Datasheet
RAA788170, RAA788172, RAA788173, RAA788175, RAA788176, RAA788178
3.3V, Full Fail-Safe, Low-Power, RS-485 Transceivers with 3kV EFT Immunity and 15kV ESD Protection
The RAA78817x family (RAA788170, RAA788172,
RAA788173, RAA788175, RAA788176, RAA788178)
▪ IEC61000 ESD protection on RS-485 I/O pins: ±15kV
of 3.3V powered single transceivers feature high
Features
• Class 3 ESD level on all other pins: >7kV HBM
output drive and high EFT and ESD protection. The
▪ ±3kV EFT immunity of bus I/O pins
devices are immune to ±3kV IEC61000-4-4 EFT
transients and withstand ±15kV IEC61000-4-2 ESD
strikes without latch-up. These devices have low bus
currents (+125µA/-100µA), so they present a true 1/8
unit load to the RS-485 bus. This allows up to 256
transceivers on the network without violating the
RS-485 specification 32 unit load maximum, and
without using repeaters. For example, in a remote
utility meter reading system, individual meter readings
are routed to a concentrator using an RS-485
network, so the high allowed node count minimizes
the number of repeaters required.
▪ Full fail-safe (open, short, terminated/floating)
receivers
▪ Hot plug - Tx and Rx outputs remain three-state
during power-up
▪ True 1/8 unit load allows up to 256 devices on the
bus
▪ Single 3.3V supply
▪ High data rates: up to 20Mbps
▪ Low quiescent supply current: 800µA (Max)
• Ultra low shutdown supply current: 10nA
Receiver (Rx) inputs feature a Full Fail-Safe design,
which ensures a logic high Rx output if Rx inputs are
floating, shorted, or terminated but undriven.
▪ -7V to +12V common-mode input/output voltage
range
▪ Half and full duplex pinouts
Hot Plug circuitry ensures that the Tx and Rx outputs
remain in a high impedance state while the power
supply stabilizes.
▪ Three state Rx and Tx outputs available
▪ Current limiting and thermal shutdown for driver
overload protection
The RAA788170 through RAA788175 use slew rate
limited drivers which reduce EMI, and minimize
reflections from improperly terminated transmission
lines, or unterminated stubs in multidrop and
multipoint applications. Slew rate limited versions also
include receiver input filtering to enhance noise
immunity in the presence of slow input signals.
▪ Tiny MSOP packages consume 50% less board
space
▪ Pb-free (RoHS compliant)
Applications
▪ Automated utility meter reading systems
▪ High node count systems
The RAA788170, RAA788173, and RAA788176 are
configured for full duplex (separate Rx input and Tx
output pins) applications. The half duplex versions
multiplex the Rx inputs and Tx outputs to allow
transceivers with output disable functions in 8 Ld
packages.
▪ Field bus networks
▪ Security camera networks
▪ Building environmental control/lighting systems
▪ Industrial/process control networks
Table 1. Summary of Features
Hot
RX/TX
Pin
Part
Number
Data Rate
(Mbps)
Slew-Rate
Limited?
# Devices
on Bus
Quiescent
(µA)
Low Power
Shutdown?
Duplex
I
CC
Plug?
Enable?
Count
RAA788170
RAA788172
RAA788173
RAA788175
RAA788176
RAA788178
Full
Half
Full
Half
Full
Half
0.25
0.25
0.5
0.5
20
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
256
256
256
256
256
256
Yes
Yes
Yes
Yes
Yes
Yes
510
Yes
Yes
Yes
Yes
Yes
Yes
10, 14
510
510
510
510
510
8
10, 14
8
10, 14
8
20
No
R15DS0017EU0101 Rev.1.01
Oct 2, 2023
Page 1
© 2022-2023 Renesas Electronics
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