TPT481
3.0V to 5.5V RS-485 Transceivers
Features
⚫
⚫
Exceeds Requirements of EIA-485 Standard
Hot Plug Circuitry - Tx and Rx Outputs Remain Three-
State During Power-up/Power-down
⚫
⚫
⚫
⚫
⚫
Data Rate: 20 Mbps
Up to 256 Nodes on a Bus (1/8 unit load) at 20Mbps
Full Fail-safe Receiver (Open, Short, Terminated)
Wide Supply Voltage 3V to 5.5V
Bus-Pin Protection:
±18 kV HBM ESD
±15 kV IEC61000-4-2 Contact Discharge
±15 kV IEC61000-4-2 Air Discharge
⚫
–40°C
to 125°C Operation Temperature Range
⚫
Communication Infrastructure
Description
The TPT481 are IEC61000 ESD protected, 3.0V to 5.5V
powered transceivers that meet the RS-485 and RS-422
standards for balanced communication.
Transmitters in this family deliver exceptional differential output
voltages into the RS-485 required 54Ω load. These 20Mbps
devices have very low bus currents so they present a true “1/8
unit load” to the RS-485 bus. This allows up to 256 transceivers
on the network without using repeaters. Receiver (Rx) inputs
feature a “Full Fail-Safe” design, which ensures a logic high Rx
output if Rx inputs are floating, shorted, or on a terminated but
undriven bus.
TPT481 is designed for half-duplex RS485, and support SOP8，
MSOP8 and DFN3X3-8L package, which is characterized from
–40°C to 125°C.
Applications
⚫
⚫
Motor Drives
Industrial Control
Device Table
Part
TPT481
Duplex
Half
Enable
Yes
Data Rate
20Mbps
Nodes
256
Simplified Schematic
TPT481 Block Diagram
TPT481, TPT487
TPT482, TPT488
TPT481 Network
TPT482A, TPT488A
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Rev. B
TPT481
3.0V to 5.5V RS-485 Transceivers
Revision History
Date
2019/4/8
2019/8/6
2019/9/3
2019/9/26
2020/3/24
2020/5/16
Revision
Rev. Pre 0.1
Rev. Pre 0.2
Rev. Pre 0.3
Rev. 0
Rev. A
Rev. B
Notes
Definition Version
Update ESD data
Update Electrical data
Final version
Update A/B pin absolute rating, VID and VI recommended value
Update HBM level to 18kV
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2 / 12
Rev. B
TPT481
3.0V to 5.5V RS-485 Transceivers
Pin Configuration and Functions
Pin Table
Pin
No.
1
2
3
4
5
6
7
8
R
/RE
DE
D
GND
A
B
V
CC
Digital output
Digital input
Digital input
Digital input
Ground
Bus input/output
Bus input/output
Power
Receiver Output.
Receiver Output Enable.
Driver Output Enable.
Driver Input.
Ground.
Noninverting Receiver Input A and Noninverting Driver Output A.
Inverting Receiver Input B and Inverted Driver Output B.
Power Supply.
Pin Name
I/O
Description
Functional Table
Driver Function Table
Input
D
H
L
X
X
OPEN
X = don’t care
Z = high impedance
Enable
DE
H
H
L
OPEN
H
Outputs
A
H
L
Z
Z
H
Outputs
B
L
H
Z
Z
L
Actively drives bus High
Actively drives bus Low
Driver disabled
Driver disabled by default
Actively drives bus High by default
Description
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3 / 12
Rev. B
TPT481
3.0V to 5.5V RS-485 Transceivers
Receiver Function Table
Input
A-B
>-50mV
-200mV<Input<-50mV
<-200mV
X
X
Open
Short
Idle(Terminated)
X = don’t care
Z = high impedance
Input
/RE
L
L
L
H
Open
L
L
L
Output
R
H
?
L
Z
Z
H
H
H
Receive valid bus High
Indeterminate bus state
Receive valid bus Low
Receiver disabled
Receiver disabled in default
Fail-safe high output
Fail-safe high output
Fail-safe high output
Description
Order Information
Model Name
TPT481
TPT481
TPT481
Order Number
TPT481L1-SO1R
TPT481-VS1R
TPT481L1-DF6R
Package
8-Pin SOP
8-Pin MSOP
8-Pin DFN3X3
MSL Level
MSL1
MSL3
MSL1
Transport Media, Quantity
Tape and Reel 4,000
Tape and Reel 3,000
Tape and Reel 4,000
Marking
Information
T481
T481
T481
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Rev. B
TPT481
3.0V to 5.5V RS-485 Transceivers
Absolute Maximum Ratings
Parameters
V
CC
to GND
Voltage at Logic pin: D, DE, /RE, R
Voltage at Bus pin: A, B
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec)
Rating
-0.3V to +7V
-0.3V to V
CC
+ 0.3V
-15V to +15V
-40°C to 125°C
-65°C to 150°C
150°C
260°C
(1) Stresses beyond the
Absolute Maximum Ratings
may cause permanent damage to the device. These are stress ratings only, which do not imply
functional operation of the device at these or any other conditions beyond those indicated under
Recommended Operating Conditions.
Recommended Operating Conditions
Over operating free-air temperature range (unless otherwise noted)
MIN
V
CC
V
I
V
IH
Supply voltage
Input voltage at any bus terminal
(1)
High-level input voltage (driver, driver enable, and receiver enable
inputs)
Low-level input voltage (driver, driver enable, and receiver enable inputs)
Differential input voltage
Differential load resistance
Operating ambient temperature
Junction temperature
3.0
-7
NOM
MAX
5.5
12
UNIT
V
V
2
V
CC
V
V
IL
V
ID
R
L
T
A
T
J
(1)
0
-7
54
-40
-40
0.8
12
V
V
Ω
125
150
°C
°C
The algebraic convention, in which the least positive (most negative) limit is designated as minimum is used in this data sheet.
ESD Rating
Value
IEC-61000-4-2, Contact Discharge
IEC-61000-4-2, Air-Gap Discharge
Bus Pin
Bus Pin
Bus Pin
HBM, per ANSI/ESDA/JEDEC JS-001 / ANSI/ESD STM5.5.1
All Pin Except Bus Pin
CDM, per ANSI/ESDA/JEDEC JS-002
All Pin
4
1.5
kV
kV
15
15
18
Unit
kV
kV
kV
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Rev. B
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