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PDF MC75174B Data sheet ( Hoja de datos )
| Número de pieza | MC75174B | |
| Descripción | Quad EIA-485 Line Drivers | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MC75174B (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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ON Semiconductort
Quad EIA−485 Line Drivers
with Three−State Outputs
The ON Semiconductor MC75172B/174B Quad Line drivers are
differential high speed drivers designed to comply with the EIA−485
Standard. Features include three−state outputs, thermal shutdown,
and output current limiting in both directions. These devices also
comply with EIA−422−A, and CCITT Recommendations V.11 and
X.27.
The MC75172B/174B are optimized for balanced multipoint bus
transmission at rates in excess of 10 MBPS. The outputs feature wide
common mode voltage range, making them suitable for party line
applications in noisy environments. The current limit and thermal
shutdown features protect the devices from line fault conditions.
These devices offer optimum performance when used with the
MC75173 and MC75175 line receivers.
Both devices are available in 16−pin plastic DIP and 20−pin wide
body surface mount packages.
• Meets EIA−485 Standard for Party Line Operation
• Meets EIA−422−A and CCITT Recommendations V.11 and X.27
• Operating Ambient Temperature: −40°C to +85°C
• High Impedance Outputs
• Common Mode Output Voltage Range: −7 to 12 V
• Positive and Negative Current Limiting
• Transmission Rates in Excess of 10 MBPS
• Thermal Shutdown at 150°C Junction Temperature, (±20°C)
• Single 5.0 V Supply
• Pin Compatible with TI SN75172/4 and NS μA96172/4
• Interchangeable with MC3487 and AM26LS31 for EIA−422−A
Applications
w These devices are available in Pb−free package(s). Specifications herein
apply to both standard and Pb−free devices. Please see our website at
www.onsemi.com for specific Pb−free orderable part numbers, or contact
your local ON Semiconductor sales office or representative.
MC75172B
MC75174B
QUAD EIA−485 LINE DRIVERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO−20L)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC75172BDW
SO−20L
MC75174BDW TA = − 40° to +85°C SO−20L
MC75174BP
Plastic DIP
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 3
1
Publication Order Number:
MC75172B/D
1 page  
MC75172B MC75174B
VCC
Vin
(0.8 or 2.0 V)
VOD2,A
VCC
RL/2 Vin
(0.8 or 2.0 V)
RL/2 VOS
VOD3
375
58
375
+
VCM = 12 to −7.0 V
Figure 1. VDD Measurement
Figure 2. Common Mode Test
VCC
Y
Vin
Z
S.G.
2.3 V
27 Ω
Output
15 pF
Vin 1.5 V
tPLH
Output Y
3.0 V
Output Z
tPHL 3.0 V
Figure 3. Propagation Delay, Single−Ended Outputs
3.0 V
1.5 V
tPHL
0V
3.0 V
tPLH
3.0 V
VOL
VOH
VCC
Vin
54 50 pF VOD
Vin 1.5 V
tPLHD
1.5 V
S.G.
VOD 50%
[4.6 V
−1.5 V
tdr
NOTES: 1. S.G. set to: f p 1.0 MHz; duty cycle = 50%; tr, tf, p 5.0 ns.
2. tSK1 = ⎥ tPLHD − tPHLD⎥ for each driver.
3. tSK2 computed by subtracting the shortest tPLHD from the longest tPLHD of the 4 drivers within a package.
4. tSK3 computed by subtracting the shortest tPHLD from the longest tPHLD of the 4 drivers within a package.
Figure 4. Propagation Delay, Differential Outputs
3.0 V
1.5 V
tPHLD
0V
1.5 V
50%
−1.5 V
tdf
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5
5 Page 
MC75172B MC75174B
Termination Resistors
Transmission line theory states that, in order to preserve
the shape and integrity of a waveform traveling along a
cable, the cable must be terminated in an impedance equal
to its characteristic impedance. In a system such as that
depicted in Figure 18, in which data can travel in both
directions, both physical ends of the cable must be
terminated. Stubs, leading to each receiver and driver,
should be as short as possible.
Leaving off the terminations will generally result in
reflections which can have amplitudes of several volts
above VCC or below ground. These overshoots and
undershoots can disrupt the driver and/or receiver
operation, create false data, and in some cases damage
components on the bus.
En
TTL D
RT
#1
R TTL R
TTL
#1 #2
5 “off” drivers (@ 0.06 U.L. each),
+8 receivers (@ 1.0 U.L. each) = 8.3 Unit Loads
RT = 120 Ω at each end of the cable.
TTL
En
D
#2
TTL
TTL
En
D
#3
R
#3
En
TTL D
#4
120 Ω
Twisted
Pair
TTL
TTL
En
D
#6
RT
R
#6
TTL
TTL R
#4
R
#8
R
#7
TTL
R
#5
TTL TTL
En
D
#5
NOTES: 1. Terminating resistors RT must be located at the physical ends of the cable.
2. Stubs should be as short as possible.
3. Circuit ground of all drivers and receivers must be connected via a dedicated wire within the cable.
Do not rely on chassis ground or power line ground.
Figure 18. Typical EIA−485 System
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11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MC75174B.PDF ] | |
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