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ATTL7557AAU Datasheet(PDF) 6 Page - Agere Systems

Part # ATTL7557AAU
Description  Low-Power SLICs with Battery Switch
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Manufacturer  AGERE [Agere Systems]
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6
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Functional Description
Table 2. Input State Coding
Table 3. Supervision Coding
Absolute Maximum Ratings (TA = 25 °C)
Stresses in excess of the Absolute Maximum Ratings can cause permanent damage to the device. These are
absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in
excess of those given in the operational sections of the data sheet. Exposure to Absolute Maximum Ratings for
extended periods can adversely affect device reliability.
Note:
The IC can be damaged unless all ground connections are applied before, and removed after, all other connections. Furthermore, when
powering the device, the user must guarantee that no external potential creates a voltage on any pin of the device that exceeds the
device ratings. Some of the known examples of conditions that cause such potentials during powerup are the following:
1. An inductor connected to tip and ring can force an overvoltage on VBAT through the protection devices if the VBAT connections chatter.
2. Inductance in the VBAT leads could resonate with the VBAT filter capacitors to cause a destructive overvoltage.
B0
B1
BS
State/Definition
1
1
1
Powerup, Forward Battery. Normal talk and battery feed state. Pin PT is positive with respect
to PR. On-hook transmission is enabled. VBAT1 is applied to entire circuit.
1
1
0
Powerup, Forward Battery. Normal talk and battery feed state. Pin PT is positive with respect
to PR. On-hook transmission is enabled.
For the L7556 only, VBAT2 is applied to tip/ring drive amplifiers.
For the L7557 only, the device compares the magnitude of VBAT2 to the voltage necessary to
maintain proper loop current. Then the device automatically applies VBAT2 to tip/ring drive am-
plifiers when possible, not affecting the desired dc template.
1
0
1
2-Wire Wink. Pins PT and PR are put at the same potential (near ground). VBAT1 is applied to
entire circuit.
0
0
1
Disconnect. The tip and ring amplifiers are turned off, and the SLIC goes to a high-impedance
state (>100 k
Ω).VBAT1 is applied to entire circuit.
Pin NLC
Pin NRDET
Pin RGDET
0 = off-hook
1 = on-hook
0 = ring trip
1 = no ring trip
1 = ring ground
0 = no ring ground
Parameter
Symbol
Value
Unit
5 V Power Supply
VCC
7.0
V
Battery (Talking) Supply
VBAT1
–63
V
Auxiliary Battery Supply
VBAT2
–63
V
Logic Input Voltage
–0.5 to +7.0
V
Analog Input Voltage
–7.0 to +7.0
V
Maximum Junction Temperature
TJ
165
°C
Storage Temperature Range
Tstg
–40 to +125
°C
Relative Humidity Range
RH
5 to 95
%
Ground Potential Difference (BGND to AGND)
±3
V
PT or PR Fault Voltage (dc)
VPT, VPR
(VBAT1 – 5) to +3
V
PT or PR Fault Voltage (10 x 1000 µs)
VPT, VPR
(VBAT1 – 15) to +15
V
Current into Ring Trip Inputs
IRTSP, IRTSN
±240
µA


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