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PDF LTC2858-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC2858-1 | |
| Descripción | 20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 20Mbps or Low EMI 250kbps Maximum Data Rate
■ No Damage or Latchup to ESD: ±15kV HBM
■ High Input Impedance Supports 256 Nodes
(C, I-Grade)
■ Operation Up to 125°C (H-Grade)
■ Guaranteed Failsafe Receiver Operation Over the
www.DaEtnatSirheeeCto4Um.cmomon Mode Range
■ Current Limited Drivers and Thermal Shutdown
■ Delayed Micropower Shutdown: 5μA Maximum
(C, I-Grade)
■ Power Up/Down Glitch-Free Driver Outputs
■ Low Operating Current: 900μA Maximum in Receive
Mode
■ Compatible with TIA/EIA-485-A Specifications
■ Available in 8-Lead and 10-Lead 3mm × 3mm DFN
and 8-Lead and 10-Lead MSOP Packages
APPLICATIONS
■ Low Power RS485/RS422 Transceiver
■ Level Translator
■ Backplane Transceiver
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
20Mbps and Slew Rate
Limited 15kV RS485/RS422
Transceivers
DESCRIPTION
The LTC®2856-1, LTC2856-2, LTC2857-1, LTC2857-2,
LTC2858-1 and LTC2858-2 are low power, RS485/RS422
transceivers operating on 5V supplies at maximum data
rates of 20Mbps or 250kbps for low EMI. The receiver has
a one-eighth unit load, supporting up to 256 nodes per
bus (C, I-Grade), and a failsafe feature that guarantees a
high output state under conditions of floating or shorted
inputs.
The driver maintains a high output impedance over the
entire common mode range when disabled or when the
supply is removed. Excessive power dissipation caused by
bus contention or a fault is prevented by current limiting
all outputs and by thermal shutdown.
Enhanced ESD protection allows these parts to withstand
±15kV (human body model) on the transceiver interface
pins without latchup or damage.
PART
NUMBER
LTC2856-1
LTC2856-2
LTC2857-1
LTC2857-2
LTC2858-1
LTC2858-2
MAX DATA
RATE (Mbps)
20
0.25
20
0.25
20
0.25
DUPLEX
Half
Half
Full
Full
Full
Full
PACKAGE
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-10, DFN-10
MSOP-10, DFN-10
TYPICAL APPLICATION
LTC2856-1
RO1
R
RE1
VCC1
DE1
DI1 D
GND1
RT
LTC2856-1
RO2
R
RE2
VCC2
RT
DE2
DI2 D
GND2
285678 TA01a
LTC2858-1 at 20Mbps
DI
Y
Z
Y-Z
20ns/DIV
2856 TA01b
285678fe
1
1 page  
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
SWITCHING CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
ICCT
ICCTR
Supply Current in Transmit Mode
Supply Current with Both Driver and Receiver
Enabled
No
RE
Load,
= VCC
DE
=
VCC,
No
RE
Load,
= 0V
DE
=
VCC,
LTC2856-1
LTC2858-1
LTC2856-2
LTC2858-2
LTC2856-1
LTC2857-1
LTC2858-1
LTC2856-2
LTC2857-2
LTC2858-2
●
●
●
●
630 1000
670 1100
660 1100
700 1200
w wDrwive.r Din LaTCt2a856S-1h, LeTCe28t574-1U, L.TCc28o58m-1
fMAX Maximum Data Rate
tPLHD, tPHLD Driver Input to Output
ΔtPD Driver Input to Output Difference |tPLHD – tPHLD|
tSKEWD
Driver Output Y to Output Z
tRD, tFD
Driver Rise or Fall Time
tZLD, tZHD,
tLZD, tHZD
Driver Enable or Disable Time
tZHSD, tZLSD Driver Enable from Shutdown
tSHDN
Time to Shutdown
(Note 3)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RL = 500Ω, CL = 50pF, RE = 0V,
LTC2856-1, LTC2858-1 (Figure 5)
RL = 500Ω, CL = 50pF, RE = VCC,
LTC2856-1, LTC2858-1 (Figure 5)
(DE = ↓, RE = VCC) or (DE = 0V, RE = ↑),
LTC2856-1, LTC2858-1 (Figure 5)
●
●
●
●
●
●
●
●
20
10 50
16
1 ±6
4 12.5
70
8
100
Driver in LTC2856-2, LTC2857-2, LTC2858-2
fMAXS
tPLHDS, tPHLDS
ΔtPDS
tSKEWDS
tRDS, tFDS
tZHDS, tZLDS
tLZDS, tHZDS
tZHSDS, tZLSDS
tSHDNS
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference |tPLHD – tPHLD|
Driver Output A to Output B
Driver Rise or Fall Time
Driver Enable Time
Driver Disable Time
Driver Enable from Shutdown
Time to Shutdown
(Note 3)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RDIFF = 54Ω, CL = 100pF (Figure 4)
RL = 500Ω, CL = 50pF, RE = 0V,
LTC2856-2, LTC2858-2 (Figure 5)
RL = 500Ω, CL = 50pF, RE = 0V,
LTC2856-2, LTC2858-2 (Figure 5)
RL = 500Ω, CL 50pF, RE = VCC,
LTC2856-2, LTC2858-2 (Figure 5)
(DE = 0V, RE↑) or (DE = ↓, RE = VCC),
LTC2856-2, LTC2858-2 (Figure 5)
● 250
●
●
●
●
●
●
●
●
0.95 1.5
50 500
200 ±500
0.90 1.5
300
70
8
500
Receiver
tPLHR, tPHLR Receiver Input to Output
tSKEWR
tRR, tFR
tZLR, tZHR,
tLZR, tHZR
Differential Receiver Skew, |tPLHR – tPHLR|
Receiver Output Rise or Fall Time
Receiver Enable/Disable
tZHSR, tZLSR Receiver Enable from Shutdown
CL = 15pF, VCM = 1.5V, |VAB| = 1.5V,
tR and tF < 4ns (Figure 6)
CL = 15pF (Figure 6)
CL = 15pF (Figure 6)
RL = 1k, CL = 15pF, DE = VCC,
LTC2856-1, LTC2856-2, LTC2858-1,
LTC2858-2 (Figure 7)
RL = 1k, CL = 15pF, DE = 0V,
LTC2856-1, LTC2856-2, LTC2858-1,
LTC2858-2 (Figure 7)
●
●
●
●
●
50 70
16
3 12.5
50
8
UNITS
μA
μA
μA
μA
Mbps
ns
ns
ns
ns
ns
μs
ns
kbps
μs
ns
ns
μs
ns
ns
μs
ns
ns
ns
ns
ns
μs
285678fe
5
5 Page 
BLOCK DIAGRAMS
LTC2856-1, LTC2856-2
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
LTC2857-1, LTC2857-2
RO RECEIVER
RE SLEEP/SHUTDOWN
DE LOGIC AND DELAY
www.DataSheet4U.com
DI
DRIVER
A
(15kV)
B
(15kV)
RO
DI
2856 BD
LTC2858-1, LTC2858-2
RECEIVER
DRIVER
A
(15kV)
B
(15kV)
Z
(15kV)
Y
(15kV)
2857 BD
RO RECEIVER
RE SLEEP/SHUTDOWN
DE LOGIC AND DELAY
DI DRIVER
A
(15kV)
B
(15kV)
Z
(15kV)
Y
(15kV)
2858 BD
285678fe
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC2858-1.PDF ] | |
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