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LTC2847CUHF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC2847
sn2847 2847fs
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
■
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 5V Supply
■
Separate Supply Pin for Digital Interface Works
down to 3V
■
On-Chip Cable Termination
■
Complete DTE or DCE Port with LTC2845
■
Available in 38-Pin 5mm × 7mm QFN Package
The LTC
®
2847 is a 3-driver/3-receiver multiprotocol trans-
ceiver with on-chip cable termination. When combined with
the LTC2845, this chip set forms a complete software-
selectable DTE or DCE interface port that supports the
RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21
protocols. All necessary cable termination is provided inside
the LTC2847.
The V
CC
supplies the drivers, the receivers and an internal
charge pump that requires only five space-saving surface
mounted capacitors. The V
IN
supply drives the digital inter-
face circuitry including the receiver output drivers. It can be
tied to V
CC
or be powered off a lower supply (down to 3V) to
interface with low voltage ASICs. The LTC2847 is available in
a 0.8mm tall, 5mm × 7mm QFN package.
Software-Selectable
Multiprotocol Transceiver with
Termination and 3.3V Digital Interface
D2 D1
LTC2845
RTS
DTRDSR DCDCTS
D3
R2 R1R4
R3
LTC2847
RILLTMRL
TXDSCTETXC
RXCRXD
21424111512179314192082310513 622182521 716
2847 TA01
D1
SCTE B
SCTE A (113)
TXD B
TXD A (103)
RXC A (115)
RXC B
RXD A (104)
RXD B
RTS A (105)
RTS B
DTR A (108)
DTR B
LL A (141)
TM (142)
RL (140)
SG (102)
SHIELD (101)
DB-25 CONNECTOR
TXC A (114)
DCD A (109)
DCD B
DSR A (107)
DSR B
D4
R5
D5
D2D3
R1R2R3
TXC B
TTTTT
CTS A (106)
CTS B
RI (125)
*
*OPTIONAL
2
LTC2847
sn2847 2847fs
ORDER PART
NUMBER
(Note 1)
V
CC
Voltage.............................................. –0.3V to 6.5V
V
IN
Voltage .............................................. –0.3V to 6.5V
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)
V
EE
........................................................ –10V to 0.3V
V
DD
....................................................... –0.3V to 10V
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output.......................................... Indefinite
V
EE
.................................................................. 30 sec
Operating Temperature Range
LTC2847C ............................................... 0°C to 70°C
LTC2847I........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
LTC2847CUHF
LTC2847IUHF
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
IN
= 3.3V, unless otherwise noted (Notes 2, 3)
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
UHF PART
MARKING
2847
2847I
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (7mm × 5mm) PLASTIC QFN
UNDERSIDE METAL INTERNALLY CONNECTED TO V
EE
(PCB CONNECTION OPTIONAL)
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
1
23
22
21
20
9
10
11
12
NC
V
DD
NC
V
CC
D1
D2
D3
R1
R2
R3
M0
M1
V
IN
M2
DCE/DTE
R3 B
R3 A
NC
NC
C1
+
C1
–
V
EE
C2
+
C2
–
V
EE
V
EE
GND
GND
D1 A
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
NC
NC
R2 A
R2 B
T
JMAX
= 125°C, θ
JA
= 34°C/W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
I
CC
V
CC
Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 14 mA
All Digital Pins = GND or V
IN
) RS530, RS530-A, X.21 Modes, Full Load ● 100 130 mA
V.35 Mode
● 126 170 mA
V.28 Mode, No Load 20 mA
V.28 Mode, Full Load
● 35 75 mA
No-Cable Mode
● 300 900 µA
I
VIN
V
IN
Supply Current All Modes Except No-Cable Mode 405 µA
(DCE Mode, All Digital Pins = GND or V
IN
)
P
D
Internal Power Dissipation (DCE Mode) RS530, RS530-A, X.21 Modes, Full Load 410 mW
V.35 Mode, Full Load 625 mW
V.28 Mode, Full Load 150 mW
V
+
Positive Charge Pump Output Voltage V.11 or V.28 Mode, No Load ● 8 9.3 V
V.35 Mode
● 7 8.0 V
V.28 Mode, with Load
● 8 8.7 V
V.28 Mode, with Load, I
DD
= 10mA 6.5 V
3
LTC2847
sn2847 2847fs
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
IN
= 3.3V, unless otherwise noted (Notes 2, 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
–
Negative Charge Pump Output Voltage V.28 Mode, No Load –9.6 V
V.28 Mode, Full Load
● –7.5 –8.5 V
V.35 Mode
● –5.5 –6.5 V
RS530, RS530-A, X.21 Modes, Full Load
● –4.5 –6.0 V
f
OSC
Charge Pump Oscillator Frequency 500 kHz
t
r
Charge Pump Rise Time No-Cable Mode/Power-Off to Normal Operation 2 ms
Logic Inputs and Outputs
V
IH
Logic Input High Voltage D1, D2, D3, M0, M1, M2, DCE/DTE ● 2.0 V
V
IL
Logic Input Low Voltage D1, D2, D3, M0, M1, M2, DCE/DTE ● 0.8 V
I
IN
Logic Input Current D1, D2, D3 ● ±10 µA
M0, M1, M2, DCE/DTE = GND
● –30 –75 –120 µA
M0, M1, M2, DCE/DTE = 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
R
L
= 50Ω (Figure 1) ● ±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 V
A
and V
B
≤ 0.25V, Power Off or ● ±1 ±100 µA
No-Cable Mode or Driver Disabled
t
r
, t
f
Rise or Fall Time (Figures 2, 13) ● 21525 ns
t
PLH
Input to Output Rising (Figures 2, 13) ● 15 40 65 ns
t
PHL
Input to Output Falling (Figures 2, 13) ● 15 40 65 ns
∆t Input to Output Difference, t
PLH
– t
PHL
(Figures 2, 13) ● 0312 ns
t
SKEW
Output to Output Skew (Figures 2, 13) 3 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2847CUHF#PBF

Mfr. #:
Buy LTC2847CUHF#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 3.3V and 5V Multiprotocol Xcvr
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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