Datasheet MC75174BP, MC75174BDW, MC75172BDWR2, MC75174BDWR2 Datasheet (MOTOROLA)

Order this document by MC75172B/D

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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.

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, (±

• 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

ā

20°C)



QUAD EIA–485 LINE DRIVERS

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 648

DW SUFFIX

PLASTIC PACKAGE

CASE 751D

(SO–20L)

ORDERING INFORMATION

Operating

Device

MC75172BDW
MC75174BDW SO–20L
MC75174BP Plastic DIP

Temperature Range

TA = –40° to +85°C

Package

SO–20L

MC75172B MC75174B

1A
1Y
1Z
En
2Z
2Y
2A

Gnd

1
2
3
4
5
6
7
8

P Package

16
15
14
13
12
11
10

V
4A
4Y
4Z
En
3Z
3Y

9

3A

MOTOROLA ANALOG IC DEVICE DATA

1

1A

CC

2

1Y

3

NC

4

1Z NC

5

En

6

2Z

7

NC

8

2Y

9

2A

10 11

Gnd

DW Package

PIN CONNECTIONS

20
19
18
17
16
15
14
13
12

V
4A

4Y

4Z
En
3Z
NC
3Y
3A

CC

1A
1Y
1Z

En

12

2Z
2Y
2A

Gnd

1
2
3
4
5
6
7
8

1

1A

16

V

CC

2

1Y

15

4A

3

NC

14

4Y

4

1Z

13

4Z

En

5

En

12

12

34

2Z

11
10

9

P Package

 Motorola, Inc. 1996 Rev 1

6

3Z

7

NC

3Y

2Y

8

3A

9

2A

10 11

Gnd

DW Package

20
19
18
17
16
15
14
13
12

V
4A
4Y
NC
4Z

En
34

3Z
NC
3Y
3A

CC

1

MC75172B MC75174B

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V
Input Voltage (Data, Enable) V
Input Current (Data, Enable) I
Applied Output Voltage, when in 3–State Condition

(VCC = 5.0 V)
Applied Output Voltage, when VCC = 0 V V
Output Current I
Storage Temperature T

Devices should not be operated at these limits. The “Recommended Operating Conditions” table provides
for actual device operation.

CC

in

in

V

za

zb

O

stg

RECOMMENDED OPERATING CONDITIONS

Characteristic Symbol Min Typ Max Unit

Power Supply Voltage V
Input Voltage (All Inputs) V
Output Voltage in 3–State Condition, or when VCC = 0 V V
Output Current (Normal data transmission) I
Operating Ambient Temperature (see text)

EIA–485

EIA–422

All limits are not necessarily functional concurrently.

–0.5, +7.0 Vdc

+7.0 Vdc

–24 mA

–10, +14 Vdc

±14

Self–Limiting –

–65, +150 °C

CC

in

cm

O

T

A

+4.75 +5.0 +5.25 Vdc

0 – V

–7.0 – +12 Vdc

–65 – +65 mA

–40

0

–
–

CC

+85
+85

Vdc

°C

ELECTRICAL CHARACTERISTICS (–40°C

Characteristic Symbol Min Typ Max Unit

Output Voltage

Single–Ended Voltage

IO = 0
High @ IO = –33 mA
Low @ IO = +33 mA

Differential Voltage

Open Circuit (IO = 0)
RL = 54 Ω (Figure 1)

Change in Differential*, RL = 54 Ω (Figure 1)

Differential Voltage, RL = 100 Ω (Figure 1)

Change in Differential*, RL = 100 Ω (Figure 1)

Differential V oltage, –7.0 V p Vcm p 12 V (Figure 2)

Change in Differential*, –7.0 V p Vcm p12 V (Figure 2)

Offset Voltage, RL = 54 Ω (Figure 1)

Change in Offset*, RL = 54 Ω (Figure 1)
Output Current (Each Output)

Power Off Leakage, VCC = 0, –7.0 V p VO p 12 V

Leakage in 3–State Mode, –7.0 V p VO p 12 V

Short Circuit Current to Ground

Short Circuit Current, –7.0 V p VO p 12 V

*Vin switched from 0.8 to 2.0 V.
Typical values determined at 25°C ambient and 5.0 V supply.

p

TA p 85°C, 4.75 V p VCC p 5.25 V, unless otherwise noted.)

V

V

V

V

OD1

V

OD2

∆V
V

OD2A

∆V

OD2A

V

OD3

∆V

V

∆VOS

I

O(off)

I

OZ

I

OSR

I

OS

O
OH
OL

OD2

OD3
OS













0
–
–

1.5

1.5
–

–
–

1.5
–
–
–

–50
–50

–150
–250

–

4.0

1.6

3.4

2.3

5.0

2.2

5.0
–

5.0

2.9

5.0

0
0

–
–

6.0
–
–

6.0

5.0

200

–

200

5.0

200

–

200

+50
+50

+150
+250

Vdc

mVdc

Vdc

mVdc

Vdc

mVdc

Vdc

mVdc

µA

mA

2

MOTOROLA ANALOG IC DEVICE DATA

MC75172B MC75174B

ELECTRICAL CHARACTERISTICS (–40°C

Characteristics

Inputs

Low Level Voltage (Pins 4 & 12, MC75174B only)
Low Level Voltage (All Other Pins)
High Level Voltage (All Inputs)

Current @ Vin = 2.7 V (All Inputs)
Current @ Vin = 0.5 V (All Inputs)

Clamp Voltage (All Inputs, Iin = –18 mA) V
Thermal Shutdown Junction Temperature T
Power Supply Current (Outputs Open, VCC = 5.25 V)

Outputs Enable

Outputs Disabled

TIMING CHARACTERISTICS (T

Characteristics

Propagation Delay – Input to Single–ended Output (Figure 3)

Output Low–to–High

Output High–to–Low
Propagation Delay – Input to Differential Output (Figure 4)

Input Low–to–High

Input High–to–Low
Differential Output Transition T ime (Figure 4) tdr, t
Skew Timing

t

– t

PLHD

Max – Min t

Max – Min t
Enable Timing

Single–ended Outputs (Figure 5)

Enable to Active High Output
Enable to Active Low Output
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
Active Low to Disable (using Enable

Differential Outputs (Figure 6)

Enable to Active Output
Enable

to Active Output (MC75172B only)
Enable to 3–State Output
Enable

to 3–State Output (MC75172B only)



for Each Driver

PHLD

Within a Package

PLHD

Within a Package

PHLD

= 25°C, VCC = 5.0 V)

A

, MC75172B only)

, MC75172B only)

p

TAp

85°C, 4.75 V p VCC p 5.25 V, unless otherwise noted.)

Symbol Min Typ Max Unit

V
V

Symbol Min Typ Max Unit

t

PLH(D)

t

PHL(D)

t

PZH(E)

t

PZL(E)

t

PHZ(E)

t

PLZ(E)

t

PZH(E)

t

PZL(E)

t

PHZ(E)

t

PLZ(E)

t

PZD(E)

t

PZD(E)

t

PDZ(E)

t

PDZ(E)

IL(A)
IL(B)

V

I

IH

I

I

CC

t

PLH

t

PHL

t

SK1

t

SK2

t

SK3

0
0

IH

IL

IK

jts

df

2.0
–

–100

–1.5 – – Vdc

– +150 – °C

–
–

–
–

–
–

– 19 25 ns

–
–
–

–
–
–
–
–
–
–
–

–
–
–
–

–
–
–

0.2

–15

60
30

23
18

15
17

0.2

1.5

1.5

48
20
35
30
58
28
38
36

47
56
32
40

0.7

0.8

V

CC

20

–

70
40

30
30

25
25

–
–
–

60
30
45
50
70
35
50
50

–
–
–
–

Vdc

µA

mA

ns

ns

ns

ns

ns

MOTOROLA ANALOG IC DEVICE DATA

3

V

(0.8 or 2.0 V)

in

V

in

S.G.

MC75172B MC75174B

Figure 1. VDD Measurement Figure 2. Common Mode T est

V

V

in

1.5 V
t

PLH

t

PHL

CC

3.0 V

3.0 V

V

OD3

375

58

375

3.0 V

V

CC

RL/2

V

OD2,A

RL/2

V

OS

(0.8 or 2.0 V)

Figure 3. Propagation Delay , Single–Ended Outputs

V

V

CC

Y

2.3 V
27

Ω

Output

Z

15 pF

in

Output Y

Output Z

+

VCM = 12 to –7.0 V

1.5 V

t

PHL

3.0 V

t

PLH

3.0 V

0 V

V

OL

V

OH

Figure 4. Propagation Delay , Differential Outputs

V

CC

V

in

54

S.G.

NOTES: 1. S.G. set to: f p 1.0 MHz; duty cycle = 50%; tr, tf, p5.0 ns.

2.t

= t

SK1

3.t

computed by subtracting the shortest t

SK2

4.t

computed by subtracting the shortest t

SK3

PLHD

– t

PHLD

 for each driver.

50 pF

V

OD

from the longest t

PLHD

from the longest t

PHLD

3.0 V

1.5 V

V

in

t

PLHD

1.5 V

V

OD

50%

[

4.6 V

–1.5 V

t

dr

of the 4 drivers within a package.

PLHD

of the 4 drivers within a package.

PHLD

1.5 V

t

PHLD

t

df

0 V

1.5 V
50%

–1.5 V

4

MOTOROLA ANALOG IC DEVICE DATA

MC75172B MC75174B

Figure 5. Enable Timing, Single–Ended Outputs

0 or 3.0 V

V

in

3.0 V

0 or 3.0 V

V

3.0 V

in

S.G.

S.G.

V

CC

V

V

out

out

1.5 V
t

PZH(E)

1.5 V

t

PZL(E)

2.3 V

2.3 V

V

in

V

out

110

50 pF

V

CC

110

Ω

50 pF

Ω

V

CC

V

in

V

out

3.0 V

1.5 V

3.0 V

1.5 V

t

PHZ(E)

t

PLZ(E)

0 V

0 V

0.5 V

0.5 V

V

OH

V

OL

Figure 6. Enable Timing, Differential Outputs

V

CC

0 or 3.0 V

V

in

3.0 V

S.G.

NOTES: 1. S.G. set to: f p 1.0 MHz; duty cycle = 50%; tf, tf, p 5.0 ns.

2.Vin is inverted for Enable

54

measurements.

50 pF

V

V

OD

3.0 V

1.5 V

in

t

PZD(E)

V

OD

0

Disabled

1.5 V

Active

1.5 V

t

PDZ(E)

0 V

1.5 V
0

Disabled

MOTOROLA ANALOG IC DEVICE DATA

5

MC75172B MC75174B

Figure 7. Single–Ended Output V oltage

versus Output Sink Current

2.0

1.5

1.0

, OUTPUT VOL TAGE (V)

OL

0.5

V

4.75V pVCCp

°

C

TA = 25

0

02010 30 40 50 60 70

IOL, OUTPUT CURRENT (mA)

Figure 9. Single–Ended Output V oltage

versus Output Source Current

5.0

4.0

3.0

VCC = 5.25 V

VCC = 5.00 V

VCC = 4.75 V

5.25 V

2.0

1.75

1.5

, OUTPUT VOL TAGE (V)

OL

1.25

V

1.0
–40 0–20

4.0

3.75

Figure 8. Single–Ended Output V oltage

versus T emperature

IOL = 27.8 mA

IOL = 20.0 mA

4.75 V p VCC p 5.25 V

TA, AMBIENT TEMPERATURE (

°

C)

Figure 10. Single–Ended Output

V oltage versus Temperature

IOH = –20.0 mA

IOH = –27.8 mA

85604020

, OUTPUT VOL TAGE (V)

2.0

OH

V

1.0

4.0

3.0

2.0

1.0

, DIFFERENTIAL OUTPUT VOLTAGE (V)

OD

V

0

–100–30–20 –40 –5060–60

IOH, OUTPUT CURRENT (mA)

Figure 11. Output Differential Voltage

versus Load Current

VCC = 5.25 V

VCC = 5.0 V

VCC = 4.75 V

0.8 or

2.0 V

10

I

V

O

OD

5030 40020

IO, OUTPUT CURRENT (mA)

TA = 25°C

TA = 25°C

–70

70

3.5

, OUTPUT VOL TAGE (V)

OH

V

3.25

–40 0–20 6040

TA, AMBIENT TEMPERATURE (

20

Figure 12. Output Differential Voltage

versus T emperature

4.0

3.0

IO = 20.0 mA

2.0

1.0

, DIFFERENTIAL OUTPUT VOLTAGE (V)

OD

V

0
–40

0.8 or

2.0 V

I

V

O

OD

0

TA, AMBIENT TEMPERATURE (

VCC = 4.75 V

85

°

C)

IO = 27.8 mA

VCC = 4.75 V

20 40 60–20

°

C)

85

6

MOTOROLA ANALOG IC DEVICE DATA

MC75172B MC75174B

A)

µ

, LEAKAGE CURRENT (
I

2.0

1.0

–1.0

OZ

–2.0

5.0

0

–7.0

Figure 13. Output Leakage Current

versus Output Voltage

TA = 25°C
En = Low, En

1.0–3.0 5.0 9.0 12 –40

Vz, APPLIED OUTPUT VOLTAGE (V)

= High

Figure 15. Input Current

versus Input V oltage

A)I ,

µ

–5.0

, LEAKAGE CURRENT (

–10

OZ

I

OX

–15
–20

150

20
15
10

5.0

Figure 14. Output Leakage Current

versus T emperature

V

= +12 V

0

out

V

= 7.0 V

out

En = Low, En = High
or VCC = 0 V

0–20

TA, AMBIENT TEMPERATURE (

20

40

60

°

C)

85

Figure 16. Short Circuit Current

versus Common Mode V oltage

0

A)

µ

–5.0

–10

–15

, INPUT CURRENT (

in

I

–20

–25

–0.5 3.52.51.5

Enable
Pins

Driver
Inputs

4.75 p VCC p 5.25 V
TA = 25

Vin, INPUT VOLTAGE (V)

90

30

0

–30

°

C

4.5

, SHORT CIRCUIT CURRENT (mA)

–90

OS

I

–150

–7.0 –3.05.5 5.0 121.0

Normally Low Output

Vz, APPLIED OUTPUT VOLTAGE (V)

Normally High Output

TA = 25°C

p

VCC p 5.25 V

4.75

9.00.5

MOTOROLA ANALOG IC DEVICE DATA

7

MC75172B MC75174B

HLHHXXHLL

LHHXXLLHH

HLXXLLHLL

LXXLLHLZH

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.

Outputs

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.

T able 1. MC75172B Truth Table

Enables Outputs

Data Input

H H X H L

T able 2. MC75174B Truth Table

Data Input Enable

H H H L

L

X L Z Z

H = Logic high, L = Logic low, X = Irrelevant, Z = High impedance

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).

The outputs will be in the high impedance mode when:

the Enable inputs are set according to Table 1 or 2; a)

b)

VCC is less than 1.5 V;

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.

EN EN Y Z

Outputs

Y Z

H

L

H

L
H
Z

H

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 (see Figure 16). The short circuit current will flow
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.

b)

A thermal shutdown circuit disables the outputs when
the junction temperature reaches 150°C, ±ā20°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.

Driver Inputs

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 VCC for 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 characteristics of the driver inputs are shown in Figure

15. This graph is not affected by the state of the Enable pins.

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
their voltage must be kept within the range of 0 V to VCC for
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.

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 VOD required by
EIA–422–A is the reason for the narrower temperature range.

8

MOTOROLA ANALOG IC DEVICE DATA

MC75172B MC75174B

The maximum ambient operating temperature (applicable
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:

T

Jmax–TA

+

R

q

JA

= package thermal resistance (typical

θJA

where:

PD

max

R
70°C/W for the DIP package, 85°C/W for SOIC
package);
T

= max. operating junction

Jmax

temperature, and
TA = ambient temperature.

Since the thermal shutdown feature has a trip point of
150°C, ± 20°C, T

is selected to be 130°C. The power

Jmax

dissipated within the package is calculated from:
PD

= {[(VCC – VOH) • IOH] + VOL • IOL)} each driver

= + (VCC • ICC)

where:

VCC = the supply voltage;
VOH, VOL are measured or estimated from
Figures 7 to 10;
ICC = the quiescent power supply current
(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:

TA = 25°C, IOL = IOH = 55 mA for each driver,
VCC = 5.0 V, DIP package. How many drivers per package
can be used?

Maximum allowable power dissipation is:

PD

max

130°C*25°C

+

70°CńW

+

1.5 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, VOL [1.75 V , and VOH [3.85 V . The
power dissipated in each driver is:

{(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

Example 2:

TA = 85°C, IOL = 27.8 mA, IOH = 20 mA for each
driver, VCC = 5.0 V, SOIC package. How many drivers per
package can be used?

Maximum allowable power dissipation is:

130

°C

*

PD

max

+

85

°C

85°C

ń

W

+

0.53 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 VCC = 5.0 V),
VOL [1.38 V, and VOH [4.27 V. The power dissipated in
each driver is:

{(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

reducing the load current, reducing the ambient temperature,
and/or providing a heat sink.

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.

Figure 17. Unit Load Definition

I

1.0 mA

–7.0 V

Reprinted from EIA–485, Electronic Industries Association,
Washington,DC.

–3.0 V

–0.8 mA

5.0 V

V

12 V

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.

System Example

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.

T ermination 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.

MOTOROLA ANALOG IC DEVICE DATA

9

MC75172B MC75174B

Figure 18. T ypical EIA–485 System

TTL

En

TTL

D

#1

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.

En

D

#6

R

T

R

T

TTL

R

TTL

#2

En

D

#2

TTLEnTTL

TTL

TTL

TTL

#3

#4

D

#3

120

Ω

Twisted

Pair

R

En

D

#4

R

R

TTL

#1

R

#6

TTL

#8

R

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.

R

#7

TTL TTL

R

#5

TTL

En

D

#5

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
Open Circuit Voltage

Differential
Single–Ended

Loaded Differential Voltage V

Differential Voltage Balance ∆V
Output Common Mode Range V
Offset Voltage V
Offset Voltage Balance ∆V
Short Circuit Current I

Leakage Current (VCC = 0) I

Output Rise/Fall Time (Note 2) tr, t

RECEIVER

Input Sensitivity V
Input Bias Voltage V
Input Common Mode Range V
Dynamic Input Impedance R

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.TB = Bit time.

V
V

out

OCD
OCS

OD

OD

CM

OS

OS

OS

OLK

th

bias

cm

in

Not Specified

1.5 to 6.0 V

t

6.0 V

1.5 to 5.0 V, w/54 Ω load

t

200 mV
–7.0 to +12 V Not Specified Not Specified
–1.0 t VOS t 3.0 V

t

200 mV

p

250 mA for –7.0 to
12 V

Not Specified

p

f

0.3 TB, w/54 Ω/1150 pF

load

± 200 mV ± 200 mV ± 300 mV

p

3.0 V
–7.0 to 12 V –7.0 to 7.0 V –7.0 to 7.0 V
Spec number of U.L.

t

100 Ω 50 10 100 Ω

p

6.0 V

p

6.0 V

q

2.0 V or q 0.5

V

, w/100 Ω load

OCD

p

400 mV

p

3.0 V

p

400 mV

p

150 mA to ground

p

100 µA to –0.25 V

thru 6.0 V

p

0.1 TB or p 20 ns,

w/100 Ω load

p

3.0 V

q

4 kΩ

p

6.0 V, w/3.9 kΩ, Load

p

6.0 V, w/3.9 kΩ, Load

q

2.0 V orq0.5 V

w/100 Ω load

t

400 mV

p

3.0 V

t

400 mV

p

150 mA to ground

p

100 µA to ± 0.25 V

p

0.1 TB or p 20

w/100 Ω load

p

3.0 V

q

4 kΩ

OCD

ns,

,

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, V A (703–487–4600).

MOTOROLA ANALOG IC DEVICE DATA

11

MC75172B MC75174B

–A–

916

B

18

F

H

G

D

16 PL

0.25 (0.010) T

–A–

20

1

11

10

D20X

M

0.010 (0.25) B

18X

G

A

T

S

–B–

S

K

C

SEATING

–T–

PLANE

K

M

M

A

P10X

0.010 (0.25)

S

C

SEATING

–T–

PLANE

OUTLINE DIMENSIONS

P SUFFIX

PLASTIC PACKAGE

CASE 648–08

ISSUE R

L

J

DW SUFFIX

PLASTIC PACKAGE

CASE 751D–04

(SO–20L)

ISSUE E

M

M

B

J

F

M

M

R

X 45

NOTES:

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.

DIM MIN MAX MIN MAX

A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01

NOTES:

1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.

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.

DIM MIN MAX MIN MAX

A 12.65 12.95 0.499 0.510
B 7.40 7.60 0.292 0.299
C 2.35 2.65 0.093 0.104
D 0.35 0.49 0.014 0.019

_

F 0.50 0.90 0.020 0.035
G 1.27 BSC 0.050 BSC
J 0.25 0.32 0.010 0.012
K 0.10 0.25 0.004 0.009
M 0 7 0 7

__

P 10.05 10.55 0.395 0.415
R 0.25 0.75 0.010 0.029

MILLIMETERSINCHES

____

INCHESMILLIMETERS

__

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola
was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.

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12

◊

MOTOROLA ANALOG IC DEVICE DATA

MC75172B/D

*MC75172B/D*