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PDF MAX14841E Data sheet ( Hoja de datos )
| Número de pieza | MAX14841E | |
| Descripción | RS-485 Half-Duplex Transceivers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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MAX14840E/MAX14841E 40Mbps, +3.3V, RS-485 Half-Duplex Transceivers
General Description
The MAX14840E/MAX14841E are +3.3V ESD-protected
transceivers intended for half-duplex RS-485 communica-
tion up to 40Mbps. These transceivers are optimized for
high speeds over extended cable runs while maximizing
tolerance to noise.
The MAX14840E features symmetrical fail-safe and larg-
er receiver hysteresis, providing improved noise rejection
and improved recovered signals in high-speed and long
cable applications. The MAX14841E has true fail-safe
receiver inputs guaranteeing a logic-high receiver output
when inputs are shorted or open.
The MAX14840E/MAX14841E are available in 8-pin SO
and small, 8-pin (3mm x 3mm) TDFN-EP packages. Both
devices operate over the -40NC to +125NC temperature
range.
Applications
●● Motion Controllers
●● Fieldbus Networks
●● Industrial Control Systems
●● Backplane Buses
●● HVAC Networks
Ordering Information/Selector Guide appears at end of data
sheet.
Benefits and Features
●● High ESD Protection Provides Increases Equipment
Uptime
• ±35kV Human Body Model (HBM) per JEDEC
JS-001-2012
• ±20kV Air Gap Discharge per IEC 61000-4-2
• ±12kV Contact Discharge per IEC 61000-4-2
●● Integrated Features Increases Robustness
• Large 170mV Receiver Hysteresis (MAX14840) for
High Receiver Noise Tolerance
• True Fail Safe Receiver Input (MAX14841E) Keeps
Receiver Output Logic-High Upon Shorts and
Open On Receiver Input
• Thermal Self-Protection Shutdown at 160°C
Junction Temperature
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range/-40°C to +150°C Junction
Temperature Range
• Hot Swap Capability Eliminates False Transition
During Power-Up or Hot Insertion
●● Low Current Reduces Power Requirements
• 10µA (max) Shutdown Current
• 1.5mA (typ) Supply Current
• 3.3V Supply Voltage
●● Available in Industry Standard 8-Pin SO or
Space-Saving 8-Pin TDFN-EP (3mm x 3mm) Packages
Functional Diagram
VCC
MAX14840E
MAX14841E
RO R
RE
SHUTDOWN
DE
DI D
B
A
GND
19-5131; Rev 2; 7/15
1 page  
MAX14840E/MAX14841E 40Mbps, +3.3V, RS-485 Half-Duplex Transceivers
Test and Timing Diagrams
A
VOD
B
Figure 1. Driver DC Test Load
RL
2
RL
2
VOC
VCC
DE
DI A
B
VOD
RL CL
Figure 2. Driver Timing Test Circuit
VCC f = 1MHz, tLH = 3ns, tHL = 3ns
1.5V 1.5V
0
tDPLH
B
tDPHL
A
VO
VOD 0
-VO
VOD
90%
10%
tLH
Figure 3. Driver Propagation Delays
VOD = [VA - VB]
90%
tDSKEW = tDPLH - tDPHL
tHL
10%
GND OR VCC DI D
A
B
DE
S1
CL
50pF
GENERATOR
50I
OUT
RL = 110I
DE
OUT
tDZH, tDZH(SHDN)
1.5V
1.5V
0.25V
tDHZ
VCC
0
VOH
0
Figure 4. Driver Enable and Disable Times (tDZH, tDHZ)
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX14840E/MAX14841E 40Mbps, +3.3V, RS-485 Half-Duplex Transceivers
Function Table
TRANSMITTING
INPUTS
RE DE DI
X11
X10
00X
10X
RECEIVING (MAX14840E)
INPUTS
RE DE A-B
0 X R 200mV
0 X P -200mV
0 X Open/Shorted
11X
10X
RECEIVING (MAX14841E)
INPUTS
RE DE A-B
0 X R -10mV
0 X P -200mV
0 X Open/Shorted
11X
10X
X = Don’t care.
Note: Shutdown mode, driver, and receiver outputs are in high impedance.
OUTPUTS
BA
01
10
High Impedance
High Impedance
Shutdown (see note)
OUTPUTS
RO
1
0
Previous State
High Impedance
Shutdown (see note)
OUTPUTS
RO
1
0
1
High Impedance
Shutdown (see note)
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX14841E.PDF ] | |
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