SN75179B

DIFFERENTIAL DRIVER AND RECEIVER PAIR

SLLS003E – OCTOBER 1985 – REVISED JUNE 1998

4

POST OFFICE BOX 655303

DRIVER SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

Input clamp voltage

II = - 18 mA

– 1.5

V

VO

Output voltage

IO = 0

0

6

V

VOD1 Differential output voltage

IO = 0

1.5

6

V

VOD2 Differential output voltage

RL = 100 Ω,

See Figure 1

1/2VOD1

or 2‡

V

OD2

g

RL = 54 Ω,

See Figure 1

1.5

2.5

5

V

VOD3 Differential output voltage

See Note 4

1.5

5

V

∆VOD

Change in magnitude of common-mode

output voltage§

±0.2

V

VOC

Common-mode output voltage

RL = 54 Ω or 100 Ω,

See Figure 1

3

–1

V

∆VOC

Change in magnitude of common-mode

output voltage§

±0.2

V

IO

Output current

VCC = 0,

VO = – 7 V to 12 V

±100

µA

IIH

High-level input current

VI = 2.4 V

20

µA

IIL

Low-level input current

VI = 0.4 V

– 200

µA

IOS

Short circuit output current

VO = – 7 V

– 250

mA

IOS

Short-circuit output current

VO = VCC or 12 V

250

mA

ICC

Supply current (total package)

No load

57

70

mA

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

‡ The minimum VOD2 with 100-Ω load is either 1/2 VOD2 or 2 V, whichever is greater.

§

∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input changes from a high level to a low

level.

NOTE 4: See TIA/EIA-485-A, Figure 3.5, Test Termination Measurement 2.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

td(OD)

Differential output delay time

RL =54 Ω

See Figure 3

15

22

ns

tt(OD)

Differential output transition time

RL = 54 Ω,

See Figure 3

20

30

ns

Symbol Equivalents

DATA-SHEET PARAMETER

TIA/EIA-422-B

TIA/EIA-485-A

VO

Voa, Vob

Voa, Vob

|VOD1 |

Vo

Vo

|VOD2 |

Vt (RL = 100 Ω)

Vt (RL = 54 Ω)

|VOD3 |

Vt (Test Termination Measurement 2)

∆|VOD|

||Vt |– |Vt ||

||Vt |– |Vt ||

VOC

|Vos |

|Vos |

∆|VOC|

|Vos –Vos |

|Vos –Vos |

IOS

|Isa |, | Isb |

IO

|Ixa |, | Ixb |

Iia , Iib