10
Agere Systems Inc.
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, V
CC
= 5.0 V, V
BAT
= –68.5 V. Positive currents flow
into the device.
Table 3. Operating Conditions and Powering
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
; 1000
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 Detector
1
1. This table is provided for information purposes only.
2. These parameters are not tested in production.
Parameter
Min
0
5
Typ
—
—
Max
70
95
1
Unit
°
C
%RH
Temperature Range
Humidity Range
Supply Voltages:
V
CC
V
BAT
Loop Closure Threshold—Detection Range
ac Termination Impedance Programming Range
On- and Off-hook 2-wire Signal Level
Power Supply—Powerup, No Loop Current (per section):
I
CC
I
BAT
(V
BAT
= –65 V)
Total power (one channel, V
BAT
= –65 V)
Power-supply Rejection (See Figures 6 and 7.):
V
CC
(1 kHz)
V
BAT
(500 Hz—3 kHz)
Thermal
4
:
Thermal Resistance (still air) T
j
Operating T
j
Thermal Shutdown Temperature
4.75
–24
2
9.5
300
—
5.0
–65
12
600
3.14
5.25
–72
14.5
1000
3
—
V
V
mA
dBm
—
—
—
4.5
3.0
230
5.5
4.0
290
mA
mA
mW
35
45
—
—
—
—
dB
dB
—
—
—
47
—
160
—
150
—
°
C/W
°
C
°
C
Parameter
2
Min
Typ
Max
Unit
Ringing Source:
Frequency (
) R
RNG
= 28.7 k
,
R
TTH
= 52.3 k
Frequency (
) Contact Agere for Specific Component Values
C-message Weighted Noise (900
)
REN Load (1386
+ 40
μ
F) with Loop Resistance = 30
,
R
PT
= 30
,
R
PR
= 30
Detection Interval:
20 Hz
≥
25 Hz
17
20
—
—
20
—
—
—
23
50
90
40
Hz
Hz
dBrnC
Vrms
—
—
—
—
200
150
ms
ms