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TP8485E Datasheet Preview

TP8485E Datasheet

Full Fail-Safe RS-485 Transceiver

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3PEAK
TP8485E
± 18K ESD Protection, Full Fail-Safe RS-485 Transceiver
Features
Description
Exceeds Requirements of EIA-485 Standard
Hot Plug Circuitry - Tx and Rx Outputs Remain
Three-State During Power-up/Power-down
Data Rate: Up to 250 kbps
Full Fail-safe (Open, Short, Terminated)
Receivers
Up to 256 Nodes on a Bus (1/8 unit load)
Wide Supply Voltage 3V to 5.5V
SOIC-8 Package for Backward Compatibility
Bus-Pin Protection:
±18 kV HBM protection
Applications
E-Metering Networks
Industrial Automation
HVAC Systems
Process Control
DMX512-Networks
Battery-Powered Applications
The TP8485E are 3V~5.5V powered transceivers that
meet the RS-485 and RS-422 standards for balanced
communication. Driver outputs and receiver inputs are
protected against ±18kV ESD strikes without latch-up.
Transmitters in this family deliver exceptional differential
output voltages (2.5V min/5Vcc), into the RS-485 required
54Ω load, for better noise immunity, or to allow up to eight
120Ω terminations in “star” topologies. These 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. Rx
outputs feature high drive levels - typically 25mA @ VOL
= 1V (to ease the design of optocoupled isolated
interfaces).
The TP8485E is available in an SOIC-8 and MSOP-8
package, and is characterized from 40°C to 125°C.
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property of
their respective owners.
Pin Configuration (Top View)
TP8485E
8-Pin SOIC/MSOP
-S and -V Suffixes
R1
/RE 2
DE 3
D4
8 VCC
7 B/Z
6 A/Y
5 GND
Exceptional Tx Drives Up To 256 Loads While
Still Delivering 2.5V VOD
100
90
80
70
RD=15Ω
60
+25
+85
50
40 RD=54Ω
30 RD=20Ω
20
RD=100Ω
10
0
0.5 1 1.5 2 2.5 3
Differential Output Voltage (V)
3.5
www.3peakic.com.cn
Rev. C
1




3PEAK

TP8485E Datasheet Preview

TP8485E Datasheet

Full Fail-Safe RS-485 Transceiver

No Preview Available !

TP8485E
± 18K ESD Protection, Full Fail-Safe RS-485 Transceiver
Order Information
Model Name
TP8485E
TP8485E
Order Number
TP8485E-SR
TP8485E-VR
Package
8-Pin SOIC
8-Pin MSOP
Transport Media, Quantity
Tape and Reel, 4,000
Tape and Reel, 3,000
INPUT
D
ENABLE
DE
H
L
X
X
OPEN
H
H
L
OPEN
H
OUTPUTS
AB
HL
LH
ZZ
ZZ
HL
DRIVER PIN FUNCTIONS
DESCRIPTION
NORMAL MODE
Actively drives bus High
Actively drives bus Low
Driver disabled
Driver disabled by default
Actively drives bus High
DIFFERENTIAL
INPUT
VID = VA VB
ENABLE
/RE
VIT+ < VID
VIT< VID < VIT+
VID < VIT
X
X
Open, short, idle Bus
L
L
L
H
OPEN
L
RECEIVER PIN FUNCTIONS
OUTPUT
R
H
?
L
Z
Z
H
DESCRIPTION
NORMAL MODE
Receive valid bus High
Indeterminate bus state
Receive valid bus Low
Receiver disabled
Receiver disabled
Indeterminate bus state
Marking
Information
TP8485E
TP8485E
2 Rev. C
www.3peakic.com.cn


Part Number TP8485E
Description Full Fail-Safe RS-485 Transceiver
Maker 3PEAK
Total Page 15 Pages
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