3PEAK
TP75176E
±15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Features
Description
High Data Rates: 10Mbps At 5V Supply
: 6Mbps At 3.3V Supply
13/14ns (Max) Tx/Rx Propagation Delays; 10ns
(Typ) Skew
Full Fail-safe (Open, Short, Terminated)
Receivers
Up to 32 Nodes on a Bus (1 unit load)
Wide Supply Voltage 3V to 5.5V
Low Quiescent Supply Current: 2.2 mA
-8V to +13V Common Mode Input Voltage Range
Bus-Pin Protection:
– ±15 kV HBM protection
– ±9 kV IEC61000-4-2 Contact Discharge
– +4 kV IEC61000-4-4 Fast Transient Burst
Pb-Free Plus Anneal Available (RoHS Compliant)
3PEAK’s TP75176E is a ±15kV HBM ESD Protected,
3V~5.5V powered, single transceiver that meets both the
RS-485 and RS-422 standards for balanced
communication. It also features the larger output voltage
and higher data rate - up to 10Mbps - required by high
speed PROFIBUS applications, and is offered in
Industrial and Extended Industrial (-40°C to +125°C)
temperature ranges.
This transceiver requires a 3V~5.5V tolerance supply,
and delivers at least a 2.1V differential output voltage on
5V supply condition. This translates into better noise
immunity(data integrity), longer reach, or the ability to
drive up to three 120Ω terminations in “star” or other
non-standard bus topologies, at the exceptional 10Mbps
data rate.
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. Rx outputs
feature high drive levels (typically >25mA @ VOL = 1V) to
ease the design of optically isolated interfaces.
The TP75176E is available in an SOP-8 and MSOP-8
package, and is characterized from –40°C to 125°C.
Applications
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property of
their respective owners.
®
PROFIBUS DP and FMS Networks
SCSI “Fast 40” Drivers and Receivers
Motor Controller/Position Encoder Systems
Factory Automation
Field Bus Networks
Industrial/Process Control Networks
Pin Configuration (Top View)
2V/div
Loopback Test At 10Mbps/5V
TP75176E
8-Pin SOP/MSOP
-S and -V Suffixes
1
8
VCC
RE
2
7
B/Z
DE
3
6
A/Y
5
GND
4
www.3peakic.com.cn
2V/div
RO
R
D
DI
Time (50ns/div)
Rev. B02
1
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Order Information
Model Name
Order Number
Package
Transport Media, Quantity
Marking
Information
TP75176E
TP75176E-SR
8-Pin SOP
Tape and Reel, 4,000
75176E
TP75176E
TP75176E-VR
8-Pin MSOP
Tape and Reel, 3,000
75176E
TP75176E
TP75176E-FR
8-Pin DFN
Tape and Reel, 4,000
75176
DRIVER PIN FUNCTIONS
INPUT
ENABLE
D
DE
OUTPUTS
A
DESCRIPTION
B
NORMAL MODE
H
H
H
L
Actively drives bus High
L
H
L
H
Actively drives bus Low
X
L
Z
Z
Driver disabled
X
OPEN
Z
Z
Driver disabled by default
OPEN
H
H
L
Actively drives bus High
RECEIVER PIN FUNCTIONS
DIFFERENTIAL
INPUT
ENABLE
OUTPUT
VID = VA – VB
/RE
R
DESCRIPTION
NORMAL MODE
2
VIT+ < VID
L
H
Receive valid bus High
VIT– < VID < VIT+
L
?
Indeterminate bus state
VID < VIT–
L
L
Receive valid bus Low
X
H
Z
Receiver disabled
X
OPEN
Z
Receiver disabled
Open, short, idle Bus
L
H
Indeterminate bus state
Rev. B.02
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Absolute Maximum Ratings
VDD to GND.......................................................................................................................................-0.3V to +7V
Input Voltages
DI, DE, RE………………………………………………………………………….…………………….....-0.3V to (VCC + 0.3V)
Input/Output Voltages
A/Y, B/Z, A, B, Y, Z………………………………………………………………………..………………. -15V to +15V
A/Y, B/Z, A, B, Y, Z (Transient Pulse Through 100Ω,
Note 1)………………………………………………………………………………………….……….…… ±100V
RO……………………………………………………………………………………………………………. -0.3V to (VCC +0.3V)
Short Circuit Duration
Y, Z…………………………………………………………………………………………………………….Continuous
ESD Rating………………………………………………………………………………………………….. See Specification Table
Recommended Operating Conditions
Note 2
Supply Voltage………………………………………………………………………………….…………….3V~5.5V
Temperature Range…………………………………………………………………………………….……-40°C to +125°C
Bus Pin Common Mode Voltage Range …………………………………………………………….…… -8V to +13V
Thermal Resistance, ΘJA (Typical)
8-Pin SOP Package ……………………………………………………………….…………………..……158°C/W
8-Pin MSOP Package …………………………………………………………….……………….…..……210°C/W
Maximum Junction Temperature (Plastic Package) ………………………………………….………….+150°C
Maximum Storage Temperature Range …………………………………………………………………. -65°C to +150°C
Note 1: Tested according to TIA/EIA-485-A, Section 4.2.6 (±100V for 15μs at a 1% duty cycle).
Note 2: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact
product reliability and result in failures not covered by warranty.
www.3peakic.com.cn
Rev. B.02
3
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Electrical Characteristics
Test Conditions: VCC = 5V, Over operating free-air temperature range(unless otherwise noted)
PARAMETER
CONDITIONS
RL = 54 Ω VCC = 5V
|VOD|
Driver differential-output voltage
magnitude
RL = 54 Ω with VA or
VB from –7 to +12 V,
VCC = 5V (RS-485)
RL = 54 Ω with VA or
VB from –7 to +12 V,
VCC = 3V (RS-485)
VIH
Logic Input High Voltage
DI, DE, RE
VIL
Logic Input Low Voltage
DI, DE, RE
⊿|VOD|
Change in magnitude of driver
differential-output voltage
RL = 54 Ω, CL=50 pF,
VOC(SS)
⊿VOC
Steady-stage common-mode
output voltage
Change in differential driver
common-mode output voltage
See Figure 1A
VCC = 5V
Center of two 27 Ω
load resistors
MIN
TYP
2.3
2.5
2.2
2.4
1.2
1.5
1
V
0.5
See Figure 1A
See Figure 1A
-0.02
-0.002
0.02
Vcc/20.2
VCC/2
Vcc/2
+0.2
-0.2
0
0.2
VOC(PP)
500
COD
Differential output capacitance
8
VIT+
Positive-going receiver
differential-input voltage threshold
VIT-
Negative-going receiver
differential-input voltage threshold
VHYS(1)
Receiver differential-input voltage
threshold hysteresis (VIT+ – VIT– )
VOH
Receiver high-level output voltage
IOH= -8 mA
VOL
Receiver low-level output voltage
IOL= 8 mA
II
Driver input, driver enable and
receiver enable input current
DI, DE, RE
IOZ
Receiver high-impedance output
current
VO = 0 V or VCC, /RE at VCC
|IOS|
Driver short-circuit output current
│IOS│ with VA or VB from –7 to +12 V
ICC
4
Bus input current(driver disabled)
Supply current(quiescent)
Rev. B.02
-200
4.500
-0.02
-10
V
V
mV
mV
-130
mV
75
mV
4.650
V
0.235
0.350
V
0.01
0.020
μA
0.005
0.02
μA
120
300
mA
VI= 12 V
VI= -7 V
V
pF
-50
VCC = 4.5 to 5.5 V or
VCC = 0 V, DE at 0 V
UNITS
V
Peak-to-peak driver
common-mode output voltage
II
MAX
1
-0.8
Driver and receiver
enabled
DE = VCC, /RE
= GND, No
LOAD
2.2
2.5
Driver enabled,
receiver disabled
DE = VCC, /RE
= VCC, No
LOAD
1.5
1.8
Driver disabled,
receiver enabled
DE = GND,
/RE = GND,
No LOAD
0.5
0.6
Driver and receiver
disabled
DE = GND,
/RE = VCC, D=
Vcc No LOAD
0.0012
0.002
mA
mA
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Switching CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
VOD ≥ ±1.5V, RL = 54Ω, CL = 100pF
(Figure 4)
10
TYP
MAX
UNITS
DRIVER
fMAX
Maximum Data Rate
tr, tf
Driver differential-output rise and
fall times
tPHL, tPLH
Driver propagation delay
tSK(P)
tPHZ, tPLZ
tPHZ, tPLZ
26
RL = 54 Ω, CL=50pF
See Figure 2
Driver pulse skew, |tPHL – tPLH|
ns
14
10
Driver disable time
Driver enable time
Mbps
50
Receiver enabled
See Figure 3
Receiver disabled
ns
10
ns
125
RECEIVER
tr, tf
Receiver output rise and fall times
tPHL, tPLH
Receiver propagation delay time
tSK(P)
Receiver pulse skew, |tPHL – tPLH|
10
tPHZ, tPLZ
Receiver disable time
28
tPZL(1),
tPZH(1)
tPZL(2),
tPZH(2)
3.4
CL=15 pF
See Figure 5
55
Driver enabled
See Figure 6
11
Driver disabled
See Figure 6
15
ns
ns
Receiver enable time
ns
ESD
IEC61000-4-2,Air-Gap Discharge
RS-485
Method
Pins (A, Y,
IEC61000-4-2, Contact Discharge
B, Z, A/Y,
Method
B/Z)
Human Body Model, From Bus Pins to
GND
All Other
Pins
www.3peakic.com.cn
Human Body Model, per MIL-STD-883
±15
kV
±9
kV
±15
kV
±2
kV
Rev. B.02
5
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Test Circuits and Waveforms
Vcc
RL/2
DE
Vcc
Z
DI
D
Z
DI
VOD
Y
375Ω
DE
D
VOD
RL=60Ω
Y
RL/2 VOC
375Ω
FIGURE 1A. VOD AND VOC
FIGURE 1B. VOD WITH COMMON MODE LOAD
FIGURE 1. DC DRIVER TEST CIRCUITS
CL=100pF
DE
Vcc
DI
Z
D
Y
3V
DI
1.5V
0V
tPLH
RDIFF
CL=100pF
tPHL
OUT(Z)
VOH
OUT(Y)
VOL
DIFF OUT(Y-Z)
SIGNAL
GENERATOR
1.5V
90%
+VOD
90%
10%
tR
10%
tF
-VOD
SKEW=|tPLH-tPHL|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE
DI
SIGNAL
GENERATOR
Z
500Ω
D
Y
SW
CL
VCC
GND
DE
PARAMETER
OUTPUT
RE
DI
3V
NOTE 10
CL
tZH,tZH(SHDN)
(pF)
NOTE 10
SW
OUT(Y,Z)
tHZ
Y/Z
X
1/0
GND
15
tLZ
Y/Z
X
0/1
VCC
15
tZL,tZL(SHDN)
tZH
Y/Z
0 (Note 9)
1/0
GND
100
NOTE 10
tZL
Y/Z
0 (Note 9)
0/1
VCC
100
tZH(SHDN)
Y/Z
1 (Note 12)
1/0
GND
100
tZL(SHDN)
Y/Z
1 (Note 12)
0/1
VCC
100
FIGURE 3A. TEST CIRCUIT
OUT(Y,Z)
1.5V
1.5V
0V
tHZ
OUTPUT HIGH
2.3V
VOL-0.5V VOH
0V
tLZ
2.3V
VCC
VOL+0.5V VOL
OUTPUT LOW
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
6
Rev. B.02
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Test Circuits and Waveforms(continue)
DE
Vcc
DI
+
Z
54Ω
D
Y
CD
VOD
-
3V
DI
0V
SIGNAL
GENERATOR
DIFF OUT(Y-Z)
FIGURE 4A. TEST CIRCUIT
+VOD
-VOD
0V
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER DATA RATE
RE
B
R
A
0V
RO
15pF
+1.5V
A
0V
0V
-1.5V
tPLH
SIGNAL
GENERATOR
VCC
RO
FIGURE 5A. TEST CIRCUIT
tPHL
1.5V
1.5V
0V
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER PROPAGATION DELAY AND DATA RATE
SIGNAL
GENERATOR
RE
B
GND
A
R
1kΩ
RO
VCC
SW
GND
15pF
NOTE 10
RE
PARAMETER
tHZ
DE
0
A
+1.5V
SW
tZH,tZH(SHDN)
GND
NOTE 10
RO
tLZ
0
-1.5V
VCC
tZH(Note 10)
0
+1.5V
GND
tZL,tZL(SHDN)
tZL(Note 10)
0
-1.5V
VCC
NOTE 10
tZH(SHDN)(Note 13)
0
+1.5V
GND
RO
tZL(SHDN)(Note 13)
0
-1.5V
VCC
FIGURE 6A. TEST CIRCUIT
3V
1.5V
1.5V
0V
tHZ
OUTPUT HIGH
1.5V
VOH-0.5V VOH
0V
tLZ
1.5V
VCC
VOL+0.5V VOL
OUTPUT LOW
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES
www.3peakic.com.cn
Rev. B.02
7
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Detailed Description
Application
RS-485 and RS-422 are differential (balanced) data transmission standards used for long haul or noisy environments. RS-422 is a
subset of RS-485, so RS-485 transceivers are also RS-422 compliant. RS-422 is a point-to-multipoint (multidrop) standard, which
allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. RS-485 is a true multipoint standard,
which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. To allow for multipoint operation,
the RS-485 specification requires that drivers must handle bus contention without sustaining any damage. Another important
advantage of RS-485 is the extended common mode range (CMR), which specifies that the driver outputs and receiver inputs
withstand signals that range from +12V to -7V. RS-422 and RS-485 are intended for runs as long as 4000’, so the wide CMR is
necessary to handle ground potential differences, as well as voltages induced in the cable by external fields.
Receiver (Rx) Features
TP75176E utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is better
than ±200mV, as required by the RS-422 and RS-485 specifications. Rx outputs feature high drive levels (typically 25mA @ VOL =
1V) to ease the design of optically coupled isolated interfaces. Rx inputs function with common mode voltages as great as ±7V
outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages are a realistic concern.
All the receivers include a “full fail-safe” function that guarantees a high level receiver output if the receiver inputs are unconnected
(floating), shorted together, or connected to a terminated bus with all the transmitters disabled. Receivers easily meet the data rates
supported by the corresponding driver, and all receiver outputs are three-stable via the active low RE input.
Driver (Tx) Features
TP75176E driver is a differential output device that delivers at least 2.5V across a 54Ω load (RS-485), and at least 2.8V across a
100Ω load (RS-422). The drivers feature low propagation delay skew to maximize bit width, and to minimize EMI, and all drivers are
three-stable via the active high DE input.
High Data Rate
RS-485/RS-422 are intended for network lengths up to 4000’, but the maximum system data rate decreases as the transmission
length increases. Devices operating at 10Mbps are limited to lengths less than 100’.
Twisted pair is the cable of choice for RS-485/RS-422 networks. Twisted pair cables tend to pick up noise and other
electromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receiver in this IC.
Proper termination is imperative to minimize reflections. In point-to-point, or point-to-multipoint (single driver on bus) networks, the
main cable should be terminated in its characteristic impedance (typically 120Ω) at the end farthest from the driver. In multi-receiver
applications, stubs connecting receivers to the main cable should be kept as short as possible. Multipoint (multi-driver) systems
require that the main cable be terminated in its characteristic impedance at both ends. Stubs connecting a transceiver to the main
cable should be kept as short as possible.
The TP75176E may also be used at slower data rates over longer cables, but there are some limitations. The Rx is optimized for
high speed operation, so its output may glitch if the Rx input differential transition times are too slow. Keeping the transition times
below 500ns, which equates to the Tx driving a 1000’ (305m) CAT 5 cable, yields excellent performance over the full operating
temperature range. For below test waveform, the transmitter was driven at 10Mps and/or with 100’ (31m) CAT 5 cable, the
transmitters were loaded with an RS-485 receiver in parallel with 54Ω.
8
Rev. B.02
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
5V
5V
RO
1
RE
2
7
DE
3
6
DI
4
R
8
VCC
100 nF
B/Z
54Ω
D
5
A/Y
GND
2V/div
2V/div
Figure 7. Loopback Test Circuit
DI
DI
2V/div
2V/div
RO
RO
Time (100ns/div)
Time (50ns/div)
Figure 8.
Loopback Test At 10Mbps/5V
Figure 9.
Loopback Test At 6Mbps/3V
Vcc
RO
VCC
1
R
8
VCC
B/Z
RE
2
7
DE
3
6
DI
4
100 nF
120 Ω
5
D
GND
5
A/Y
D
4
DI
6
3
DE
7
2
120 Ω
A/Y
Vcc B/Z
GND
VCC
100 nF
30M
CAT-5 CABLE
R
8
1
RE
RO
5V/div
DI = 10Mbps
5V/div
Figure 10. 10Mbps Data Rate With 30M CAT5 Cable Test Circuit
DI = 10 Mbps
5V/div
5V/div
RO
RO
Time (100ns/div)
Figure 11.
5V Driver And Receiver Five Pulse
Waveforms Driving 100 Feet (30 Meters)
www.3peakic.com.cn
Time (100ns/div)
Figure 12.
5V Driver And Receiver Single Pulse
Waveforms Driving 100 Feet (30 Meters)
Rev. B.02
9
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
2V/div
DI = 6 Mbps
2V/div
2V/div
2V/div
DI = 6 Mbps
RO
RO
Time (200ns/div)
Time (200ns/div)
Figure 13.
3.3V Driver And Receiver Five Pulse
Figure 14.
5V/div
DI = 5 Mbps
Waveforms Driving 100 Feet (30 Meters)
DI = 5 Mbps
5V/div
5V/div
5V/div
Pulse Waveforms Driving 100 Feet (30 Meters)
RO
3.3V Driver And Receiver Single
RO
Time (200ns/div)
Time (200ns/div)
Figure 15.
5V Driver And Receiver Five Pulse
Figure 16.
2V/div
2V/div
2V/div
DI = 3 Mbps
Waveforms Driving 100 Feet (30 Meters)
2V/div
Pulse Waveforms Driving 100 Feet (30 Meters)
RO
5V Driver And Receiver Single
DI = 3 Mbps
RO
Time (200ns/div)
Figure 17.
3.3V Driver And Receiver Four Pulse
Pulse Waveforms Driving 100 Feet (30 Meters)
10
Rev. B.02
Time (200ns/div)
Figure 18.
5V Driver And Receiver Single
Waveforms Driving 100 Feet (30 Meters)
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Full Fail-Safe
All the receivers include a “full fail-safe” function that guarantees a high level receiver output if the receiver inputs are unconnected
(floating), shorted together, or connected to a terminated bus with all the transmitters disabled. Receivers easily meet the data rates
supported by the corresponding driver, and all receiver outputs are three-stable via the active low RE input.
Hot Plug Function
When a piece of equipment powers up, there is a period of time where the processor or ASIC driving the RS-485 control lines (DE,
RE) is unable to ensure that the RS-485 Tx and Rx outputs are kept disabled. If the equipment is connected to the bus, a driver
activating prematurely during power-up may crash the bus. To avoid this scenario, the TP75176E devices incorporate a “Hot Plug”
function. Circuitry monitoring VCC ensures that, during power-up and power-down, the Tx and Rx outputs remain disabled,
regardless of the state of DE and RE, if VCC is less than ~2.5V. This gives the processor/ASIC a chance to stabilize and drive the
RS-485 control lines to the proper states.
COMPETITOR
FIGURE 19. Hot Plug Performance (TP75176E) vs Competitor Without Hot Plug Circuitry
ESD Protection
All pins on these devices include 2kV Human Body Model (HBM) ESD protection structures, but the RS-485 pins (driver outputs and
receiver inputs) incorporate advanced structures allowing them to survive ESD events in excess of ±15kV HBM and ±9kV (1/2
duplex) IEC61000-4-2. The RS-485 pins are particularly vulnerable to ESD strikes because they typically connect to an exposed port
on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might
destroy unprotected ICs. These new ESD structures protect the device whether or not it is powered up, and without degrading the
RS-485 common mode range of -8V to +13V. This built-in ESD protection eliminates the need for board level protection structures
(e.g., transient suppression diodes), and the associated, undesirable capacitive load they present.
Transient Protection
The bus terminals of the TP75176E transceiver family possess on-chip ESD protection against ±15 kV HBM and ±9 kV
IEC61000-4-2 contact discharge. The International Electrotechnical Commision (IEC) ESD test is far more severe than the HBM
ESD test. The 50% higher charge capacitance, CS, and 78% lower discharge resistance, RD of the IEC model produce significantly
higher discharge currents than the HBM model.
As stated in the IEC 61000-4-2 standard, contact discharge is the preferred transient protection test method. Although IEC air-gap
testing is less repeatable than contact testing, air discharge protection levels are inferred from the contact discharge test results.
www.3peakic.com.cn
Rev. B.02
11
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Figure 20.
HBM and IEC-ESD Models and Currents in Comparison (HBM Values in Parenthesis)
The on-chip implementation of IEC ESD protection significantly increases the robustness of equipment. Common discharge events
occur because of human contact with connectors and cables. Designers may choose to implement protection against longer
duration transients, typically referred to as surge transients. Figure 9 suggests two circuit designs providing protection against short
and long duration surge transients, in addition to ESD and Electrical Fast Transients (EFT) transients. Table 1 lists the bill of
materials for the external protection devices.
EFTs are generally caused by relay-contact bounce or the interruption of inductive loads. Surge transients often result from lightning
strikes (direct strike or an indirect strike which induce voltages and currents), or the switching of power systems, including load
changes and short circuits switching. These transients are often encountered in industrial environments, such as factory automation
and power-grid systems. Figure 10 compares the pulse-power of the EFT and surge transients with the power caused by an IEC
ESD transient. In the diagram on the left of Figure 10, the tiny blue blip in the bottom left corner represents the power of a 10-kV ESD
transient, which already dwarfs against the significantly higher EFT power spike, and certainly dwarfs against the 500-V surge
transient. This type of transient power is well representative of factory environments in industrial and process automation. The
diagram on the fright of Figure 10 compares the enormous power of a 6-kV surge transient, most likely occurring in e-metering
applications of power generating and power grid systems, with the aforementioned 500-V surge transient.
Figure 21. Power Comparison of ESD, EFT, and Surge Transients
In the case of surge transients, high-energy content is signified by long pulse duration and slow decaying pulse Power The electrical
energy of a transient that is dumped into the internal protection cells of the transceiver is converted into thermal energy. This thermal
12
Rev. B.02
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
energy heats the protection cells and literally destroys them, thus destroying the transceiver. Figure 11 shows the large differences
in transient energies for single ESD, EFT, and surge transients as well as for an EFT pulse train, commonly applied during
compliance testing.
Figure 22. Comparison of Transient Energies
Table 1. Bill of Materials
Device
Function
Order Number
Manufacturer
485
5-V, 250-kbps RS-485 Transceiver
TP75176E
R1, R2
10-Ω, Pulse-Proof Thick-Film Resistor
CRCW0603010RJNEAHP
Vishay
TVS
Bidirectional 400-W Transient Suppressor
CDSOT23-SM712
Bourns
TBU1, TBU2
Bidirectional
TBU-CA-065-200-WH
Bourns
MOV1, MOV2
200mA Transient Blocking Unit 200-V, MetalOxide Varistor
MOV-10D201K
Bourns
485
B
A
Figure 23.
485
3PEAK
B
A
Transient Protections Against ESD, EFT, and Surge Transients
The left circuit shown in Figure 12 provides surge protection of ≥ 500-V transients, while the right protection circuits can
withstand surge transients of 5 kV
www.3peakic.com.cn
Rev. B.02
13
TP75176E
Typical Performance Characteristics
100
Driver Output Current (mA)
90
80
70
+25 ℃
RD=15Ω
60
+85 ℃
50
RD=54Ω
40
RD=20Ω
30
20
RD=100Ω
10
0
1
1.5
2
2.5
3
3.5
Differential Output Voltage (V)
FIGURE 24. DRIVER OUTPUT CURRENT vs
VOLTAGE DIFFERENTIAL OUTPUT VOLTAGE
Output Current (mA)
4.5
RDIFF=100Ω
4
3.5
RDIFF=54Ω
3
2.5
2
1.5
1
0.5
0
0.5
100
90
80
70
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
D i f f eren t i al O u t p ut Vo l t age ( V)
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
-40
-20
0
20
40
60
80
100 120 140
T e m p e r a t u℃）
re (
FIGURE 25. DRIVER DIFFERENTIAL OUTPUT
vs TEMPERATURE
Y OR Z = LOW
Y OR Z = HIGH
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12
Output Voltage(V)
FIGURE 26. DRIVER OUTPUT CURRENT vs SHORT
14
Rev. B.02
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Package Outline Dimensions
SOP-8 (SOIC-8)
A2
C
θ
L1
A1
e
E
D
Symbol
E1
b
Dimensions In
In Millimeters
Inches
Min
Max
Min
Max
A1
0.100
0.250
0.004
0.010
A2
1.350
1.550
0.053
0.061
b
0.330
0.510
0.013
0.020
C
0.190
0.250
0.007
0.010
D
4.780
5.000
0.188
0.197
E
3.800
4.000
0.150
0.157
E1
5.800
6.300
0.228
0.248
e
www.3peakic.com.cn
Dimensions
1.270 TYP
0.050 TYP
L1
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
Rev. B.02
15
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Package Outline Dimensions
MSOP-8
Dimensions
Dimensions In
In Millimeters
Inches
Min
Max
Min
Max
A
0.800
1.200
0.031
0.047
A1
0.000
0.200
0.000
0.008
A2
0.760
0.970
0.030
0.038
b
0.30 TYP
0.012 TYP
C
0.15 TYP
0.006 TYP
D
2.900
e
0.65 TYP
E
2.900
3.100
0.114
0.122
E1
4.700
5.100
0.185
0.201
L1
0.410
0.650
0.016
0.026
θ
0°
6°
0°
6°
Symbol
E
E1
A
A2
e
b
D
3.100
0.114
0.122
0.026
A1
R1
R
θ
L1
16
Rev. B.02
L
L2
www.3peakic.com.cn
TP75176E
± 15kV ESD Protected, 10Mbps, Full Fail-safe, RS-485 Transceivers
Package Outline Dimensions
DFN-8
www.3peakic.com.cn
Rev. B.02
17
工商网监
湘ICP备2023018690号
