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LTC2872IUHF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC2872
10
2872f
block DiagraM
2872 BD
CONTROL
LOGIC
DRIVERS
TRANSCEIVER #1
RECEIVERS
LOOPBACK
PATH
0.1µF
DXEN
RXEN1
TE485_1
H/F
485/232_1
DXEN2
DY2
DZ2
RA2
RB2
RXEN2
TE485_2
485/232_2
FEN
LB
DY1
DZ1
RA1
RB1
GND
B1
Y2
Z2
A2
B2
A1
PORT 1
PORT 2
Z1
Y1
V
EE
V
DD
GND
V
CC
GND
1.7V TO 5.5V
(≤ V
CC
)
PULSE-SKIPPING
BOOST REGULATOR
f = 1.2MHz
RT232
RT485
2.2µF
22µH
470nF
3V TO 5.5V
2.2µF
2.2µF
CAP
SWV
CC
V
L
232
485
232
232
485
232
5k
RT232
RT485
125k
5k
125k
125k
120Ω
RT485
120Ω
H/F
125k
TRANSCEIVER #2
35 21 19 17
20
39
18
4
1
5
6
2
3
28
V
CC
GND
31
27
26
30
29
34
32
33
24
25
14
12
23
22
38
37
8
7
13
11
9
10
15
36
16
LTC2872
11
2872f
TesT circuiTs
Figure 1. RS485 Driver DC Characteristics Figure 2. RS485 Driver Output Short-Circuit Current
Figure 3. RS485 Receiver Input Current and Resistance (Note 5)
Figure 4. RS485 Driver Timing Measurement
2872 F01
DRIVER
DY
GND
OR
V
L
Y
R
L
R
L
Z
V
OD
+
–
V
OC
+
–
2872 F03
RECEIVER
A OR B
B OR A
V
IN
I
IN485
R
IN485
=
V
IN
I
IN485
+
–
2872 F04
DRIVER
DY
Y
Z
R
DIFF
C
L
C
L
t
PLHD485
t
SKEWD485
t
PLHD485
t
RD485
t
FD485
90%
0V
V
OD
½V
OD
V
L
0V
DY
Y, Z
Y - Z
10%
90%
0V
10%
2872 F02
DRIVER
Y OR Z
DY
GND
OR
V
L
Z OR Y
V
OUT
I
OZD485
, I
OSD485
+
–
LTC2872
12
2872f
TesT circuiTs
Figure 5. RS485 Driver Enable and Disable Timing Measurements
Figure 6. RS485 Receiver Propagation Delay Measurements (Note 5)
Figure 7. RS485 Receiver Enable and Disable Timing Measurements (Note 5)
2872 F07
t
ZLR485
t
LZR485
t
HZR485
t
ZHR485
½V
L
½V
L
V
L
V
OL
V
L
V
OH
0V
0V
0.5V
RXEN
RA
RA
RECEIVER
RA
RXEN
0V TO 3V
3V TO 0V
A
R
L
B
V
L
OR
GND
C
L
½V
L
0.5V
½V
L
2872 F05
t
ZLD485
,
t
ZLSD485
t
LZD485
t
HZD485
t
ZHD485
,
t
ZHSD485
½V
CC
½V
CC
V
L
V
OL
V
CC
V
OH
0V
0V
0.5V
DXEN
Y OR Z
Z OR Y
DRIVER
DY
DXEN
V
L
OR
GND
Y
R
L
Z
GND
OR
V
CC
V
CC
OR
GND
R
L
C
L
C
L
½V
L
0.5V
½V
L
2872 F06
RECEIVER
V
CM
±V
AB
/2
A
B
RA
±V
AB
/2
C
L
t
PLHR485
t
SKEWR485
= t
PLHR485
– t
PHLR485
t
RR485
90%
0V
½V
L
A–B
RA
10%
t
PHLR485
t
FR485
90%
0V
–V
AB
V
AB
½V
L
10%
V
CC
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC2872IUHF#PBF

Mfr. #:
Buy LTC2872IUHF#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC RS232/RS485 Dual Port Multiprotocol Transceiver with Integrated Termination (Shared I/O)
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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