MAX3074E Datasheet PDF - Maxim Integrated
| Part Number | MAX3074E | |
| Description | RS-485/RS-422 Transceivers | |
| Manufacturers | Maxim Integrated | |
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
General Description
The MAX3070E–MAX3079E 3.3V, ±15kV ESD-protected,
RS-485/RS-422 transceivers feature one driver and one
receiver. These devices include fail-safe circuitry, guaranteeing
a logic-high receiver output when receiver inputs are open
or shorted. The receiver outputs a logic-high if all transmitters
on a terminated bus are disabled (high impedance). The
devices include a hot-swap capability to eliminate false
transitions on the bus during power-up or hot insertion.
The MAX3070E/MAX3071E/MAX3072E feature reduced
slew-rate drivers that minimize EMI and reduce reflections
caused by improperly terminated cables, allowing error-
free data transmission up to 250kbps. The MAX3073E/
MAX3074E/MAX3075E also feature slew-rate-limited
drivers but allow transmit speeds up to 500kbps. The
MAX3076E/MAX3077E/MAX3078E driver slew rates are
not limited, making transmit speeds up to 16Mbps possible.
The MAX3079E slew rate is pin-selectable for 250kbps,
500kbps, and 16Mbps.
The MAX3072E/MAX3075E/MAX3078E are intended
for half-duplex communications, and the MAX3070E/
MAX3071E/MAX3073E/MAX3074E/MAX3076E/
MAX3077E are intended for full-duplex communications.
The MAX3079E is selectable for half-duplex or full-duplex
operation. It also features independently programmable
receiver and transmitter output phase through separate
pins.
The MAX3070E–MAX3079E transceivers draw 800μA
of supply current when unloaded, or when fully loaded
with the drivers disabled. All devices have a 1/8-unit load
receiver input impedance, allowing up to 256 transceivers
on the bus.
Applications
●● Lighting Systems
●● Industrial Control
●● Telecom
●● Security Systems
●● Instrumentation
Benefits and Features
●● Protection for Robust Performance
• ±15kV Human Body Model ESD on I/O Pins
• True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
• Enhanced Slew-Rate-Limiting Facilitates Error-
Free Data Transmission (MAX3070E-MAX3075E/
MAX3079E)
• Hot-Swap Input Structure on DE and RE
●● Flexible Feature Set for Ease of Design
• Pin-Selectable Full/Half-Duplex Operation
(MAX3079E)
• Phase Controls to Correct for Twisted-Pair
Reversal (MAX3079E)
• Allows up to 256 Transceivers on the Bus
• Available in Industry-Standard SO and DIP packages
●● 10µA Shutdown Current Mode for Power Savings
(Except MAX3071E/MAX3074E/MAX3077E)
Ordering Information at end of data sheet.
Selector Guide, Pin Configurations, and Typical Operating
Circuits appear at end of data sheet.
19-2668; Rev 4; 1/16
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Driver Switching Characteristics
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = VCC (500kbps)
(VCC = 3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.)
PARAMETER
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
SYMBOL
tDPLH
tDPHL
CONDITIONS
CL = 50pF, RL = 54Ω, Figures 2 and 3
tDR , tDF CL = 50pF, RL = 54Ω, Figures 2 and 3
MIN TYP MAX
180 800
180 800
200 800
Differential Driver Output Skew
|tDPLH - tDPHL|
Maximum Data Rate
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Driver Enable from Shutdown to
Output High
tDSKEW CL = 50pF, RL = 54Ω, Figures 2 and 3
tDZH
tDZL
tDLZ
tDHZ
Figure 4
Figure 5
Figure 5
Figure 4
tDZH(SHDN) Figure 4
500
100
2500
2500
100
100
4500
Driver Enable from Shutdown to
Output Low
Time to Shutdown
tDZL(SHDN) Figure 5
tSHDN
4500
50 200 600
UNITS
ns
ns
ns
kbps
ns
ns
ns
ns
ns
ns
ns
Receiver Switching Characteristics
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = VCC (500kbps)
(VCC = 3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.)
PARAMETER
Receiver Propagation Delay
Receiver Output Skew
|tRPLH - tRPHL|
Maximum Data Rate
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
Receiver Enable from Shutdown
to Output High
SYMBOL
tRPLH
tRPHL
CONDITIONS
CL = 15pF, Figures 6 and 7
tRSKEW CL = 15pF, Figures 6 and 7
tRZL
tRZH
tRLZ
tRHZ
Figure 8
Figure 8
Figure 8
Figure 8
tRZH(SHDN) Figure 8
MIN TYP MAX
200
200
30
500
50
50
50
50
4000
Receiver Enable from Shutdown
to Output Low
Time to Shutdown
tRZL(SHDN) Figure 8
tSHDN
4000
50 200 600
UNITS
ns
ns
kbps
ns
ns
ns
ns
ns
ns
ns
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| Information | Total 23 Pages | |
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| Download | [ MAX3074E.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| MAX3074E | The function is RS-485/RS-422 Transceivers. Maxim Integrated | |
| MAX3074EAPA | The function is +3.3V / 15kV ESD-Protected / Fail-Safe / Hot-Swap / RS-485/RS-422 Transceivers. Maxim Integrated | |
| MAX3074EASA | The function is +3.3V / 15kV ESD-Protected / Fail-Safe / Hot-Swap / RS-485/RS-422 Transceivers. Maxim Integrated | |
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