– ±15 kV human body model
– ±8 kV IEC 1000-4-2 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 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
■ Allow up to 64 transceivers on the bus
ST1480AB
ST1480AC
DIP-8
thermal shutdown circuitry that places the driver
outputs into a high-impedance state.
The ST1480A 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.
SO-8
Description
The ST1480A 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 ST1480A 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
Figure 1.Device summary
Part numberTemperature rangePackagePackaging
ST1480ACN0 to 70 °CDIP-850 parts per tube / 40 tube per box
ST1480ACDR0 to 70 °CSO-8 (tape & reel)2500 parts per reel
ST1480ABDR-40 to 85 °CSO-8 (tape & reel)2500 parts per reel
1ROReceiver output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be low
2RE
3DE
4DI
5GNDGround
6ANon-inverting receiver input and non-inverting driver output
7BInverting receiver input and inverting driver output
8V
CC
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.
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.
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
Supply voltage: VCC= 3V to 3.6V
3/22
Truth tablesST1480AB - ST1480AC
2 Truth tables
Table 2.Truth table (driver)
InputsOutputs
Mode
RE
XHHLHNormal
XHLHLNormal
LLXZZNormal
HLXZZShutdown
Note:X= Don’t care; Z=High impedance
Table 3.Truth table (receiver)
REDEA-BRO
DEDIBA
InputsOutput
Mode
LL
LL
LLInputs openHNormal
LLInputs shortedHNormal
HLXZShutdown
≥ -0.015VHNormal
≤ -0.2VLNormal
Note:X= Don’t care; Z=High impedance
4/22
ST1480AB - ST1480ACMaximum ratings
3 Maximum ratings
Table 4.Absolute maximum ratings
SymbolParameterValueUnit
V
CC
V
I
V
DI
V
DO
V
RI
V
RO
Supply voltage7V
Control input voltage (RE, DE)-0.3 to 7V
Driver input voltage (DI)-0.3 to 7V
Driver output voltage (A, B)± 14V
Receiver input voltage (A, B)± 14V
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.
= 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred
V
CC
to T
= 25 °C)
A
SymbolParameterTest conditionsMin.Typ.Max.Unit
I
SUPPLYVCC
I
SHDN
Shutdown supply currentDE=0V, RE=VCC, DI=0V or VCC 0.0021µA
Power supply current No Load, DI=0V or V
DE=VCC,
RE=0V or V
CC
DE=0V,
RE
CC
=0V
1.32.2mA
1.21.9mA
Table 7.Logic input electrical characteristics
V
= 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred
CC
to T
= 25 °C)
A
SymbolParameterTest conditionsMin.Typ.Max.Unit
Input logic threshold lowDE, DI, RE1.30.8V
IL
Input logic threshold highDE, DI, RE2V
IH
Logic input currentDE, DI, RE± 2.0µA
V
=12V1mA
Input current (A, B)DE=0V, VCC= 0 or 3.6V
IN
V
=-7V-0.8mA
IN
V
I
I
V
IN1
IN2
Table 8.Transmitter electrical characteristics
V
= 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred
CC
to T
= 25 °C)
A
SymbolParameterTest conditionsMin.Typ.Max.Unit
R
= 100Ω (RS-422) (Figure 2)2V
L
V
Differential drive output
OD
= 54Ω (RS-485) (Figure 2)1.5V
R
L
R
= 60Ω (RS-485) (Figure 3)1.5V
L
Change in magnitude of driver
ΔV
differential output voltage for
OD
complementary output states
= 54Ω or 100Ω (Figure 2)0.2V
R
L
(Note: 1)
V
Driver common mode output
OC
voltage
= 54Ω or 100Ω (Figure 2)3V
R
L
Change in magnitude of driver
ΔV
common mode output voltage
OC
= 54Ω or 100Ω (Figure 2)0.2V
R
L
(Note: 1)
I
OSD
Driver short circuit output
current
6/22
± 250mA
ST1480AB - ST1480ACElectrical characteristics
Table 9.Receiver electrical characteristics
V
= 3V to 3.6V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred
CC
to T
= 25°C)
a
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
ΔV
V
V
I
OZR
R
I
OSR
Receiver differential
TH
threshold voltage
Receiver input hysteresisVCM = 0V30V
TH
Receiver output high
OH
voltage
Receiver output low
OL
voltage
3-State (high impedance)
output current at receiver
Receiver input resistanceVCM = -7V to 12V24kΩ
RIN
Receiver short-circuit
current
V
= -7V to 12V, DE = 0-0.2-0.015V
CM
I
= -4mA, VID = 200mV, (Figure 9)2V
OUT
= 4mA, VID = -200mV, (Figure 4)0.4V
I
OUT
= 3.6V, VO = 0V to V
V
CC
= 0V to V
V
RO
CC
CC
760mA
± 1µA
Table 10.Driver switching characteristics
V
= 3V to 3.6V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred
CC
to T
= 25°C)
a
SymbolParameterTest ConditionsMin.Typ.Max.Unit
D
t
DD
t
TD
Maximum data rate1215Mbps
R
= 60Ω, CL = 15pF, (Figure 5 and
R
Differential output delay
Differential output
transition time
L
Figure 6)
RL= 60Ω, CL = 15pF, (Figure 5 and
Figure 6)
1830ns
1220ns
t
PLH
t
PHL
t
PDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
SKEW
t
ZH(SHDN)
t
ZL(SHDN)
R
= 27Ω, CL = 15pF, (Figure 9 and
Propagation delay
|t
PLH - tPHL
| propagation
delay skew (Note 2)
L
Figure 10)
RL= 27Ω, CL = 15pF, (Figure 9 and
Figure 10)
1830ns
25ns
Output enable timeRL= 110Ω, (Figure 11 and Figure 12)1935ns
Output enable timeRL= 110Ω, (Figure 7 and Figure 8)3050ns
Output disable timeRL= 110Ω, (Figure 7 and Figure 8)1935ns
Output disable timeRL= 110Ω, (Figure 11 and Figure 12)3050ns
Differential output delay
skew
Driver enable from
shutdown to output high
Driver enable from
shutdown to output low
13ns
3050ns
1935ns
7/22
Electrical characteristicsST1480AB - ST1480AC
Table 11.Receiver switching characteristics
V
= 3V to 3.6V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred
CC
to T
= 25°C)
a
SymbolParameterTest ConditionsMin.Typ.Max.Unit
t
PLH
t
PHL
t
RPDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
ZH(SHDN)
t
ZL(SHDN)
Propagation delay
|t
PLH - tPHL
| propagation
delay skew
Output enable timeCRL = 15pF, (Figure 15 and Figure 19)1020ns
Output enable timeCRL = 15pF, (Figure 15 and Figure 19)1020ns
Output disable timeCRL = 15pF, (Figure 15 and Figure 19)1020ns
Output disable timeCRL = 15pF, (Figure 15 and Figure 19)1020ns
Receiver enable from
shutdown to output high
Receiver enable from
shutdown to output low
= 0V to 3V, CL1 =15pF
V
ID
(Figure 13 and Figure 14)
VID= 0V to 3V, CL1 = 15pF
(Figure 13 and Figure 14)
= 15pF, (Figure 15 and Figure 19)1020ns
C
RL
= 15pF, (Figure 15 and Figure 19)2040µs
C
RL
3050ns
13ns
Note:1 ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes
state.
2Measured on |t
PLH
(A)-t
(A)| and |t
PHL
PLH
(B)-t
PHL
(B)|
3The transceivers are put into shutdown by bring RE high and DE low. If the input are in state
for less than 80ns, the part are guaranteed not to enter shutdown. If the inputs are in this
state for at least 300ns, the parts are guaranteed to have entered shutdown.
8/22
ST1480AB - ST1480ACTest circuits and typical characteristics
5 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
9/22
Test circuits and typical characteristicsST1480AB - 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
10/22
ST1480AB - ST1480ACTest 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
11/22
Test circuits and typical characteristicsST1480AB - 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
12/22
ST1480AB - ST1480ACTest 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
13/22
Test circuits and typical characteristicsST1480AB - 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
14/22
ST1480AB - ST1480ACTest circuits and typical characteristics
Figure 25. Receiver input characteristicsFigure 26. Driver short circuit current
15/22
Test circuits and typical characteristicsST1480AB - ST1480AC
Figure 27. Driver short circuit current
16/22
ST1480AB - ST1480ACPackage mechanical data
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
17/22
Package mechanical dataST1480AB - ST1480AC
Plastic DIP-8 mechanical data
Dim.
Min.Typ.Max.Min.Typ.Max.
A3.30.130
a10.70.028
B1.391.650.0550.065
B10.911.040.0360.041
b0.50.020
b10.380.50.0150.020
D9.80.386
E8.80.346
e2.540.100
e37.620.300
e47.620.300
F7.10.280
I4.80.189
L3.30.130
Z0.441.60.0170.063
mm.inch.
18/22
P001F
ST1480AB - ST1480ACPackage mechanical data
SO-8 mechanical data
Dim.
A1.351.750.0530.069
A10.100.250.040.010
A21.101.650.0430.065
B0.330.510.0130.020
C0.190.250.0070.010
D4.805.000.1890.197
E3.804.000.1500.157
e1.270.050
H5.806.200.2280.244
h0.250.500.0100.020
L0.401.270.0160.050
k8° (max.)
ddd0.10.04
Min.Typ.Max.Min.Typ.Max.
mm.inch.
0016023/C
19/22
Package mechanical dataST1480AB - ST1480AC
Tape & reel SO-8 mechanical data
mm.inch.
Dim.
Min.Typ.Max.Min.Typ.Max.
A33012.992
C12.813.20.5040.519
D20.20.795
N602.362
T22.40.882
Ao8.18.50.3190.335
Bo5.55.90.2160.232
Ko2.12.30.0820.090
Po3.94.10.1530.161
P7.98.10.3110.319
20/22
ST1480AB - ST1480ACRevision history
7 Revision history
Table 12.Document revision history
DateRevisionChanges
02-May-20062Order codes updated.
19-Nov-20073Added Ta bl e 1 .
21/22
ST1480AB - ST1480AC
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