SN65LBC170, SN75LBC170

TRIPLE DIFFERENTIAL TRANSCEIVERS

SLLS459C − NOVEMBER 2000 − REVISED MARCH 2005

4

POST OFFICE BOX 655303

DRIVER SECTION

electrical characteristics over recommended operating conditions

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

Input clamp voltage

D and DIR

II = 18 mA

−1.5

−0.7

V

VO

Open-circuit output voltage (single-ended)

A or B,

No load

0

VCC

V

Steady-state differential output voltage

No load

3.8

4.3

VCC

|VOD(SS)|

Steady-state differential output voltage

magnitude‡

RL = 54 Ω,

See Figure 1

1

1.6

2.4

V

|VOD(SS)|

magnitude‡

With common-mode loading, See Figure 2

1

1.6

2.4

V

∆VOD

Change in differential output voltage

magnitude, | VOD(H) | – |VOD(L) |

RL = 54 Ω,

−0.2

0.2

V

VOC(SS)

Steady-state common-mode output voltage

RL = 54 Ω,

CL = 50 pF

See Figure 1

2

2.4

2.8

V

∆VOC(SS)

Change in steady-state common-mode output

voltage (VOC(H) – VOC(L))

CL = 50 pF

See Figure 1

−0.2

0.2

V

II

Input current

D, DIR

−100

100

µA

IO

Output current with power off

VCC = 0 V,

VO = −7 V to 12 V

−700

900

µA

IOS

Short-circuit output current

VO = −7 V to 12 V,

See Figure 7

−250

250

mA

ICC

Supply current (driver enabled)

D at 0 V or VCC,

DIR at VCC, No load

14

20

mA

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

‡ The minimum VOD may not fully comply with TIA/EIA-485-A at operating temperatures below 0°C. System designers should take the possibly

lower output signal into account in determining the maximum signal-transmission distance.

switching characteristics over recommended operating conditions

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH

Differential output propagation delay, low-to high

4

8.5

12

tPHL

Differential output propagation delay, high-to-low

4

8.5

11

tr

Differential output rise time

3

7.5

11

tf

Differential output fall time

RL = 54 Ω, CL = 50 pF, See Figure 3

3

7.5

11

ns

tsk(p)

Pulse skew | (tPLH – tPHL) |

RL = 54 Ω, CL = 50 pF, See Figure 3

2

ns

tsk(o)

Output skew§

1.5

tsk(pp)

Part-to-part skew¶

2

tPLH

Differential output propagation delay, low-to high

3

7

10

tPHL

Differential output propagation delay, high-to-low

3

7.5

10

tr

Differential output rise time

See Figure 4,

3

7.5

12

tf

Differential output fall time

See Figure 4,

(HVD SCSI double-terminated load)

3

7.5

12

ns

tsk(p)

Pulse skew | (tPLH – tPHL) |

(HVD SCSI double-terminated load)

3

ns

tsk(o)

Output skew§

1.5

tsk(pp)

Part-to-part skew¶

2.5

tPZH

Output enable time to high level

See Figure 5

15

25

ns

tPHZ

Output disable time from high level

See Figure 5

18

25

ns

tPZL

Output enable time to low level

See Figure 6

10

25

ns

tPLZ

Output disable time from low level

See Figure 6

17

25

ns

§ Output skew (tsk(o)) is the magnitude of the time delay difference between the outputs of a single device with all of the inputs connected together.

¶ Part-to-part skew (tsk(pp)) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when

both devices operate with the same input signals, the same supply voltages, at the same temperature, and have identical packages and test

circuits.