STR485E compatible Datasheet

STR485E Datasheet, PDF, Equivalent


Part Number

STR485E

Description

3.3V RS485 compatible

Manufacture

STMicroelectronics

Total Page 25 Pages
Datasheet
Download STR485E Datasheet


STR485E
STR485E
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
STR485E
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 128 transceivers on the bus @ 125 °C
• Fail safe receiver (bus open, idle and shorted)
• Thermal shutdown protection
• Low quiescent current in shutdown mode
• Extended temperature range : -40 °C to +125 °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 STR485E 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.
DS13051 - Rev 2 - October 2019
For further information contact your local STMicroelectronics sales office.
www.st.com

STR485E
1 Pin connections
Figure 1. Pin connections
VL VCC
RB
DE A
RE SLR
D GND
STR485E
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:
serial resistors of 150 ohms followed by 2.5 Mohms/ GND
Receiver enable input:
serial resistors of 150 ohms followed by 2.5 Mohms / VCC
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
DS13051 - Rev 2
page 2/25


Features STR485E Datasheet 3.3 V RS485 compatible with 1.8 V I/Os and selectable speed 2 0 Mbps or 250 kbps DFN10 3 x 3 Product status link STR485E Features • Half -duplex RS485 transceiver • 1.65 V to 3.6 V supply for data and enable signa ls • 3 V to 3.6 V supply for bus supp ly • High speed: up to 20 Mbps data r ate • Low speed selected by SLR pin : 250 kbps • Up to 128 transceivers on the bus @ 125 °C • Fail safe receiv er (bus open, idle and shorted) • The rmal shutdown protection • Low quiesc ent current in shutdown mode • Extend ed temperature range : -40 °C to +125 °C • Available in industry standard DFN10 • Bus-pin protection more than: – ±4 kV HBM protection – ±8 kV I EC61000-4-2 contact discharge – ±16 kV IEC61000-4-2 air discharge – Compl iant IEC61000-4-4 fast transient burst Class B Description The STR485E is a lo w power differential line transceiver f or data transmission standard RS485 app lications in half-duplex mode. Data and enable signals are compatible with 1.8 V or 3.3 V supplies. T.
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