L3845B STMicroelectronics, L3845B Datasheet

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L3845B

Manufacturer Part Number
L3845B
Description
IC TRUNK INTERFACE 8-MINIDIP
Manufacturer
STMicroelectronics
Datasheet

Specifications of L3845B

Applications
Monitoring, Digital Current
Package / Case
8-DIP (0.300", 7.62mm)
Mounting Type
Through Hole
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Interface
-
Other names
497-3625

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L3845B
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ST
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S/T
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L3845B
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L3845B1
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L3845B1
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L3845B1-
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Part Number:
L3845BI
Manufacturer:
ST
0
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

Related parts for L3845B

L3845B Summary of contents

Page 1

... IN2 September 2003 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. Minidip L3845B 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- ...

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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