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LTC2854IDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC2854/LTC2855
1
285455fc
For more information www.linear.com/LTC2854
3.3V 20Mbps RS485/RS422
Transceivers with Integrated
Switchable Termination
The LTC
®
2854 and LTC2855 are low power, 20Mbps
RS485/RS422 transceivers operating on 3.3V supplies.
The receiver includes a logic-selectable 120Ω termination,
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 a thermal shutdown.
Enhanced ESD protection allows the LTC2854 to withstand
±25kV (human body model) and the LTC2855 to withstand
±15kV on the transceiver interface pins without latchup
or
damage.
n
Low Power RS485/RS422 Transceiver
n
Level Translator
n
Backplane Transceiver
n
Integrated, Logic-Selectable 120Ω Termination Resistor
n
3.3V Supply Voltage
n
20Mbps Maximum Data Rate
n
No Damage or Latchup Up to ±25kV HBM
n
High Input Impedance Supports 256 Nodes (C-, I-Grade)
n
Operation Up to 125°C (H-Grade)
n
Guaranteed Failsafe Receiver Operation Over the
Entire Common Mode Range
n
Current Limited Drivers and Thermal Shutdown
n
Delayed Micropower Shutdown: 5µA Maximum (C-, I-Grade)
n
Power Up/Down Glitch-Free Driver Outputs
n
Low Operating Current: 370µA Typical in Receive Mode
n
Compatible with TIA/EIA-485-A Specifications
n
Available in 10-Pin 3mm × 3mm DFN, 12-Pin
4mm×3mm DFN and 16-Pin SSOP Packages
LTC2854 at 20Mbps into 54Ω
PART NUMBER DUPLEX PACKAGE
LTC2854 HALF DFN-10
LTC2855 FULL SSOP-16, DFN-12
RE
TE
RO
DE
DI
R
D
285455 TA01
LTC2854
120Ω
RE
RO
TE
DE
DI
R
D
LTC2854
120Ω
RERO TE DE DI
R
D
LTC2854
120Ω
20ns/DIV
2V/DIV
285455 TA01b
A-B
B
A
DI
L, LT, LT C , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
FEATURES DESCRIPTION
APPLICATIONS
PRODUCT SELECTION GUIDE
LTC2854/LTC2855
2
285455fc
For more information www.linear.com/LTC2854
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
) ................................... –0.3V to 7V
Logic Input Voltages (RE, DE, DI, TE)
............ –0.3V to 7V
Interface I/O:
A, B, Y, Z .......................................(V
CC
–15V) to +15V
(A-B) or (B-A) with Terminator Enabled ..................6V
Receiver Output Voltage (RO)
........–0.3V to (V
CC
+0.3V)
(Note 1)
Operating Temperature (Note 4)
LTC2854C, LTC2855C .............................. 0°C to 70°C
LTC2854I, LTC2855I ............................–40°C to 85°C
LTC2854H, LTC2855H ....................... –40°C to 125°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package ......................................................300°C
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
V
CC
B
A
NC
GND
RO
RE
DE
DI
TE
11
EXPOSED PAD (PIN 11) PCB GND CONNECTION
T
JMAX
= 150°C, θ
JA
= 43°C/W
θ
JC
= 2.96°C/W
12
11
10
9
8
7
1
2
3
4
5
6
V
CC
A
B
Z
Y
NC
RO
RE
DE
DI
TE
GND
TOP VIEW
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
13
EXPOSED PAD (PIN 13) PCB GND CONNECTION
T
JMAX
= 150°C, θ
JA
= 44°C/W
θ
JC
= 4.3°C/W
RO
RE
DE
DI
TE
GND
NC
NC
V
CC
B
Z
NC
NC
NC
A
Y
GN PACKAGE
16-LEAD (NARROW 0.150) PLASTIC SSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
T
JMAX
= 150°C, θ
JA
= 110°C/W
θ
JC
= 40°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2854CDD#PBF LTC2854CDD#TRPBF LCQG 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LTC2854IDD#PBF LTC2854IDD#TRPBF LCQG 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC2854HDD#PBF LTC2854HDD#TRPBF LCQG 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LTC2855CDE#PBF LTC2855CDE#TRPBF 2855 12-Lead (4mm × 3mm) Plastic DFN 0°C to
70°C
LTC2855IDE#PBF LTC2855IDE#TRPBF 2855 12-Lead (4mm × 3mm) Plastic DFN –40°C to 85°C
LTC2855HDE#PBF LTC2855HDE#TRPBF 2855 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C
LTC2855CGN#PBF LTC2855CGN#TRPBF 2855 16-Lead (Narrow 0.150) Plastic SSOP 0°C to 70°C
LTC2855IGN#PBF LTC2855IGN#TRPBF 2855I 16-Lead (Narrow 0.150) Plastic SSOP –40°C to 85°C
LTC2855HGN#PBF LTC2855HGN#TRPBF 2855H 16-Lead (Narrow 0.150) Plastic SSOP –40°C
to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2854CDD LTC2854CDD#TR LCQG 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LTC2854IDD LTC2854IDD#TR LCQG 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC2854HDD LTC2854HDD#TR LCQG 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LTC2855CDE LTC2855CDE#TR 2855 12-Lead (4mm × 3mm) Plastic DFN 0°C to 70°C
LTC2855IDE
LTC2855IDE#TR 2855 12-Lead (4mm × 3mm) Plastic DFN –40°C to 85°C
LTC2855HDE LTC2855HDE#TR 2855 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C
LTC2855CGN LTC2855CGN#TR 2855 16-Lead (Narrow 0.150) Plastic SSOP 0°C to 70°C
LTC2855IGN LTC2855IGN#TR 2855I 16-Lead (Narrow 0.150) Plastic SSOP –40°C to 85°C
LTC2855HGN LTC2855HGN#TR 2855H 16-Lead (Narrow 0.150) Plastic SSOP –40°C to 125°C
Consult LTC Marketing for parts specified
with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
PIN CONFIGURATION
LTC2854/LTC2855
3
285455fc
For more information www.linear.com/LTC2854
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V unless otherwise noted (Note 2).
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Driver
|V
OD
| Differential Driver Output Voltage R = ∞, V
CC
= 3V (Figure 1)
R = 27Ω, V
CC
= 3V (Figure 1)
R = 50Ω, V
CC
= 3.13V (Figure 1)
l
l
l
1.5
2
V
CC
V
CC
V
CC
V
V
V
D|V
OD
| Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
R = 27Ω or R = 50Ω (Figure 1)
l
0.2 V
V
OC
Driver Common Mode Output Voltage R = 27Ω or R = 50Ω (Figure 1)
l
3 V
D
|V
OC
| Change in Magnitude of Driver
Common Mode Output Voltage for
Complementary Output States
R = 27Ω or R = 50Ω (Figure 1)
l
0.2 V
I
OZD
Driver Three-State (High Impedance)
Output Current on Y and Z
DE = OV, (Y or Z) = –7V, 12V (LTC2855)
H-Grade
l
l
±10
±50
µA
µA
I
OSD
Maximum Driver Short-Circuit Current –7V ≤ (Y or Z) ≤ 12V (Figure 2)
l
–250
180 ±250
300
mA
mA
Receiver
I
IN
Receiver Input Current (A, B) DE = TE = 0V, V
CC
= 0V or 3.3V, V
IN
= 12V
(Figure 3) (C-, I-Grade)
DE = TE = 0V, V
CC
= 0V or 3.3V, V
IN
= –7V,
(Figure 3) (C-, I-Grade)
l
l
–100
125 µA
µA
DE = TE = 0V, V
CC
= 0V or 3.3V, V
IN
= 12V
(Figure 3) (H-Grade)
DE = TE = 0V, V
CC
= 0V or 3.3V, V
IN
= –7V,
(
Figure 3) (H-Grade)
l
l
–145
250 µA
µA
R
IN
Receiver Input Resistance RE = V
CC
or 0V, DE = TE = 0V,
V
IN
= –7V, –3V, 3V, 7V, 12V (Figure 3)
(C-, I-Grade)
l
96 125 kΩ
RE = V
CC
or 0V, DE = TE = 0V,
V
IN
= –7V, –3V, 3V, 7V, 12V (Figure 3)
(H-Grade)
l
48 125 kΩ
V
TH
Receiver Differential Input Threshold
Voltage
–7V ≤ B ≤ 12V
l
±0.2 V
DV
TH
Receiver Input Hysteresis B
= 0V
25 mV
V
OH
Receiver Output HIGH Voltage I(RO) = –4mA, A-B = 200mV, V
CC
= 3V
l
2.4 V
V
OL
Receiver Output LOW Voltage I(RO) = 4mA, A-B = –200mV, V
CC
= 3V
l
0.4 V
I
OZR
Receiver Three-State (High Impedance)
Output Current on RO
RE = V
CC
, 0V ≤ RO ≤ V
CC
l
±1 µA
I
OSR
Receiver Short-Circuit Current 0V ≤ RO ≤ V
CC
l
±85 mA
R
TERM
Receiver Input Terminating Resistor TE = V
CC
, V
AB
= 2V, V
B
= –7V, 0V, 10V
(Figure 8)
l
108 120 156 Ω
Logic
V
IH
Logic Input High Voltage V
CC
= 3.6V
l
2 V
V
IL
Logic Input Low Voltage V
CC
= 3V
l
0.8 V
I
INL
Logic Input Current
l
0 ±10 µA
Supplies
I
CCS
Supply Current in Shutdown Mode DE = 0V, RE = V
CC
, TE = 0V
(C-, I-Grade)
(H-Grade)
l
l
0
0
5
15
µA
µA
I
CCR
Supply Current in Receive Mode DE = 0V, RE = 0V, TE = 0V
l
370 900 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC2854IDD#PBF

Mfr. #:
Buy LTC2854IDD#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC 3.3V Half-Duplex 20Mbps RS485 Transceiver w/ Integrated Termination
Lifecycle:
New from this manufacturer.
Delivery:
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