Le79R241 Data Sheet
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Zarlink Semiconductor Inc.
VREF Input
The VE790 series SLAC device provides this voltage which is used by the Le79R241 ISLIC device
for internal reference purposes. All analog input and output signals interfacing to the VE790 series
SLAC device are referenced to this pin.
VSAB Output Scaled-down version of the voltage between the sense points SA and SB on this pin.
VTX Output
The voltage between this pin and VREF is a scaled down version of the AC component of the voltage
sensed between the SA and SB pins. One end of the two-wire input impedance programming network
connects to VTX. The voltage at VTX swings positive and negative with respect to VREF.
Exposed
Pad
Battery This must be electrically tied to VBH.
Pin Name Type Description
Le79R241 Data Sheet
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Zarlink Semiconductor Inc.
5.0 Electrical Characteristics
5.1 Absolute Maximum Ratings
Stresses above those listed under Absolute Maximum Ratings can cause permanent device failure. Functionality at
or above these limits is not implied. Exposure to absolute maximum ratings for extended periods can affect device
reliability.
Notes:
1. Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165° C. Operation above 145° C junction
temperature may degrade device reliability.
The thermal performance of a thermally enhanced package is assured through optimized printed circuit board layout. Specified performance
requires that the exposed thermal pad be soldered to an equally sized exposed copper surface, which, in turn, conducts heat through
multiple vias to a large internal copper plane.
2. Rise time of VBH (dv/dt) must be limited to less than 27 v/µs.
Storage temperature –55° to +150° C
Ambient temperature, under bias –40° to +85° C
Humidity 5% to 95%
VCC with respect to GND –0.4 to +7 V
VBH, VBL with respect to GND (see note 2) +0.4 to –104 V
BGND with respect to GND –3 to +3 V
Voltage on relay outputs +7 V
AD or BD to BGND:
Continuous VBH – 1 to BGND + 1
10 ms (F = 0.1 Hz) VBH – 5 to BGND + 5
1 µs (F = 0.1 Hz) VBH – 10 to BGND + 10
250 ns (F = 0.1 Hz) VBH – 15 to BGND + 15
Current into SA or SB:
10 µs rise to Ipeak
1000 µs fall to 0.5 Ipeak;
2000 µs fall to I =0
Ipeak = ±5 mA
Current into SA or SB:
2 µs rise to Ipeak
10 µs fall to 0.5 Ipeak;
20 µs fall to I = 0
Ipeak = ±12.5 mA
SA SB continuous 5 mA
Current through AD or BD ± 150 mA
P1, P2, P3, LD to GND –0.4 to VCC + 0.4 V
Maximum power dissipation (see note 1)
T
A
= 70° C
In 32-pin PLCC package
In 32-pin QFN package
T
A
= 85° C
In 32-pin PLCC package
In 32-pin QFN package
1.67 W
3.00 W
1.33 W
2.40 W
ESD Immunity (Human Body Model) JESD22 Class 1C compliant
Le79R241 Data Sheet
15
Zarlink Semiconductor Inc.
5.2 Thermal Resistance
The junction to air thermal resistance of the Le79R241 ISLIC device in a 32-pin PLCC package is 45° C/W and in a
32-pin QFN package is 25° C/W (measured under free air convection conditions and without external heat sinking).
5.2.1 Package Assembly
The standard (non-green) package devices are assembled with industry-standard mold compounds, and the leads
possess a tin/lead (Sn/Pb) plating. These packages are compatible with conventional SnPb eutectic solder board
assembly processes. The peak soldering temperature should not exceed 225°C during printed circuit board
assembly.
Green package devices are assembled with enhanced, environmental compatible lead-free, halogen-free, and
antimony-free materials. The leads possess a matte-tin plating which is compatible with conventional board
assembly processes or newer lead-free board assembly processes. The peak soldering temperature should not
exceed 245°C during printed circuit board assembly.
Refer to IPC/JEDEC J-Std-020B Table 5-2 for the recommended solder reflow temperature profile.
5.3 Operating Ranges
Zarlink guarantees the performance of this device over commercial (0ºC to 70ºC) and industrial (-40ºC to 85ºC)
temperature ranges by conducting electrical characterization over each range and by conducting a production test
with single insertion coupled to periodic sampling. These characterization and test procedures comply with section
4.6.2 of Bellcore GR-357-CORE Component Reliability Assurance Requirements for Telecommunications
Equipment.
5.3.1 Environmental Ranges
5.3.2 Electrical Ranges
Ambient Temperature
0 to 70° C Commercial
–40 to +85 ° C extended temperature
Ambient Relative Humidity 15 to 85%
VCC 5 V ± 5%
VBL –15 V to VBH
VBH –42.5 to –99V
BGND with respect to GND –100 to +100 mV
Load resistance on VTX to V
REF
20 k minimum
Load resistance on VSAB to V
REF
20 k minimum

LE79R241DJC

Mfr. #:
Manufacturer:
Microchip / Microsemi
Description:
Telecom Interface ICs
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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