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PDF MAX3082CSA Data sheet ( Hoja de datos )
| Número de pieza | MAX3082CSA | |
| Descripción | Fail-Safe / High-Speed 10Mbps / Slew-Rate-Limited RS-485/RS-422 Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1138; Rev 1; 12/97
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
General Description
The MAX3080–MAX3089 high-speed transceivers for
RS-485/RS-422 communication contain one driver and
one receiver. These devices feature fail-safe circuitry,
which guarantees a logic-high receiver output when the
receiver inputs are open or shorted. This means that
the receiver output will be a logic high if all transmitters
on a terminated bus are disabled (high impedance).
The MAX3080/MAX3081/MAX3082 feature reduced
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 115kbps. The
MAX3083/MAX3084/MAX3085 offer higher driver out-
put slew-rate limits, allowing transmit speeds up to
500kbps. The MAX3086/MAX3087/MAX3088’s driver
slew rates are not limited, making transmit speeds up
to 10Mbps possible. The MAX3089’s slew rate is
selectable between 115kbps, 500kbps, and 10Mbps
by driving a selector pin with a single three-state
driver.
These transceivers typically draw 375µA of supply
current when unloaded, or when fully loaded with the
drivers disabled.
All devices have a 1/8-unit-load receiver input imped-
ance that allows up to 256 transceivers on the bus. The
MAX3082/MAX3085/MAX3088 are intended for half-
duplex communications, while the MAX3080/MAX3081/
MAX3083/MAX3084/MAX3086/MAX3087 are intended
for full-duplex communications. The MAX3089 is selec-
table between half-duplex and full-duplex operation. It
also features independently programmable receiver
and transmitter output phase via separate pins.
Features
o True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
o Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
(MAX3080–MAX3085/MAX3089)
o 1nA Low-Current Shutdown Mode (except
MAX3081/MAX3084/MAX3087)
o Pin-Selectable Full/Half-Duplex Operation
(MAX3089)
o Phase Controls to Correct for Twisted-Pair
Reversal (MAX3089)
o Allow Up to 256 Transceivers on the Bus
Applications
RS-422/RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Ordering Information
PART
MAX3080CPD
MAX3080CSD
MAX3080EPD
MAX3080ESD
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
Ordering Information continued on last page.
Selection Table
Part
Half/Full
Duplex
Data
Rate
(Mbps)
Slew
Rate
Limited
Low- Receiver/ Quiescent Transceivers
Power
Driver Current
On
Shutdown Enable
(µA)
Bus
MAX3080
Full
0.115
Yes
Yes Yes 375
256
MAX3081
Full
0.115
Yes
No
No 375
256
MAX3082
Half
0.115
Yes
Yes Yes 375
256
MAX3083
Full
0.5
Yes Yes Yes 375
256
MAX3084
Full
0.5
Yes
No
No 375
256
MAX3085
Half
0.5
Yes Yes Yes 375
256
MAX3086
Full
10
No Yes Yes 375 256
MAX3087
Full
10
No
No No 375 256
MAX3088
Half
10
No Yes Yes 375 256
MAX3089 Selectable Selectable Selectable
Yes
Yes
375
256
*Pin-compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.
Pin
Count
14
8
8
14
8
8
14
8
8
14
Industry-
Standard
Pinout
75180
75179
75176
75180
75179
75176
75180
75179
75176
75180*
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3083–MAX3085, and MAX3089 with SRL = VCC
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Driver Input to Output
Driver Output Skew
| tDPLH - tDPHL |
SYMBOL
tDPLH
tDPHL
tDSKEW
Driver Rise or Fall Time
tDR, tDF
Maximum Data Rate
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
| tRPLH - tRPHL | Differential
Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from
High
fMAX
tDZH
tDZL
tDLZ
tDHZ
tRPLH,
tRPHL
tRSKD
tRZL
tRZH
tRLZ
tRHZ
CONDITIONS
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 8 and 10, CL = 100pF, S2 closed
Figures 8 and 10, CL = 100pF, S1 closed
Figures 8 and 10, CL = 15pF, S1 closed
Figures 8 and 10, CL = 15pF, S2 closed
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
Figures 6 and 12, CL = 100pF, S1 closed
Figures 6 and 12, CL = 100pF, S2 closed
Figures 6 and 12, CL = 100pF, S1 closed
Figures 6 and 12, CL = 100pF, S2 closed
MIN TYP MAX UNITS
250 720 1000
ns
250 720 1000
-3 ±100 ns
200 530 750
ns
500 kbps
2500 ns
2500 ns
100 ns
100 ns
127 200
ns
3 ±30 ns
20 50 ns
20 50 ns
20 50 ns
20 50 ns
Time to Shutdown
Driver Enable from Shutdown to
Output High
tSHDN
tDZH(SHDN)
(Note 5)
Figures 8 and 10, CL = 15pF, S2 closed
50 200 600 ns
4500 ns
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
Figures 8 and 10, CL = 15pF, S1 closed
4500 ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
Figures 6 and 12, CL = 100pF, S2 closed
3500 ns
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
Figures 6 and 12, CL = 100pF, S1 closed
3500 ns
_______________________________________________________________________________________ 5
5 Page 
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
Pin Description (continued)
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
MAX3089
NAME
FULL-DUPLEX
DEVICES
HALF- FULL- HALF-
DUPLEX DUPLEX DUPLEX
DEVICES MODE MODE
FUNCTION
12 8 — 12 — A Noninverting Receiver Input
— — — — 12 A Receiver Input Resistors*
— — 6 — — A Noninverting Receiver Input and Noninverting Driver Output
Receiver Phase. Connect RXP to GND, or leave unconnected for
— — — 13 13 RXP normal transmitter phase/polarity. Connect to VCC to invert the
receiver phase/polarity.
14 1
8 14 14 VCC Positive Supply; 4.75V ≤ VCC ≤ 5.25V
1, 8, 13
—
—
—
— N.C. Not Connected. Not internally connected.
*(MAX3089 only.) In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) will still
have a 1/8-unit load, but are not connected to the receiver.
MAX3080/MAX3083/MAX3086
TRANSMITTING
INPUTS
RE DE DI
OUTPUTS
ZY
X1101
X1010
0 0 X High-Z High-Z
10X
Shutdown
RECEIVING
INPUTS
OUTPUT
RE DE A-B RO
0 X ≥ -0.05V 1
0 X ≤ -0.2V 0
0 X Open/shorted 1
1 1 X High-Z
1 0 X Shutdown
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
Function Tables
MAX3081/MAX3084/MAX3087
TRANSMITTING
INPUT
OUTPUTS
DI Z
10
01
Y
1
0
INPUTS
A-B
≥ -0.05V
≤ -0.2V
Open/shorted
RECEIVING
OUTPUT
RO
1
0
1
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX3082CSA.PDF ] | |
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