|
|
PDF LTC2844 Data sheet ( Hoja de datos )
| Número de pieza | LTC2844 | |
| Descripción | 3.3V Software-Selectable Multiprotocol Transceiver | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC2844 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
LTC2844
3.3V Software-Selectable
Multiprotocol Transceiver
FEATURES
s Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
s Operates from Single 3.3V Supply with LTC2846
s TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant,
Report No.: TBR2/051501/02
s Complete DTE or DCE Port with LTC2846
s 28-Lead SSOP Surface Mount Package
U
APPLICATIO S
s Data Networking
s CSU and DSU
s Data Routers
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
LL CTS DSR
DCD DTR RTS
RXD RXC
TXC SCTE TXD
LTC2844
D4
R4 R3 R2 R1
D3 D2 D1
LTC2846
D3 D2 D1
R3 R2 R1
TT
TTT
18 13 5 22 6
10 8 23 20 19 4 1 7 16 3 9 17
12 15 11 24 14 2
DB-25 CONNECTOR
2844 TA01
sn2844 2844fs
1
1 page  
LTC2844
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
are negative. All voltages are referenced to device ground unless otherwise
specified.
Note 3: All typicals are given for VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V
for V.28, – 5.5V for V.10, V.11 and TA = 25°C.
TYPICAL PERFOR A CE CHARACTERISTICS
RS530, X.21 in DCE Mode
(Three V.11 Drivers with Full
Load) ICC vs Data Rate
125
TA = 25°C
120
115
110
105
100
95
90
10
100 1000
DATA RATE (kBd)
10000
2844 G01
RS530, X.21 in DCE Mode
(Three V.11 Drivers with Full
Load) ICC vs Temperature
105
100
95
90
85
80
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
2844 G04
RS530-A in DTE Mode
(Two V.10 Drivers with Full Load)
IEE vs Data Rate
26
TA = 25°C
24
22
20
18
16
14
10
20 30 40 50 60 70 80 100
DATA RATE (kBd)
2844 G02
RS530-A in DTE Mode
(Two V.10 Drivers with Full Load)
IEE vs Temperature
23.5
25.4
25.3
25.2
25.1
25.0
24.9
24.8
24.7
24.6
24.5
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
2844 G05
V.28 in DCE Mode
(Three V.28 Drivers with Full
Load) IDD vs Data Rate
10
TA = 25°C
9
8
7
6
5
4
10 20 30 40 50 60 70 80 100
DATA RATE (kBd)
2844 G03
V.28 in DCE Mode
(Three V.28 Drivers with Full
Load) IDD vs Temperature
8.20
8.15
8.10
8.05
8.00
7.95
7.90
7.85
7.80
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
2844 G06
sn2844 2844fs
5
5 Page 
LTC2844
APPLICATIONS INFORMATION
Mode Selection
The interface protocol is selected using the mode select
pins M0, M1 and M2 (see the Mode Selection table).
For example, if the port is configured as a V.35 interface,
the mode selection pins should be M2 = 1, M1 = 0, M0 = 0.
For the control signals, the drivers and receivers will
operate in V.28 (RS232) electrical mode. For the clock and
data signals, the drivers and receivers will operate in V.35
electrical mode. The DCE/DTE pin will configure the port
for DCE mode when high, and DTE when low.
The interface protocol may be selected simply by plug-
ging the appropriate interface cable into the connector.
The mode pins are routed to the connector and are left
unconnected (1) or wired to ground (0) in the cable as
shown in Figure 10.
The internal pull-up current sources will ensure a binary 1
when a pin is left unconnected and that the LTC2846/
LTC2844 enter the no-cable mode when the cable is
removed. In the no-cable mode the LTC2846/LTC2844
supply current drops to less than 900µA and all driver
outputs are forced into a high impedance state.
The mode selection may also be accomplished by using
jumpers to connect the mode pins to ground or VIN.
(DATA)
M0 15
LTC2846 M1 16
M2 18
DCE/DTE 19
LTC2844
14
DCE/DTE
13
M2
12
M1
11
M0
(DATA)
CONNECTOR
NC
NC
CABLE
2844 F10
Figure 10. Single Port DCE V.35 Mode Selection in the Cable
sn2844 2844fs
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC2844.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC2844 | 3.3V Software-Selectable Multiprotocol Transceiver | Linear |
| LTC2845 | 3.3V Software-Selectable Multiprotocol Transceiver | Linear |
| LTC2846 | 3.3V Software-Selectable Multiprotocol Transceiver with Termination |  Linear Technology |
| LTC2847 | Software-Selectable Multiprotocol Transceiver | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |