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LTC2845IG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC2845
sn2845 2845fs
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
3.3V Software-Selectable
Multiprotocol Transceiver
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Data Networking
■
CSU and DSU
■
Data Routers
■
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
■
Operates from Single 3.3V Supply with LTC2846 or
a Single 5V Supply with 3.3V Logic with LTC2847
■
TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant,
Report No.: TBR2/050101/02
■
Complete DTE or DCE Port with LTC2846 or LTC2847
■
Available in a 36-Lead Narrow (0.209") SSOP and
38-Lead (7mm x 5mm) QFN package
The LTC
®
2845 is a 5-driver/5-receiver multiprotocol trans-
ceiver. The LTC2845 and LTC2846 form the core of a
complete software-selectable DTE or DCE interface port that
supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36
or X.21 protocols.
The LTC2845 operates from a 3.3V supply and supplies
provided by the LTC2846. This part is available in a 36-lead
SSOP and 38-lead (7mm x 5mm) QFN package. The LTC2845
and LTC2847 in QFN packages offer the smallest multiprotocol
serial port available.
D2 D1
LTC2845
RTS
DTRDSR DCDCTS
D3
R2 R1
R3
LLRITMRL
TXDSCTETXC
RXCRXD
21424111512179314192062322513 81018*21 25 7 16
D4D5
R4R5
LTC2846
D1D2D3
R1R2R3
TTTTT
*OPTIONAL
2845 TA01
RTS A (105)
RTS B
DTR A (108)
DTR B
CTS A (106)
SG (102)
SHIELD (101)
DB-25 CONNECTOR
DCD A (109)
DCD B
DSR A (107)
DSR B
LL A (141)
RI A (125)
TM A (142)
RL A (140)
CTS B
SCTE B
SCTE A (113)
TXD B
TXD A (103)
TXC A (114)
TXC B
RXC A (115)
RXC B
RXD A (104)
RXD B
2
LTC2845
sn2845 2845fs
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
(Note 1)
Supply Voltage
V
CC
....................................................... –0.3V to 6.5V
V
IN
.....................................................................
–0.3V to 6.5V
V
EE
......................................................................
–10V to 0.3V
V
DD
.....................................................................
–0.3V to 10V
Input Voltage
Transmitters ........................... –0.3V to (V
CC
+ 0.3V)
Receivers............................................... –18V to 18V
Logic Pins .............................. –0.3V to (V
CC
+ 0.3V)
Output Voltage
Transmitters .................. (V
EE
– 0.3V) to (V
DD
+ 0.3V)
Receivers................................. –0.3V to (V
IN
+ 0.3V)
The ● denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
IN
= 3.3V, V
DD
= 8V, V
EE
= – 7V for V.28, – 5.5V for V.10, V.11
(Notes 2, 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
I
CC
V
CC
Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 2.7 mA
All Digital Pins = GND or V
IN
) RS530, RS530-A, X.21 Modes, Full Load ● 110 150 mA
V.28 Mode, No Load ● 13 mA
V.28 Mode, Full Load
● 13 mA
No-Cable Mode
● 700 1400 µA
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output.......................................... Indefinite
V
EE
.................................................................. 30 sec
Operating Temperature Range
LTC2845C ............................................... 0°C to 70°C
LTC2845I........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
LTC2845CG
LTC2845IG
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
V
CC
V
DD
D1
D2
D3
R1
R2
R3
D4
R4
M0
M1
M2
DCE/DTE
D4ENB
R4EN
R5
D5
V
EE
GND
D1 A
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
R2 A
R2 B
R3 A
R3 B
D4 A
R4 A
R5 A
D5 A
V
IN
V
CC
R1
D2
D1
D3
R3
G PACKAGE
36-LEAD PLASTIC SSOP
D5
R5
D4
R2
R4
T
JMAX
= 125°C, θ
JA
= 90°C/W, θ
JC
= 35°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC2845CUHF
LTC2845IUHF
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (7mm × 5mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1D2
D3
R1
R2
R3
D4
R4
M0
M1
M2
NC
DCE/DTE
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
R2 A
R2 B
R3 A
R3 B
D4 A
R4 A
R5 A
D1
V
DD
V
CC
V
EE
V
EE
GND
D1 A
D4ENB
R4EN
R5
D5
V
CC
V
IN
D5 A
23
22
21
20
9
10
11
12
39
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD IS V
EE
(PIN 39)
MUST BE SOLDERED TO PCB
UHF PART
MARKING
2845
2845I
3
LTC2845
sn2845 2845fs
The ● denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
IN
= 3.3V, V
DD
= 8V, V
EE
= – 7V for V.28, – 5.5V for V.10, V.11
(Notes 2, 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
EE
V
EE
Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 2 mA
All Digital Pins = GND or V
IN
) RS530, X.21 Modes, Full Load 23 mA
RS530-A, Full Load 34 mA
V.28 Mode, No Load 1 mA
V.28 Mode, Full Load 12 mA
No-Cable Mode 10 µA
I
DD
V
DD
Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 0.3 mA
All Digital Pins = GND or V
IN
) RS530, RS530-A, X.21 Modes, Full Load 0.3 mA
V.28 Mode, No Load 1 mA
V.28 Mode, Full Load 13.5 mA
No-Cable Mode 10 µA
I
VIN
V
IN
Supply Current (DCE Mode, All Modes Except No-Cable Mode 650 µA
All Digital Pins = GND or V
IN
)
P
D
Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 240 mW
All Digital Pins = GND or V
IN
) V.28 Mode, Full Load 64 mW
Logic Inputs and Outputs
V
IH
Logic Input High Voltage ● 2V
V
IL
Logic Input Low Voltage V
CC
= 5V ● 0.8 V
R4EN when V
CC
= 3.3V 0.5 V
I
IN
Logic Input Current D1, D2, D3, D4, D5 ● ±10 µA
M0, M1, M2, DCE, D4ENB, R4EN = GND
● –30 –75 –120 µA
M0, M1, M2, DCE, D4ENB, R4EN = V
IN
● ±10 µA
V
OH
Output High Voltage I
O
= –3mA ● 2.7 3 V
V
OL
Output Low Voltage I
O
= 1.6mA ● 0.2 0.4 V
I
OSR
Output Short-Circuit Current 0V ≤ V
O
≤ V
IN
● ±50 mA
I
OZR
Three-State Output Current M0 = M1 = M2 = V
IN
, V
O
= GND ● –30 –85 –160 µA
M0 = M1 = M2 = V
IN
, V
O
= V
IN
● ±10 µA
V.11 Driver
V
ODO
Open Circuit Differential Output Voltage R
L
= 1.95k (Figure 1) ● ±5V
V
ODL
Loaded Differential Output Voltage R
L
= 50Ω (Figure 1) 0.5V
ODO
0.67V
ODO
V
● ±2V
∆V
OD
Change in Magnitude of Differential R
L
= 50Ω (Figure 1) ● 0.2 V
Output Voltage
V
OC
Common Mode Output Voltage R
L
= 50Ω (Figure 1) ● 3V
∆V
OC
Change in Magnitude of Common Mode R
L
= 50Ω (Figure 1) ● 0.2 V
Output Voltage
I
SS
Short-Circuit Current V
OUT
= GND ±150 mA
I
OZ
Output Leakage Current –0.25V ≤ V
O
≤ 0.25V, Power Off or ● ±1 ±100 µA
No-Cable Mode or Driver Disabled
t
r
, t
f
Rise or Fall Time LTC2845C (Figures 2, 5) ● 21525ns
LTC2845I (Figures 2, 5)
● 21535ns
t
PLH
Input to Output LTC2845C (Figures 2, 5) ● 20 40 65 ns
LTC28451 (Figures 2, 5)
● 20 40 75 ns
t
PHL
Input to Output LTC2845C (Figures 2, 5) ● 20 40 65 ns
LTC2845I (Figures 2, 5)
● 20 40 75 ns
∆t Input to Output Difference, t
PLH
– t
PHL
LTC2845C (Figures 2, 5) ● 0312ns
LTC2845I (Figures 2, 5)
● 0317ns
t
SKEW
Output to Output Skew (Figures 2, 5) 3 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2845IG#TRPBF

Mfr. #:
Buy LTC2845IG#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 3.3V Sftwr-Sel Mutiprotocol Tran
Lifecycle:
New from this manufacturer.
Delivery:
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