L3845D1013TR STMicroelectronics, L3845D1013TR Datasheet

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L3845D1013TR

Manufacturer Part Number
L3845D1013TR
Description
IC TRUNK INTERFACE 8-SOIC
Manufacturer
STMicroelectronics
Datasheet

Specifications of L3845D1013TR

Applications
Monitoring, Digital Current
Package / Case
8-SOIC
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Supply
-
Interface
-
Other names
497-3626-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
L3845D1013TR
Manufacturer:
ST
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Part Number:
L3845D1013TR-2
Manufacturer:
SGS
Quantity:
2 812
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
DESCRIPTION
The circuit provides DC loop termination for ana-
log trunk lines.
The V-I characteristics is equivalent to a fixed
voltage drop (zener like characteristic) in series
with an external resistance that determines the
slope of the DC characteristic.
An external low voltage electrolytic capacitor
causes the circuit to exhibit a very high imped-
ance to all AC signal above a minimum frequency
that is determined by the capacitor itself and by a
20 K nominal resistor integrated on the chip.
The Off-Hook status is detected all the time a
typic of 8 mA is flowing into the circuit. In this con-
dition a constant current generator is activated to
BLOCK DIAGRAM
September 2003
ON CHIP POLARITY GUARD
MEETS DC LINE CHARACTERISTICS OF
EITHER CCITT AND EIA RS 464 SPECS
PULSE FUNCTION
HIGH AC IMPEDANCE
OFF HOOK-STATUS DETECTION OUTPUT
LOW EXTERNAL COMPONENT COUNT
®
IN1
IN2
1
7
POLARITY
GUARD
S1
R2
ACT
5
TERMINATION
C1
R3
DC LINE
S2
DCT
6
supply an external device (typically an optocou-
pler) without affecting the AC characteristic of the
circuit.
When Pulse Dialing is required the PULSE input
(pin 3) connected to V- causes the device to re-
duce the fixed DC voltage drop and to exhibit a
pure resistive impedance equal to the external re-
sistor.
R1
L3845B
Minidip
DETECTION
OF HOOK
CIRCUIT
V-
2
ORDERING NUMBERS:
TRUNK INTERFACE
D96TL263
L3845D
SO8
8
3
4
V+
PULSE
HD0
L3845
L3845-20
(12+4+4)
SO20W
1/8

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L3845D1013TR Summary of contents

Page 1

ON CHIP POLARITY GUARD MEETS DC LINE CHARACTERISTICS OF EITHER CCITT AND EIA RS 464 SPECS PULSE FUNCTION HIGH AC IMPEDANCE OFF HOOK-STATUS DETECTION OUTPUT LOW EXTERNAL COMPONENT COUNT DESCRIPTION The circuit provides DC loop termination for ana- log ...

Page 2

L3845 ABSOLUTE MAXIMUM RATINGS Symbol V Max Line Voltage (pulse duration 10 ms max Max Line Current L P Total Power Dissipation at Tamb = 70 C tot T Operating Temperature Storage and Junction ...

Page 3

DC ELECTRICAL CHARACTERISTICS (I unless otherwise specified) Symbol Parameter V Line Voltage L (normal mode) V Line Voltage LP (pulse mode) I ON/OFF-Hook hn Line Current Detection Threshold I OFF/ON-Hook hf Line Current Detection Threshold I OFF-Hook OUT Output Drive ...

Page 4

L3845 Figure 1: Typical Application. 4/8 ...

Page 5

DIM. MIN. TYP. MAX. MIN. A 3.32 a1 0.51 0.020 B 1.15 1.65 0.045 b 0.356 0.55 0.014 b1 0.204 0.304 0.008 D 10.92 E 7.95 9.75 0.313 e 2.54 e3 7.62 e4 7.62 F 6.6 I 5.08 L ...

Page 6

L3845 mm DIM. MIN. TYP. MAX. A 1.75 a1 0.1 0.25 a2 1.65 a3 0.65 0.85 b 0.35 0.48 b1 0.19 0.25 C 0.25 0 (typ.) D (1) 4.8 5.0 E 5.8 6.2 e 1.27 e3 3.81 F ...

Page 7

DIM. MIN. TYP. MAX. MIN. A 2.35 2.65 0.093 A1 0.1 0.3 0.004 B 0.33 0.51 0.013 C 0.23 0.32 0.009 D 12.6 13 0.496 E 7.4 7.6 0.291 e 1. 10.65 0.394 h 0.25 0.75 0.010 ...

Page 8

... STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. ...

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