DS481 datasheet(2/17 Pages) TI1

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DS481

SNLS131B – JULY 2000 – REVISED MARCH 2013

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Table 1. Pin Descriptions

Pin Name

Number

DESCRIPTION

Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI

≥ DO (1)/RI (1) by 200 mV, RO will be HIGH. If DO/RI ≤ DO (1)/RI (1) by 200 mV, RO will be

LOW. Additionally RO will be HIGH for OPEN (Non-terminated) Inputs.

Receiver Output Enable: When RE (1) is LOW the receiver output is enabled. When RE (1) is

RE (1)

HIGH, the receiver output is in TRI-STATE (OFF). When RE (1) is HIGH and DE is LOW, the

device will enter a low-current sleep mode after 600 ns.

Driver Output Enable: When DE is HIGH, the driver outputs are enabled. When DE is LOW,

the driver outputs are in TRI-STATE (OFF). When RE (1) is HIGH and DE is LOW, the device

will enter a low-current sleep mode after 600 ns.

Driver Input: When DE (Driver Enable) is HIGH, the driver is enabled, if DI is LOW, then

DO/RI will be LOW and DO (1)/RI (1) will be HIGH. If DI is HIGH, then DO/RI is HIGH and

DO (1)/RI (1) is LOW.

GND

Ground Connection.

DO/RI

Driver Output/Receiver Input, 485 Bus Pin.

DO (1)

Driver Output/Receiver Input, 485 Bus Pin.

/RI (1)

Positive Power Supply Connection: Recommended operating range for VCC is +4.75V to

VCC

+5.25V.

(1)

Non Terminated, Open Input only

Truth Table

DRIVER SECTION

RE (1)

X(2)

Z(2)

Z(2) (3)

RECEIVER SECTION

RE (1)

A-B

≥+0.2V

≤−0.2V

X(2)

Z (2)(3)

OPEN (1)

(1)

Non Terminated, Open Input only

(2)

X = indeterminate

Z = TRI-STATE

(3)

Device enters sleep mode if enable conditions are held > 600 ns, DE = L and RE = H. RE is Non Terminated and Open Input only.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

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