MAX3291ESD ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationELECTRICAL CHARACTERISTICS(Typical Operating Circuit, V = +5V ±5%, R = 0 (MAX3292), V = V (MAX3292) ..
MAX3291ESD+ ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationGeneral Description ________
MAX3292CSD ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationFeaturesThe MAX3291/MAX3292 high-speed RS-485/RS-422' Preemphasis Increases the Distance and Datatr ..
MAX3292CSD+ ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationApplicationsMAX3291ESD -40°C to +85°C 14 SOLong-Distance, High-Speed RS-485/RS-422MAX3291EPD -40°C ..
MAX3292ESD ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationELECTRICAL CHARACTERISTICS(Typical Operating Circuit, V = +5V ±5%, R = 0 (MAX3292), V = V (MAX3292) ..
MAX3292ESD+ ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationELECTRICAL CHARACTERISTICS(Typical Operating Circuit, V = +5V ±5%, R = 0 (MAX3292), V = V (MAX3292) ..
MAX6950EEE+ ,Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display DriversApplicationsMAX6950EEE -40°C to +85°C 16 QSOP-EP*Set-Top BoxesMAX6951CEE 0°C to +70°C 16 ..
MAX6951CEE ,Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display DriversFeaturesThe MAX6950/MAX6951 are compact common-cath-
MAX3291EPD-MAX3291ESD
RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication19-1405; Rev 1; 4/99
________________General DescriptionThe MAX3291/MAX3292 high-speed RS-485/RS-422
transceivers feature driver preemphasis circuitry, which
extends the distance and increases the data rate of reli-
able communication by reducing intersymbol interfer-
ence (ISI) caused by long cables. The MAX3291 is
programmable for data rates of 5Mbps to 10Mbps,
while the MAX3292 is programmable for data rates up
to 10Mbps by using a single external resistor.
The MAX3291/MAX3292 are full-duplex devices that
operate from a single +5V supply and offer a low-cur-
rent shutdown mode that reduces supply current to
100nA. They feature driver output short-circuit current
limiting and a fail-safe receiver input that guarantees a
logic-high output if the input is open circuit. A 1/4-unit-
load receiver input impedance allows up to 128 trans-
ceivers on the bus.
________________________ApplicationsLong-Distance, High-Speed RS-485/RS-422
Communications
Telecommunications
Industrial-Control Local Area Networks
____________________________FeaturesPreemphasis Increases the Distance and Data
Rate of Reliable RS-485/RS-422 CommunicationData Rate
Optimized for 5Mbps to 10Mbps (MAX3291)
Programmable up to 10Mbps (MAX3292)100nA Low-Current Shutdown ModeAllow Up to 128 Transceivers on the Bus-7V to +12V Common-Mode Input Voltage RangePin-Compatible with ’75180, MAX489, MAX491
MAX3080, MAX3083, MAX3086, MAX1482
Typical Operating Circuit and Functional Diagram
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC= VCCD(MAX3292), TA= TMINto TMAX, unless otherwise
noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)
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, VCCD) .................................................+6V
Control Input Voltage (RE, DE, PEE,
PSET, DI).................................................-0.3V to (VCC+ 0.3V)
Driver Output Voltage (Y, Z)................................-7.5V to +12.5V
Receiver Input Voltage (A, B)..............................-7.5V to +12.5V
Receiver Output Voltage (RO)....................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
14-Pin SO (derate 8.7mW/°C above +70°C).................695mW
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C)..800mW
Operating Temperature Ranges
MAX329_C_ D......................................................0°C to +70°C
MAX329_E_ D...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
DC ELECTRICAL CHARACTERISTICS (continued)(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC = VCCD(MAX3292), TA= TMINto TMAX, unless otherwise
noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC= VCCD(MAX3292), TA= +25°C, unless otherwise noted.
Typical values are at VCC= +5V and TA= +25°C.)
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
SWITCHING CHARACTERISTICS (continued)(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC= VCCD(MAX3292), TA= +25°C, unless otherwise noted.
Typical values are at VCC= +5V and TA= +25°C.)
Note 1:All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground unless otherwise noted.
Note 2:Guaranteed by design.
Note 3:DPER is defined as (VODP / VOD).
Note 4:ΔVODPand ΔVOCare the changes in VDDand VOC, respectively, when the DI input changes. This specification reflects
constant operating conditions. When operating conditions shift, the maximum value may be momentarily exceeded.
Note 5:ΔVODPand ΔVOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 6:Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
Note 7:Shutdown is enabled by bringing REhigh and DE low. If the enable inputs are in this state for less than 50ns, the device is
guaranteed not to enter shutdown. If the enable inputs are in this state for at least 500ns, the device is guaranteed to have
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
__________________________________________Typical Operating Characteristics(VCC= +5V, TA= +25°C, unless otherwise noted.)
Note A:Dotted line represents region in which preemphasis may not work in systems with excessive power-supply noise. See
Preemphasis at Low Data Rates.
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
____________________________________Typical Operating Characteristics (continued)(VCC= +5V, TA= +25°C, unless otherwise noted.)
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
Pin DescriptionFigure 1. Driver DC Test Load
Figure 2. Driver or Receiver Enable/Disable Timing Test Load
MAX3291/MAX3292
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance CommunicationFigure 3. Driver Timing Test CircuitFigure 4. Shutdown Timing Diagram
Figure 5. Driver Propagation DelaysFigure 6. Driver Enable and Disable Times
Figure 7. Receiver Propagation DelaysFigure 8. Receiver Enable and Disable Times
