RS485 compatible. STR485 Datasheet

STR485 compatible. Datasheet pdf. Equivalent


Part STR485
Description 3.3V RS485 compatible
Feature STR485 Datasheet 3.3 V RS485 compatible with 1.8 V I/Os and selectable speed 20 Mbps or 250 kbps DF.
Manufacture STMicroelectronics
Datasheet
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STR485
STR485
Datasheet
3.3 V RS485 compatible with 1.8 V I/Os and selectable speed 20 Mbps or
250 kbps
DFN10 3 x 3
Product status link
STR485
Features
• Half-duplex RS485 transceiver
• 1.65 V to 3.6 V supply for data and enable signals
• 3 V to 3.6 V supply for bus supply
• High speed: up to 20 Mbps data rate
• Low speed selected by SLR pin : 250 kbps
• Up to 256 transceivers on the bus
• Fail safe receiver (bus open, idle and shorted)
• Thermal shutdown protection
• Low quiescent current in shutdown mode
• Extended temperature range : -40 °C to +105 °C
• Available in industry standard DFN10
• Bus-pin protection more than:
– ±4 kV HBM protection
– ±8 kV IEC61000-4-2 contact discharge
– ±16 kV IEC61000-4-2 air discharge
– Compliant IEC61000-4-4 fast transient burst Class B
Description
The STR485 is a low power differential line transceiver for data transmission
standard RS485 applications in half-duplex mode. Data and enable signals are
compatible with 1.8 V or 3.3 V supplies.
Two speeds are selectable through SLR pin: fast data rate up to 20 Mbps or slow
data rate for extended cable running to 250 kbps.
Excessive power dissipation caused by bus contention or faults is prevented by
thermal shutdown circuit that forces the driver outputs into a high impedance state.
The receiver has a fail-safe feature, which guarantees a high output state when the
inputs are left open, shorted or idle.
DS12713 - Rev 3 - April 2019
For further information contact your local STMicroelectronics sales office.
www.st.com



STR485
1 Pin connections
Figure 1. Pin connections
VL VCC
RB
DE A
RE SLR
D GND
STR485
Pin connections
Name
VL
R
DE
nRE
D
GND
SLR
A
B
VCC
Table 1. Pin description
Pin I/O
1 Logic supply
2 Digital output
3 Digital input
4 Digital input
5 Digital input
6 Ground
7 Digital input
8 Bus I/O
9 Bus I/O
10 Bus supply
Description
1.65 V to 3.6 V supply for logic I/O signals
Receiver data output
Driver enable input
Receiver enable input
Transmission data input
Slew rate select: low = 20 Mbps, high = 250 kbps.
Default to 20 Mbps if SLR is left floating
Digital bus I/O, A
Digital bus I/O, B
3 V to 3.6 V supply for A and B bus lines
Figure 2. Typical application schematic
1.8 V
3.3 V
VL SLR
VCC
A
D
DE
R
RE
GND
B
RT
120 Ω
RT
120 Ω
3.3 V
1.8 V
VCC
A
B
SLR VL
GND
D
DE
R
RE
DS12713 - Rev 3
page 2/24







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