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부품번호 OL7272 기능
기능 4-channel Differential Power Linedriver
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OL7272 데이터시트, 핀배열, 회로
www.DataSheet4U.com
OL7272
Industrial 30 Volt 4-Channel Differential Power Linedriver - Short Circuit Proof -
Applications
Industrial encoder interfacing
Industrial sensor interfacing
Proximity switches
Industrial controllers PLC
Light barriers
Features
Max. voltage range from 4,5 V – 36 V
Short circuit proof tri-state outputs drive
up to 120mA sink / source
Operating frequency up to 4 MHz
Pin compatible with ET7272
Dynamic peak current up to 1,5 Amp.
High impedance CMOS / TTL compatible
buffered inputs with hysteresis
Outputs RS422A compatible
Small package TSSOP (OL2068) available
General Description
The OL7272 is an industrial power
linedriver and contains four identical
short circuit proof differential
linedrivers up to 30 Volts driver supply
with a joint enable function.
At overload there is a thermal
shutdown feature which can be
disabled by the user.
The high data rate and immunity to
cable inductance and capacitance
makes an ideal linedriver.
The small outline SOP package gives
excellent thermal power dissipation,
thus the usage in space limited
applications is easy.
Line voltage in
Voltage regulator 5V , 5mA out
CMOS / TTL
Data input
CMOS / TTL
Data input
CMOS / TTL
Data input
CMOS / TTL
Data input
Differential
Output A
Output A -
Differential
Output B
Output B -
Differential
Output C
Output C -
Differential
Output D
Output D -
Tristate enable / disable
Thermal shutdown disable
Protection logic controller
- short circuit shut down
- Tristate and thermal logic control
- undervoltage and power up reset
- Transient and EMI protection
OPTOLAB Microsystems GmbH * Haarbergstr. 61 * 99097 Erfurt / Germany * Tel. +49-361-422906-0 * Fax +49-361-422906-50 *
www.optolab.com
Datasheet Version 1.04 May.30.2000




OL7272 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
OL7272
Industrial 30 Volt 4-Channel Differential Power Linedriver - short circuit proof -
Table 4 AC Characteristics (VCCD = 12.0 V, TA = 25 °C, Cable capacitance 1000pF, unless otherwise noted)
Parameter
Symbol
Condition
Min Typ Max Unit
Disable delay time
Enable delay time
Propagation delay from 50% point of rising
edge of input pulse to zero crossing of
differential outputs (see Figure 2)
Propagation delay from 50% point of falling
edge of input pulse to zero crossing of
differential outputs (see Figure 2)
Output rise time (see Figure 1)
Output fall time (see Figure 1)
tOFF
tON
tPLH VCCD = 5.0 V
VCCD = 12.0 V
VCCD = 24.0 V
CLOAD = 1000 pF
tPHL VCCD = 5.0 V
VCCD = 12.0 V
VCCD = 24.0 V
= 1000 pF
tR11 VCCD = 5.0 V
VCCD = 12.0 V
VCCD = 24.0 V
= 1000 pF
tF16 VCCD = 5.0 V
VCCD = 12.0 V
VCCD = 24.0 V
= 1000 pF
CLOAD
CLOAD
CLOAD
100 200.0
76 200.0
64 200.0
74 200.0
100 330.0
ns
ns
ns
ns
ns
70 280.0
80 280.0
100 330.0
ns
ns
ns
42 200.0
110 350.0
120 380.0
ns
ns
ns
32 200.0 ns
62 350.0 ns
84 380.0 ns
VIH
Input
VIL
VOH
Output
VOL
V
TH+
90%
10%
t
R
V
TH-
90%
10%
t
F
Figure 1
Definition of Output Rise and
Fall Time
VIH
Input
VIL
VOH
Output
VOL
VOH
Output-
VOL
50%
tPLH
50%
50%
tPHL
50%
tPHL
50%
50%
tPLH
VCCD
Input
1/4
OL7272
Output+
Output-
Figure 3
AC Test Circuit
CL = 1.000pF
CC
LL
Figure 2
Timing diagram with typical
asynchronous propagation delays
11 Measured from 10% to 90% of the Output signal only with capacitive load on each output pin to ground (see Figure 3).
OPTOLAB Microsystems GmbH * Haarbergstr. 61 * 99097 Erfurt / Germany * Tel. +49-361-422906-0 * Fax +49-361-422906-50 * www.optolab.com 4/9

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OL7272 전자부품, 판매, 대치품
www.DataSheet4U.com
OL7272
Industrial 30 Volt 4-Channel Differential Power Linedriver - short circuit proof -
Functional description
The main contents of this new CMOS power linedriver are four identical blocks (systems A to D) with each a CMOS/TTL
Schmitt Trigger Input ( can be driven at up to Vdd as well ) and high power differential buffered and inverted outputs.
With the low active ENABLE pin it is possible to switch off all eight outputs (high-impedance state), thus this driver can be
used in industrial bus systems.
In some rare applications it might be useful to disable the overtemperature shutdown. This can be done by setting the
ENABLE pin to a level between >7,5 V and <12 V. In this case the whole protection of the IC is disabled ! In case of any
short circuits or thermal overdrive, the driver might be destroyed !
An internal ultra low drop voltage regulator with typical 5.0 V supplies the internal logic to reduce power dissipation.
The over-temperature protection block is placed in the center of the chip. The thermal shutdown will be activated, when a
overload condition (i.e. short circuit) has exceeded the over-temperature detection threshold.
In this case automatically all output drivers are switched off. After the chip has cooled down ( a few milliseconds ) it
automatically re-activates all functions. In case the short circuit is still present, it switches off again and the same cycle
starts from the beginning.
By using this linedriver, the field returns of systems, which are accidentally shorted and blown by the endusers, are
dramatically reduced.
The OL7272 is pin compatible to a couple of popular other linedrivers like 26xx31, ET7272 etc.
Power supply
The internal power supply is designed as a voltage regulator with a typical output voltage VCCI = 5.0 V. The minimal
voltage drop across the regulator transistors could not be lower than 0.3 V.
Under-voltage reset
If the system is switched on, the status of the linedriver is, for a few microseconds, undefined. The same happens, if
heavy power supply failures occur. To avoid wrong data transmitted, there is a supply voltage watchdog implemented.
The under-voltage reset block contains a comparator. The voltage VCCI will be always compared with a reference voltage,
provided by an internal bandgap cell.
If after a filter time (tFILLVR ~ 5 µs) VCCI drops below the typical voltage threshold of 3.5 V the output signal of this block
switches off all output drivers to the high-impedance state until minimum 3.6 V are reappearing.
ESD / EMI
The chip is an ESD sensitive device and should be handled according to guideline EN100015 / part 1 („The Protection of
ESD Sensitive Devices„).
All pins are ESD protected according to ESD standard MIL883, method 3015.7 (human body model). Unused Inputs
should be connected to GND, as well as the pin ENABLE in case this function is not used. This will reduce the quiescent
supply current.
Life support clause
The schematics and in general the linedriver is not intended for use in life support appliances, critical components or
systems without the express written consent of Optolab Microsystems GmbH. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b)
support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided
in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
OPTOLAB Microsystems GmbH * Haarbergstr. 61 * 99097 Erfurt / Germany * Tel. +49-361-422906-0 * Fax +49-361-422906-50 * www.optolab.com 7/9

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부품번호상세설명 및 기능제조사
OL7272

4-channel Differential Power Linedriver

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