STMicroelectronics ST1480US Datasheet
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ST1480US
Datasheet
3.3 V powered, 15 kV ESD protected, up to 12 Mbps true RS-485/RS-422 transceiver
SO8
Product status link
ST1480US
Features
• ESD protection
– – ±15 kV human body model
– – ±8 kV IEC 1000-4-2 contact discharge
• Operates 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 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, shorted or terminated inputs with no signal present
• Allows up to 64 transceivers on the bus
Description
The ST1480US is ±15 kV ESD protected, 3.3 V low power transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST1480US transmits and receives at a guaranteed data rate of at least 12 Mbps. All transmitter outputs and receiver inputs are protected to ±15 kV using human body model. 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.
The ST1480US input has a true fail-safe feature that guarantees a logic high output if both inputs are open circuit, shorted together or in the presence of a termination with no signal on the bus.
DS13697 - Rev 1 - April 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
1
Pin configuration
Figure 1. Pin connections
ST1480US
Pin configuration
Table 1. Pin description
7
8
5
6
Pin Symbol
1
2
3
4
RO
RE
DE
Name and function
Receiver output. If A>B by 200 mV, RO is high; if A< B by 200 mV, RO is low.
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 enters a low power shutdown mode.
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 enters 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.
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.
GND Ground
A
B
Non-inverting receiver input and non-inverting driver output.
Inverting receiver input and inverting driver output.
VCC Supply voltage: VCC=3 V to 3.6 V.
DS13697 - Rev 1 page 2/21
ST1480US
Truth tables
2
Note:
Note:
Truth tables
RE
X
X
L
H
Inputs
DE
H
H
L
L
X= do not care; Z= high impedance
L
X
X
DI
H
Table 2. Truth table (driver)
Outputs
H
Z
Z
B
L
L
Z
Z
A
H
Inputs
RE
L
L
L
L
H
DE
L
L
L
L
L
X= do not care; Z= high impedance
A-B
≥+0.2V
≤-0.2V
Inputs open
Inputs shorted
X
Output
RO
H
H
H
L
Z
Mode
Normal
Normal
Normal
Shutdown
Mode
Normal
Normal
Normal
Normal
Shutdown
DS13697 - Rev 1 page 3/21
3
Note:
ST1480US
Maximum ratings
Maximum ratings
Symbol
V
CC
V
I
V
DI
V
DO
V
RI
V
RO
ESD
Supply voltage
Control input voltage (RE, DE)
Driver input voltage (DI)
Driver output voltage (A, B)
Receiver input voltage (A, B)
Receiver output voltage (RO)
Table 3. Absolute maximum ratings
Parameter
ESD protection voltage
Human body model
IEC-1000-4-2 contact discharge
Value
7
-0.3 to 7
-0.3 to 7
± 14
± 14
-0.3 to (V
CC
+ 0.3)
±15
±8
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied.
V
V
V
Unit
V
V
V kV
DS13697 - Rev 1 page 4/21
4
ST1480US
Electrical characteristics
Electrical characteristics
V
CC
= 3 V to 3.6 V, T
A
= -40 to 85 °C, unless otherwise specified. Typical values are referred to T
A
= 25 °C).
Symbol Parameter
I
SUPPLY
V
CC
power supply current
I
SHDN
Shutdown supply current
Table 4. Electrical characteristics
Test conditions
No Load,
DI = 0 V or V
CC
DE = V
CC
, RE = 0 V or V
DE=0 V, RE=0 V
DE = 0 V, RE = V
CC
, DI = 0 V or V
CC
CC
Min.
Typ.
Max.
Unit
1.3
2.2
mA
1.2
0.002
1.9
1 mA
µA
Symbol
V
IL
V
IH
I
IN1
I
IN2
Parameter
Input logic threshold low
Input logic threshold high
Logic input current
Table 5. Logic input electrical characteristics
Test conditions
DE, DI, RE
DE, DI, RE
DE, DI, RE
Input current (A, B) DE=0 V, V
CC
=0 or 3.6 V
VIN = 12 V
VIN = -7 V
Min.
Typ.
Max.
Unit
0.8
V
2
±2.0
1
-0.8
V
µA mA mA
Table 6. Transmitter electrical characteristics
Symbol
V
OD
Parameter
Differential drive output
Test conditions
R
L
= 100 Ω (RS-422) ( Figure 1. Pin connections
)
Min. Typ. Max. Unit
2
R
L
= 54 Ω (RS-485) (
) 1.5
R
L
= 60 Ω (RS-485) (
1.5
V
V
V
ΔV
OD
Change in magnitude of driver differential output voltage for complementary output states
R
L
= 54 Ω or 100 Ω ( Figure 1. Pin connections )
V
ΔV
OC
OC
Driver common mode output voltage
Change in magnitude of driver common mode output voltage
R
R
L
L
I
OSD
Driver short-circuit output current
1. ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.
0.2
3
0.2
V
V
V
±250 mA
DS13697 - Rev 1 page 5/21
DS13697 - Rev 1
ST1480US
Electrical characteristics
Table 7. Receiver electrical characteristics
Symbol
V
ΔV
TH
TH
Parameter
Receiver differential threshold voltage
Receiver input hysteresis
I
I
V
V
OZR
R
OH
OL
RIN
OSR
V
CM
Test conditions
=-7 V to 12 V, DE = 0
Receiver output high voltage
Receiver output low voltage
V
CM
=0 V
I
OUT
= -4 mA, V
ID
= 200 mV, ( Figure 8. Drive enable and disable times waveforms
)
I
OUT
= 4 mA, V
ID
= -200 mV, (
Figure 3. Driver V varying common mode voltage test load
)
3-state (high impedance) output current at receiver
V
CC
= 3.6 V, V
O
= 0 V to V
Receiver input resistance V
CM
= -7 V to 12 V
Receiver short-circuit current V
RO
= 0 V to V
CC
CC
Min. Typ. Max. Unit
-0.2
30
-0.015
V
µV
2
24
7
0.4
V
V
±1 µA kΩ
60 mA
Table 8. Driver switching characteristics
Symbol
D
R
Parameter
Maximum data rate
Test conditions t t t t t t t t t
DD
TD
PLH
PHL
PDS
PZL
PZH
PHZ
PLZ
Differential output delay
Differential output transition time
Propagation delay
|t
PLH
- t
PHL delay skew
|propagation
Output enable time
Output enable time
Output disable time
Output disable time
R
L
= 60 Ω, C
L
= 15 pF, ( Figure 4. Receiver V
and Figure 5. Drive differential output delay transition time test circuit
)
R
L
= 60 Ω, C
L
= 15 pF, ( Figure 4. Receiver V
Figure 5. Drive differential output delay transition time test circuit
)
R
L
= 27 Ω, C
L
R
L
= 27 Ω, C
L
R
L
= 110 Ω, (
Figure 10. Drive propagation time waveform
and
Figure 11. Drive enable and disable times test circuit (R
R
L
= 110 Ω, (
Figure 10. Drive propagation time waveform
and
Figure 11. Drive enable and disable times test circuit (R
R
L
= 110 , (
)
R
L
= 110 Ω (
Figure 10. Drive propagation time waveform and
Figure 11. Drive enable and disable times test circuit (R
t
SKEW
Differential output delay skew t
ZH(SHDN)
Driver enable from shutdown to output high t
ZL(SHDN)
Driver enable from shutdown to output low
1. Measured on |t
PLH
(A)-t
PHL
(A)| and |t
PLH
(B)-t
PHL
(B)|
Min. Typ. Max. Unit
12 15 Mbps
18
12
18
2
19
30
19
30
1
30
19
30
20
30
5
35
50
35
50
3
50
35 ns ns ns ns ns ns ns ns ns ns ns page 6/21
DS13697 - Rev 1
ST1480US
Electrical characteristics
Symbol t
PLH t
PHL
Parameter
Propagation delay t
RPDS
|tPLH - tPHL| propagation delay skew t
PZL t
PZH t
PHZ t
PLZ
Outputenable time
Outputenable time
Outputdisable time
Outputdisable time t
ZH(SHDN)
Receiver enable from shutdown to output high t
ZL(SHDN)
Receiver enable from shutdown to output low
Table 9. Receiver switching characteristics
Test conditions
V
ID
= 0 V to 3 V, C
L1
=15 pF (
)
V
ID
= 0 V to 3 V, C
L1
=15 pF (
)
C
RL
= 15 pF, ( Figure 14. Receiver propagation delay time waveforms
and
Figure 18. Receiver enable and disable times waveform (S2 closed)
)
C
RL
= 15 pF, ( Figure 14. Receiver propagation delay time waveforms
and
Figure 18. Receiver enable and disable times waveform (S2 closed)
)
C
RL
= 15 pF, ( Figure 14. Receiver propagation delay time waveforms
and
Figure 18. Receiver enable and disable times waveform (S2 closed)
)
C
RL
= 15 pF, ( Figure 14. Receiver propagation delay time waveforms
and
Figure 18. Receiver enable and disable times waveform (S2 closed)
)
C
RL
= 15 pF, ( Figure 14. Receiver propagation delay time waveforms
and
Figure 18. Receiver enable and disable times waveform (S2 closed)
)
C
RL
= 15 pF, ( Figure 14. Receiver propagation delay time waveforms
and
Figure 18. Receiver enable and disable times waveform (S2 closed)
)
Min. Typ. Max. Unit
30
1
10
10
10
10
10
20
50
3
20
20
20
20
20
40 ns ns ns ns ns ns ns
µs page 7/21
5
Test circuits and typical characteristics
Figure 2. Driver and V
OC test load
ST1480US
Test circuits and typical characteristics
Figure 3. Driver V
OD
with varying common mode voltage test load
Figure 4. Receiver V
OH
and V
OL
test circuit
DS13697 - Rev 1 page 8/21
DS13697 - Rev 1
ST1480US
Test circuits and typical characteristics
Figure 5. Drive differential output delay transition time test circuit
Figure 6. Drive differential output delay transition time waveform
Figure 7. Drive enable and disable times test circuit page 9/21
DS13697 - Rev 1
ST1480US
Test circuits and typical characteristics
Figure 8. Drive enable and disable times waveforms
Figure 9. Drive propagation time test circuit
Figure 10. Drive propagation time waveform page 10/21
DS13697 - Rev 1
ST1480US
Test circuits and typical characteristics
Figure 11. Drive enable and disable times test circuit (R
L
= 110 Ω)
Figure 12. Drive enable and disable times waveforms (B)
Figure 13. Receiver propagation delay time test circuit page 11/21
DS13697 - Rev 1
ST1480US
Test circuits and typical characteristics
Figure 14. Receiver propagation delay time waveforms
Figure 15. Receiver enable and disable times test circuit (B)
Figure 16. Receiver enable and disable times waveform (S1 open) page 12/21
DS13697 - Rev 1
ST1480US
Test circuits and typical characteristics
Figure 17. Receiver enable and disable times waveform (S1 closed)
Figure 18. Receiver enable and disable times waveform (S2 closed)
Figure 19. Receiver enable and disable times waveform (S2 open) page 13/21
ST1480US
Test circuits and typical characteristics
Figure 20. Receiver output current vs. output low voltage
Figure 21. Receiver output current vs. output high voltage
Figure 22. Low level driver output capability
Figure 23. High level driver output capability
DS13697 - Rev 1 page 14/21
Figure 24. Receiver input characteristics
ST1480US
Test circuits and typical characteristics
Figure 25. Driver short-circuit current
Figure 26. Driver short-circuit current
DS13697 - Rev 1 page 15/21
6
6.1
ST1480US
Package information
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.
SO8 package information
Figure 27. SO8 package outline
DS13697 - Rev 1
Dim.
L
L1 k ccc
E1 e h
A
A1
A2 b c
D
E
0.1
1.25
0.28
0.17
4.8
5.8
3.8
Min.
0.25
0.4
0 mm
4.9
6
3.9
1.27
Typ.
Table 10. SO-8 mechanical data
Inches
Min.
Max.
1.75
0.25
0.48
0.23
5
6.2
4
0.004
0.049
0.011
0.007
0.189
0.228
0.15
0.5
1.27
0.01
0.016
1.04
8 °
0.1
1 °
Typ.
0.193
0.236
0.154
0.05
0.04
Max.
0.069
0.01
0.019
0.01
0.197
0.244
0.157
0.02
0.05
8 °
0.004
page 16/21
7
ST1480US
Ordering information
Ordering information
Order codes
ST1480ACDR/US
Table 11. Ordering information
Temperature range
0 to 70 °C
Package
SO-8 tape and reel
Packing
2500 parts per reel
DS13697 - Rev 1 page 17/21
Revision history
Date
06-Apr-2021
Version
1
Table 12. Document revision history
Changes
Initial release.
ST1480US
DS13697 - Rev 1 page 18/21
ST1480US
Contents
Contents
DS13697 - Rev 1 page 19/21
ST1480US
List of tables
List of tables
DS13697 - Rev 1 page 20/21
ST1480US
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2021 STMicroelectronics – All rights reserved
DS13697 - Rev 1 page 21/21
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