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LTC2844IG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC2844
sn2844 2844fs
FEATURES
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.
■
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
■
Operates from Single 3.3V Supply with LTC2846
■
TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant,
Report No.: TBR2/051501/02
■
Complete DTE or DCE Port with LTC2846
■
28-Lead SSOP Surface Mount Package
The LTC
®
2844 is a 4-driver/4-receiver multiprotocol trans-
ceiver. The LTC2844 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 LTC2844 operates from a 3.3V supply and supplies
provided by the LTC2846. The part is available in a 28-lead
SSOP surface mount package.
APPLICATIO S
U
■
Data Networking
■
CSU and DSU
■
Data Routers
D2 D1
LTC2844
RTS
DTRDSR DCDCTS
D3
R2 R1R4
R3
LTC2846
LL
TXDSCTETXC
RXCRXD
21424111512179314192062322513 81018 7 16
2844 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
CTS A (106)
CTS B
LL A (141)
SG (102)
SHIELD (101)
DB-25 CONNECTOR
TXC A (114)
DCD A (109)
DCD B
DSR A (107)
DSR B
D4
D2D3
R1R2R3
TXC B
TTTTT
2
LTC2844
sn2844 2844fs
ORDER PART
NUMBER
(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)
Short-Circuit Duration
Transmitter Output ...................................... Indefinite
Receiver Output........................................... Indefinite
V
EE
................................................................... 30 sec
Operating Temperature Range
LTC2844CG ............................................. 0°C to 70°C
LTC2844IG ......................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LTC2844CG
LTC2844IG
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.
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)
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 ● 95 120 mA
V.28 Mode, No Load
● 12 mA
V.28 Mode, Full Load
● 12 mA
No-Cable Mode
● 600 1200 µA
I
EE
V
EE
Supply Current (DCE Mode Unless RS530, RS530-A, X.21 Modes, No Load 1.6 mA
Otherwise Noted, All Digital Pins = GND or V
IN
) RS530, X.21 Modes, Full Load (DTE Mode) 14 mA
RS530-A, Full Load (DTE Mode) 25 mA
V.28 Mode, No Load 1 mA
V.28 Mode, Full Load 7.5 mA
No-Cable Mode 10 µA
I
DD
V
DD
Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 0.2 mA
All Digital Pins = GND or V
IN
) RS530, RS530-A, X.21 Modes, Full Load 0.2 mA
V.28 Mode, No Load 1 mA
V.28 Mode, Full Load 8 mA
No-Cable Mode 10 µA
I
VIN
V
IN
Supply Current (DCE Mode, All Modes Except No-Cable Mode 490 µA
All Digital Pins = GND or V
IN
)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
V
DD
D1
D2
D3
R1
R2
R3
D4
R4
M0
M1
M2
DCE/DTE
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/R4 A
V
IN
R1
D2
D1
R2
D3
G PACKAGE
28-LEAD PLASTIC SSOP
R3
D4
R4
3
LTC2844
sn2844 2844fs
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
P
D
Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 210 mW
All Digital Pins = GND or V
IN
) V.28 Mode, Full Load 54 mW
Logic Inputs and Outputs
V
IH
Logic Input High Voltage ● 2V
V
IL
Logic Input Low Voltage ● 0.8 V
I
IN
Logic Input Current D1, D2, D3, D4 ● ±10 µA
M0, M1, M2, DCE = GND
● –30 –75 –120 µA
M0, M1, M2, DCE = 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
= 0V ● –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 LTC2844C (Figures 2, 5) ● 21525ns
LTC2844I (Figures 2, 5)
● 21535ns
t
PLH
Input to Output LTC2844C (Figures 2, 5) ● 20 40 65 ns
LTC28441 (Figures 2, 5)
● 20 40 75 ns
t
PHL
Input to Output LTC2844C (Figures 2, 5) ● 20 40 65 ns
LTC2844I (Figures 2, 5)
● 20 40 75 ns
∆t Input to Output Difference, t
PLH
– t
PHL
LTC2844C (Figures 2, 5) ● 0312ns
LTC2844I (Figures 2, 5)
● 0317ns
t
SKEW
Output to Output Skew (Figures 2, 5) 3 ns
V.11 Receiver
V
TH
Input Threshold Voltage –7V ≤ V
CM
≤ 7V ● –0.2 0.2 V
∆V
TH
Input Hysteresis –7V ≤ V
CM
≤ 7V ● 15 40 mV
I
IN
Input Current (A, B) –10V ≤ V
A,B
≤ 10V ● ±0.66 mA
R
IN
Input Impedance –10V ≤ V
A,B
≤ 10V ● 15 30 kΩ
t
r
, t
f
Rise or Fall Time (Figures 2, 6) 15 ns
t
PLH
Input to Output LTC2844C C
L
= 50pF (Figures 2, 6) ● 50 80 ns
LTC2844I C
L
= 50pF (Figures 2, 6) ● 50 90 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2844IG#TRPBF

Mfr. #:
Buy LTC2844IG#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 3.3V Sftwr-Sel Multiprotocol Tran
Lifecycle:
New from this manufacturer.
Delivery:
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