L7556, L7557 Low-Power SLICs
with Battery Switch
Data Sheet
January 2000
Recommended Operating Conditions
Parameter
Ambient Temperature
Min
–40
4.75
–24
–16
—
Typ
—
Max
85
Unit
°C
VCC Supply Voltage
5.0
–48
–28
10
5.25
–60
VBAT1
ILIM
45
V
VBAT1 Supply Voltage
V
VBAT2 Supply Voltage
V
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
mA
mA
Vrms
Ω
5
22
—
1
2.2
150
600
1300
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)
and the entire battery range unless otherwise specified. Typical is defined as 25 °C, VCC = 5.0 V, VBAT1 = –48 V,
VBAT2 = –48 V, and ILIM= 40 mA. Positive currents flow into the device. Test circuit is Figure 4 unless noted.
Table 4. Power Supply
Parameter
Min
Typ
Max
Unit
Power Supply—Powerup, No Loop Current:
ICC
—
—
—
2.8
–2.3
125
—
—
155
mA
mA
mW
IBAT (VBAT = –48 V)
Power Dissipation (VBAT = –48 V)
Power Supply Rejection 500 Hz to 3 kHz (See Figures 5, 6, 15, and 16.)1:
35
45
—
—
—
—
dB
dB
VCC
VBAT
Thermal Protection Shutdown (Tjc)
—
—
175
60
—
—
°C
Thermal Resistance, Junction to Ambient (θJA)
°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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