ST ST1480AB, ST1480AC User Manual

3.3 V powered, 15 kV ESD protected,
up to 12 Mbps true RS-485/RS-422 transceiver
Features
ESD protection
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 number 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
November 2007 Rev 3 1/22
www.st.com
22
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
ST1480AB - ST1480AC Pin configuration

1 Pin configuration

Figure 2. Pin connections

Table 1. Pin description

Pin n° Symbol Name and function
1 RO Receiver output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be low
2RE
3DE
4DI
5 GND Ground
6 A Non-inverting receiver input and non-inverting driver output
7 B Inverting 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 tables ST1480AB - ST1480AC

2 Truth tables

Table 2. Truth table (driver)

Inputs Outputs
Mode
RE
XHHLH Normal
XHLHL Normal
LLXZZ Normal
H L X Z Z Shutdown
Note: X= Don’t care; Z=High impedance

Table 3. Truth table (receiver)

RE DE A-B RO
DE DI B A
Inputs Output
Mode
LL
LL
L L Inputs open H Normal
L L Inputs shorted H Normal
H L X Z Shutdown
-0.015V H Normal
-0.2V L Normal
Note: X= Don’t care; Z=High impedance
4/22
ST1480AB - ST1480AC Maximum ratings

3 Maximum ratings

Table 4. Absolute maximum ratings

Symbol Parameter Value Unit
V
CC
V
I
V
DI
V
DO
V
RI
V
RO
Supply voltage 7 V
Control input voltage (RE, DE) -0.3 to 7 V
Driver input voltage (DI) -0.3 to 7 V
Driver output voltage (A, B) ± 14 V
Receiver input voltage (A, B) ± 14 V
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 ± 8kV
5/22
Electrical characteristics ST1480AB - ST1480AC

4 Electrical characteristics

Table 6. Electrical characteristics
= 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
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
SUPPLYVCC
I
SHDN
Shutdown supply current DE=0V, RE=VCC, DI=0V or VCC 0.002 1 µA
Power supply current No Load, DI=0V or V
DE=VCC, RE=0V or V
CC
DE=0V, RE
CC
=0V
1.3 2.2 mA
1.2 1.9 mA
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
Symbol Parameter Test conditions Min. Typ. Max. Unit
Input logic threshold low DE, DI, RE 1.3 0.8 V
IL
Input logic threshold high DE, DI, RE 2 V
IH
Logic input current DE, DI, RE ± 2.0 µA
V
=12V 1 mA
Input current (A, B) DE=0V, VCC= 0 or 3.6V
IN
V
=-7V -0.8 mA
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
Symbol Parameter Test conditions Min. Typ. Max. Unit
R
= 100Ω (RS-422) (Figure 2)2 V
L
V
Differential drive output
OD
= 54Ω (RS-485) (Figure 2)1.5 V
R
L
R
= 60Ω (RS-485) (Figure 3)1.5 V
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
± 250 mA
ST1480AB - ST1480AC Electrical 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
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
ΔV
V
V
I
OZR
R
I
OSR
Receiver differential
TH
threshold voltage
Receiver input hysteresis VCM = 0V 30 V
TH
Receiver output high
OH
voltage
Receiver output low
OL
voltage
3-State (high impedance) output current at receiver
Receiver input resistance VCM = -7V to 12V 24 kΩ
RIN
Receiver short-circuit current
V
= -7V to 12V, DE = 0 -0.2 -0.015 V
CM
I
= -4mA, VID = 200mV, (Figure 9)2 V
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
± A
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
Symbol Parameter Test Conditions Min. Typ. Max. Unit
D
t
DD
t
TD
Maximum data rate 12 15 Mbps
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)
18 30 ns
12 20 ns
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)
18 30 ns
25ns
Output enable time RL= 110Ω, (Figure 11 and Figure 12)1935ns
Output enable time RL= 110Ω, (Figure 7 and Figure 8)3050ns
Output disable time RL= 110Ω, (Figure 7 and Figure 8)1935ns
Output disable time RL= 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
30 50 ns
19 35 ns
7/22
Electrical characteristics ST1480AB - 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
Symbol Parameter Test Conditions Min. 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 time CRL = 15pF, (Figure 15 and Figure 19)1020ns
Output enable time CRL = 15pF, (Figure 15 and Figure 19)1020ns
Output disable time CRL = 15pF, (Figure 15 and Figure 19)1020ns
Output disable time CRL = 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
30 50 ns
13ns
Note: 1 ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes
state.
2 Measured on |t
PLH
(A)-t
(A)| and |t
PHL
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 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 - ST1480AC Test 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 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

10/22
ST1480AB - ST1480AC 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

11/22
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

12/22
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

13/22
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

14/22
ST1480AB - ST1480AC Test circuits and typical characteristics
Figure 21. Receiver output current vs output

Figure 23. Low level driver output capability Figure 24. High level driver output capability

low voltage
Figure 22. Receiver output current vs output
high voltage

Figure 25. Receiver input characteristics Figure 26. Driver short circuit current

15/22
Test circuits and typical characteristics ST1480AB - ST1480AC

Figure 27. Driver short circuit current

16/22
ST1480AB - ST1480AC Package 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 data ST1480AB - ST1480AC
Plastic DIP-8 mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A 3.3 0.130
a1 0.7 0.028
B1.39 1.65 0.055 0.065
B1 0.91 1.04 0.036 0.041
b 0.5 0.020
b10.38 0.5 0.015 0.020
D 9.8 0.386
E 8.8 0.346
e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 7.1 0.280
I4.8 0.189
L 3.3 0.130
Z 0.44 1.6 0.017 0.063
mm. inch.
18/22
P001F
ST1480AB - ST1480AC Package mechanical data
SO-8 mechanical data
Dim.
A1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B0.33 0.51 0.013 0.020
C0.19 0.25 0.007 0.010
D4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H5.80 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 8° (max.)
ddd 0.1 0.04
Min. Typ. Max. Min. Typ. Max.
mm. inch.
0016023/C
19/22
Package mechanical data ST1480AB - ST1480AC
Tape & reel SO-8 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 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
P7.98.1 0.311 0.319
20/22
ST1480AB - ST1480AC Revision history

7 Revision history

Table 12. Document revision history

Date Revision Changes
02-May-2006 2 Order codes updated.
19-Nov-2007 3 Added Ta bl e 1 .
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ST1480AB - ST1480AC
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