Datasheet
R15DS0005EU0102 Rev.1.02 Page 1
Aug 19, 2021 © 2021 Renesas Electronics
The RAA78815x family (RAA788150, RAA788152,
RAA788153, RAA788155, RAA788156, RAA788158)
of 5V powered RS-485 transceivers features high
output drive and high EFT and ESD protection.
The devices are immune to ±5kV IEC61000-4-4 EFT
transients and withstand ±16.5kV IEC61000-4-2 ESD
strikes without latch-up.
The large output voltage of 3.1V typical into a 54Ω
load provides high noise immunity, and it enables the
drive of up to 8000ft long bus segments or eight 120Ω
terminations in a star topology.
These devices possess less than 125µA bus input
currents, therefore, constituting a true 1/8 unit load.
The high output drive combined with the low bus input
currents allows for the connection of up to 512
transceivers on the same bus.
The receiver inputs feature a full fail-safe design that
turns the receiver outputs high when the bus inputs
are open or shorted.
The RAA78815x family includes half and full-duplex
transceivers with active-high driver-enable pins and
active-low receiver enable pins. These transceivers
support data rates of 115kbps, 1Mbps, and 20Mbps
with a performance that is characterized from -40°C
to +85°C.
Features
â–ª High V
OD
: 3.1V (Typ) into R
D
= 54Ω
▪ ±5kV EFT immunity of bus I/O pins
▪ ±16.5kV ESD protection on bus I/O pins
â–ª Supported data rates: 115kbps, 1Mbps, 20Mbps
â–ª Full fail-safe outputs for open or shorted inputs
â–ª Hot plug capability
â–ª 1/8 Unit Load
â–ª Allows for up to 512 transceivers on the bus
▪ Low supply current (driver disabled): 550µA
â–ª Ultra-low shutdown current: 70nA
Applications
â–ª Industrial networks in factory automation
â–ª Building automation: lighting, elevators, HVAC
â–ª Industrial process control networks
â–ª Security camera networks
â–ª Networks with star topology
â–ª Long-haul networks in coal mines and oil rigs
â–ª High node-count networks
â–ª Automated utility e-meter reading systems
Figure 1. Typical Driver Output Performance of RAA78815xE Transceivers
R
L
=120Ω
R
L
=60Ω
R
L
=15Ω
R
L
=20Ω
120
100
60
40
0.0
140
80
20
Driver Output Voltage – V
OD
(V)
50 2341
Driver Output Current – I
OD
(mA)
20Mbps, 50m UTP, R
L
= 60Ω
20ns/DIV
3
2
1
0
-1
-2
-3
Standard
Transceiver
RAA788158
Driver Output Voltage – V
OD
(V)
RAA788150, RAA788152, RAA788153, RAA788155, RAA788156, RAA788158
Large 3V Output Swing, 5kV EFT, 16.5kV ESD, RS-485 Transceivers
R15DS0005EU0102 Rev.1.02 Page 2
Aug 19, 2021
RAA788150, RAA788152, RAA788153, RAA788155, RAA788156, RAA788158 Datasheet
Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Typical Operating Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Pin Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3 Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.4 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Test Circuits and Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6. Device Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.3 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.4 Device Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7. Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.1 Network Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 Transient Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.3 Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8. Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33