Datasheet SN75140D, SN75140JG, SN75140P Datasheet (Texas Instruments)

SN75140

DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Single 5-V Supply

D

±100-mV Sensitivity

D

For Application as:
– Single-Ended Line Receiver
– Gated Oscillator
– Level Comparator

D

Adjustable Reference Voltage

D

TTL Outputs

D

TTL-Compatible Strobe

D

Designed for Party-Line (Data-Bus)
Applications

D

Common Reference-V oltage Pin

D

Common Strobe

description

This device consists of a dual single-ended line receiver with TTL-compatible strobes and outputs. The
reference voltage (switching threshold) is applied externally and can be adjusted from 1.5 V to 3.5 V, making
it possible to optimize noise immunity for a given system design. Due to the low input current (less than 100 µA),
the device is suited ideally for party-line (data-bus) systems.

The SN75140 has a common reference-voltage pin and a common strobe.
The SN75140 is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

(each receiver)

LINE INPUT

STROBE OUTPUT

≤ V

ref

– 100 mV L H

≥ V

ref

+ 100 mV X L

X H L

H = high level, L = low level, X = irrelevant

logic symbol

‡

2

COMSTRB

‡

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

3

1LINE

1OUT

1

≥1

5

2LINE

2OUT

7

≥1

6

COMREF

Copyright  1998, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1
2
3
4

8
7
6
5

1OUT

COMSTRB

1LINE

GND

V

CC

2OUT
COMREF
2LINE

P OR PS† PACKAGE

(TOP VIEW)

†

The PS package is only available
left-ended taped and reeled (order
SN75140 PSR).

SN75140
DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic diagram (positive logic)

2
3

6

5

1

7

1OUT

2OUT

COMSTRB

1LINE

COMREF

2LINE

schematic (each receiver)

To Other
Line Receiver

V

CC

OUT

COMSTRB

To Other Line Receiver

To Other

Line Receiver

GND

COMREF

LINE

NOTE: Resistor values shown are nominal and in ohms.

1500 750 40001500 4000 130

1500

750

850

470

470

2900

500 1000

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage, V

CC

(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reference input voltage, V

ref

5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line input voltage range with respect to GND –2 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line input voltage with respect to V

ref

±5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Strobe input voltage 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Unless otherwise specified, voltage values are with respect to network ground terminal.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

P 1000 mW 8.0 mW/°C 640 mW

PS 450 mW 3.6 mW/°C 288 mW

SN75140

DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V

CC

4.5 5 5.5 V

Reference input voltage, V

ref

1.5 3.5 V

High-level line input voltage, V

IH(L)

V

ref

+0.1 VCC–1 V

Low-level line input voltage, V

IL(L)

0 V

ref

–0.1

V

High-level strobe input voltage, V

IH(S)

2 5.5 V

Low-level strobe input voltage, V

IL(S)

0 0.8 V

Operating free-air temperature range, T

A

0 70 °C

electrical characteristics over recommended operating free-air temperature range,
V

CC

= 5 V ±10%, V

ref

= 1.5 V to 3.5 V (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

V

IK

Strobe input clamp voltage I

I(S)

= –12 mA –1.5 V

p

VOHHigh-level output voltage

V

IL(L)

=

V

ref

–

100 mV

,

V

IL(S)

= 0.8 V,

I

OH

= –

400 µA

2.4

V

p

V

IH(L)

=

V

ref

+

100 mV

,

V

IL(S)

=

0.8 V

,

I

OL

=

16 mA

0.4

VOLLow-level output voltage

V

V

IL(L)

=

V

ref

–

100 mV

,

V

IH(S)

= 2 V,

I

OL

= 16

mA

0.4

Strobe input
current at

Strobe

1

I

I(S)

maximum input
voltage

COMSTRB

V

I(S)

= 5.5

V

2

mA

Strobe

40

COMSTRB

V

I(S)

=

2.4 V

80

I

IH

High-level

p

LINE V

I(L)

= 3.5 V, V

ref

= 1.5 V 35 100

µA

in ut current

Reference

35 100

COMREF

V

I(L)

= 0,

V

ref

= 3.5

V

70 200

Strobe

–1.6

COMSTRB

V

I(S)

= 0.4

V

–3.2

mA

I

IL

Low-level

p

LINE V

I(L)

= 0, V

ref

= 1.5 V –10

in ut current

Reference

–10

µA

COMREF

V

I(L)

= 1.5 V,

V

ref

=

0

–20

I

OS

Short-circuit output current

‡

VCC = 5.5 V –18 –55 mA

I

CCH

Supply current, output high V

I(S)

= 0, V

I(L)

= V

ref

– 100 mV 18 30 mA

I

CCL

Supply current, output low V

I(S)

= 0, V

I(L)

= V

ref

+ 100 mV 20 35 mA

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

Only one output should be shorted at a time.

switching characteristics, VCC = 5 V, V

ref

= 2.5 V, TA = 25°C

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

t

PLH(L)

Propagation delay time, low- to high-level output from LINE

CL = 15 pF, RL = 400 kΩ,
See Figure 1

22 35 ns

t

PHL(L)

Propagation delay time, high- to low-level output from LINE

CL = 15 pF, RL = 400 kΩ,
See Figure 1

22 30 ns

t

PLH(S)

Propagation delay time,
low- to high-level output from COMSTRB

CL = 15 pF, RL = 400 kΩ,
See Figure 1

12 22 ns

t

PHL(S)

Propagation delay time,
high- to low-level output from COMSTRB

CL = 15 pF, RL = 400 kΩ,
See Figure 1

8 15 ns

SN75140
DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

VOLTAGE WA VEFORMS

t

PLH(S)

t

PLH(L)

2.7 V

2.3 V

3.5 V

0 V

V

OH

V

OL

t

PHL(L)

Output

≤ 10 ns≤ 10 ns

LINE

RL = 400 Ω

(see Note D)

TEST CIRCUIT

(see Note A)

OutputV

CC

2.5 V

t

PHL(S)

COMSTRB

LINE

COMSTRB

(see Note B)

CL = 15 pF

(see Note B)

≤ 10 ns ≤10 ns

2.5 V 2.5 V

1.5 V 1.5 V 1.5 V 1.5 V

1.5 V

1.5 V

NOTES: A. Input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, duty cycle ≤50%, ZO = 50 Ω.

B. Unused strobes are to be grounded.
C. CL includes probe and jig capacitance.
D. All diodes are 1N3064.

90%

10% 10%

90%

10% 10%

Figure 1. Test Circuit and Voltage Waveforms

TYPICAL CHARACTERISTICS

OUTPUT VOLTAGE

vs

LINE INPUT VOLTAGE

V

I(L)

– Line Input Voltage – V

VO – Output Voltage – V

V

O

VCC = 5 V
V

ref

= 2.5 V

V

I(S)

= 0

TA = 25°C

4

3

1

2

0

012345

Figure 2

SN75140

DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

Twisted-Pair Line

Strobe

Data Input

R

T

1/2 SN75372 1/2 SN75140

V

ref

5 V

OUT

Strobe

Figure 3. Line Receiver

N = 75

†

N = 74

N = 2

N = 1

COMSTRB

SN75140

SN75140

†

Although most series SN54/SN74 circuits have a >2.4-V output at 400 µA, they typically are capable of maintaining a >2.4-V output level under
a load of 7.5 mA.

Any Series
SN54/SN74

Logic

COMSTRB

1.5 V

1.5 V

Figure 4. High Fanout From Standard TTL Gate

SN75140
DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

RT (50 Ω to 100 Ω
depending on line impedance)

1/2 SN75453B

1/2 SN75140

VCC = 5 V

V

ref

= 1.5 V to 3.5 V

Data Out Strobe

Data Out

Data In Strobe

Data In

Data Bus

5 V

VCC = 5 V

NOTE A: Using this arrangement, as many as 100 transceivers can be connected to a single data bus. The adjustable reference-voltage feature

allows the noise margin to be optimized for a given system. The complete dual bus transceiver (SN75453B driver and SN75140
receiver) can be assembled in approximately the same space required by a single 16-pin package and only one power supply is
required (5 V). Data in and data out are TTL compatible.

5 V

Figure 5. Dual Bus Transceiver

Signal Input

TTL Output

Strobe

VCC = 5 V

R1

R

F

R

T

1/2 SN75140

Figure 6. Schmitt Trigger

SN75140

DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

VO – Output Voltage – V

VI – Input Voltage – VVI – Input Voltage – V

VO – Output Voltage – VV

O

V

O

R1 = 5.9 kΩ
RT = 3.9 kΩ
RF = 5 kΩ
TA = 25°C

OUTPUT VOLTAGE

vs

INPUT VOLTAGE

OUTPUT VOLTAGE

vs

INPUT VOLTAGE

R1 = 6.2 kΩ
RT = 3.9 kΩ
RF = 16 kΩ
TA = 25°C

4

3

1

2

0

0 0.5 1 1.5 2 32.5

0.5

1.5

2.5

3.5

4

3

1

2

0

0 0.5 1 1.5 2 32.5

0.5

1.5

2.5

3.5

NOTE A: Slowly changing input levels from data lines, optical detectors, and other types of transducers can be converted to standard TTL

signals with this Schmitt-trigger circuit. R1, RF, and RT can be adjusted for the desired hysteresis and trigger levels.

Figure 7. Examples of Transfer Characteristics

COMSTRB

OUT

t

w

COMSTRB

V

CC

V

ref

C

OUT

R

F

R

SN75140

Figure 8. Gated Oscillator

SN75140
DUAL LINE RECEIVER

SLLS080C – JANUARY 1977 – REVISED APRIL 1998

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

V

ref

= 1.5 V

V

ref

= 2.5 V

TA = 25°C

VCC = 5 V

tw = 0.6

RF = 15 kΩ

RC Time Constant – µs

– Oscillator Frequency – MHz

OSCILLATOR FREQUENCY

vs

RC TIME CONSTANT

f

f

osc

40

20

2

7

0

0.1 0.2 0.4 0.7 2 107

4

10

14

Figure 9

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Copyright  1998, Texas Instruments Incorporated