Fiche technique pour ST1480AB,AC de STMicroelectronics

This is information on a product in full production.
March 2020 DocID9101 Rev 5 1/19
ST1480AB
ST1480AC
3.3 V powered, 15 kV ESD protected,
up to 12 Mbps true RS-485/RS-422 transceiver
Datasheet
-
production data
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 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.
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 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.
62
Table 1. Device summary
Order codes Temperature range Package Packaging
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
www.st.com
Contents ST1480AB - ST1480AC
2/19 DocID9101 Rev 5
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
csoasm 18 Vcc 17 B 16A ]5 GND
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ST1480AB - ST1480AC Pin configuration
19
1 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 Ground
6 A Non-inverting receiver input and non-inverting driver output
7 B Inverting receiver input and inverting driver output
8 V
CC
Supply voltage: V
CC
= 3 V to 3.6 V
Truth tables ST1480AB - ST1480AC
4/19 DocID9101 Rev 5
2 Truth tables
Note: X= Don’t care; Z=High impedance
Note: X= Don’t care; Z=High impedance
Table 2. Truth table (driver)
Inputs Outputs
Mode
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
Table 3. Truth table (receiver)
Inputs Output
Mode
RE DE A-B RO
L L
≥
+0.2 V H Normal
L L
≤
-0.2 V L Normal
L L Inputs open H Normal
L L Inputs shorted H Normal
H L X Z Shutdown
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ST1480AB - ST1480AC Maximum ratings
19
3 Maximum ratings
Note: 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
V
CC
Supply voltage 7 V
V
I
Control input voltage (RE, DE) -0.3 to 7 V
V
DI
Driver input voltage (DI) -0.3 to 7 V
V
DO
Driver output voltage (A, B) ± 14 V
V
RI
Receiver input voltage (A, B) ± 14 V
V
RO
Receiver output voltage (RO) -0.3 to (V
CC
+ 0.3) V
ESD ESD protection voltage Human body model ± 15 kV
IEC-1000-4-2 contact discharge ± 8
Electrical characteristics ST1480AB - ST1480AC
6/19 DocID9101 Rev 5
4 Electrical characteristics
V
CC
= 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred
to TA = 25 °C).
Table 5. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
SUPPLY
V
CC
Power supply current No Load, DI=0 V or
V
CC
DE=V
CC
,
RE=0 V or
V
CC
1.3 2.2 mA
DE=0 V,
RE=0 V 1.2 1.9 mA
I
SHDN
Shutdown supply current DE=0 V, RE=V
CC
, DI=0 V or V
CC
0.002 1 µA
Table 6. Logic input electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
IL
Input logic threshold low DE, DI, RE 0.8 V
V
IH
Input logic threshold high DE, DI, RE 2 V
I
IN1
Logic input current DE, DI, RE ± 2.0 µA
I
IN2
Input current (A, B) DE=0V, V
CC
= 0 or 3.6V V
IN
=12 V 1 mA
V
IN
=-7 V -0.8 mA
Table 7. Transmitter electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
OD
Differential drive output
R
L
= 100 Ω (RS-422) (Figure 1) 2 V
R
L
= 54 Ω (RS-485) (Figure 1) 1.5 V
R
L
= 60 Ω (RS-485) (Figure 3) 1.5 V
∆V
OD
Change in magnitude of driver
differential output voltage for
complementary output states
(Note: 1)
R
L
= 54 Ω or 100 Ω (Figure 1) 0.2 V
V
OC
Driver common mode output
voltage R
L
= 54 Ω or 100 Ω (Figure 1) 3 V
∆V
OC
Change in magnitude of driver
common mode output voltage
(Note: 1)
R
L
= 54 Ω or 100 Ω (Figure 1) 0.2 V
I
OSD
Driver short circuit output
current ± 250 mA
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ST1480AB - ST1480AC Electrical characteristics
19
Table 8. Receiver electrical characteristics
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
TH
Receiver differential
threshold voltage V
CM
= -7 V to 12 V, DE = 0 -0.2 -0.015 V
∆V
TH
Receiver input hysteresis V
CM
= 0 V 30 µV
V
OH
Receiver output high
voltage I
OUT
= -4 mA, V
ID
= 200 mV, (Figure 9) 2 V
V
OL
Receiver output low
voltage I
OUT
= 4 mA, V
ID
= -200 mV, (Figure 4) 0.4 V
I
OZR
3-state (high impedance)
output current at receiver V
CC
= 3.6 V, V
O
= 0 V to V
CC
± 1 µA
R
RIN
Receiver input resistance V
CM
= -7 V to 12 V 24 kΩ
I
OSR
Receiver short-circuit
current V
RO
= 0 V to V
CC
7 60 mA
Table 9. Driver switching characteristics
Symbol Parameter Test Conditions Min. Typ. Max. Unit
D
R
Maximum data rate 12 15 Mbps
t
DD
Differential output delay R
L
= 60 Ω, C
L
= 15 pF, (Figure 5 and
Figure 6)18 30 ns
t
TD
Differential output
transition time
R
L
= 60 Ω, C
L
= 15 pF, (Figure 5 and
Figure 6)12 20 ns
t
PLH
t
PHL
Propagation delay R
L
= 27 Ω, C
L
= 15 pF, (Figure 9 and
Figure 10)18 30 ns
t
PDS
|t
PLH -
t
PHL
| propagation
delay skew (Note 2)
R
L
= 27 Ω, C
L
= 15 pF, (Figure 9 and
Figure 10)2 5 ns
t
PZL
Output enable time R
L
= 110 Ω, (Figure 11 and Figure 12) 19 35 ns
t
PZH
Output enable time R
L
= 110 Ω, (Figure 7 and Figure 8) 30 50 ns
t
PHZ
Output disable time R
L
= 110 Ω, (Figure 7 and Figure 8) 19 35 ns
t
PLZ
Output disable time R
L
= 110 Ω, (Figure 11 and Figure 12) 30 50 ns
t
SKEW
Differential output delay
skew 1 3 ns
t
ZH(SHDN)
Driver enable from
shutdown to output high 30 50 ns
t
ZL(SHDN)
Driver enable from
shutdown to output low 19 35 ns
Electrical characteristics ST1480AB - ST1480AC
8/19 DocID9101 Rev 5
Note: 1
∆
V
OD
and
∆
V
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes
state.
2 Measured on |t
PLH
(A)-t
PHL
(A)| and |t
PLH
(B)-t
PHL
(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.
Table 10. Receiver switching characteristics
Symbol Parameter Test Conditions Min. Typ. Max. Unit
t
PLH
t
PHL
Propagation delay V
ID
= 0 V to 3 V, C
L1
=15 pF
(Figure 13 and Figure 14)30 50 ns
t
RPDS
|t
PLH -
t
PHL
| propagation
delay skew
V
ID
= 0 V to 3 V, C
L1
= 15 pF
(Figure 13 and Figure 14)1 3 ns
t
PZL
Output enable time C
RL
= 15 pF, (Figure 15 and Figure 19) 10 20 ns
t
PZH
Output enable time C
RL
= 15 pF, (Figure 15 and Figure 19) 10 20 ns
t
PHZ
Output disable time C
RL
= 15 pF, (Figure 15 and Figure 19) 10 20 ns
t
PLZ
Output disable time C
RL
= 15 pF, (Figure 15 and Figure 19) 10 20 ns
t
ZH(SHDN)
Receiver enable from
shutdown to output high C
RL
= 15 pF, (Figure 15 and Figure 19) 10 20 ns
t
ZL(SHDN)
Receiver enable from
shutdown to output low C
RL
= 15 pF, (Figure 15 and Figure 19) 20 40 µs
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DocID9101 Rev 5 9/19
ST1480AB - ST1480AC Test circuits and typical characteristics
19
5 Test circuits and typical characteristics
Figure 3. Driver and V
OC
test load
Figure 4. Driver V
OD
with varying common mode voltage test load
Figure 5. Receiver V
OH
and V
OL
test circuit
Input R :soo (NOTE 4) L + + CL — — CL=15pF Vcc I IWOTE 5) m cswszo 0V OR 3V (NOTE 4) 95‘ m:
Test circuits and typical characteristics ST1480AB - ST1480AC
10/19 DocID9101 Rev 5
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
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DocID9101 Rev 5 11/19
ST1480AB - ST1480AC Test circuits and typical characteristics
19
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
12/19 DocID9101 Rev 5
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
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DocID9101 Rev 5 13/19
ST1480AB - ST1480AC Test circuits and typical characteristics
19
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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Test circuits and typical characteristics ST1480AB - ST1480AC
14/19 DocID9101 Rev 5
Figure 18. Receiver enable and disable times waveform
Figure 19. Receiver enable and disable times waveform
Figure 20. Receiver enable and disable times waveform
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DocID9101 Rev 5 15/19
ST1480AB - ST1480AC Test circuits and typical characteristics
19
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
csmm
Test circuits and typical characteristics ST1480AB - ST1480AC
16/19 DocID9101 Rev 5
Figure 27. Driver short circuit current
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DocID9101 Rev 5 17/19
ST1480AB - ST1480AC Package mechanical data
19
6 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.
Figure 28. Drawing dimension SO-8
Table 11. SO-8 mechanical data
Dim.
mm
Min. Typ. Max.
A 1.75
A1 0.10 0.25
A2 1.25
b 0.28 0.48
c 0.17 0.23
D 4.80 4.90 5.00
E 5.80 6.00 6.20
E1 3.80 3.90 4.00
e 1.27
h 0.25 0.50
L 0.40 1.27
L1 1.04
k 0° 8°
ccc 0.10
Revision history ST1480AB - ST1480AC
18/19 DocID9101 Rev 5
7 Revision history
Table 12. Document revision history
Date Revision Changes
02-May-2006 2 Order codes updated.
19-Nov-2007 3 Added Table 2.
24-Jul-2013 4
Updated:
ECOPACK
section in Chapter 6.
Corrected: unit of measurement in Table 9 (Receiver input hysteresis
from V to µV). Minor text changes.
18-Mar-2020 5 Updated Table 1, Table 3 and V
IL
parameter in Table 6.
Removed DIP-8 package.
DocID9101 Rev 5 19/19
ST1480AB - ST1480AC
19
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