STR485LV datasheet(5/24 Pages) STMICROELECTRONICS

No de pièce	STR485LV

Description	3.3 V RS485 compatible with 1.8 V I/Os and selectable speed 20 Mbps or 250 kbps

PDF	24 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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5 / 24 page

Figure 5. Example of typical application

GND

VCC

SLR

120Ω

Table 2. Driver truth table

INPUT D

ENABLE DE

OUTPUT A

OUTPUT B

Function

Actively drive bus high

Actively drive bus low

Driver disabled

Open

Driver disabled by default

Open

Actively drive bus high by default

Table 3. Receiver truth table

Differential input VID = VA -VB

ENABLE RE

OUTPUT R

Function

VID > VIT+

Receive valid bus high

VIT- < VID < VIT+

Indeterminate bus state

VID < VIT-

Receive valid bus low

Receiver disabled

OPEN

Receiver disabled by default

Open-circuit bus

Fail safe high output

Short-circuit bus

Fail safe high output

Idle (terminated) bus

Fail safe high output

Table 4. Speed selection, SLR pin configuration

SLR

Data rate

Typical tr / tf

250 kbps

200 ns

GND or OPEN

20 Mbps

7 ns

STR485

Truth tables

DS12713 - Rev 1

page 5/24

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