SN65ALS1176

DIFFERENTIAL BUS TRANSCEIVER

SLLS295A – APRIL 1998 – REVISED DECEMBER 1999

6

POST OFFICE BOX 655303

RECEIVER SECTION

electrical characteristics over recommended ranges of common-mode input voltage, supply

voltage, and operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIT+

Positive-going input threshold voltage

VO = 2.7 V,

IO = – 0.4 mA

0.2

V

VIT –

Negative-going input threshold voltage

VO = 0.5 V,

IO = 8 mA

– 0.2‡

V

Vhys

Hysteresis voltage (VIT + – VIT –)

60

mV

VIK

Enable-input clamp voltage

II = – 18 mA

– 1.5

V

VOH

High level output voltage

VID = 200 mV,

IOH = – 400 µA,

27

V

VOH

High-level output voltage

ID

,

See Figure 6

OH

µ ,

2.7

V

VOL

Low level output voltage

VID = – 200 mV,

IOL = 8 mA,

045

V

VOL

Low-level output voltage

ID

,

See Figure 6

OL

,

0.45

V

IOZ

High-impedance-state output current

VO = 0.4 V to 2.4 V

±20

µA

VI

Line input current

Other input = 0 V,

VI = 12 V

1

mA

VI

Line input current

,

See Note 5

VI = – 7 V

– 0.8

mA

IIH

High-level-enable input current

VIH = 2.7 V

20

µA

IIL

Low-level-enable input current

VIL = 0.4 V

– 100

µA

rI

Input resistance

12

20

k

Ω

IOS

Short-circuit output current

VID = 200 mV,

VO = 0

–15

–85

mA

ICC

Supply current

No load

Outputs enabled

23

30

mA

ICC

Supply current

No load

Outputs disabled

19

26

mA

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

‡ The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet for common-mode

input voltage and threshold voltage levels only.

NOTE 5: This applies for both power on and power off. Refer to TIA/EIA-485-A for exact conditions.

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

temperature range

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

tpd

Propagation time

VID = – 1.5 V to 1.5 V,

CL = 15 pF,

25

ns

tsk(p)

Pulse skew§

ID

,

See Figure 7

L

,

0

2

ns

tPZH

Output enable time to high level

11

18

ns

tPZL

Output enable time to low level

CL =15 pF

See Figure 8

11

18

ns

tPHZ

Output disable time from high level

CL = 15 pF,

See Figure 8

50

ns

tPLZ

Output disable time from low level

30

ns

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

§ Pulse skew is defined as the |tPLH – tPHL| of each channel of the same device.