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ST485
LOW POWER RS-485/RS-422 TRANSCEIVER
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LOW QUIESCENT CURRENT: 300A DESIGNED FOR RS-485 INTERFACE APPLICATIONS -7V TO 12V COMMON MODE INPUT VOLTAGE RANGE DRIVER MAINTAINS HIGH IMPEDANCE IN 3-STATE OR WITH THE POWER OFF 70mV TYPICAL INPUT HYSTERESIS 30ns PROPAGATION DELAYS, 5ns SKEW OPERATE FROM A SINGLE 5V SUPPLY CURRENT LIMITING AND THERMAL SHUTDOWN FOR DRIVER OVERLOAD PROTECTION ALLOWS UP TO 64 TRANSCEIVERS ON THE BUS
DIP
SOP
DESCRIPTION The ST485 is al low power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver. This transceiver draw 300A (typ.) of supply current when unloaded or fully loaded with disabled drivers. ORDERING CODES
Type ST485CN ST485BN ST485XN ST485CD ST485BD ST485XD ST485CDR ST485BDR ST485XDR Temperature Range 0 to 70 C -40 to 85 C -55 to 125 C 0 to 70 C -40 to 85 C -55 to 125 C 0 to 70 C -40 to 85 C -55 to 125 C Package
It operates from a single 5V supply. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that placed the driver outputs into a high-impedance state. . The ST485 is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applciations). The ST485 is available in three temperature range: commercial (0C to 70C), industrial (-40C to 850C) and automotive (-55C to 125C)
Comments 50parts per tube / 40tube per box 50parts per tube / 40tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 100parts per tube / 20tube per box 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel 2500 parts per reel
DIP-8 DIP-8 DIP-8 SO-8 (Tube) SO-8 (Tube) SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tape & Reel) SO-8 (Tape & Reel)
June 2003
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PIN CONFIGURATION
PIN DESCRIPTION
PlN N 1 2 3 4 5 6 7 8 SYMBOL RO RE DE DI GND A B VCC NAME AND FUNCTION Receiver Output Receiver Output Enable Driver Output Enable Driver Input Ground Non-inverting Receiver Input and Non-inverting Driver Output Inverting Receiver Input and Inverting Driver Output Supply Voltage
TRUTH TABLE (DRIVER)
INPUTS RE X X X DE H H L DI H L X OUTPUTS B L H Z A H L Z
TRUTH TABLE (RECEIVER)
INPUTS RE L L L H DE L L L L A-B +0.2V -0.2V INPUTS OPEN X OUTPUT RO H L H Z
X= Don't Care; Z=High Impedance
X= Don't Care; Z=High Impedance
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VDI VDO VRI VRO 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) Parameter 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
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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DC ELECTRICAL CHARACTERISTICS (VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1)
Value Symbol Parameter Test Conditions -40 to 85 C Min. VOD1 VOD2 VOD Differential Driver Output (No Load) Differential Driver Output (With Load) Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Driver Common-Mode Output 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) Typ. Max. 5 RL = 27 (RS-485) (See Fig.1) RL = 50 (RS-422) (See Fig.1) RL = 27 or 50 (See Fig. 1) 1.5 5 5 0.2 1.4 -55 to 125 C Min. Max. 5 5 5 0.2 V V V V Unit
VOC VOC
RL = 27 or 50 (See Fig. 1) RL = 27 or 50 (See Fig. 1)
3 0.2
3 0.2
V V
VIH VIL IIN1 IIN2
RE, DE, DI RE, DE, DI RE, DE, DI VCM = 0V or 5.25V VDE = 0V VIN = 12V VIN = -7V
2.0 0.8 2 1 -0.8 -0.2 70 3.5 0.4 1 0.2
2.0 0.8 2 1 -0.8 -0.2 0.2
V V A mA mA V mV
VTH VTH VOH VOL IOZR
Receiver Differential VCM = -7 to 12V Threshold Voltage Receiver Input Hysteresis VCM = 0V Receiver Output High Voltage Receiver Output Low Voltage 3-State (High Impedance) Output Current at Receiver Receiver Input Resistance No Load Supply Current (Note 2) Driver Short-Circuit Current, VO=High Driver Short-Circuit Current, VO=Low Receiver Short-Circuit Current IO = -4mA IO = 4mA VID = 200mV VID = -200mV
3.4 0.55 1
V V A
VO = 0.4 to 2.4V
RIN ICC
VCM = -7 to 12V VRE = 0V or VCC VDE = VCC VDE = 0V VO = -7 to 12V (Note 3) VO = -7 to 12V (Note 3) VO = 0V to VCC
24
24
K
400 300 35 35 7
900 500 250 250 95 35 35 7
900 500 250 250 95
A A mA mA mA
IOSD1 IOSD2 IOSR
Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. Note 2: Supply current specification is valid for loaded transmitters when VDE = 0V Note 3: Applies to peak current. See typical Operating Characteristics.
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ST485
DRIVER SWITCHING CHARACTERISTICS (VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1)
Value Symbol Parameter Test Conditions -40 to 85 C Min. tPLH tPHL tSK tTLH tTHL tPZH tPZL tPLZ tPHZ Propagation Delay Input to Output Output Skew to Output Rise or Fall Time RDIFF = 54 CL1 = CL2 = 100pF (See Fig. 3 and 5) RDIFF = 54 CL1 = CL2 = 100pF (See Fig. 3 and 5) RDIFF = 54 CL1 = CL2 = 100pF (See Fig. 3 and CL = 100pF (See Fig. 4 and CL = 100pF (See Fig. 4 and CL = 15pF (See Fig. 4 and CL = 15pF (See Fig. 4 and 5) S2 = Closed 6) S1 = Closed 6) S1 = Closed 6) S2 = Closed 6) 70 90 90 ns 70 90 90 ns 70 90 90 ns 70 90 90 ns 10 Typ. 30 5 3 15 Max. 60 10 40 3 -55 to 125 C Min. Max. 70 10 45 ns ns ns Unit
Output Enable Time Output Enable Time Output Disable Time Output Disable Time
Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified.
RECEIVER SWITCHING CHARACTERISTICS (VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1)
Value Symbol Parameter Test Conditions -40 to 85 C Min. tPLH tPHL tSKD Propagation Delay Input to Output Differential Receiver Skew Output Enable Time Output Enable Time Output Disable Time Output Disable Time Maximum Data Rate RDIFF = 54 100pF (See Fig. 3 and RDIFF = 54 100pF (See Fig. 3 and CRL = 15pF (See Fig. 2 and CRL = 15pF (See Fig. 2 and CRL = 15pF (See Fig. 2 and CRL = 15pF (See Fig. 2 and CL1 = CL2 = 7) CL1 = CL2 = 7) S1 = Closed 8) S2 = Closed 8) S1 = Closed 8) S2 = Closed 8) 2.5 2.5 Mbps 20 50 56 ns 20 50 56 ns 20 50 56 ns 20 50 56 ns 13 ns 20 Typ. 130 Max. 210 -55 to 125 C Min. Max. 230 ns Unit
tPZH tPZL tPLZ tPHZ fMAX
Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified.
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ST485
TEST CIRCUITS AND TYPICAL CHARACTERISTICS Figure 1 : Driver DC Test Load Figure 3 : Drive/Receiver Timing Test Circuit
Figure 2 : Receiver Timing Test Load
Figure 4 : Driver Timing Test Load
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Figure 5 : Driver Propagation Delay
Figure 6 : Driver Enable and Disable Time
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Figure 7 : Receiver Propagation Delay
Figure 8 : Receiver Enable and Disable Time
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Figure 9 : Receiver Output Current vs Output Low Voltage Figure 12 : Driver Output Current vs Output High Voltage
Figure 10 : Receiver Output Current vs Output High Voltage
Figure 13 : Supply Current vs Temperature
Figure 11 : Driver Output Current vs Output Low Voltage
Figure 14 : Receiver High Level Output Voltage vs Temperature
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ST485
Figure 15 : Receiver Low Level Output Voltage vs Temperature Figure 16 : Differential Driver Output Voltage vs Temperature
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ST485
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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ST485
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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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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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2003 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com
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