LTC2859/LTC2861
7
285961fc
Receiver Skew
vs Temperature
Driver Skew vs Temperature
Driver Propagation Delay
vs Temperature
R
TERM
vs Temperature
Driver Output Low/High Voltage
vs Output Current
Driver Differential Output Voltage
vs Temperature
Receiver Propagation Delay
vs Temperature
Supply Current vs Data Rate
T
A
= 25°C, V
CC
= 5V, unless otherwise noted.
Receiver Output Voltage vs
Output Current (Source and Sink)
Typical perFormance characTerisTics
TEMPERATURE (°C)
–40
RECEIVER SKEW (ns)
0
1
0 40
80
120
285961 G01
2
–20 20
60
100
V
AB
= 1.5V
C
L
= 15pF
TEMPERATURE (°C)
–40
0
DRIVER SKEW (ns)
–1
1
2
0 40
80
120
285961 G02
3
–20 20
60
100
R
DIFF
= 54Ω
C
L
= 100pF
SLO = V
CC
TEMPERATURE (°C)
–40
DRIVER PROP DELAY (ns)
80
285961 G03
0 40
–20 100
20 60 120
12
14
16
10
8
6
4
18
R
DIFF
= 54Ω
C
L
= 100pF
SLO = V
CC
TEMPERATURE (°C)
–40
RESISTANCE (Ω)
115
125
120
285961 G04
105
95
0
40
80
–20
20
60
100
135
110
120
100
130
OUTPUT CURRENT (mA)
0 10
0
OUTPUT VOLTAGE (V)
2
5
20
40
50
285961 G05
1
4
3
30
60
70
V
OH
V
OL
TEMPERATURE (°C)
–40
OUTPUT VOLTAGE (V)
3
4
5
20 60 120
285961 G06
2
1
0
–20 0
40
80 100
R = 54Ω
R = 100Ω
R =
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
3
4
5
4
285961 G07
2
1
0
1
2
3
5
SINK
SOURCE
TEMPERATURE (°C)
–40
PROP DELAY (ns)
50
60
120
285961 G08
40
30
0
40
80
–20
20
60
100
70
45
55
35
65
V
AB
= 1.5V
C
L
= 15pF
10
100
DATA RATE (Mbps)
0
SUPPLY CURRENT (mA)
20
40
60
10
30
50
285961 G09
1
0.1
R = 54Ω
R = 100Ω
R =
LTC2859/LTC2861
8
285961fc
RO (Pin 1):
Receiver Output. If the receiver output is enabled
(RE low) and A > B by 200mV, then RO will be high. If A
< B by 200mV, then RO will be low. If the receiver inputs
are open, shorted, or terminated without a valid signal, RO
will be high.
RE
(Pin 2): Receiver Enable. A low enables the receiver.
A high input forces the receiver output into a high imped-
ance state.
DE (Pin 3): Driver Enable. A high on DE enables the driver.
A low input will force the driver outputs into a high imped-
ance. If
RE
is high with DE and TE LOW, the part will enter
a low power shutdown state.
DI (Pin 4): Driver Input. If the driver outputs are enabled
(DE HIGH), then a low on DI forces the driver positive
output LOW and negative output HIGH. A high on DI,
with the driver outputs enabled, forces the driver positive
output HIGH and negative output LOW.
(DD/DE/GN)
TE (Pin 5): Internal Termination Resistance Enable. A high
input will connect a termination resistor (120typical)
between pins A and B.
GND (Pins 6,11/6,13/6): Ground. Pins 11 and 13 are
backside thermal pad, connected to
Ground.
SLO (Pins
7/7/11): Driver Slew Rate Control. A low input
will force the driver into a reduced slew rate mode.
Y (Pins -/8/12): Positive Driver Output for LTC2861.
Z (Pins -/9/13): Negative Driver Output for LTC2861.
B (Pins 9/10/14): Negative Receiver Input (and Negative
Driver Output for LTC2859).
A (Pins 8/11/15): Positive Receiver Input (and Positive
Driver Output for LTC2859).
V
CC
(Pins 10/12/16): Positive Supply. 4.5V < V
CC
< 5.5V.
Bypass with 0.1µF ceramic capacitor.
pin FuncTions
LTC2859/LTC2861
9
285961fc
LTC2859
LOGIC INPUTS
DE RE TE MODE A, B RO TERMINATOR
0 0 0 Receive R
IN
Enabled Off
0 0 1 Receive with Term R
IN
Enabled On
0 1 0 Shutdown R
IN
Hi-Z Off
0 1 1 Term Only R
IN
Hi-Z On
1 0 0 Transmit with Receive Driven Enabled Off
1 0 1 Transmit with Receive
and Term
Driven Enabled On
1 1 0 Transmit Driven Hi-Z Off
1 1 1 Transmit with Term Driven Hi-Z On
LTC2861
LOGIC INPUTS
DE RE TE MODE A, B Y, Z RO TERMINATOR
0 0 0 Receive R
IN
Hi-Z Enabled Off
0 0 1 Receive with Term R
IN
Hi-Z Enabled On
0 1 0 Shutdown R
IN
Hi-Z Hi-Z Off
0 1 1 Term Only R
IN
Hi-Z Hi-Z On
1 0 0 Transmit with Receive R
IN
Driven Enabled Off
1 0 1 Transmit with Receive
and Term
R
IN
Driven Enabled On
1 1 0 Transmit R
IN
Driven Hi-Z Off
1 1 1 Transmit with Term R
IN
Driven Hi-Z On
LTC2859 LTC2861
FuncTion Tables
block DiaGrams
120Ω
DE
RO
DI
A
(15kV)
TE
B
(15kV)
Z
(15kV)
Y
(15kV)
SLEEP/SHUTDOWN
LOGIC AND DELAY
RECEIVER
DRIVER
RE
SLO
120Ω
DE
RO
DI
A
(15kV)
TE
B
(15kV)
SLEEP/SHUTDOWN
LOGIC AND DELAY
RECEIVER
DRIVER
RE
SLO
2859/61 BD

LTC2861CDE#TRPBF

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC 5V Full-Duplex RS485 Transceiver w/ Integrated Termination & Slew Rate Control
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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