Data Sheet
March 1997
L7554 Low-Power SLIC
Recommended Operating Conditions
Parameter
Ambient Temperature
V
CC
Supply Voltage
V
BAT
Supply Voltage:
L7554AP
L7554BP
Loop Closure Threshold-detection Programming Range
dc Loop Current-limit Programming Range
On- and Off-hook 2-wire Signal Level
ac Termination Impedance Programming Range
Min
–40
4.75
–24
–24
—
5
—
150
Typ
—
5.0
–40
–48
10
40
1
600
Max
85
5.25
–60
–72
I
LIM
45
2.2
1300
Unit
°C
V
V
V
mA
mA
Vrms
Ω
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 testing
requirements. Minimum and maximum values apply across the entire temperature range (–40
°C
to +85
°C)
and
the entire battery range unless otherwise specified. Typical is defined as 25
°C,
V
CC
= 5.0 V, V
BAT
= –48 V, and
I
LIM
= 40 mA. Positive currents flow into the device. Test circuit is Figure 4 unless noted.
Table 4. Power Supply
Parameter
Power Supply—Powerup, No Loop Current
I
CC
I
BAT
(V
BAT
= –48 V)
Power Dissipation (V
BAT
= –48 V)
Power Supply—Low-Power Scan, Forward Bat, No Loop
Current
I
CC
I
BAT
(V
BAT
= –48 V)
Power Dissipation (V
BAT
= –48 V)
Power Supply Rejection 500 Hz to 3 kHz
(See Figures 5, 6, 15, and 16.)
1
V
CC
V
BAT
Thermal Protection Shutdown (T
jc
)
Thermal Resistance, Junction to Ambient (θ
JA
)
Min
—
—
—
Typ
4.1
–3.0
165
Max
4.8
–3.5
191
Unit
mA
mA
mW
—
—
—
2.7
–1.4
82
3.7
–1.7
100
mA
mA
mW
35
45
—
—
—
—
175
47
—
—
—
—
dB
dB
°C
°C/W
1. This parameter is not tested in production. It is guaranteed by design and device characterization.
Lucent Technologies Inc.
7
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