MC75172B [MOTOROLA]
QUAD EIA-485 LINE DRIVERS WITH THREE-STATE OUTPUTS; 具有三态输出QUAD EIA -485的线路驱动器
| 型号： | MC75172B |
| 厂家： | 
MOTOROLA |
| 描述： | QUAD EIA-485 LINE DRIVERS WITH THREE-STATE OUTPUTS |
| 文件： | 总13页 (文件大小：189K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by MC75172B/D
The Motorola 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.
QUAD EIA–485 LINE DRIVERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
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
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
• Transmission Rates in Excess of 10 MBPS
• Thermal Shutdown at 150°C Junction Temperature, (±20°C)
• Single 5.0 V Supply
ORDERING INFORMATION
Operating
Temperature Range
Device
Package
• Pin Compatible with TI SN75172/4 and NS µA96172/4
MC75172BDW
MC75174BDW
MC75174BP
SO–20L
SO–20L
• Interchangeable with MC3487 and AM26LS31 for EIA–422–A
T
A
= –40° to +85°C
Applications
Plastic DIP
PIN CONNECTIONS
MC75172B
MC75174B
1A
1Y
1
2
3
4
5
6
7
8
16
15
V
1A
1
2
3
4
5
6
7
8
9
20
19
18
17
V
CC
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
1A
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC
1A
1Y
1Z
V
CC
4A
1Y
NC
1Z
4A
4Y
NC
1Y
4A
4Y
NC
4Z
4A
4Y
4Z
1Z
14 4Y
NC
En
12
2Z
1Z
13
12
11
10
9
En
4Z
En
3Z
3Y
3A
En
12
2Z
En
2Z
16 4Z
15
En
34
2Z
En
34
En
2Y
2Y
3Z
3Y
3A
NC
2Y
2A
14 3Z
13 NC
12 3Y
11 3A
NC
2Y
2A
14 3Z
13 NC
12 3Y
11 3A
2A
2A
Gnd
Gnd
P Package
P Package
Gnd 10
Gnd 10
DW Package
DW Package
Motorola, Inc. 1996
Rev 1
MC75172B MC75174B
MAXIMUM RATINGS
Rating
Symbol
Value
–0.5, +7.0
+7.0
Unit
Vdc
Vdc
mA
Power Supply Voltage
V
CC
Input Voltage (Data, Enable)
V
in
Input Current (Data, Enable)
I
in
–24
Applied Output Voltage, when in 3–State Condition
V
za
–10, +14
Vdc
(V
CC
= 5.0 V)
Applied Output Voltage, when V
Output Current
= 0 V
V
±14
CC
zb
O
I
Self–Limiting
–65, +150
–
Storage Temperature
T
stg
°C
Devices should not be operated at these limits. The “Recommended Operating Conditions” table provides
for actual device operation.
RECOMMENDED OPERATING CONDITIONS
Characteristic
Symbol
Min
+4.75
0
Typ
+5.0
–
Max
Unit
Vdc
Vdc
Vdc
mA
°C
Power Supply Voltage
V
CC
+5.25
Input Voltage (All Inputs)
V
in
V
CC
Output Voltage in 3–State Condition, or when V
Output Current (Normal data transmission)
= 0 V
V
cm
–7.0
–65
–
+12
+65
CC
I
O
–
Operating Ambient Temperature (see text)
T
A
EIA–485
EIA–422
–40
0
–
–
+85
+85
All limits are not necessarily functional concurrently.
ELECTRICAL CHARACTERISTICS (–40°C
T
A
85°C, 4.75 V
V
5.25 V, unless otherwise noted.)
CC
Symbol
Characteristic
Min
Typ
Max
Unit
Output Voltage
Single–Ended Voltage
Vdc
I
= 0
V
0
–
–
–
4.0
1.6
6.0
–
–
O
O
High @ I = –33 mA
Low @ I = +33 mA
O
Differential Voltage
V
V
O
OH
OL
Open Circuit (I = 0)
V
OD1
V
OD2
1.5
1.5
3.4
2.3
6.0
5.0
O
R
= 54 Ω (Figure 1)
L
Change in Differential*, R = 54 Ω (Figure 1)
∆V
V
OD2A
–
–
–
1.5
–
–
5.0
2.2
5.0
–
5.0
2.9
5.0
200
–
200
5.0
200
–
mVdc
Vdc
mVdc
Vdc
mVdc
Vdc
mVdc
L
OD2
Differential Voltage, R = 100 Ω (Figure 1)
L
Change in Differential*, R = 100 Ω (Figure 1)
∆V
V
∆V
V
L
OD2A
OD3
OD3
OS
Differential Voltage, –7.0 V
Change in Differential*, –7.0 V
Offset Voltage, R = 54 Ω (Figure 1)
V
12 V (Figure 2)
12 V (Figure 2)
cm
V
cm
L
Change in Offset*, R = 54 Ω (Figure 1)
∆V
–
200
L
OS
Output Current (Each Output)
Power Off Leakage, V
Leakage in 3–State Mode, –7.0 V
= 0, –7.0 V
V
12 V
12 V
I
–50
–50
0
0
+50
+50
µA
CC
O
O(off)
I
OZ
V
O
Short Circuit Current to Ground
Short Circuit Current, –7.0 V
I
–150
–250
–
–
+150
+250
mA
OSR
I
OS
V
12 V
O
*V switched from 0.8 to 2.0 V.
in
Typical values determined at 25°C ambient and 5.0 V supply.
2
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
ELECTRICAL CHARACTERISTICS (–40°C
T
A
85°C, 4.75 V
V
5.25 V, unless otherwise noted.)
CC
Characteristics
Symbol
Min
Typ
Max
Unit
Inputs
Vdc
Low Level Voltage (Pins 4 & 12, MC75174B only)
Low Level Voltage (All Other Pins)
High Level Voltage (All Inputs)
V
V
V
0
0
2.0
–
–
–
0.7
0.8
IL(A)
IL(B)
IH
V
CC
Current @ V = 2.7 V (All Inputs)
Current @ V = 0.5 V (All Inputs)
in
I
I
–
–100
0.2
–15
20
–
µA
in
IH
IL
Clamp Voltage (All Inputs, I = –18 mA)
in
V
–1.5
–
–
–
–
Vdc
°C
IK
Thermal Shutdown Junction Temperature
T
jts
+150
Power Supply Current (Outputs Open, V
Outputs Enable
Outputs Disabled
= 5.25 V)
I
mA
CC
CC
–
–
60
30
70
40
TIMING CHARACTERISTICS (T = 25°C, V
= 5.0 V)
CC
A
Characteristics
Symbol
Min
Typ
Max
Unit
Propagation Delay – Input to Single–ended Output (Figure 3)
Output Low–to–High
Output High–to–Low
ns
t
t
–
–
23
18
30
30
PLH
PHL
Propagation Delay – Input to Differential Output (Figure 4)
Input Low–to–High
Input High–to–Low
ns
t
t
–
–
15
17
25
25
PLH(D)
PHL(D)
Differential Output Transition Time (Figure 4)
Skew Timing
t , t
dr df
–
19
25
ns
ns
t
– t
for Each Driver
Within a Package
Within a Package
t
t
t
–
–
–
0.2
1.5
1.5
–
–
–
PLHD PHLD
SK1
SK2
SK3
Max – Min t
Max – Min t
PLHD
PHLD
Enable Timing
ns
Single–ended Outputs (Figure 5)
Enable to Active High Output
Enable to Active Low Output
t
t
t
t
–
–
–
–
–
–
–
–
48
20
35
30
58
28
38
36
60
30
45
50
70
35
50
50
PZH(E)
PZL(E)
PHZ(E)
t
Active High to Disable (using Enable)
Active Low to Disable (using Enable)
Enable to Active High Output (MC75172B only)
Enable to Active Low Output (MC75172B only)
Active High to Disable (using Enable, MC75172B only)
Active Low to Disable (using Enable, MC75172B only)
t
PLZ(E)
PZH(E)
t
PZL(E)
PHZ(E)
t
PLZ(E)
Differential Outputs (Figure 6)
ns
Enable to Active Output
Enable to Active Output (MC75172B only)
Enable to 3–State Output
t
t
t
t
–
–
–
–
47
56
32
40
–
–
–
–
PZD(E)
PZD(E)
PDZ(E)
PDZ(E)
Enable to 3–State Output (MC75172B only)
3
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
Figure 1. V
Measurement
Figure 2. Common Mode Test
DD
V
CC
V
CC
375
375
R /2
L
V
in
(0.8 or 2.0 V)
V
OD3
V
in
(0.8 or 2.0 V)
58
V
+
OD2,A
V
= 12 to –7.0 V
CM
R /2
L
V
OS
Figure 3. Propagation Delay, Single–Ended Outputs
3.0 V
1.5 V
1.5 V
V
in
V
2.3 V
27
0 V
CC
t
PLH
t
PHL
Y
Ω
V
in
Output
Z
3.0 V
15 pF
3.0 V
3.0 V
Output Y
Output Z
V
V
OL
S.G.
t
PLH
OH
3.0 V
t
PHL
Figure 4. Propagation Delay, Differential Outputs
3.0 V
V
CC
1.5 V
1.5 V
V
in
0 V
V
t
PLHD
in
V
50 pF
OD
54
t
PHLD
1.5 V
50%
–1.5 V
1.5 V
50%
–1.5 V
V
4.6 V
OD
S.G.
t
df
t
dr
NOTES: 1. S.G. set to: f
1.0 MHz; duty cycle = 50%; t , t ,
– t for each driver.
5.0 ns.
r
f
2. t
3. t
4. t
=
t
SK1
SK2
SK3
PLHD PHLD
computed by subtracting the shortest t
computed by subtracting the shortest t
from the longest t
from the longest t
of the 4 drivers within a package.
of the 4 drivers within a package.
PLHD
PHLD
PLHD
PHLD
4
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
Figure 5. Enable Timing, Single–Ended Outputs
3.0 V
1.5 V
V
CC
1.5 V
V
in
0 V
0 or 3.0 V
t
PZH(E)
V
Ω
out
t
PHZ(E)
110
50 pF
V
in
3.0 V
V
OH
0.5 V
2.3 V
V
out
S.G.
V
CC
V
3.0 V
CC
1.5 V
1.5 V
110
Ω
V
in
0 V
0 or 3.0 V
t
PZL(E)
V
out
t
PLZ(E)
50 pF
V
3.0 V
in
V
out
2.3 V
0.5 V
V
OL
S.G.
Figure 6. Enable Timing, Differential Outputs
3.0 V
V
CC
1.5 V
1.5 V
V
in
0 V
t
PZD(E)
0 or 3.0 V
V
50 pF
54
OD
t
PDZ(E)
V
in
3.0 V
1.5 V
1.5 V
V
OD
0
0
S.G.
Disabled
Disabled
Active
NOTES: 1. S.G. set to: f
1.0 MHz; duty cycle = 50%; t , t ,
5.0 ns.
f
f
2. V is inverted for Enable measurements.
in
5
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
Figure 7. Single–Ended Output Voltage
versus Output Sink Current
Figure 8. Single–Ended Output Voltage
versus Temperature
2.0
2.0
1.5
1.0
0.5
0
I
= 27.8 mA
OL
1.75
I
= 20.0 mA
OL
1.5
1.25
1.0
4.75 V
V
5.25 V
CC
4.75V
V
5.25 V
CC
T
= 25°C
A
–40
–20
0
20
40
60
85
85
85
0
10
20
I
30
40
50
60
70
–70
70
T , AMBIENT TEMPERATURE (
°
C)
, OUTPUT CURRENT (mA)
A
OL
Figure 9. Single–Ended Output Voltage
versus Output Source Current
Figure 10. Single–Ended Output
Voltage versus Temperature
5.0
4.0
V
= 5.25 V
CC
4.0
I
= –20.0 mA
OH
V
= 5.00 V
CC
3.75
I
= –27.8 mA
OH
V
= 4.75 V
CC
3.0
2.0
1.0
3.5
V
= 4.75 V
T
= 25
–60
°C
CC
A
3.25
0
–10
–20
–30
–40
–50
–40
–20
0
20
40
60
I
, OUTPUT CURRENT (mA)
T , AMBIENT TEMPERATURE (
°C)
OH
A
Figure 11. Output Differential Voltage
versus Load Current
Figure 12. Output Differential Voltage
versus Temperature
4.0
3.0
2.0
1.0
4.0
3.0
V
= 5.25 V
CC
I
= 20.0 mA
O
V
= 5.0 V
I
= 27.8 mA
CC
O
2.0
1.0
0
V
= 4.75 V
CC
T
= 25°C
A
0.8 or
2.0 V
I
0.8 or
2.0 V
O
V
I
OD
V
O
V
= 4.75 V
OD
CC
0
–40
–20
0
20
40
60
0
10
20
I
30
40
50
60
T , AMBIENT TEMPERATURE (°C)
, OUTPUT CURRENT (mA)
A
O
6
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
Figure 13. Output Leakage Current
versus Output Voltage
Figure 14. Output Leakage Current
versus Temperature
2.0
1.0
20
15
10
5.0
V
= +12 V
= 7.0 V
out
0
–1.0
–2.0
0
V
out
–5.0
–10
–15
–20
T
= 25°C
En = Low, En = High
A
En = Low, En = High
or V
= 0 V
CC
–7.0
–3.0
1.0
5.0 9.0
12
–40
–20
0
20
40
60
85
V , APPLIED OUTPUT VOLTAGE (V)
z
T , AMBIENT TEMPERATURE (°C)
A
Figure 15. Input Current
versus Input Voltage
Figure 16. Short Circuit Current
versus Common Mode Voltage
5.0
0
150
90
Normally Low Output
Enable
Pins
Driver
Inputs
–5.0
–10
–15
–20
–25
30
0
Normally High Output
–30
4.75
VCC
°C
5.25 V
T
= 25
A
–90
T
= 25°C
A
4.75
VCC
5.25 V
12
–150
–0.5
0.5
1.5
2.5
3.5
4.5
5.5
–7.0
–3.0
1.0
5.0
9.0
V
, INPUT VOLTAGE (V)
V , APPLIED OUTPUT VOLTAGE (V)
in
z
7
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
APPLICATIONS INFORMATION
Description
The MC75172B and MC75174B are differential line drivers
designed to comply with EIA–485 Standard (April 1983) for
use in balanced digital multipoint systems containing multiple
drivers. The drivers also comply with EIA–422–A and CCITT
Recommendations V.11 and X.27. The drivers meet the
EIA–485 requirement for protection from damage in the event
that two or more drivers attempt to transmit data
simultaneoulsy on the same cable. Data rates in excess of 10
MBPS are possible, depending on the cable length and cable
characteristics. A single power supply, 5.0 V, ±5%, is required
at a nominal current of 60 mA, plus load currents.
The drivers are protected from short circuits by two
methods:
a) Current limiting is provided at each output, in both the
source and sink direction, for shorts to any voltage
within the range of 12V to –7.0V, with respect to circuit
ground(seeFigure16).Theshortcircuitcurrentwillflow
until the fault is removed, or until the thermal shutdown
circuit activates (see below). The current limiting circuit
has a negative temperature coefficient and requires no
resetting upon removal of the fault condition.
Outputs
b) A thermal shutdown circuit disables the outputs when
the junction temperature reaches 150°C, ±20°C. The
thermal shutdown circuit has a hysteresis of ≈ 12°C to
prevent oscillations. When this circuit activates, the
output stage of each driver is put into the high
impedance mode, thereby shutting off the output
currents. The remainder of the internal circuitry remains
biased. The outputs will become active once again as
the IC cools down.
Each output (when active) will be a low or a high voltage,
which depends on the input state and the load current (see
Table 1, 2 and Figures 7 to 10). The graphs apply to each
driver, regardless of how many other drivers within the
package are supplying load current.
Table 1. MC75172B Truth Table
Enables
Outputs
EN
EN
Y
Z
Data Input
Driver Inputs
H
L
H
L
H
H
X
X
L
X
X
L
L
H
H
L
H
L
L
H
L
H
Z
The driver inputs determine the state of the outputs in
accordance with Tables 1 and 2. The driver inputs have a
nominal threshold of 1.2 V, and their voltage must be kept
within the range of 0 V to V
for proper operation. If the
X
Z
CC
voltage is taken more than 0.5 V below ground, excessive
currents will flow, and proper operation of the drivers will be
affected. An open pin is equivalent to a logic high, but good
design practices dictate that inputs should never be left open.
The characteristics of the driver inputs are shown in Figure
15. This graph is not affected by the state of the Enable pins.
Table 2. MC75174B Truth Table
Outputs
Y
Z
Data Input
Enable
H
L
X
H
H
L
H
L
Z
L
H
Z
Enable Logic
Each driver’s outputs are active when the Enable inputs
(Pins 4 and 12) are true according to Tables 1 and 2.
The Enable inputs have a nominal threshold of 1.2 V and
H = Logic high, L = Logic low, X = Irrelevant, Z = High impedance
their voltage must be kept within the range of 0 V to V
for
CC
The two outputs of a driver are always complementary. A
“high” output can only source current out, while a “low” output
can only sink current (except for short circuit current – see
Figure 16).
proper operation. If the voltage is taken more than 0.5 V
below ground, excessive currents will flow, and proper
operation of the drivers will be affected. An open pin is
equivalent to a logic high, but good design practices dictate
that inputs should never be left open. The Enable input
characteristics are shown in Figure 15.
The outputs will be in the high impedance mode when:
a) the Enable inputs are set according to Table 1 or 2;
Operating Temperature Range
The minimum ambient operating temperature is listed as
–40°C to meet EIA–485 specifications, and 0°C to meet
EIA–422–A specifications. The higher V
EIA–422–A is the reason for the narrower temperature range.
b) V
is less than 1.5 V;
CC
c) the junction temperature exceeds the trip point of the
thermal shutdown circuit (see below). When in this
condition, the output’s source and sink capability are
shut off, and only leakage currents will flow (see
Figures 13, 14). Disabled outputs may be taken to any
voltage between –7.0 V and 12 V without damage.
required by
OD
8
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
The maximum ambient operating temperature (applicable
reducing the load current, reducing the ambient temperature,
and/or providing a heat sink.
to both EIA–485 and EIA–422–A) is listed as 85°C. However,
a lower ambient may be required depending on system use
(i.e. specifically how many drivers within a package are used)
and at what current levels they are operating. The maximum
power which may be dissipated within the package is
determined by:
System Requirements
EIA–485 requires each driver to be capable of transmitting
data differentially to at least 32 unit loads, plus an equivalent
DC termination resistance of 60Ω, over a common mode
voltage of –7.0 to 12 V. A unit load (U.L.), as defined by
EIA–485, is shown in Figure 17.
T
–T
Jmax
R
A
PD
max
JA
Figure 17. Unit Load Definition
where:
R
= package thermal resistance (typical
θJA
I
70°C/W for the DIP package, 85°C/W for SOIC
package);
1.0 mA
T
= max. operating junction
Jmax
temperature, and
T = ambient temperature.
–3.0 V
–7.0 V
A
V
Since the thermal shutdown feature has a trip point of
150°C, ±20°C, T is selected to be 130°C. The power
12 V
5.0 V
Jmax
dissipated within the package is calculated from:
–0.8 mA
PD
= {[(V
– V
) • I ] + V
OH
• I )} each driver
OL OL
CC
= + (V
OH
Reprinted from EIA–485, Electronic Industries Association,
Washington,DC.
• I
)
CC CC
where:
V
V
= the supply voltage;
, V
OH OL
CC
are measured or estimated from
A load current within the shaded regions represents an
impedance of less than one U.L., while a load current of a
magnitude outside the shaded area is greater than one U.L.
A system’s total load is the sum of the unit load equivalents
of each receiver’s input current, and each disabled driver’s
output leakage current. The 60Ω termination resistance
mentioned above allows for two 120Ω terminating resistors.
Using the EIA–485 requirements (worst case limits), and
the graphs of Figures 7 and 9, it can be determined that the
maximum current an MC75172B or MC75174B driver will
source or sink is 65 mA.
Figures 7 to 10;
= the quiescent power supply current
I
CC
(typical 60 mA).
As indicated in the equation, the first term (in brackets)
must be calculated and summed for each of the four drivers,
while the last term is common to the entire package.
Example 1: T = 25°C, I
= I
= 55 mA for each driver,
A
OL OH
V
= 5.0 V, DIP package. How many drivers per package
CC
can be used?
Maximum allowable power dissipation is:
System Example
130°C 25°C
PD
1.5 W
An example of a typical EIA–485 system is shown in
Figure 18. In this example, it is assumed each receiver’s input
characteristics correspond to 1.0 U.L. as defined in Figure 17.
Each “off” driver, with a maximum leakage of ±50 µA over the
common mode range, presents a load of 0.06 U.L. The
total load for the active driver is therefore 8.3 unit loads, plus
the parallel combination of the two terminating resistors
(60Ω). It is up to the system software to control the driver
Enable pins to ensure that only one driver is active at any
time.
max
70°C W
Since the power supply current of 60 mA dissipates
300 mW, that leaves 1.2 W (1.5 W – 0.3 W) for the drivers.
From Figures 7 and 9, V
power dissipated in each driver is:
1.75 V, and V
3.85 V. The
OL
OH
{(5.0 – 3.85) • 0.055} + (1.75 • 0.055) = 160 mW.
Since each driver dissipates 160 mW, the four drivers per
package could be used in this application
Example2:T =85°C,I =27.8mA,I
OL
=20mAforeach
= 5.0 V, SOIC package. How many drivers per
A
OH
driver, V
Termination Resistors
CC
package can be used?
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
Maximum allowable power dissipation is:
130°C 85°C
PD
0.53 W
max
85°C W
Since the power supply current of 60 mA dissipates
300 mW, that leaves 230 mW (530 mW – 300 mW) for the
drivers. From Figures 8 and 10 (adjusted for V
= 5.0 V),
4.27 V. The power dissipated in
CC
V
1.38 V, and V
OH
OL
each driver is:
V
or below ground. These overshoots and undershoots
CC
can disrupt the driver and/or receiver operation, create false
data, and in some cases damage components on the bus.
{(5.0 – 4.27) • 0.020} + (1.38 • 0.0278) = 53 mW
Since each driver dissipates 53 mW, the use of all four
drivers in a package would be marginal. Options include
9
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
Figure 18. Typical EIA–485 System
En
R
R
D
TTL
TTL
TTL
#1
#2
#3
En
#1
TTL
D
R
T
120
Ω
Twisted
Pair
En
#2
5 “off” drivers (@ 0.06 U.L. each),
+8 receivers (@ 1.0 U.L. each) = 8.3 Unit Loads
TTL
D
R
T
= 120 Ω at each end of the cable.
R
TTL
#3
En
D
TTL
TTL
#4
R
#4
TTL
R
#6
En
TTL
D
R
T
#6
R
En
#5
R
R
TTL
TTL
TTL
TTL
D
#8
#7
#5
NOTES: 1. Terminating resistors R must be located at the physical ends of the cable.
T
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.
10
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
Comparing System Requirements
Characteristic
Symbol
EIA–485
EIA–422–A
V.11 and X.27
GENERATOR (DRIVER)
Output Impedance (Note 1)
Z
out
Not Specified
100 Ω
50 10 100 Ω
Open Circuit Voltage
Differential
Single–Ended
V
OCD
V
OCS
1.5 to 6.0 V
6.0 V
6.0 V
6.0 V
6.0 V, w/3.9 kΩ, Load
6.0 V, w/3.9 kΩ, Load
Loaded Differential Voltage
V
OD
1.5 to 5.0 V, w/54 Ω load
2.0 V or
0.5
2.0 V or
w/100 Ω load
0.5 V
,
OCD
V
, w/100 Ω load
OCD
Differential Voltage Balance
Output Common Mode Range
Offset Voltage
∆V
200 mV
400 mV
400 mV
Not Specified
3.0 V
OD
V
CM
–7.0 to +12 V
Not Specified
3.0 V
V
OS
–1.0
200 mV
250 mA for –7.0 to
V
3.0 V
OS
Offset Voltage Balance
Short Circuit Current
∆V
400 mV
400 mV
OS
I
150 mA to ground
150 mA to ground
OS
12 V
Leakage Current (V
CC
= 0)
I
Not Specified
100 µA to –0.25 V
thru 6.0 V
100 µA to ± 0.25 V
OLK
Output Rise/Fall Time (Note 2)
t , t
r f
0.3 T , w/54 Ω/1150 pF
load
0.1 T or
B
w/100 Ω load
20 ns,
0.1 T
B or
w/100 Ω load
B
20 ns,
RECEIVER
Input Sensitivity
V
± 200 mV
± 200 mV
3.0 V
± 300 mV
3.0 V
th
Input Bias Voltage
V
bias
3.0 V
Input Common Mode Range
Dynamic Input Impedance
V
–7.0 to 12 V
Spec number of U.L.
–7.0 to 7.0 V
4 kΩ
–7.0 to 7.0 V
4 kΩ
cm
R
in
NOTES: 1. Compliance with V.11 and X.27 (Blue book) output impedance requires external resistors in series with the outputs of the MC75172B and MC75174B.
2. T = Bit time.
B
Additional Information
Copies of the EIA Recommendations (EIA–485 and EIA–422–A) can be obtained from the Electronics Industries Association,
Washington, D.C. (202–457–4966). Copies of the CCITT Recommendations (V.11 and X.27) can be obtained from the United
States Department of Commerce, Springfield, VA (703–487–4600).
11
MOTOROLA ANALOG IC DEVICE DATA
MC75172B MC75174B
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
NOTES:
–A–
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
1
9
8
B
S
INCHES
MILLIMETERS
DIM
A
B
C
D
F
MIN
MAX
0.770
0.270
0.175
0.021
0.70
MIN
18.80
6.35
3.69
0.39
1.02
MAX
19.55
6.85
4.44
0.53
1.77
F
0.740
0.250
0.145
0.015
0.040
C
L
SEATING
PLANE
–T–
G
H
J
K
L
0.100 BSC
0.050 BSC
2.54 BSC
1.27 BSC
K
M
0.008
0.015
0.130
0.305
10
0.21
0.38
3.30
7.74
10
H
J
0.110
0.295
0
2.80
7.50
0
G
D 16 PL
M
S
0.020
0.040
0.51
1.01
M
M
0.25 (0.010)
T A
DW SUFFIX
PLASTIC PACKAGE
CASE 751D–04
(SO–20L)
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
–A–
ISSUE E
20
11
4. MAXIMUM MOLD PROTRUSION 0.150
(0.006) PER SIDE.
5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D
DIMENSION AT MAXIMUM MATERIAL
CONDITION.
10X P
–B–
M
M
0.010 (0.25)
B
1
10
J
MILLIMETERS
INCHES
20X D
DIM
A
B
C
D
F
G
J
K
M
P
MIN
12.65
7.40
2.35
0.35
0.50
MAX
12.95
7.60
2.65
0.49
0.90
MIN
MAX
0.510
0.299
0.104
0.019
0.035
0.499
0.292
0.093
0.014
0.020
M
S
S
0.010 (0.25)
T
A
B
F
R X 45
1.27 BSC
0.050 BSC
0.25
0.10
0
0.32
0.25
7
0.010
0.004
0
0.012
0.009
7
C
10.05
0.25
10.55
0.75
0.395
0.010
0.415
0.029
SEATING
PLANE
–T–
R
M
18X G
K
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