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CLT3-4BT6

P1-P3P4-P6P7-P9P10-P12P13-P13
November 2007 Rev 5 1/13
CLT3-4B
Current limited over-voltage protected quad digital termination
Features
■ 4 channel topology
■ Wide range input dc Voltage:
–V
I
= - 0.3 to 30 V with R
I
= 0
–V
I
= - 30 to 30 V with R
I
= 1.8 kΩ
– Low side configuration with common
ground
■ Current limiter:
–I
GEN
= 3 mA
– Input current limiter activation voltage < 5 V
– Temperature compensated operation
■ Opto-coupler drive:
– No coupler activation below 1.5 mA input
current
■ Input protection (R
I
= 1.2 kΩ):
– IEC 61000-4-2 electrostatic discharge
ESD, Class 3
In contact, ± 6 kV; in air, ± 8 kV
Level B: temporary disruption; no
change of opto-coupler state
– IEC 61000-4-5 voltage surge, Class 3
± 1000 V with 42 Ω serial resistor in
differential mode
Level B: temporary disruption
– IEC 61000-4-4 transient burst immunity
± 4 kV peak voltage; 5 kHz repetitive
rate
Level A: fully functional
■ Operating ambient temperature: - 25 to 85° C
Benefits
■ Reduced overall dissipation
■ Compact with high integration
■ Enables input to meet type 1 and 3
characteristic of IEC 61131-2 standard
■ Compatible operation with 2 and 3 wires
proximity sensor according EN60947-5-2
standard
■ Insensitive to the on state sensor impedance
■ Surface mount package for highly automated
assembly
■ Enhanced functional reliability
Applications
■ Industrial automation
■ Programmable logic controller
■ Communication field bus nodes
■ Peripheral input / output modules
■ Machine tool interface
Description
The CLT3-4 is a quadruple input digital
termination device designed for 24 V dc
automation applications. It provides the front-end
circuitry of a digital input module (I/O) in industrial
automation, and drives an isolating opto-coupler.
Figure 1. Pin configuration
TSSOP20
COM
IN
ESD
12
IN
2
V
C
OUT
1
OUT
2
OUT
4
OUT
3
COM
34
COM
COM
COM
12
COM
COM
12345678910
11121314151617181920
COMESD
34
IN
3
IN
4
ESD
C
The pins ESD, COM
IJ
, COM (pins # 1, 3, 6, 8, 10, 11,
13, 15, 16, 18, 20) must be connected together
externally. This common pad COM is enlarged to
reduce the thermal resistance and improve the device
cooling. The COM and IN pins are designed to
minimize the EMI effects on the circuit.
www.st.com
Characteristics CLT3-4B
2/13
1 Characteristics
Figure 2. Functional block diagram
Table 1. Absolute ratings (limiting values)
Symbol Parameter Value Unit
V
CC
V
C
Supply steady state voltage, R
C
= 0 kΩ - 0.3 to 30 V
Supply steady state voltage, R
C
= 4.7 kΩ - 30 to 30 V
V
I
(1)
1. V
I
= V
IN
+ R
I
x I
IN
; V
IN
= voltage at the input pin itself
IN
Input steady state voltage, R
I
= 0 kΩ - 0.3 to 30 V
Input steady state voltage, R
I
= 1.2 kΩ - 0.3 to 32 V
Input repetitive pulse voltage, R
I
= 1.2 kΩ - 0.3 to 35 V
Input repetitive pulse voltage,
R
I
= 1.8 kΩ, R
C
= 4.7 kΩ
(2)
2. According to test diagram and design recommendations described in Section 2.2.
- 30 to 30 V
I
IN
IN
Input maximum forward current,
R
I
= 1.2 kΩ, R
C
= 4.7 kΩ
5 mA
Input maximum reverse current,
R
I
= 1.8 kΩ, R
C
= 4.7 kΩ
(2)
20 mA
V
OM
OUT Maximum output steady state voltage 2.5 V
I
OM
OUT Output current - 4 to 4 mA
T
AMB
AII
Operating ambient temperature - 25 to 85 ° C
T
J
Operating and storage junction temperature - 25 to 150 ° C
ESD
34
COM
34
IN
4
ESD
Volt Prot
Vc
COM
TO COMPARATORS
ESD
C
BIASING
CIRCUIT
ESD
12
COM
12
OPTO COUPLER DRIVER
ESD
OVER
VO LTAG E
PROTECTION
IN
1
OUT
1
I
1
I
1
1.5mA
0.75xI
LIM
0.25xI
LIM
OPTO COUPLER DRIVER
OUT
2
CURRENT LIMITER I
LIM
ESD
OVER
VO LTAG E
PROTECTION
0.25xI
LIM
0.75xI
LIM
1.5mA
I
2
CURRENT LIMITER I
LIM
I
2
IN
2
IN
3
ESD
OVER
VO LTAG E
PROTECTION
I
3
OPTO COUPLER DRIVER
0.75xI
LIM
0.25xI
LIM
CURRENT LIMITER I
LIM
OUT
3
I
3
1.5mA
0.25xI
LIM
0.75xI
LIM
ESD
OVER
VO LTAG E
PROTECTION
CURRENT LIMITER I
LIM
OPTO COUPLER DRIVER
1.5mA
I
4
OUT
4
I
4
CLT3-4B Characteristics
3/13
Table 2. Thermal resistance
Symbol Parameter Value Unit
R
th(j-a)
TSSOP20 thermal resistance junction to ambient
Board copper surface = 2 cm
2
, copper thickness = 35 µm
90 °C/W
Table 3. Electrical characteristics (T
J
= 25 °C, V
CC
= 24 V and COM pin voltage
referred unless otherwise specified)
Symbol Pin Name Conditions Min. Typ Max. Unit
Current limitation
I
LIM
IN Input limiting current
V
OUT
= 0.9 to 2.0 V
V
IN
= 5 to 27 V
T
AMB
= - 25 to 85° C
2.1 3 3.7 mA
V
LOW
IN
Maximum off state
voltage
I
IN
= 100 µA 1.5 V
V
TH
IN Activation threshold I
IN
= 2.1 mA 3.4 5 V
Input and Supply Protection
V
CL
IN Clamping voltage I
IN
= 7 mA; t
P
= 1 ms 31 38 - V
Opto-coupler driver operation
I
OFF
OUT Off state output current
V
I
= 5 V,
(1)
1. According to Figure 9: Robust application diagram on page 8 with use of a
R
I
= 1.8 kΩ resistor, and an opto-coupler (R
LED
(0 V) = 15 kΩ)
- 10 40 µA
I
IN
= 1.5 mA,
(2)
2. According to Figure 9: Robust application diagram on page 8 with use of a
R
I
= 0 kΩ resistor, and an opto-coupler (R
LED
(0 V) = 15 kΩ)
- 10 40 µA
V
OFF
OUT Off state output voltage I
IN
= 1.5 mA 0.15 0.5 V
I
ON
OUT On state output current
V
IN
= 5 V 1.5 2 - mA
V
IN
= 4.2 V, V
C
= 10 V 1.5 2 - mA
Supply and biasing circuit
V
C
V
C
Supply voltage T
AMB
= - 25 to 85° C 10 V
I
C
V
C
Supply current V
IN
= V
C
= 30 V 550 800 µA
Table 4. Switching electrical characteristics (T
J
= 25 °C, V
CC
= 24V and COM pin
voltage referred unless otherwise specified)
Symbol Pin Name Conditions Min. Typ Max. Unit
F
MAX
IN-OUT Input to output running frequency 5 kHz
t
PLH
IN-OUT Input activation propagation time C
OUT
= 22 nF 6 µs
t
PHL
IN-OUT Input de-activation propagation time C
OUT
= 22 nF 10 µs
P1-P3P4-P6P7-P9P10-P12P13-P13

CLT3-4BT6

Mfr. #:
Buy CLT3-4BT6
Manufacturer:
STMicroelectronics
Description:
Interface - Specialized Quad Digital Term
Lifecycle:
New from this manufacturer.
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