CLT3-4BT6 STMicroelectronics, CLT3-4BT6 Datasheet - Page 5

• Manufacturer Part Number: CLT3-4BT6
• Description: IC DGTL TERMINATION QUAD 20TSSOP
• Manufacturer: STMicroelectronics

Specifications of CLT3-4BT6

• Technology: Mixed Technology
• Number Of Circuits: 4
• Applications: General Purpose
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Voltage - Working: -
• Voltage - Clamping: -

CLT3-4B
1.2
The current limiting circuit connected between the input and the output pins is compensated
all over the temperature range. Thanks to its low tolerance, the current limitation allows
reducing drastically the dissipation of the input compared to a resistive input: the overall
module requires less cooling capability and becomes smaller.
The output block of each termination channel controls the operation of an opto-coupler that
is enabled by a Light Emitting Diode.
When the input current is less than 1.5 mA, this output circuit derivates the input current to
maintain the opto-coupler off.
The original structure of the CLT limiter allows its activation threshold to be low and
insensitive to the output voltage up to a maximum value of 2.0 V.
When the CLT input voltage V
than 11 V and a series resistor R
current (3/4) is higher than 1.5 mA. The whole termination channel including the opto-
coupler is on.
Depending on the input type operation that is described by the IEC 61131-2 standard, the
input resistance R
This document describes operation and characteristics for type 3 operation with
V
In type 1 operation the on state threshold V
R
Input characteristics of CLT3-4
Figure 4.
ON MIN
I
is set 2.2 kΩ.
= 11 V and R
30
25
20
15
10
V (V)
5
0
Typical input characteristics of each CLT3-4 channel
IN
0
30
I
5
can be adjusted because of the different on-state threshold V
Off-state
0.5
I
= 1.2 kΩ.
IN
1
is higher than 5 V, or the module input voltage Vi higher
I
= 1.2 kΩ, the output current that is a share of the input
1.5
ON MIN
2
I (mA)
IN
is 12.34 V instead, and the input resistor
On-state
2.5
3
3.5
3.7
Characteristics
4
ON MIN
.
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