ST1480AB
ST1480AC
3.3 V powered, 15 kV ESD protected,
up to 12 Mbps true RS-485/RS-422 transceiver
Datasheet - production data
Description
The ST1480Ax 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 ST1480Ax transmits and receives at a
guaranteed data rate of at least 12 Mbps.
DIP-8
All transmitter outputs and receiver inputs are
protected to ±15 kV using Human Body Model.
SO-8
Driver is short-circuit current limited and is
protected against excessive power dissipation by
Features
thermal shutdown circuitry that places the driver
outputs into a high-impedance state.
• ESD protection
– ±15 kV human body model
– ±8 kV IEC 1000-4-2 contact discharge
The ST1480Ax 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.
• 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
Table 1. Device summary
Order codes
Temperature range
Package
Packaging
ST1480ACN
0 to 70 °C
DIP-8
50 parts per tube / 40 tube per box
ST1480ACDR
0 to 70 °C
SO-8 (tape & reel)
2500 parts per reel
ST1480ABDR
-40 to 85 °C
SO-8 (tape & reel)
2500 parts per reel
July 2013
This is information on a product in full production.
DocID9101 Rev 4
1/21
www.st.com
Contents
ST1480AB - ST1480AC
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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ST1480AB - ST1480AC
1
Pin configuration
Pin configuration
Figure 1. Pin connections
Figure 2. Pin description
Pin n°
Symbol
Name and function
1
RO
Receiver output. If A>B by 200 mV, RO is high; if A< B by 200 mV, RO is 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 enters 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 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.
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
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Truth tables
2
ST1480AB - ST1480AC
Truth tables
Table 2. Truth table (driver)
Inputs
Outputs
Mode
Note:
RE
DE
DI
B
A
X
H
H
L
H
Normal
X
H
L
H
L
Normal
L
L
X
Z
Z
Normal
H
L
X
Z
Z
Shutdown
X= Don’t care; Z=High impedance
Table 3. Truth table (receiver)
Inputs
Output
Mode
RE
DE
L
L
L
L
L
L
L
H
Note:
4/21
A-B
RO
-0.015 V
H
Normal
-0.2 V
L
Normal
Inputs open
H
Normal
L
Inputs shorted
H
Normal
L
X
Z
Shutdown
≥
≤
X= Don’t care; Z=High impedance
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ST1480AB - ST1480AC
3
Maximum ratings
Maximum ratings
Table 4. Absolute maximum ratings
Symbol
VCC
Parameter
Supply voltage
Value
Unit
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
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 5. ESD performance: transmitter outputs, receiver inputs
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
ESD
ESD protection voltage
Human body model
± 15
kV
ESD
ESD protection voltage
IEC-1000-4-2 contact discharge
±8
kV
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Electrical characteristics
4
ST1480AB - ST1480AC
Electrical characteristics
VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred
to TA = 25 °C).
Table 6. Electrical characteristics
Symbol
ISUPPLY
ISHDN
Parameter
Test conditions
No Load, DI=0 V or
VCC Power supply current
VCC
Shutdown supply current
Min.
Typ.
Max.
Unit
DE=VCC,
RE=0 V or
VCC
1.3
2.2
mA
DE=0 V,
RE=0 V
1.2
1.9
mA
0.002
1
µA
Typ.
Max.
Unit
1.3
0.8
V
DE=0 V, RE=VCC, DI=0 V or VCC
Table 7. Logic input electrical characteristics
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=0V, VCC= 0 or 3.6V
Min.
2
V
± 2.0
µA
VIN=12 V
1
mA
VIN=-7 V
-0.8
mA
Max.
Unit
Table 8. Transmitter electrical characteristics
Symbol
VOD
ΔVOD
VOC
Parameter
Differential drive output
Test conditions
2
V
RL= 54 Ω (RS-485) (Figure 1)
1.5
V
RL= 60 Ω (RS-485) (Figure 3)
1.5
V
RL= 54 Ω or 100 Ω (Figure 1)
ΔVOC
Change in magnitude of driver
common mode output voltage RL= 54 Ω or 100 Ω (Figure 1)
(Note: 1)
IOSD
Driver short circuit output
current
6/21
Typ.
RL= 100 Ω (RS-422) (Figure 1)
Change in magnitude of driver
differential output voltage for
RL= 54 Ω or 100 Ω (Figure 1)
complementary output states
(Note: 1)
Driver common mode output
voltage
Min.
DocID9101 Rev 4
0.2
V
3
V
0.2
V
± 250
mA
ST1480AB - ST1480AC
Electrical characteristics
Table 9. Receiver electrical characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
-0.015
V
Receiver differential
threshold voltage
VCM = -7 V to 12 V, DE = 0
ΔVTH
Receiver input hysteresis
VCM = 0 V
VOH
Receiver output high
voltage
IOUT = -4 mA, VID = 200 mV, (Figure 9)
VOL
Receiver output low
voltage
IOUT = 4 mA, VID = -200 mV, (Figure 4)
0.4
V
IOZR
3-state (high impedance)
output current at receiver
VCC = 3.6 V, VO = 0 V to VCC
±1
µA
RRIN
Receiver input resistance
VCM = -7 V to 12 V
24
IOSR
Receiver short-circuit
current
VRO = 0 V to VCC
7
VTH
-0.2
30
µV
2
V
kΩ
60
mA
Max.
Unit
Table 10. Driver switching characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
12
15
DR
Maximum data rate
tDD
Differential output delay
RL= 60 Ω, CL = 15 pF, (Figure 5 and
Figure 6)
18
30
ns
tTD
Differential output
transition time
RL= 60 Ω, CL = 15 pF, (Figure 5 and
Figure 6)
12
20
ns
tPLH
tPHL
Propagation delay
RL= 27 Ω, CL = 15 pF, (Figure 9 and
Figure 10)
18
30
ns
tPDS
|tPLH - tPHL| propagation
delay skew (Note 2)
RL= 27 Ω, CL = 15 pF, (Figure 9 and
Figure 10)
2
5
ns
tPZL
Output enable time
RL= 110 Ω, (Figure 11 and Figure 12)
19
35
ns
tPZH
Output enable time
RL= 110 Ω, (Figure 7 and Figure 8)
30
50
ns
tPHZ
Output disable time
RL= 110 Ω, (Figure 7 and Figure 8)
19
35
ns
tPLZ
Output disable time
RL= 110 Ω, (Figure 11 and Figure 12)
30
50
ns
Mbps
tSKEW
Differential output delay
skew
1
3
ns
tZH(SHDN)
Driver enable from
shutdown to output high
30
50
ns
tZL(SHDN)
Driver enable from
shutdown to output low
19
35
ns
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21
Electrical characteristics
ST1480AB - ST1480AC
Table 11. Receiver switching characteristics
Symbol
tPLH
tPHL
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Propagation delay
VID= 0 V to 3 V, CL1 =15 pF
(Figure 13 and Figure 14)
30
50
ns
|tPLH - tPHL| propagation
delay skew
VID= 0 V to 3 V, CL1 = 15 pF
(Figure 13 and Figure 14)
1
3
ns
tPZL
Output enable time
CRL = 15 pF, (Figure 15 and Figure 19)
10
20
ns
tPZH
Output enable time
CRL = 15 pF, (Figure 15 and Figure 19)
10
20
ns
tPHZ
Output disable time
CRL = 15 pF, (Figure 15 and Figure 19)
10
20
ns
tPLZ
Output disable time
CRL = 15 pF, (Figure 15 and Figure 19)
10
20
ns
tZH(SHDN)
Receiver enable from
shutdown to output high
CRL = 15 pF, (Figure 15 and Figure 19)
10
20
ns
tZL(SHDN)
Receiver enable from
shutdown to output low
CRL = 15 pF, (Figure 15 and Figure 19)
20
40
µs
tRPDS
Note:
8/21
1
ΔVOD and ΔVOC 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.
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5
Test circuits and typical characteristics
Test circuits and typical characteristics
Figure 3. Driver and VOC test load
Figure 4. Driver VOD with varying common mode voltage test load
Figure 5. Receiver VOH and VOL test circuit
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Test circuits and typical characteristics
ST1480AB - ST1480AC
Figure 6. Drive differential output delay transition time test circuit
Figure 7. Drive differential output delay transition time waveform
Figure 8. Drive enable and disable times test circuit
10/21
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Test circuits and typical characteristics
Figure 9. Drive enable and disable times waveforms
Figure 10. Drive propagation time test circuit
Figure 11. Drive propagation time waveform
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Test circuits and typical characteristics
ST1480AB - ST1480AC
Figure 12. Drive enable and disable times test circuit
Figure 13. Drive enable and disable times waveforms
Figure 14. Receiver propagation delay time test circuit
12/21
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ST1480AB - ST1480AC
Test circuits and typical characteristics
Figure 15. Receiver propagation delay time waveforms
Figure 16. Receiver enable and disable times test circuit
Figure 17. Receiver enable and disable times waveform
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21
Test circuits and typical characteristics
ST1480AB - ST1480AC
Figure 18. Receiver enable and disable times waveform
Figure 19. Receiver enable and disable times waveform
Figure 20. Receiver enable and disable times waveform
14/21
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Test circuits and typical characteristics
Figure 21. Receiver output current vs output
low voltage
Figure 22. Receiver output current vs output
high voltage
Figure 23. Low level driver output capability
Figure 24. High level driver output capability
Figure 25. Receiver input characteristics
Figure 26. Driver short circuit current
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21
Test circuits and typical characteristics
ST1480AB - ST1480AC
Figure 27. Driver short circuit current
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6
Package mechanical data
Package mechanical data
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.
Plastic DIP-8 mechanical data
mm.
inch.
Dim.
Min.
A
Typ.
Max.
Min.
3.3
a1
0.7
B
1.39
1.65
0.055
B1
0.91
1.04
0.036
b
b1
Typ.
0.028
0.5
0.38
0.065
0.041
0.020
0.5
D
0.015
0.020
9.8
E
0.386
8.8
0.346
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
7.1
I
4.8
L
Z
0.280
0.189
3.3
0.44
Max.
0.130
0.130
1.6
0.017
0.063
P001F
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Package mechanical data
ST1480AB - ST1480AC
SO-8 mechanical data
Dim.
mm.
Min.
Typ.
inch.
Max.
Min.
Typ.
Max.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.04
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
ddd
8° (max.)
0.1
0.04
0016023/C
18/21
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ST1480AB - ST1480AC
Package mechanical data
Tape & reel SO-8 mechanical data
mm.
inch.
Dim.
Min.
A
Typ.
Max.
Min.
330
Max.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Typ.
0.504
22.4
0.519
0.882
Ao
8.1
8.5
0.319
0.335
Bo
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
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Revision history
7
ST1480AB - ST1480AC
Revision history
Table 12. Document revision history
Date
Revision
02-May-2006
2
Order codes updated.
19-Nov-2007
3
Added Table 2.
4
Updated: ECOPACK® section in Chapter 6 .
Corrected: unit of measurement in Table 9 (Receiver input hysteresis
from V to µV).Minor text changes.
24-Jul-2013
20/21
Changes
DocID9101 Rev 4
ST1480AB - ST1480AC
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