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ST485A
Very high speed low power RS-485/RS-422 transceiver
General features
s s s s s
Low supply current: 5mA max High data rate > 30Mbps Designed for RS 485 interface applications -7 to 12 common mode input voltage range Driver maintains high impedance in 3-state or with the power off 70mV typical input hysteresis Operate from single 5 supply 4kV ESD protection Current limiting and thermal shutdown for driver overload protection Latch-up free up to 500mA Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit. The ST485A is designed for bi-directional data communications or multipoint bus transmission lines.
DIP-8 SO-8
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Description
The ST485A is a low power, high speed transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST485A draws 3mA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5V supply.
Order code
Part number ST485ACN ST485ABN ST485ACDR ST485ABDR March 2006 Temperature range 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C Package DIP-8 DIP-8 SO-8 (Tape & reel) SO-8 (Tape & reel) Rev 2 Comments 50parts per tube / 40tube per box 50parts per tube / 40tube per box 2500 parts per reel 2500 parts per ree 1/19
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Contents
ST485A
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 3 4
Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 4.2 4.3 4.4 4.5 Logic input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Driver switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Receiver switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 6 7
Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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ST485A
Pin configuration
1
Pin configuration
Figure 1. Pin configuration
1.1
Pin description
Table 1.
Pin n 1
Pin description
Name and function Receiver output. If A>B by 200mV, RO will be high; if ASymbol RO
2
RE
3
DE
4 5 6 7 8
DI GND A B VCC
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Truth tables
ST485A
2
Truth tables
Table 2.
Truth table (driver)
Inputs Outputs DI H L X B L H Z A H L Z Mode A Normal Normal Normal
RE X X L
DE H H L
Note: Table 3.
X = Don't care; Z = High impedance Truth table (receiver)
Inputs RE L L L DE L L L

Outputs Mode A-B -0.2V -0.2V RO H L H Normal Normal Normal
INPUTS OPEN
Note:
X = Don't care; Z = High impedance
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ST485A
Maximum ratings
3
Table 4.
Symbol VCC VI VDI VDO VRI VRO
Maximum ratings
Absolute maximum ratings
Parameter 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) Value 7 -0.3 to 7 -0.3 to 7 -7.5 to 12.5 -7.5 to 12.5 -0.3 to (VCC + 0.3) Unit V V V V V V
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
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Electrical characteristics
ST485A
4
Electrical characteristics
(V CC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C, VCC = 5V) (Note: 1) DC Electrical characteristics
Parameter Test conditions No load, VRE=0V or V CC VDE = VCC VDE = 0V Min Typ 2.3 2.6 10 10 Max 5 5 Unit mA mA pF pF
Table 5.
Symbol
ISUPPLY VCC Power supply current CI/O CAB Input/output capacitance Driver output capacity
4.1
Table 6.
Symbol VIL VIH IIN1 IIN2
Logic input
(V CC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C, VCC = 5V) (Note: 1) Logic input electrical characteristics
Parameter Input logic threshold low Input logic threshold high Logic input current Input current (A, B) DE, DI, RE DE, DI, RE DE, DI, RE VDE=0V, VCC = 0 or 5.25V VIN=12V VIN=-7V 2 2.0 1 -0.8 Test conditions Min Typ Max 0.8 Unit V V A mA mA
4.2
Table 7.
Symbol VOD1 VOD2 VOD
Transmitter
(V CC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C, VCC = 5V) (Note: 1) Transmitter electrical characteristics
Parameter Differential driver output (No load) Differential driver output (with load) Change in magnitude of driver differential output voltage for complementary output states (Note: 1) Driver common mode output voltage Change in magnitude of driver common mode output voltage (Note: 1) Driver short circuit output current RL= 54 (RS-422) VCM= -7V to 12V 1.5 2.7 Test conditions Min Typ Max 5 5 Unit V V
RL= 27 or 50
0
0.2
V
VOC VOC IOSD
RL= 27 or 50
1
3
V
RL= 54 or 100 VO= -7V to 12V
0
0.2 250
V mA
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ST485A
Electrical characteristics
4.3
Table 8.
Symbol VTH VTH VOH VOL IOZR RRIN IOSR
Receiver
(V CC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C, VCC = 5V) (Note: 1) Receiver electrical characteristics
Parameter Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage 3-State (High Impedance) Output Current at Receiver Receiver Input Resistance Receiver Short-Circuit Current Test conditions VCM = -7V to 12V VCM = 0V IOUT = -4mA, VID = 200mV IOUT = 4mA, V ID = -200mV VO = 0.4V to 2.4V VCM = -7V to 12V VO = 0V to VCC 12 7 24 95 3.5 Min -0.2 70 4.7 0.2 0.4 1 Typ Max 0.2 Unit V mV V V A K mA
4.4
Table 9.
Symbol DR tPLH tPHL tSKEW tTLH tTHL tPZL tPZH tPHZ tPLZ tSK(EN) tSK(DS)
Driver switching
(V CC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C, VCC = 5V) (See Note: 1, 3) Driver switching characteristics
Parameter Maximum data rate Propagation delay input to output Differential output delay skew Rise or fall differential time Output enable time Output enable time Output disable time Output disable time Synchronous driver operation a-b at enable Synchronous driver operation A-B at disable 4 Test conditions Jitter < 5% RL= 54, CL1=C L2=50pF, (Figure 1) RL= 54, CL1=C L2=50pF, (Figure 1) RL= 54, CL1=C L2=50pF, (Figure 1) CL= 50pF, S1 Closed CL= 50pF, S2 Closed CL= 15pF, S2 Closed CL= 15pF, S1 Closed Min 30 Typ 50 18 0.5 8 30 2 12 30 30 30 30 2 6 Max Unit Mbps ns ns ns ns ns ns ns ns ns
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Electrical characteristics
ST485A
4.5
Table 10.
Symbol tPLH tPHL tRPDS tPZL tPZH tPHZ tPLZ
Receiver switching
(V CC = 4.5V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C, VCC = 5V) (See Note: 1, 3) Driver switching characteristics
Parameter Propagation Delay Test conditions CL = 15pF Min Typ 18 0.5 7 7 7 7 Max 30 2 12 12 12 12 Unit ns ns ns ns ns ns
|tPLH - tPHL| Propagation delay skew CL = 15pF Output enable time Output enable time Output disable time Output disable time CRL = 15pF, S1 Closed CRL = 15pF, S2 Closed CRL = 15pF, S2 Closed CRL = 15pF, S1 Closed
Note:
1 2 3
All currents into device pins are positive; all currents out of device pins are negative; all voltages are referenced to device ground unless specified. Applies to peak current. See typical Operating Characteristics. tr=tf 6ms.
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ST485A
Test circuit and typical characteristics
5
Test circuit and typical characteristics
Figure 2. Driver DC test load
Figure 3.
Receiver timing test load
Figure 4.
Driver/receiver timing test circuit
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Test circuit and typical characteristics Figure 5. Driver Timing Test Load
ST485A
Figure 6.
Driver timing test load
Figure 7.
Driver enable and disable time
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ST485A Figure 8. Receiver propagation delay
Test circuit and typical characteristics
Figure 9.
Receiver enable and disable time
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Test circuit and typical characteristics Figure 10. Receiver output current vs. output voltage (output low) Figure 11.
ST485A Receiver output current vs. output voltage (output high)
Figure 12. Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output Low)
Figure 13. Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output Low)
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ST485A
Test circuit and typical characteristics
Figure 14. Driver Short Circuit Current vs Line Figure 15. Driver Short Circuit Current vs. Voltage (Output High) Line Voltage (Output Low)
Figure 16. Receiver Input Current vs Input Voltage
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Package mechanical data
ST485A
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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
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ST485A
Package mechanical data
Plastic DIP-8 MECHANICAL DATA
mm. DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. TYP. 0.130 MAX. inch
P001F
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Package mechanical data
ST485A
SO-8 MECHANICAL DATA
DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157
8 (max.)
0.04
0016023/C
16/19
ST485A
Package mechanical data
Tape & Reel SO-8 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
ST485A
7
Table 11.
Date
Revision history
Revision history
Revision 2 Changes Order codes has been updated and new template.
28-Mar-2006
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ST485A
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