MAX3097EEEE+ ,±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault DetectionMAX3097E/MAX3098E19-1727; Rev 0; 7/00±15kV ESD-Protected, 32Mbps, 3V/5V, Triple RS-422/RS-485 Recei ..
MAX3097EESE+ ,±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault DetectionElectrical Characteristics for thresh- Methodold values. ±8kV—IEC 1000-4-2, Contact Discharge Metho ..
MAX3098EACEE+ ,±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault DetectionELECTRICAL CHARACTERISTICS (continued)(V = +3V to +5.5V, T = T to T , unless otherwise noted. Typic ..
MAX3098EACEE+T ,±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault DetectionApplications♦ 32Mbps Data RateRS-485/RS-422 Receivers for Motor-ShaftEncoders♦ 16-Pin QSOP is 40% S ..
MAX3098EACSE+ ,±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault DetectionELECTRICAL CHARACTERISTICS(V = +3V to +5.5V, T = T to T , unless otherwise noted. Typical values ar ..
MAX3098EAEEE+ ,±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault DetectionApplications Information).Note 4: See
MAX6354LSUK-T ,Dual/Triple-Voltage レP Supervisory CircuitsApplicationsOrdering InformationComputers Intelligent InstrumentsPART* TEMP. RANGE PIN-PACKAGEContr ..
MAX6354LTUK+T ,Dual/Triple-Voltage µP Supervisory CircuitsApplicationsThe MAX6354/MAX6357/MAX6360 offer an active-low, ● Computers ● Intelligent Instrumentsp ..
MAX6354SYUK-T ,Dual/Triple-Voltage レP Supervisory CircuitsELECTRICAL CHARACTERISTICS(V 3 = V 5 = +1.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. ..
MAX6355LSUT+ ,Dual/Triple-Voltage µP Supervisory CircuitsElectrical Characteristics(V 1 = V 2 = +1.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. ..
MAX6355LSUT+T ,Dual/Triple-Voltage µP Supervisory CircuitsFeatures● Precision Monitoring of Multiple +1.8V, +2.5V, +3.0V, The MAX6351–MAX6360 microprocessor ..
MAX6355LSUT+T ,Dual/Triple-Voltage µP Supervisory CircuitsApplicationsThe MAX6354/MAX6357/MAX6360 offer an active-low, ● Computers ● Intelligent Instrumentsp ..
MAX3097ECEE+-MAX3097ECSE+-MAX3097EEEE+-MAX3097EESE+-MAX3098EACEE+-MAX3098EACEE+T-MAX3098EACSE+-MAX3098EAEEE+-MAX3098EBCEE+-MAX3098EBCSE+-MAX3098EBEEE+
±15kV ESD-Protected, 32Mbps, 3V/5V,Triple RS-422/RS-485 Receivers with Fault Detection
General DescriptionThe MAX3097E/MAX3098E feature three high-speed RS-
485/RS-422 receivers with fault-detection circuitry and
fault-status outputs. The receivers’ inputs have fault
thresholds that detect when the part is not in a valid state.
The MAX3097E/MAX3098E indicate when a receiver
input is in an open-circuit condition, short-circuit condi-
tion, or outside the common-mode range. They also
generate a fault indication when the differential input
voltage goes below a preset threshold. See Ordering
Informationor the Electrical Characteristicsfor thresh-
old values.
The fault circuitry includes a capacitor-programmable
delay to ensure that there are no erroneous fault condi-
tions even at slow edge rates. Each receiver is capable
of accepting data at rates up to 32Mbps.
________________________ApplicationsRS-485/RS-422 Receivers for Motor-Shaft
Encoders
High-Speed, Triple RS-485/RS-422 Receiver with
Extended Electrostatic Discharge (ESD)
Triple RS-485/RS-422 Receiver with Input Fault
Indication
Telecommunications
Embedded Systems
FeaturesDetects the Following RS-485 Faults:
Open-Circuit Condition
Short-Circuit Condition
Low Differential Voltage Signal
Common-Mode Range ViolationESD Protection
±15kV—Human Body Model
±15kV—IEC 1000-4-2, Air-Gap Discharge
Method
±8kV—IEC 1000-4-2, Contact Discharge MethodSingle +3V to +5.5V Operation -10V to +13.2V Extended Common-Mode RangeCapacitor-Programmable Delay of Fault Indication
Allows Error-Free Operation at Slow Data RatesIndependent and Universal Fault Outputs32Mbps Data Rate16-Pin QSOP is 40% Smaller than Industry-
Standard26LS31/32 Solutions
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5Vriple RS-422/RS-485Receivers with Fault DetectionAVCC
ALARMA
OUTA
ALARMB
OUTB
ALARMZ
OUTZ
ALARMD
TOP VIEW
MAX3097E
MAX3098E
QSOP/SO/DIPGND
DELAY
Pin ConfigurationENCODED SIGNALS
A, A, B, B, Z, Z
MOTOR DRIVER
MOTOR
MOTOR
CONTROLLER
ALARM
OUTPUTS
RECEIVER
OUTPUTS
DSP
MAX3097E
MAX3098E
MAX547
12-BIT D/A
Typical Application Circuit19-1727; Rev 0; 7/00
Ordering Information
PARTTEMP. RANGEPIN-
PACKAGE
MAX3097ECEE0°C to +70°C16 QSOP
MAX3097ECSE0°C to +70°C16 SO
Ordering Information continued at end of data sheet.
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5V, riple RS-422/RS-485Receivers with Fault Detection
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +3V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA = +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC).............................................................+7V
Receiver Input Voltage (A, A, B, B, Z, Z).............................±25V
Output Voltage (OUT_, ALARM_)...............-0.3V to (VCC+ 0.3V)
DELAY........................................................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
16-Pin SO (derate 8.7mW/°C above +70°C).................696mW
16-Pin Plastic DIP (derate 10.53mW/°C
above +70°C).............................................................762mW
Operating Temperature Ranges
MAX3097EC_E...................................................0°C to +70°C
MAX3098E_C_E.................................................0°C to +70°C
MAX3097E_E_E..............................................-40°C to +85°C
MAX3098E_E_E..............................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCC35.5V
Supply CurrentICCNo load3.14.0mA
Receiver Differential Threshold
Voltage (Note 1)VTH-10V ≤ VCM ≤ 13.2V-200+200mV
Receiver Input HysteresisΔVTH-10V ≤ VCM ≤ 13.2V40mV
VCC = 4.75V, IO = -4mA, VID = 200mVVCC - 1.5Output High VoltageVOHVCC = 3.0V, IO = -1mA, VID = 200mVVCC - 1.0V
VCC = 4.75V, IO = +4mA, VID = -200mV0.4Output Low VoltageVOLVCC = 3.0V, IO = +1mA, VID = -200mV0.4V
Receiver Input ResistanceRIN-10V ≤ VCM ≤ 13.2V90160kΩ
VIN = 13.2V
(Note 2)0.070.14Input Current
(A , A , B , B (Z , Z )IINVCC = 0 or 5.5VVIN = -10V
(Note 2)-0.05-0.11
Output Short-Circuit CurrentIOSR0 ≤ VRO ≤ VCC±105mA
FAULT DETECTIONFDIFHHigh limit275475MAX3097E Fault-Detection
Receiver Differential Threshold
Voltage (Note 3)FDIFL
VCM = 0
Low limit-475-275
FDIFHHigh limit0.120.20MAX3098EA Fault-Detection
Receiver Differential Threshold
Voltage (Note 3)FDIFL
VCM = 0
Low limit-0.20-0.12
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5Vriple RS-422/RS-485Receivers with Fault Detection
ELECTRICAL CHARACTERISTICS (continued)(VCC= +3V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA = +25°C.)
SWITCHING CHARACTERISTICS(VCC= +3V to +5.5V, VID= ±3.0V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVCC = 4.5V to 5.5V75Propagation Delay from Input to
OutputtPLH, tPHLCL = 15pF,
Figures 1, 2VCC = 3.0V to 3.6V85ns
Receiver Skew |tPLH - tPHL|tSKEWCL = 15pF, Figures 1, 2±10ns
Channel-to-Channel
Propagation Delay SkewCL = 15pF, Figures 1, 2±10ns
Maximum Data RatefMAXCL = 15pF, Figure 132Mbps
FAULT DETECTIONtDFLH15Differential Fault Propagation
Delay to Output (Note 5)tDFHL
CLF = 15pF, Figures 1, 3
MAX3097E (Note 6)1.0Minimum Differential Slew Rate
to Avoid False Alarm OutputMAX3098E (Note 7)0.33
V/μs
tCMFLH15Common-Mode Fault
Propagation Delay to Output
(Note 5)tCMFHL
CL = 15pF, Figures 1, 4
Note 1:VCMis the common-mode input voltage. VIDis the differential input voltage.
Note 2:VINis the input voltage at pins A, A, B, B, Z, Z.
Note 3:A differential terminating resistor is required for proper function of open-circuit fault detection (see Applications Information).
Note 4:See Applications Informationfor a discussion of the receiver common-mode voltage range and the operating conditions for
fault indication.
Note 5:Applies to the individual channel immediate-fault outputs (ALARM_) and the general delayed-fault output (ALARMD) when
there is no external capacitor at DELAY.
Note 6:Equivalent pulse test: 1.3V / (tDFLH- tDFHL) ≥SRD.
Note 7:Equivalent pulse test: 0.62V / (tDFLH- tDFHL) ≥SRD.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSFDIFHHigh limit70250MAX3098EB Fault-Detection
Receiver Differential Threshold
Voltage (Note 3)FDIFL
VCM = 0
Low limit-250-70
FCMHHigh limit13.2Fault-Detection Common-Mode
Voltage Range (Note 4)FCMLLow limit-10V
DELAY Current SourceVCC = 5V, VDELAY = 091011μA
VCC = 3V1.551.731.90DELAY ThresholdVCC = 5V3.13.293.5V
ESD PROTECTIONHuman Body Model±15
IEC1000-4-2 (Air-Gap Discharge)±15ESD Protection
(A, A, B, B, Z, Z)
IEC1000-4-2 (Contact Discharge)±8
DELAYED ALARM OUTPUTMAX3097E/8E toc06
20μs/div
CH 1
CH 2
CH 3
GND
GND
GND
CH1: VA, 5V/div
CH2: VALARMA, 5V/div
CH3: VALARMD, 5V/div
VA = GND, CDELAY = 270pF
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5V, riple RS-422/RS-485Receivers with Fault Detection
Typical Operating Characteristics(Typical values are at VCC= +5V and TA= +25°C.)
10,00010010100010,000
ALARMD OUTPUT DELAY
vs. CAPACITANCEMAX3097E/8Etoc01
CAPACITANCE (pF)
ALARMD OUTPUT DELAY (
VCC = 5V
VCC = 3V
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
MAX3097E/8E toc02
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
VCC = 5.0V
VCC = 3.3V
SUPPLY CURRENT vs.
TEMPERATUREMAX3097E/8E toc03
SUPPLY CURRENT (mA)
TEMPERATURE (°C)
VCC = 5.0V
VCC = 3.3V
NO LOAD
RECEIVER OUTPUT LOW VOLTAGE
vs. OUTPUT CURRENT
MAX3097E/8E toc04
OUTPUT CURRENT (mA)
OUTPUT LOW VOLTAGE (V)
VCC = 5.0V
VCC = 3.3V
RECEIVER OUTPUT HIGH VOLTAGE
vs. OUTPUT CURRENT
MAX3097E/8E toc05
OUTPUT CURRENT (mA)
OUTPUT HIGH VOLTAGE (V)
VCC = 5.0V
VCC = 3.3V
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5Vriple RS-422/RS-485Receivers with Fault DetectionCH 3
CH 2
GNDCH 1
COMMON-MODE VOLTAGE FAULT
(HIGH SIDE)MAX3097E/8E toc07a
2ms/div
CH1: VA + AC(60Hz), 10V/div
CH2: VOUTA, 5V/div
CH3: VALARMA, 5V/div
VCC = 3V
GND
GND
COMMON-MODE VOLTAGE FAULT
(LOW SIDE)MAX3097E/8E toc07b
CH 3
CH 2
GNDCH 1
2ms/div
CH1: VA + AC(60Hz), 10V/div
CH2: VOUTA, 5V/div
CH3: VALARMA, 5V/div
VCC = 3V
GND
GND
Typical Operating Characteristics (continued)(Typical values are at VCC= +5V and TA= +25°C.)
MAX3097E
LOW DIFFERENTIAL INPUT FAULTMAX3097E/8E toc08
CH 2GND
GNDCH 1
100μs/div
CH1: VA, 200mV/div
CH2: VALARMA, 5V/div
VA = GND
SLEW-RATE FAULTMAX3097E/8E toc09
CH 2GND
GNDCH 1
CH1: VA, 5V/div
CH2: VALARMA, 5V/div
SLEW RATE = 0.05V/μs
VA = GND
FAULT-DETECTION RECEIVER DIFFERENTIAL
THRESHOLD VOLTAGE SHIFT vs.
COMMON-MODE VOLTAGE
MAX3097E/8E toc10
COMMON-MODE VOLTAGE (V)
THRESHOLD SHIFT (mV)
MAX3097E
MAX3098E
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5V, riple RS-422/RS-485Receivers with Fault Detection
PINNAMEFUNCTIONANoninverting Receiver A InputAInverting Receiver A InputBNoninverting Receiver B InputBInverting Receiver B InputZNoninverting Receiver Z InputZInverting Receiver Z InputGNDGroundDELAY
Programmable Delay Terminal. Connect a capacitor from DELAY to GND to set the
ALARMD output delay time. To obtain a minimum delay, leave DELAY unconnected. See
Capacitance vs. ALARMD Output Delay in the Typical Operating Characteristics.ALARMD
Delayed Fault Output. This output is the logic OR of ALARMA, ALARMB, and ALARMZ.
Place a capacitor from the DELAY pin to GND to set the delay (see Setting Delay Time). A
high logic level indicates a fault condition on at least one receiver input pair. A low level on
this pin indicates no fault condition is present.OUTZ
Z Receiver Output. If VZ - V Z ≥ +200mV, OUTZ will be high. If VZ - V Z ≤ -200mV, OUTZ will
be low. If Z or Z exceeds the receiver’s input common-mode voltage range, the ALARMZ
output will be high and OUTZ will be indeterminate.ALARMZZ Fault Output. When ALARMZ is high, OUTZ is indeterminate. Tables 1 and 2 show all the
possible states for which an alarm is set.OUTB
B Receiver Output. If VB - V B ≥ +200mV, OUTB will be high. If VB - V B ≤ -200mV, OUTB will
be low. If B or B exceeds the input receiver’s common-mode voltage range, the ALARMB
output will be high and OUTB will be indeterminate.ALARMBB Fault Output. When ALARMB is high, OUTB is indeterminate. Tables 1 and 2 show all the
possible states for which an alarm is set.OUTA
A Receiver Output. If VA - V A ≥ +200mV, OUTA will be high. If VA - V A ≤ -200mV, OUTA will
be low. If A or A exceeds the receiver’s input common-mode voltage range, the ALARMA
output will be high and OUTA will be indeterminate.ALARMAA Fault Output. When ALARMA is high, OUTA is indeterminate. Tables 1 and 2 show all the
possible states for which an alarm is set.VCCPower Supply
Pin Description
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5Vriple RS-422/RS-485Receivers with Fault Detection(FAULT OUTPUT)
ALARMA
ALARMD
CLF
VID
OUTA
Figure 1. Typical Receiver Test Circuit
+3V
VIDOVOV
RISE/FALL TIMES ≤2ns
VCC/2VCC/2
-3V
VOH
VOL
tPHLtPLH
Figure 2. Propagation DelayVIDFDIFL
VCC/2VCC/2
-3.0V
+3.0V
FDIFH
VOH
ALARM OR ALARMD
VOL
tDFHLtDFLH
Figure 3. Fault-Detection Timing
VIN
FCMH
VCC/2VCC/2
FCML
VOH
ALARM OR ALARMD
VOL
tCMFHLtCMFLHtCMFHLtCMFLH
VCC/2VCC/2
Figure 4. Common-Mode Fault Propagation Delay
Test Circuits and Waveforms
Detailed DescriptionThe MAX3097E/MAX3098E feature high-speed, triple
RS-485/RS-422 receivers with fault-detection circuitry
and fault-status outputs. The fault outputs are active
push-pull, requiring no pull-up resistors. The fault cir-
cuitry includes a capacitor-programmable delayed
FAULT_ output to ensure that there are no erroneous
fault conditions even at slow edge rates (see Delayed
Fault Output). The receivers operate at data rates up to
32Mbps.
The MAX3097E/MAX3098E are designed for motor-
shaft encoders with standard A, B, and Z outputs (see
Using the MAX3097E/MAX3098E as Shaft Encoder
Receivers). The devices provide an alarm for open-cir-
cuit conditions, short-circuit conditions, data nearing
the minimum differential threshold conditions, data
below the minimum threshold conditions, and receiver
inputs outside the input common-mode range. Tables 1
and 2 are functional tables for each receiver.
MAX3097E/MAX3098E
±15kV ESD-Protected, 32Mbps, 3V/5V, riple RS-422/RS-485Receivers with Fault Detection
Note 1:ALARMD indicates fault for any receiver.
Note 2:Receiver output may oscillate with this differential input condition.
Note 3:See Applications Informationfor conditions leading to input range fault condition.
X = Don’t care
INPUTSOUTPUTS
VID
(DIFFERENTIAL
INPUT VOLTAGE)
COMMON-MODE
VOLTAGEOUT_ALARM_
ALARMD
t ≥ DELAY
(NOTE 1)
FAULT CONDITION≥0.475V100Normal Operation
<0.475V and ≥0.275V1IndeterminateIndeterminateIndeterminate
<0.275V and ≥0.2V111Low Input Differential Voltage
≤0.2V and ≥-0.2VIndeterminate
(Note 2)11Low Input Differential Voltage
≤-0.2V and >-0.275V011Low Input Differential Voltage
≤-0.275V and
>-0.475V0IndeterminateIndeterminate
≤-0.475V
≤13.2V and ≥-10V0
Indeterminate<-10V or >+13.2VIndeterminate
(Note 3)11Outside Common-Mode
Voltage Range
INPUTSOUTPUTS
VID
(DIFFERENTIAL
INPUT VOLTAGE)
COMMON-MODE
VOLTAGEOUT_ALARM_
ALARMD
t ≥ DELAY
(NOTE 1)
FAULT CONDITION≥0.2V100Normal Operation
<0.2V and ≥0.12VIndeterminateIndeterminateIndeterminateIndeterminate
<0.12V and ≥ - 0.12VIndeterminate
(Note 2)11Low Input Differential Voltage
≤-0.12V and ≥ -0.2VIndeterminateIndeterminateIndeterminateIndeterminate
≤-0.2V
≤13.2V and ≥-
10V00Normal Operation<-10V or
>+13.2V
Indeterminate
(Note 3)11Outside Common-Mode Voltage
Range
Table 1. MAX3097E Alarm Function Table (Each Receiver)
Table 2. MAX3098EA Alarm Function Table (Each Receiver)
Note 1:ALARMD indicates fault for any receiver.
Note 2:Receiver output may oscillate with this differential input condition.
Note 3:See Applications Informationfor conditions leading to input range fault condition.
X = Don’t care; for B-grade functionality, replace VIDinput values in Table 2 with B-grade parameters from Electrical Characteristics.
