for production test.
4. This parameter is not tested in production. It is guaranteed by design and device characterization.
Table 4. Ring Trip Detector1
Parameter2
Min Typ Max
Unit
Ringing Source:
Frequency (ƒ) RRNG = 28.7 kΩ, RTTH = 52.3 kΩ
Frequency (ƒ) Contact Agere for Specific Component Values
17
20
20
—
23
50
Hz
Hz
C-message Weighted Noise (900 Ω)
—
—
—
—
90
40
dBrnC
Vrms
REN Load (1386 Ω + 40 µF) with Loop Resistance = 30 Ω, RPT = 30 Ω, RPR = 30 Ω
Detection Interval:
20 Hz
—
—
—
—
200
150
ms
ms
≥25 Hz
1. This table is provided for information purposes only.
2. These parameters are not tested in production.
10
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
