3.3V Software-Selectable Multiprotocol Transceiver
Description
U U
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 transceiver.
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
TXD A (103) TXD B SCTE A (113) SCTE B TXC A (114) TXC B
RXC A (115) RXC B RXD A (104) RXD B SG (102) SHIELD (101) RTS A (105) RTS B DTR A (108) DTR B DCD A (109) DCD B
DSR A (107) DSR B CTS A (106) CTS B LL A (141)
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
U WW W
LTC2844
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage VCC –0.
3V to 6.
5V VIN .
.
.
.
– 0.
3V to 6.
5V VEE –10V to 0.
3V VDD .
.
.
.
– 0.
3V to 10V
Input Voltage Transmitters .
.
.
– 0.
3V to (VCC + 0.
3V) Receivers .
.
.
– 18V...
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