ADM3082AR ,High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD ProtectionCHARACTERISTICS(V = +5V ±5%, T = T to T , unless otherwise noted. Typical values are at V = +5V and ..
ADM3082JR ,High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD ProtectionApplicationscharge (ESD) protection and high receiver input imped-ance (1/8 unit load), allowing up ..
ADM3085AR ,High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD ProtectionSPECIFICATIONS (continued)DC ELECTRICAL
ADM3085JR ,High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD ProtectionAPPLICATIONSThe ADM3085 offers a higher slew rate allowing data ratesEnhanced Replacement for Indus ..
ADM3088AR ,High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD ProtectionGENERAL DESCRIPTIONEnhanced Slew Rate Limiting for Error-Free Data The ADM3082/ADM3085/ADM3088 are ..
ADM3088JR ,High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD ProtectionPRELIMINARY TECHNICAL DATAHigh-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate ..
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ADM3082AR-ADM3082JR-ADM3085AR-ADM3085JR-ADM3088AR-ADM3088JR
High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and 5kV ESD Protection
PRELIMINARY TECHNICAL DATA
High-Speed (10Mbps), Fail-Safe, RS-485/RS-422
Transceivers with Slew-Rate-Limiting
and ±15kV ESD Protection
GENERAL DESCRIPTIONThe ADM3082/ADM3085/ADM3088 are high-speed
RS-485/RS-422 transceivers consisting of one driver and one
receiver per package. The devices feature fail-safe operation,
ensuring a logic-high receiver output when the receiver in-
puts are open-circuit or short-circuit. This guarantees that
the receiver output will be high if all the transmitters on a
terminated bus are disabled (high-impedance).
The ADM3082 has a slew-rate limited driver to minimize
electromagnetic interference (EMI) and reduce reflections
caused by incorrectly terminated cables. This allows error-
free transmission at data rates up to 115kbps.
The ADM3085 offers a higher slew rate allowing data rates
up to 500kbps, while the ADM3088 has a driver whose slew
rate is not limited, allowing data rates up to 10Mbps.
All devices in the family feature ±15kV electrostatic dis-
charge (ESD) protection and high receiver input imped-
ance (1/8 unit load), allowing up to 256 transceivers on
the bus. The devices have low current drain of 375μA un-
loaded, or fully loaded with the drivers disabled, and fea-
ture an ultra-low power (1nA) shutdown mode.
FEATURES
Enhanced Slew Rate Limiting for Error-Free Data
Transmission
Fail-Safe Receiver Operation while Maintaining
EIA/TIA-485 compatibility
Low-Current (1nA) Shutdown Mode
High Input Impedance — Up to 256 Transceivers on Bus
±15kV ESD Protection (Human Body Model) on
RS-485 I/O pins
Pin-Compatible with Industry Standard 75176
APPLICATIONS
Enhanced Replacement for Industry-Standard Parts
EMI-Sensitive Systems
Level Translation
LANs for Industrial Control Applications
FUNCTIONAL BLOCK DIAGRAM
VCC
GND
ADM3082/ADM3085/ADM3088
ADM3082/ADM3085/ADM3088
PRELIMINARY TECHNICAL DATA
ADM3082/ADM3085/ADM3088 SPECIFICATIONS
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
DRIVERDifferential Driver Output,VOD2
Change-in-Magnitude of Differential
Driver Common-Mode
Input High Voltage,VIH1
Input Current (A and B), IIN4
Full Duplex, IO
Output Current
PRELIMINARY TECHNICAL DATA
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
RECEIVER
SUPPLY CURRENT
NOTESAll currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground unless otherwise noted.DDO and DVCC are the changes in VOD and VOC, respectively, when the DI input changes state.Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during current limiting.
ADM3082/ADM3085/ADM3088
PRELIMINARY TECHNICAL DATA
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
SWITCHING CHARACTERISTICS—ADM3082
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PRELIMINARY TECHNICAL DATA
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
SWITCHING CHARACTERISTICS—ADM3085
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)Driver Enable to Output Low, tDZL
Driver Disable Time from Low, tDLZ
Driver Disable Time from High, tDHZ
Receiver Input to Output, tRPLH, tRPHL
Receiver Enable to Output High, tRZH
Receiver Disable Time from Low, tRLZ
Receiver Disable Time from High, tRHZ
Driver Enable from Shutdown
Driver Enable from Shutdown
Receiver Enable from Shutdown
Receiver Enable from Shutdown
ADM3082/ADM3085/ADM3088
PRELIMINARY TECHNICAL DATA
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
SWITCHING CHARACTERISTICS—ADM3088
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
NOTESThe device is put into shutdown by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shut-
PRELIMINARY TECHNICAL DATA
ADM3082/ADM3085/ADM3088 TEST CIRCUITS AND TIMING
VOCFigure 1. Driver DC Load Test Circuit
Figure 2. Test Load for Driver Timing Tests
V0/2
VDIFF
-V0
tSKEW = |tDPLH-tDPHL|
VDIFF = VY - VZFigure 3. Driver Propagation Delays
-1V
VOH
VOL
tRPLHFigure 4. Receiver Propagation Delays
VCCOUTPUT
UNDER
TESTFigure 5. Test Load for Driver Enable/Disable Time Test
Y, Z
Y, Z
VOLVOL+0.5V
VOH-0.5V
VOLFigure 6. Driver Enable and Disable Times
TEST
POINT
VCCFigure 7. Test Load for Receiver Enable/Disable Time Test
VCCFigure 8. Receiver Enable and Disable Delay Times
