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PDF MAX3444EAPA Data sheet ( Hoja de datos )
| Número de pieza | MAX3444EAPA | |
| Descripción | 15kV ESD-Protected / 60V Fault-Protected / 10Mbps / Fail-Safe RS-485/J1708 Transceivers | |
| Fabricantes | Maxim Integrated | |
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MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
General Description
The MAX3440E–MAX3444E fault-protected RS-485 and
J1708 transceivers feature ±60V protection from signal
faults on communication bus lines. Each device contains
one differential line driver with three-state output and one
differential line receiver with three-state input. The 1/4-unit-
load receiver input impedance allows up to 128 transceiv-
ers on a single bus. The devices operate from a 5V supply
at data rates of up to 10Mbps. True fail-safe inputs guar-
antee a logic-high receiver output when the receiver inputs
are open, shorted, or connected to an idle data line.
Hot-swap circuitry eliminates false transitions on the data
bus during circuit initialization or connection to a live
backplane. Short-circuit current-limiting and thermal shut-
down circuitry protect the driver against excessive power
dissipation, and on-chip ±15kV ESD protection eliminates
costly external protection devices.
The MAX3440E–MAX3444E are available in 8-pin SO
and PDIP packages and are specified over industrial and
automotive temperature ranges.
Applications
●● RS-422/RS-485 Communications
●● Industrial Networks
●● Telecommunications Systems
●● HVAC Controls
Features
●● ±15kV ESD Protection
●● ±60V Fault Protection
●● Guaranteed 10Mbps Data Rate
(MAX3441E/MAX3443E)
●● Hot Swappable for Telecom Applications
●● True Fail-Safe Receiver Inputs
●● Enhanced Slew-Rate-Limiting Facilitates
Error-Free Data Transmission
(MAX3440E/MAX3442E/MAX3444E)
●● Allow Up to 128 Transceivers on the Bus
●● -7V to +12V Common-Mode Input Range
●● Automotive Temperature Range (-40°C to +125°C)
●● Industry-Standard Pinout
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3440EESA+
-40°C to +85°C 8 SO
MAX3440EEPA+
-40°C to +85°C 8 PDIP
MAX3440EASA+
-40°C to +125°C 8 SO
MAX3440EAPA+
-40°C to +125°C 8 PDIP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Selector Guide
PART
TYPE
MAX3440E
MAX3441E
MAX3442E
MAX3443E
MAX3444E
RS-485
RS-485
RS-485
RS-485
J1708
DATA RATE
(Mbps)
0.25
2.5 to 10
0.25
2.5 to 10
0.25
LOW-POWER
SHUTDOWN
No
No
Yes
Yes
Yes
RECEIVER/DRIVER
ENABLE
Yes
Yes
Yes
Yes
Yes
TRANSCEIVERS
ON BUS
128
128
128
128
128
HOT SWAP
Yes
Yes
Yes
Yes
Yes (only RE)
Pin Configurations and Typical Operating Circuits
TOP VIEW
+
FAULT 1
RO 2
R
DE/RE 3
DI 4
D
+
8 VCC FAULT 1
7B
RO 2
R
6 A DE/RE 3
5 GND DI 4
D
8 VCC
7B
Rt
6
A
5 GND
MAX3440E
MAX3441E
DIP/SO
DIP/SO
Pin Configurations and Typical Operating Circuits continued at end of data sheet.
B
Rt
A
DE/RE
D DI
R
FAULT
RO
19-2666; Rev 3; 4/14
1 page  
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
Switching Characteristics (MAX3441E/MAX3443E)
(VCC = +4.75V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Driver Propagation Delay
Driver Differential Propagation Delay
Driver Differential Output
Transition Time
tPLHA,
tPLHB
tDPLH,
tDPHL
tLH,tHL
Figure 3, RL = 27Ω, CL = 50pF
Figure 4, RL = 54Ω, CL = 50pF
Figure 4, RL = 54Ω, CL = 50pF
60
60
25
UNITS
ns
ns
ns
Driver Output Skew
tSKEWAB,
tSKEWBA
RL = 54Ω, CL = 50pF,
tSKEWAB = |tPLHA - tPHLB|,
tSKEWBA = |tPLHB - tPHLA|
10 ns
Differential Driver Output Skew
tDSKEW
RL = 54Ω, CL = 50pF,
tDSKEW = |tDPLH - tDPHL|
10 ns
Maximum Data Rate
Driver Enable Time to Output High
Driver Disable Time from Output High
Driver Enable Time from Shutdown to
Output High
fMAX
tPDZH
tPDHZ
tPDHS
Figure 5, RL = 500Ω, CL = 50pF
Figure 5, RL = 500Ω, CL = 50pF
Figure 5, RL = 500Ω, CL = 50pF (MAX3443E)
10
1200
1200
Mbps
ns
ns
4.2 µs
Driver Enable Time to Output Low
Driver Disable Time from Output Low
Driver Enable Time from Shutdown to
Output Low
tPDZL
tPDLZ
tPDLS
Figure 6, RL = 500Ω, CL = 50pF
Figure 6, RL = 500Ω, CL = 50pF
Figure 6, RL = 500Ω, CL = 50pF (MAX3443E)
1200
1200
4.2
ns
ns
µs
Driver Time to Shutdown
Receiver Propagation Delay
Receiver Output Skew
Receiver Enable Time to Output High
Receiver Disable Time from Output
High
tSHDN
tRPLH,
tRPHL
tRSKEW
tRPZH
Figure 6, RL = 500Ω, CL = 50pF (MAX3443E)
Figure 7, CL = 20pF, VID = 2V, VCM = 0V
CL = 20pF, tRSKEW = |tRPLH - tRPHL|
Figure 8, RL = 1kΩ, CL = 20pF
tRPHZ Figure 8, RL = 1kΩ, CL = 20pF
800 ns
85 ns
15 ns
400 ns
400 ns
Receiver Wake Time from Shutdown
Receiver Enable Wake Time from
Shutdown
tRPWAKE Figure 8, RL = 1kΩ, CL= 20pF (MAX3443E)
tRPSH Figure 8, RL = 1kΩ, CL = 20pF
4.2 µs
400 ns
Receiver Disable Time from Output Low tRPLZ Figure 8, RL = 1kΩ, CL= 20pF
400 ns
Receiver Time to Shutdown
tSHDN RL = 500Ω, CL= 50pF (MAX3443E)
800 ns
Note 2: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 3: The short-circuit output current applies to peak current just before foldback current limiting; the short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
Function Tables
Table 1. MAX3440E/MAX3441E Fault Table
INPUTS
OUTPUTS
A-B
VID DIFFERENTIAL
INPUT VOLTAGE
COMMON-MODE
VOLTAGE
RO
FAULT
CONDITIONED
BY DELAY
≥0.45V
10
<0.45V and ≥0.27V
1 Indeterminate
<0.27V and ≥-0.05V
11
≤-0.05V and ≥-0.2V
≤12V and ≥-7V
Indeterminate
(Note 1)
1
≤-0.2V and >-0.27V
01
≤-0.27V and >-0.45V
0 Indeterminate
≤-0.45V
00
X
X = Don’t care.
<-7V or >+12V
Indeterminate
1
Note 1: Receiver output may oscillate with this differential input condition.
FAULT CONDITION
Normal operation
Indeterminate
Low-input differential voltage
Low-input differential voltage
Low-input differential voltage
Indeterminate
Outside common-mode voltage range
Table 2. MAX3440E/MAX3441E
(RS-485/RS-422)
INPUTS
DE/RE
0
1
1
X = Don’t care.
TRANSMITTING
OUTPUTS
DI A
B
X
High-Z
High-Z
001
110
Table 4. MAX3444E (J1708) Application
INPUTS
TXD
DE
01
11
00
10
X = Don’t care.
TRANSMITTING
OUTPUTS
AB
High-Z
High-Z
High-Z
High-Z
01
High-Z
High-Z
CONDITIONS
—
—
—
Dominant state
Recessive state
Table 3. MAX3442E/MAX3443E
(RS-485/RS-422)
TRANSMITTING
INPUTS
OUTPUTS
RE DE DI A B
0
0
X
High-Z
High-Z
01001
01110
1 0 X Shutdown Shutdown
11001
11110
X = Don’t care.
Table 5. MAX3440E/MAX3441E
(RS-485/RS-422)
RECEIVING
INPUTS
OUTPUTS
DE/RE
(A - B)
RO
0 ≥-0.05V
1
0 ≤-0.2V
0
0 Open/shorted
1
1
X = Don’t care.
X
High-Z
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX3444EAPA.PDF ] | |
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