ST3485EB, ST3485EC
ST3485EI, ST3485EIY
Datasheet
3.3 V powered, 15 kV ESD protected, up to 12 Mbps RS-485/ RS-422 transceiver
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
ESD protection
–
±15 kV IEC 61000-4-2 air discharge
–
±8 kV IEC 61000-4-2 contact discharge
Operate from a single 3.3 V supply - no charge pump required
Interoperable with 5 V logic
1 µA low current shutdown mode max.
Guaranteed 12 Mbps data rate
-7 to 12 V common mode input voltage range
Half duplex versions available
Industry standard 75176 pinout
Current limiting and thermal shutdown for driver overload protection
Guaranteed high receiver output state for floating inputs with no signal present
Allow up to 64 transceivers on the bus
Available in SO8 package
Automotive grade (ST3485EIY)
Description
The ST3485EB, ST3485EC, ST3485EI and ST3485EIY devices are ±15 kV ESD
protected, 3.3 V low power transceiver for RS-485 and RS-422 communications.
These devices contain one driver and one receiver in half duplex configuration.
Product status link
ST3485EB, ST3485EC, ST3485EI and
ST3485EIY
These devices transmit and receive at a guaranteed data rate of at least 12 Mbps.
All transmitter outputs and receiver inputs are protected to ±15 kV IEC 61000-4-2 air
discharge.
The driver is short-circuit current limited and is protected against excessive power
dissipation by thermal shutdown circuitry that places the driver outputs into a high
impedance state.
DS2947 - Rev 12 - March 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Pin configuration
1
Pin configuration
Figure 1. Pin connections
RO 1
8
VCC
RE 2
7
B
DE
3
6
A
DI
4
5
GND
Table 1. Pin description
DS2947 - Rev 12
Pin n°
Symbol
Name and function
1
RO
Receiver output. If A > B by 200 mV, RO will be high; if A < B by 200 mV, RO will be low.
2
RE
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is
high. If RE is high and DE is low, the device will enter a low power shutdown mode.
3
DE
Driver output enable. The driver outputs are enabled by bringing DE high. They are high
impedance when DE is low. If RE is high DE is low, the device will enter a low-power
shutdown mode. If the driver outputs are enabled, the part functions as line driver, while
they are high impedance, it functions as line receivers if RE is low.
4
DI
Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI
forces output A high and output B low.
5
GND
6
A
Non-inverting receiver input and non-inverting driver output.
7
B
Inverting receiver input and inverting driver output.
8
VCC
Ground.
Supply voltage: VCC = 3 V to 3.6 V.
page 2/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Truth tables
2
Truth tables
Table 2. Truth table (driver)
Inputs
RE
DE
X
H
L
H
L
Outputs
DI
B
A
H
L
H
L
H
L
X
Z
Z
Mode
Normal
Shutdown
Note: X = “don’t care”; Z = high impedance
Table 3. Truth table (receiver)
Inputs
RE
L
DE
L
Output
A-B
RO
≥ 0.2 V
H
≤ -0.2 V
L
Inputs open
H
X
Z
H
Mode
Normal
Shutdown
Note: X = “do not care”; Z = high impedance
DS2947 - Rev 12
page 3/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Maximum ratings
3
Maximum ratings
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation
under these condition is not implied.
Table 4. Absolute maximum ratings
Symbol
Parameter
Value
Unit
VCC
Supply voltage
7
V
VI
Control input voltage ( RE ,
DE)
-0.3 to 7
V
VDI
Driver input voltage (DI)
-0.3 to 7
V
VDO
Driver output voltage (A, B)
±14
V
VRI
Receiver input voltage (A, B)
±14
V
VRO
Receiver output voltage (RO)
-0.3 to (VCC + 0.3)
V
Rthj-a
Junction-ambient
125
°C/W
HBM: human body model for
the line inputs (A and B) (1)
12
HBM: human body model for
the logic inputs (DI, DE, RE )
ESD
4
(1)
HBM: human body model for
all other pins (1)
CDM: charged device model
(2)
kV
2
1.5
1. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin
combinations with other pins floating.
2. Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to
ground.
DS2947 - Rev 12
page 4/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Electrical characteristics
4
Electrical characteristics
Table 5. Electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol
ISUPPLY
Parameter
VCC power supply current
Test conditions
No load, DI = 0 V or VCC
Min.
DE = VCC, RE = 0 V
or VCC
DE = 0 V, RE = 0 V
ISHDN
Shutdown supply current
—
DE = 0 V, RE = VCC, DI = 0 V or VCC
Typ.
Max.
1.3
2.2
1.2
1.9
0.002
1
Unit
mA
µA
Table 6. Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
the ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C)
Symbol
Parameter
Test conditions
VIL
Input logic threshold low
DE, DI, RE
VIH
Input logic threshold high
DE, DI, RE
IIN1
Logic input current
DE, DI, RE
IIN2
Input current (A, B)
DE = 0 V, VCC= 0 or 3.6 V
Min.
Typ.
Max.
1.3
0.8
2
±2.0
VIN = 12 V
1
VIN = -7 V
-0.8
Unit
V
µA
mA
Table 7. Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
the ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C)
Symbol
VOD
Parameter
Differential drive output
Test conditions
Min.
RL= 100 Ω (RS-422) Figure 2. Driver and VOC test
load
2
RL= 54 Ω (RS-485) Figure 2. Driver and VOC test load
1.5
RL= 60 Ω (RS-485)Figure 3. Driver VOD with varying
common mode voltage test load
1.5
Typ.
Max.
—
0.2
∆VOD
Change in magnitude of driver
differential output voltage for
complementary output states (1)
RL= 54 Ω or 100 ΩFigure 2. Driver and VOC test load
VOC
Driver common mode output
voltage
RL= 54 Ω or 100 ΩFigure 2. Driver and VOC test load
3
∆VOC
Change in magnitude of driver
common mode output voltage(1)
RL= 54 Ω or 100 ΩFigure 2. Driver and VOC test load
0.2
IOSD
Driver short-circuit output current
Unit
V
±250
mA
1. ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
DS2947 - Rev 12
page 5/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Electrical characteristics
Table 8. Receiver electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C
for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VTH
Receiver differential threshold
voltage
VCM = -7 V to 12 V, DE = 0
-0.2
0.2
V
∆VTH
Receiver input hysteresis
VCM = 0 V
VOH
Receiver output high voltage
IOUT = -4 mA, VID = 200 mV (Figure 4. Receiver
VOH and VOL test circuit)
VOL
Receiver output low voltage
IOUT = 4 mA, VID = -200 mV (Figure 4. Receiver
VOH and VOL test circuit)
0.4
IOZR
3-state (high impedance) output
current at receiver
VCC = 3.6 V, VO = 0 V to VCC
±1
RRIN
Receiver input resistance
VCM = -7 V to 12 V
24
IOSR
Receiver short-circuit current
VRO = 0 V to VCC
7
70
mV
2
V
µA
kΩ
60
mA
Table 9. Driver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for the ST3485ECDR, TA = -40 to 85 °C for
the ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C)
Symbol
DR
Parameter
Test conditions
Maximum data rate
Min.
12
Typ.
Max.
15
Mbps
Differential output delay
RL= 60 Ω, CL = 15 pF Figure 5. Drive
differential output delay transition time test circuit
Figure 6. Drive differential output delay transition
time waveform
18
30
tTD
Differential output transition time
RL= 60 Ω, CL = 15 pF Figure 5. Drive
differential output delay transition time test circuit
Figure 6. Drive differential output delay transition
time waveform
12
20
tPLH tPHL
Propagation delay
RL= 27 Ω, CL = 15 pF Figure 9. Drive
propagation time test circuit Figure 10. Drive
propagation time waveform
18
30
tPDS
|tPLH - tPHL| driver propagation
delay skew (1)
RL= 27 Ω, CL = 15 pF Figure 9. Drive
propagation time test circuit Figure 10. Drive
propagation time waveform
2
5
tPZL
Output enable time
RL= 110 Ω Figure 11. Drive enable and
disable times test circuit (pull-up configuration)
Figure 12. Drive enable and disable times
waveforms (pull-up configuration)
19
35
tPZH
Output enable time
RL= 110 Ω Figure 7. Drive enable and
disable times test circuit (pull-down configuration)
Figure 8. Drive enable and disable times
waveforms (pull-down configuration)
30
50
tPHZ
Output disable time
RL= 110 Ω Figure 7. Drive enable and
disable times test circuit (pull-down configuration)
Figure 8. Drive enable and disable times
waveforms (pull-down configuration)
19
35
Output disable time
RL= 110 Ω Figure 11. Drive enable and
disable times test circuit (pull-up configuration)
Figure 12. Drive enable and disable times
waveforms (pull-up configuration)
30
50
tDD
tPLZ
DS2947 - Rev 12
Unit
ns
page 6/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Electrical characteristics
Symbol
Parameter
tSKEW
Differential output delay skew
tPSH
Driver enable from shutdown to
output high
Driver enable from shutdown to
output low
tPSL
Test conditions
Min.
Typ.
Max.
1
3
RL = 110 Ω Figure 7. Drive enable and
disable times test circuit (pull-down configuration)
Figure 8. Drive enable and disable times
waveforms (pull-down configuration)
30
50
RL = 110 Ω Figure 11. Drive enable and
disable times test circuit (pull-up configuration)
Figure 12. Drive enable and disable times
waveforms (pull-up configuration)
19
Unit
ns
35
1. Measured on |tPLH(A)-tPHL(A)| and |tPLH(B)-tPHL(B)|.
Table 10. Receiver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C
for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol
Parameter
Test conditions
tRPLH, tRPHL
Min.
Typ.
Max.
Propagation delay
VID = 0 V to 3 V, CL = 15 pF (Figure 13. Receiver
propagation delay time test circuit and
Figure 14. Receiver propagation delay time
waveforms)
30
50
tRPDS
|tRPLH - tRPHL| receiver
propagation delay skew
VID = 0 V to 3 V, CL = 15 pF (Figure 13. Receiver
propagation delay time test circuit and
Figure 14. Receiver propagation delay time
waveforms)
1
3
tPRZL
Receiver output enable time to
low level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 17. Receiver
enable and disable times waveform (test 2))
10
20
tPRZH
Receiver output enable time to
high level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 16. Receiver
enable and disable times waveform (test 1))
10
20
tPRHZ
Receiver output disable time
from high level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 18. Receiver
enable and disable times waveform (test 3))
10
20
tPRLZ
Receiver output disable time
from low level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 19. Receiver
enable and disable times waveform (test 4))
10
20
tPRSH
Receiver output enable time
from shutdown to high level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 16. Receiver
enable and disable times waveform (test 1))
10
20
tPRSL
Receiver output enable time
from shutdown to low level
CL = 15 pF (Figure 15. Receiver enable and
disable times test circuit and Figure 17. Receiver
enable and disable times waveform (test 2))
20
40
Unit
ns
—
µs
Notes:
1. ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
2. Measured on |tPLH(A) - tPHL(A)| and |tPLH(B) - tPHL(B)|.
3. The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80
ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are
guaranteed to have entered shutdown.
DS2947 - Rev 12
page 7/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
5
Test circuits and typical characteristics
Figure 2. Driver and VOC test load
RL
D
2
VOD
RL
VCC
VOC
2
Figure 3. Driver VOD with varying common mode voltage test load
375 Ω
VCM = -7 to 12 V
D
VOD
VCC
RL
375 Ω
Figure 4. Receiver VOH and VOL test circuit
VID
R
VOL
0V
IOL (+) VOH
IOL (-)
Figure 5. Drive differential output delay transition time test circuit
IN
(1)
VCC
DS2947 - Rev 12
OUT
D
CL
RL = 60 Ω
CL = 15 pF
(2)
page 8/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
1.
The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns, ZO = 50 Ω.
2.
CL includes probe and stray capacitance
Figure 6. Drive differential output delay transition time waveform
3V
IN
1.5 V
1.5 V
90 %
OUT
0V
tDD
tDO
2V
90 %
50 %
50 %
10 %
10 %
t TD
-2 V
t TD
Figure 7. Drive enable and disable times test circuit (pull-down configuration)
S1
0 V or 3 V
OUT
D
CL = 50 pF
(1)
IN
1.
2.
(2)
RL = 110 Ω
The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
CL includes probe and stray capacitance
Figure 8. Drive enable and disable times waveforms (pull-down configuration)
3V
IN
1.5 V
1.5 V
0V
tPZH or tPSH
tPHZ
(1)
0.25 V
OUT
VOH
VOM
0V
1.
DS2947 - Rev 12
tPZH is valid if the driver is initially disabled ( RE is high), tPSH is valid if the driver is initially in shutdown
mode (RE is low).
page 9/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
Figure 9. Drive propagation time test circuit
VOM = (VOH = VOL)/2 = 1.5 V
RL = 27 Ω
S1
IN
(1)
OUT
D
CL = 15 pF
(2)
VCC
1.
2.
The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
CL includes probe and stray capacitance
Figure 10. Drive propagation time waveform
3V
IN
1.5 V
1.5 V
0V
t PLH
t PHL
VOH
OUT A
VOM
VOM
VOL
t PHL
t PLH
VOH
VOM
OUT B
VOM
VOL
Figure 11. Drive enable and disable times test circuit (pull-up configuration)
VCC
RL = 110 Ω
S1
0 V or 3 V
IN
DS2947 - Rev 12
(1)
OUT
D
CL = 50 pF
(2)
page 10/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
1.
2.
The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
CL includes probe and stray capacitance
Figure 12. Drive enable and disable times waveforms (pull-up configuration)
3V
IN
1.5 V
1.5 V
0V
t PLZ
(1)
tPZL or tPSL
VCC
OUT
VOM
0.25 V
1.
VOL
tPZL is valid if the driver is initially disabled ( RE is high), tPSL is valid if the driver is initially in shutdown mode
(RE is low).
Figure 13. Receiver propagation delay time test circuit
IN
(1)
VID
R
OUT
CL = 1.5 pF
(2)
1.5 V
0V
1.
2.
DS2947 - Rev 12
The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
CL includes probe and stray capacitance
page 11/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
Figure 14. Receiver propagation delay time waveforms
3.0 V
IN
1.5 V
1.5 V
0V
t RPLH
t RPHL
VCC
OUT
VOM
VOM
VOM = VCC/2
0V
Figure 15. Receiver enable and disable times test circuit
OUT
1.5 V
S3
-1.5 V
S1
VID
1 kΩ
R
VCC
S2
(2)
CL
IN
1.
2.
(1)
The input pulse is supplied by a generator with the following characteristics: PRR = 250 kHz, 50 % duty
cycle, tr ≤ 6.0 ns.
CL includes probe and stray capacitance
Figure 16. Receiver enable and disable times waveform (test 1)
IN
1.5 V
3V
0V
t PRZH
t PRSH
OUT
S1 open
S2 closed
S3 = 1.5 V
VOH
1.5 V
0V
DS2947 - Rev 12
page 12/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
Figure 17. Receiver enable and disable times waveform (test 2)
3V
IN
1.5 V
S1 closed
S2 open
S3 = -1.5 V
0V
t PRZL
t PRSL
VCC
1.5 V
OUT
VOL
Figure 18. Receiver enable and disable times waveform (test 3)
3V
IN
1.5 V
S1 open
S2 closed
S3 = 1.5 V
0V
t PRHZ
VOH
VOH - 0.25 V
OUT
0V
Figure 19. Receiver enable and disable times waveform (test 4)
3V
IN
1.5 V
S1 closed
S2 open
S3 = -1.5 V
0V
t PRLZ
VCC
OUT
0.25 V
DS2947 - Rev 12
VOL
page 13/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
Figure 20. Receiver output current vs. output low voltage
Figure 21. Receiver output current vs. output high voltage
IOH(mA)
25
0.0
-2
20
-4
15
-6
-8
Vcc=3.3 V
Ta = 25°C
-10
10
-12
-14
5
-16
-18
-20
-4
-3.5 -3
-2.5
-2 -1.5 -1
VOH(V)
Figure 22. Low level driver output capability
Figure 23. High level driver output capability
Figure 24. Receiver input characteristics
Figure 25. Driver short-circuit current (test 1)
0.3
0.2
0.1
0
-0.1
-0.2
DS2947 - Rev 12
page 14/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Test circuits and typical characteristics
Figure 26. Driver short-circuit current (test 2)
IOSD (mA)
140
120
100
80
60
40
20
DS2947 - Rev 12
page 15/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Package information
6
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages,
depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product
status are available at: www.st.com. ECOPACK is an ST trademark.
6.1
SO8 package information
Figure 27. SO8 package outline
Table 11. SO8 package mechanical data
Dimensions
Millimeters
Ref.
Min.
Typ.
A
Max.
Min.
Typ.
1.75
0.25
Max.
0.069
A1
0.10
A2
1.25
b
0.28
0.48
0.011
0.019
c
0.17
0.23
0.007
0.010
D
4.80
4.90
5.00
0.189
0.193
0.197
E
5.80
6.00
6.20
0.228
0.236
0.244
E1
3.80
3.90
4.00
0.150
0.154
0.157
e
0.004
0.010
0.049
1.27
0.050
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
L1
k
ccc
DS2947 - Rev 12
Inches
1.04
0°
0.040
8°
0.10
0°
8°
0.004
page 16/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
SO8 packing information
6.2
SO8 packing information
Figure 28. SO8 tape and reel outline
1.
Drawing not to scale
Table 12. SO8 tape and reel mechanical data
Dimensions
mm
Symbol
Min.
Typ.
A
Max.
Min.
Typ.
330
12.8
D
20.2
0.795
N
60
2.362
Ao
8.1
Bo
13.2
—
Max.
12.992
C
T
DS2947 - Rev 12
Inches
0.504
22.4
0.519
—
0.882
8.5
0.319
0.335
5.5
5.9
0.216
0.232
Ko
2.1
2.3
0.082
0.090
Po
3.9
4.1
0.153
0.161
P
7.9
8.1
0.311
0.319
page 17/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Ordering information
7
Ordering information
Table 13. Order codes
Order code
Temperature range
ST3485ECDR
0 to 70 °C
ST3485EBDR
-40 to 85 °C
ST3485EIDT
-40 to 125 °C
ST3485EIYDT(1)
-40 to 125 °C (automotive grade)
Package
Packing
Marking
3485EC
SO8
2500 parts per reel
3485EB
3485EI
3485EIY
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 and Q 002 or equivalent.
DS2947 - Rev 12
page 18/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Revision history
Table 14. Document revision history
Date
Revision
Changes
20-Jun-2005
2
Mistake on table 12 tZL(SHDN) ms ==> µs.
30-Aug-2005
3
Remove (TRUE) on title, description has been updated in cover page. The VTH and
DVTH values are changed in table 10.
07-Apr-2006
4
Order codes updated.
12-Nov-2007
5
Added Table 1.
Updated Features (added SO-8 package, replaced human body model by ±15 kV IEC
61000-4-2 air discharge and IEC 1000-4-2 by IEC 61000-4-2).
Updated Description (renamed device to ST3485EB/EC, replaced human body model
by ±15 kV IEC 61000-4-2 air discharge).
Removed ST3485ECN device from Table 1.
Updated title of Table 6, cross-references, replaced human body model (HBM) by ±15
kV IEC 61000-4-2 air discharge and IEC 1000-4-2 by IEC 61000-4-2.
18-Dec-2013
6
Added notes below Table 9.
Updated Table 10 to Table 12 (updated data, cross-references).
Updated Figure 5 to Figure 16 (updated data, added notes below figures and
highlighted some parts of Figure 6 and Figure 12).
Removed DIP-8 package from Section 6: "Package information" and whole document.
Reformatted Section 6: "Package information" (added Figure 27, Figure 28, Table 13
and Table 14, reversed order of figures and table).
Minor corrections throughout document.
Added part number ST3485EIY
Added order code ST3485EIYDT and pointed out in Features it is automotive grade.
12-Jun-2015
7
Table 7 and Table 9 through to Table 12: replaced TA = -40 to 85 °C with TA = 0 to
70 °C (ST3485ECDR), TA = -40 to 85 °C (ST3485EBDR), and TA = -40 to 125 °C
(ST3485EIYDT).
Updated titles of figures 7, 8, 11, 12, 16, 17, 18, 19, 25, and 26
Table 5: added ESD information
15-Mar-2016
8
Removed "Table 6: ESD performance: transmitter outputs, receiver inputs (A, B)".
Added Section 7: "Ordering information"
Added new part number ST3485EI
Table 1: "Device summary": added information for new part number ST3485EI.
Removed " Note " icons throughout datasheet
02-Aug-2016
9
Section 4: "Electrical characteristics": updated TA information
Section 5: "Test circuits and typical characteristics": removed overline bar concerning
"RE is low" in note 1 of figures 8 and 12.
Table 14: "Order codes": added ST3485EIDT and updated footnote 1 (ST3485EIYDT
now qualified).
DS2947 - Rev 12
25-Aug-2016
10
Table 14: "Order codes": updated order codes ST3485EBDR and ST3485ECDR.
26-Oct-2017
11
Updated Figure 20: "Receiver output current vs. output low voltage", Figure 21:
"Receiver output current vs. output high voltage", Figure 24: "Receiver input
characteristics" and Figure 26: "Driver short-circuit current (test 2)".
05-Mar-2021
12
Updated Table 4. Absolute maximum ratings.
page 19/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
Contents
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2
Truth tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4
Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5
Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
7
6.1
SO8 package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2
SO8 tape and reel information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
DS2947 - Rev 12
page 20/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
DS2947 - Rev 12
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver and VOC test load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver VOD with varying common mode voltage test load . . . . . . . . .
Receiver VOH and VOL test circuit . . . . . . . . . . . . . . . . . . . . . . . . .
Drive differential output delay transition time test circuit . . . . . . . . . .
Drive differential output delay transition time waveform . . . . . . . . . .
Drive enable and disable times test circuit (pull-down configuration) .
Drive enable and disable times waveforms (pull-down configuration) .
Drive propagation time test circuit . . . . . . . . . . . . . . . . . . . . . . . . .
Drive propagation time waveform . . . . . . . . . . . . . . . . . . . . . . . . .
Drive enable and disable times test circuit (pull-up configuration) . . .
Drive enable and disable times waveforms (pull-up configuration) . . .
Receiver propagation delay time test circuit . . . . . . . . . . . . . . . . . .
Receiver propagation delay time waveforms. . . . . . . . . . . . . . . . . .
Receiver enable and disable times test circuit. . . . . . . . . . . . . . . . .
Receiver enable and disable times waveform (test 1). . . . . . . . . . . .
Receiver enable and disable times waveform (test 2). . . . . . . . . . . .
Receiver enable and disable times waveform (test 3). . . . . . . . . . . .
Receiver enable and disable times waveform (test 4). . . . . . . . . . . .
Receiver output current vs. output low voltage . . . . . . . . . . . . . . . .
Receiver output current vs. output high voltage . . . . . . . . . . . . . . . .
Low level driver output capability. . . . . . . . . . . . . . . . . . . . . . . . . .
High level driver output capability . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver input characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver short-circuit current (test 1) . . . . . . . . . . . . . . . . . . . . . . . . .
Driver short-circuit current (test 2) . . . . . . . . . . . . . . . . . . . . . . . . .
SO8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SO8 tape and reel outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 2
. 8
. 8
. 8
. 8
. 9
. 9
. 9
10
10
10
11
11
12
12
12
13
13
13
14
14
14
14
14
14
15
16
17
page 21/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Truth table (driver) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Truth table (receiver) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Receiver electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Driver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for the ST3485ECDR, TA = -40 to 85 °C for the
ST3485EBDR, TA = -40 to 125 °C for the ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical
values are referred to TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Receiver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for
ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values
are referred to TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SO8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SO8 tape and reel mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DS2947 - Rev 12
page 22/23
ST3485EB, ST3485EC, ST3485EI, ST3485EIY
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST
products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST
products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of
Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks. All other product or service
names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2021 STMicroelectronics – All rights reserved
DS2947 - Rev 12
page 23/23
工商网监
湘ICP备2023018690号
