SN75ALS170, SN75ALS170A

TRIPLE DIFFERENTIAL BUS TRANSCEIVER

SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995

5

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 = – 19 mA

– 1.5

V

VO

Output voltage

IO = 0

0

6

V

VCC = 4 75 V

VIH =2V

VOH

High-level output voltage

VCC = 4.75 V,

VIL 08 V

VIH = 2 V,

IOH

55 mA

2.7

V

VOH

High level out ut voltage

VIL = 0.8 V,

IOH = – 55 mA

2.7

V

VOL

Low-level output voltage

VCC = 4.75 V,

VIL = 0.8 V,

VIH = 2 V,

IOL = 55 mA

1.7

V

| VOD1 |

Differential output voltage

IO = 0

1.5

6

V

| VOD2 |

Differential output voltage

RL = 100 Ω,

See Figure 1

1/2 VOD1

or 2§

V

OD2

g

RL = 54 Ω,

See Figure 1

1.5

2.5

5

V

VOD3

Differential output voltage

Vtest = – 7 V to 12 V,

See Figure 2

1.5

5

V

∆ | VOD |

Change in magnitude of differential output

voltage¶

±0.2

V

VOC

Common mode output voltage

R

540

Ω or 100 Ω See Figure 1

3

V

VOC

Common-mode output voltage

RL = 540 Ω or 100 Ω, See Figure 1

–1

V

∆ | VOC |

Change in magnitude of common-mode

output voltage¶

±0.2

V

IO

Output current

Output disabled,

VO = 12 V

1

mA

IO

Output current

,

See Note 3

VO = –7 V

– 0.8

mA

IIH

High-level input current

VI = 2.4 V

20

µA

IIL

Low-level input current

VI = 0.4 V

– 400

µA

VO = – 6 V

– 250

IOS

Short circuit output current

VO = 0

– 150

mA

IOS

Short-circuit output current

VO = VCC

250

mA

VO = 8 V

250

ICC

Supply current

No load

Outputs enabled

69

90

mA

ICC

Supply current

No load

Outputs disabled

57

78

mA

† The power-off measurement in ANSI Standard EIA/TIA-422-B applies to disabled outputs only and is not applied to combined inputs and outputs.

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

§ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2 V, whichever is greater.

¶

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

low level.

NOTE 3: This applies for both power on and off; refer to EIA Standard RS-485 for exact conditions. The EIA/TIA-422-B limit does not apply for

a combined driver and receiver terminal.