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ST3485E
3.3V POWERED, 15KV ESD PROTECTED, TRASMIT AT UP TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER
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ESD PROTECTION: 15KV HUMAN BODY MODEL 8KV IEC 1000-4-2 CONTACT DISCHARGE OPERATE FROM A SINGLE 3.3V SUPPLY NO CHARGE PUMP REQUIRED INTEROPERABLE WITH 5V LOGIC 1A 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 INPUTS WITH NO SIGNAL PRESENT ALLOW UP TO 64 TRANSCEIVERS ON THE BUS
DIP
SOP
DESCRIPTION The ST3485E is 15kV ESD protected, 3.3V low power transceiver for RS-485 and RS-422 communications. The device contains one driver ORDERING CODES
Type ST3485ECN ST3485EBN ST3485ECD ST3485EBD ST3485ECDR ST3485EBDR Temperature Range 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C Package
and one receiver in half duplex configuration. The ST3485E transmit and receive at guaranteed data rate at least to 12Mbps. All transmitter outputs and receiver inputs are protected to 15kV using Human Body Model. 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 ST3485E input has a true fail-safe feature that guarantees a logic high output if both inputs are open circuit, shorted together or in presence of the termination with no signal on the bus.
Comments 50parts per tube / 40tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel
DIP-8 DIP-8 SO-8 (Tube) SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tape & Reel)
October 2002
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ST3485E
PIN CONFIGURATION
PIN DESCRIPTION
PlN N 1 2 SYMBOL RO RE NAME AND FUNCTION Receiver Output. If A>B by 200mV, RO will be high; if A3
DE
4 5 6 7 8
DI GND A B VCC
TRUTH TABLE (DRIVER)
INPUTS RE X X L H DE H H L L DI H L X X OUTPUTS MODE B L H Z Z A H L Z Z Normal Normal Normal Shutdown
TRUTH TABLE (RECEIVER)
INPUTS RE DE L L L L H L L L L L A-B -0.015V -0.2V Inputs Open Inputs Shorted X OUTPUT MODE RO H L H H Z Normal Normal Normal Normal Shutdown
X= Don't Care; Z=High Impedance
X= Don't Care; Z=High Impedance
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ST3485E
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 -0.3 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
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS
Symbol ESD ESD Parameter ESD Protection Voltage ESD Protection Voltage Test Conditions Human Body Model IEC-1000-4-2 Contact Disharge Min. Typ. 15 8 Max. Unit KV KV
ELECTRICAL CHARACTERISTICS VCC = 3V to 3.6V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol Parameter Test Conditions No Load, DI=0V or VCC DE=VCC, RE=0V or VCC DE=0V, RE=0V ISHDN Shutdown Supply Current DE=0V, RE=VCC, DI=0V or VCC Min. Typ. 1.3 1.2 0.002 Max. 2.2 1.9 1 Unit mA mA A ISUPPLY VCC Power Supply Current
LOGIC INPUT ELECTRICAL CHARACTERISTICS VCC = 3V to 3.6V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol VIL VIH IIN1 IIN2 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 DE=0V, VCC= 0 or 3.6V VIN=12V VIN=-7V 2 2.0 1 -0.8 Test Conditions Min. Typ. 1.3 Max. 0.8 Unit V V A mA mA
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ST3485E
TRANSMITTER ELECTRICAL CHARACTERISTICS VCC = 3V to 3.6V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol VOD Parameter Differential Drive Output Test Conditions RL= 100 (RS-422) (Figure 1) RL= 54 (RS-485) (Figure 1) RL= 60 (RS-485) (Figure 2) VOD Change in magnitude of RL= 54 or 100 (Figure 1) Driver Differential Output Voltage for Complementary Output States (Note1) Driver Common Mode RL= 54 or 100 (Figure 1) Output Voltage Change in magnitude of RL= 54 or 100 (Figure 1) Driver Common Mode Output Voltage (Note1) Driver Short Circuit Output Current Min. 2 1.5 1.5 0.2 Typ. Max. Unit V V V V
VOC VOC
3 0.2
V V
IOSD
250
mA
RECEIVER ELECTRICAL CHARACTERISTICS VCC = 3V to 3.6V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol VTH VTH VOH VOL IOZR RRIN IOSR 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, DE = 0 VCM = 0V IOUT = -4mA, VID = 200mV, (Figures 8,9) IOUT = 4mA, VID = -200mV, (Figure 3) VCC = 3.6V VO = 0V to VCC 24 7 60 2 0.4 1 Min. -0.2 30 Typ. Max. -0.015 Unit V V V V A K mA
VCM = -7V to 12V VRO = 0V to VCC
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ST3485E
DRIVER SWITCHING CHARACTERISTICS VCC = 3V to 3.6V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol DR tDD tTD tPLH tPHL tPDS tPZL tPZH tPHZ tPLZ tSKEW Parameter Maximum Data Rate Differential Output Delay Differential Output Transition Time Propagation Delay |tPLH - tPHL| Propagation Delay Skew (Note2) Output Enable Time Output Enable Time Output Disable Time Output Disable Time RL= 60 RL= 60 RL= 27 RL= 27 RL= 110 RL= 110 RL= 110 RL= 110 CL = 15pF, (Figures 4,5) CL = 15pF, (Figures 4,5) CL = 15pF, (Figures 8,9) CL = 15pF, (Figures 8,9) (Figures 10,11) (Figures 6,7) (Figures 6,7) (Figures 10,11) Test Conditions Min. 12 Typ. 15 18 12 18 2 19 30 19 30 1 30 19 30 20 30 5 35 50 35 50 3 50 35 Max. Unit Mbps ns ns ns ns ns ns ns ns ns ns ns
Differential Output Delay Skew tZH(SHDN) Driver Enable from Shutdown to Output High tZL(SHDN) Driver Enable from Shutdown to Output Low
RECEIVER SWITCHING CHARACTERISTICS VCC = 3V to 3.6V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to Ta = 25C)
Symbol tPLH tPHL tRPDS tPZL tPZH tPHZ tPLZ Parameter Propagation Delay |tPLH - tPHL| Propagation Delay Skew Output Enable Time Output Enable Time Output Disable Time Output Disable Time Test Conditions VID =0V to 3V CL1 = 15pF, (Figures 12,13) VID =0V to 3V CL1 = 15pF, (Figures 12,13) CRL = 15pF (Figures 14-18) CRL = 15pF (Figures 14-18) CRL = 15pF (Figures 14-18) CRL = 15pF (Figures 14-18) CRL = 15pF (Figures 14-18) CRL = 15pF (Figures 14-18) Min. Typ. 30 1 10 10 10 10 10 20 Max. 50 3 20 20 20 20 20 40 Unit ns ns ns ns ns ns ns ns
tZH(SHDN) Receiver Enable from Shutdown to Output High tZL(SHDN) Receiver Enable from Shutdown to Output Low
Note 1: VOD and VOC are the changes in VOD and VOC , respectively, when the DI input changes state. Note 2: measured on |tPLH(A)-tPHL (A)| and |tPLH(B)-tPHL(B)| Note 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 guarenteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guarenteed to have entered shutdown.
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ST3485E
TEST CIRCUITS AND TYPICAL CHARACTERISTICS Figure 1 : Driver and VOC Test Load
Figure 2 : Driver VOD with Varying Common Mode Voltage Test Load
Figure 3 : Receiver VOH and VOL Test Circuit
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ST3485E
Figure 4 : Drive Differential Output Delay Transition Time Test Circuit
Figure 5 : Drive Differential Output Delay Transition Time Waveform
Figure 6 : Drive Enable and Disable Times Test Circuit
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ST3485E
Figure 7 : Drive Enable and Disable Times Waveforms
Figure 8 : Drive Propagation Time Test Circuit
Figure 9 : Drive Propagation Time Waveform
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ST3485E
Figure 10 : Drive Enable and Disable Times Test Circuit
Figure 11 : Drive Enable and Disable Times Waveforms
Figure 12 : Receiver Propagation Delay Time Test Circuit
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ST3485E
Figure 13 : Receiver Propagation Delay Time Waveforms
Figure 14 : Receiver Enable and Disable Times Test Circuit
Figure 15 : Receiver Enable and Disable Times Waveform
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ST3485E
Figure 16 : Receiver Enable and Disable Times Waveform
Figure 17 : Receiver Enable and Disable Times Waveform
Figure 18 : Receiver Enable and Disable Times Waveform
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ST3485E
Figure 19 : Receiver Output Current vs Output Low Voltage Figure 22 : High Level Driver Output Capability
Figure 20 : Receiver Output Current vs Output High Voltage
Figure 23 : Receiver Input Characteristics
Figure 21 : Low Level Driver Output Capability
Figure 24 : Driver Short Circuit Current
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ST3485E
Figure 25 : Driver Short Circuit Current
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ST3485E
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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ST3485E
SO-8 MECHANICAL DATA
DIM. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.149 0.015 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm. MIN. TYP MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.023 0.196 0.244 0.025 0.013 0.007 0.010 0.003 MIN. inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019
0016023
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ST3485E
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) 2002 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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