ST485EB ST485EC - ST485EX
15 kV ESD protected, low power RS-485/RS-422 transceiver
Features
Low quiescent current: 300 A Designed for RS-485 interface application -7 V to 12 V common mode input voltage range Driver maintains high impedance in 3-state or with the power OFF 70 mV typical input hysteresis 30 ns propagation delay, 5 ns skew Operates from a single 5 V supply Current limiting and thermal shutdown for driver overload protection ESD protection: 15 kV (H.B.M.) 8 kV (IEC-1000-4-2 contact discharge) Allows up to 256 transceivers on the bus 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 ST485E is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications). SO-8
Description
The ST485E is a low power transceiver for RS485 and RS-422 communication. Each driver output and receiver input is protected against 15 kV electrostatic discharge (H.B.M.) (ESD) shocks, without latch-up. These parts contain one driver and one receiver in half duplex configuration. This transceiver draws 300 A (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V supply. Table 1. Device summary
Temperature range -40 to 85 C 0 to 70 C -40 to 85 C -55 to 125 C Package SO-8 (Tube) SO-8 (Tape and reel) SO-8 (Tape and reel) SO-8 (Tape and reel) Packaging 100par ts per tube / 20tube per box 2500 parts per reel 2500 parts per reel 2500 parts per reel
Order codes ST485EBD ST485ECDR ST485EBDR ST485EXDR
February 2008
Rev 13
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Contents
ST485EB - ST485EC - ST485EX
Contents
1 2 3 4 5 6 7 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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Pin configuration
1
Figure 1.
Pin configuration
Pin connections (top view)
Table 2.
Pin description
Symbol RO RE DE DI GND A B VCC Receiver output Receiver output enable Driver output enable Driver input Ground Non-inver ting receiver input and non-inverting driver output Inver ting receiver input and inverting driver output Supply voltage Name and function
Pin n 1 2 3 4 5 6 7 8
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Truth tables
ST485EB - ST485EC - ST485EX
2
Table 3.
Truth tables
Truth table (driver)
Inputs RE X X X DE H H L DI H L X B L H Z Outputs A H L Z
Note: Table 4.
X = Don't care; Z = High impedance Truth table (receiver)
Inputs RE L L L H DE L L L L
Outputs A-B +0.2V RO H L H Z
-0.2V
Inputs open X
Note:
X = Don't care; Z = High impedance
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Maximum ratings
3
Table 5.
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 -0.5 to (VCC + 0.5) -0.5 to (VCC + 0.5) 14 14 -0.5 to (VCC + 0.5) 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 is not implied. V+ and V- can have a maximum magnitude of +7 V, but their absolute addition exceed 13 V.
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Electrical characteristics
ST485EB - ST485EC - ST485EX
4
Table 6.
Symbol ESD ESD
Electrical characteristics
ESD performance: transmitter outputs, receiver inputs
Parameter ESD protection voltage ESD protection voltage Test conditions Human body model IEC-1000-4-2 Min. 15 8 Typ. Max. Unit kV kV
Table 7.
Symbol VOD1 VOD2
DC electrical characteristics (VCC = 5 V 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C)
Parameter Differential driver output (no load) Differential driver output (with load) Change in magnitude of driver differential output voltage for complementary output states RL = 27 (RS-485) (Figure 2) RL = 50 (RS-422) (Figure 2.) RL = 27 or 50 (Figure 2) 1.5 Test conditions (1) Min. Typ. Max. 5 5 5 Unit V V V
VOD
0.2
V
VOC
Driver common-mode output RL = 27 or 50 (Figure 2) voltage Change in magnitude of driver common-mode output voltage for complementary output states Input high voltage Input low voltage Input current Input current (A, B) Receiver differential threshold voltage Receiver input hysteresis
3
V
VOC
RL = 27 or 50 (Figure 2)
0.2
V
VIH VIL IIN1 IIN2
RE, DE, DI RE, DE, DI RE, DE, DI VCM = 0 V or 5.25 V, VDE = 0 V VIN = 12 V VIN = -7 V VCM = -7 to 12 V VCM = 0 V
2.0 0.8 2 1 -0.8 -0.2 70 3.5 0.4 1 96 400 300 35 900 500 250 0.2
V V A mA mA V mV V V A k A A mA
VTH VTH VOH VOL IOZR RIN ICC
Receiver output high voltage IO = -4 mA, VID = 200 mV Receiver output low voltage 3-State (high impedance) output current at receiver Receiver input resistance No load supply current (2) Driver short-circuit current, VO=High IO = 4 mA, VID = -200 mV VO = 0.4 to 2.4 V VCM = -7 to 12 V VRE = 0V or VCC VDE = VCC VDE = 0 V VO = -7 to 12 V (3)
IOSD1
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ST485EB - ST485EC - ST485EX Table 7.
Symbol IOSD2 IOSR
Electrical characteristics
DC electrical characteristics (continued) (VCC = 5 V 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C)
Parameter Driver short-circuit current, VO=Low Test conditions (1) VO = -7 to 12 V (3) Min. 35 7 Typ. Max. 250 95 Unit mA mA
Receiver short-circuit current VO = 0 V to VCC
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified. 2. Supply current specification is valid for loaded transmitters when VDE = 0 V 3. Applies to peak current. See typical Operating Characteristics.
Table 8.
Symbol tPLH t PHL tSK tTLH tTHL tPZH tPZL t PLZ t PHZ
Driver switching characteristics (VCC = 5 V 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C)
Parameter Test conditions (1) Min. Typ. 25 2 15 35 25 25 35 Max. 45 5 40 50 40 40 50 Unit ns ns ns ns ns ns ns Propagation delay input to RDIFF = 54 CL1 = CL2 = 100 pF , output (See Figure 4 and Figure 6) Output skew to output Rise or fall time Output enable time Output enable time Output disable time Output disable time , RDIFF = 54 CL1 = CL2 = 100 pF (See Figure 4 and Figure 6) , RDIFF = 54 CL1 = CL2 = 100 pF (See Figure 4 and Figure 6) CL = 100 pF, S2 = Closed (See Figure 5 and Figure 7) CL = 100 pF, S1 = Closed (See Figure 5 and Figure 7) CL = 15 pF, S1 = Closed (See Figure 5 and Figure 7) CL = 15 pF, S2 = Closed (See Figure 5 and Figure 7)
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified.
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Electrical characteristics
ST485EB - ST485EC - ST485EX
Table 9.
Symbol tPLH tPHL tSKD tPZH tPZL tPLZ tPHZ fMAX
Receiver switching characteristics (VCC = 5 V 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C)
Parameter Propagation delay input to output Differential receiver skew Output enable time Output enable time Output disable time Output disable time Maximum data rate Test conditions (1) RDIFF = 54 CL1 = CL2 = 100 pF , (See Figure 4 and Figure 8) RDIFF = 54 CL1 = CL2 = 100 pF , (See Figure 4 and Figure 8) CRL = 15 pF, S1 = Closed (See Figure 2 and Figure 9) CRL = 15 pF, S2 = Closed (See Figure 2 and Figure 9) CRL = 15 pF, S1 = Closed (See Figure 2 and Figure 9) CRL = 15 pF, S2 = Closed (See Figure 2 and Figure 9) 5 Min. Typ. 110 5 11 13 13 11 Max. 130 10 35 35 35 35 Unit ns ns ns ns ns ns Mbps
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified
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Test circuit and typical characteristics
5
Figure 2.
Test circuit and typical characteristics
Driver DC test load Figure 3. Receiver timing test load
Figure 4.
Drive/receiver timing test circuit
Figure 5.
Driver timing test load
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Test circuit and typical characteristics
ST485EB - ST485EC - ST485EX
Figure 6.
Driver propagation delay
Figure 7.
Driver enable and disable time
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Test circuit and typical characteristics
Figure 8.
Receiver propagation delay
Figure 9.
Receiver enable and disable time
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Test circuit and typical characteristics Figure 10. Receiver output current vs output low voltage
ST485EB - ST485EC - ST485EX Figure 11. Receiver output current vs output high voltage
Figure 12. Driver output current vs output low Figure 13. Driver output current vs output voltage high voltage
Figure 14. Supply current vs temperature
Figure 15. Receiver high level output voltage vs temperature
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ST485EB - ST485EC - ST485EX Figure 16. Receiver low level output voltage vs temperature
Test circuit and typical characteristics Figure 17. Differential driver output voltage vs temperature
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Package mechanical data
ST485EB - ST485EC - ST485EX
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
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Package mechanical data
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 8 (max.) 0.04 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
0016023/C
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Package mechanical data
ST485EB - ST485EC - ST485EX
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
7
Table 10.
Date
Revision history
Document revision history
Revision 9 10 11 12 13 Changes Order codes has been updated and new template. Change value row 10 on the features and RIN in Table 7. Typo mistake on page 1. Change value RIN min. on Table 7. Modified: Table 1 on page 1.
21-Mar-2006 05-Jun-2006 29-Jan-2007 29-Aug-2007 07-Feb-2008
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