LTC1348IG Linear Technology, LTC1348IG Datasheet

IC TXRX 3.3V/5V RS232 28-SSOP

LTC1348IG

Manufacturer Part Number
LTC1348IG
Description
IC TXRX 3.3V/5V RS232 28-SSOP
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LTC1348IG

Number Of Drivers/receivers
3/5
Protocol
RS232
Voltage - Supply
3 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1348IG
Manufacturer:
LT
Quantity:
4 000
Part Number:
LTC1348IG
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1348IG#PBF
Manufacturer:
LTC
Quantity:
270
Part Number:
LTC1348IG#TR
Manufacturer:
TI
Quantity:
50
Part Number:
LTC1348IG#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURE
A
TYPICAL
0.1 F
PPLICATI
Low Supply Current: 600 A at 3.3V
Supply Current in Shutdown: 0.2 A
Supply Current in Receiver Alive Mode: 15 A
ESD Protection over 10kV
Operates from a Single 3V to 5.5V Supply
Operates to 120kBaud with 0.1 F Flying Capacitors
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to 25V
Without Damage
Flowthrough Architecture
C5
Notebook Computers
Palmtop Computers
Printers
Portable Instruments
0.1 F
0.1 F
DR 1 OUT
DR 2 OUT
DR 3 OUT
C2
C1
3-Drivers/5-Receivers with Shutdown
RX1 IN
RX2 IN
RX3 IN
RX4 IN
RX5 IN
V
S
A
V
CC
+
O
PPLICATI
10
11
12
13
14
1
2
3
4
5
6
7
8
9
U
S
LTC1348
O
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DR 1 IN
RX1 OUT
DR 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR 3 IN
RX5 OUT
DREN
RXEN
GND
V
LT1348 • TA01
C3
0.1 F
C4
0.1 F
3-Driver/5-Receiver Transceiver
D
The LTC
with very low supply current. The charge pump only
requires five 0.1 F capacitors. The LTC1348 provides full
RS232 output levels when operated over a wide supply
range of 3V to 5.5V
The transceiver operates in one of four modes: Normal,
Receiver Disable, Receiver Alive and Shutdown. In Normal
or Receiver Disable mode, I
800 A at 5V in the no load condition. In Shutdown mode,
the supply current is further reduced to 0.2 A. In Receiver
Alive mode, all five receivers are kept alive and the supply
current is 15 A. All RS232 outputs assume a high imped-
ance state in Shutdown or Receiver Alive mode or with the
power off. The receiver outputs assume a high impedance
state in Receiver Disable or with the power off.
The LTC1348 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver oper-
ates up to 120kbaud with all drivers loaded with 1000pF,
3k . Both driver outputs and receiver inputs can be forced
to 25V without damage and can survive multiple 10kV
ESD strikes.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
3.3V/5V Low Power RS232
®
1348 is a 3-driver/5-receiver RS232 transceiver
1.6
1.0
0.8
0.6
0.4
1.4
1.2
0.2
0
–40
–20
V
V
U
V
CC
CC
CC
OR 5V
Supply Current
TEMPERATURE (˚C)
= 3.3V
= 3.3V
0
= 5V
20
CC
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
is only 600 A at 3.3V and
40
60
LT1348 •TA02
LTC1348
80
1.6
1.0
0.8
0.6
0.4
0
1.4
1.2
0.2
1

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LTC1348IG Summary of contents

Page 1

... RS232 specifications. The transceiver oper- ates up to 120kbaud with all drivers loaded with 1000pF Both driver outputs and receiver inputs can be forced to 25V without damage and can survive multiple 10kV ESD strikes. , LTC and LT are registered trademarks of Linear Technology Corporation. – ...

Page 2

... CC V OUT ORDER PART TOP VIEW NUMBER + – – – LTC1348CG LTC1348CSW 4 25 DR1 RX1 OUT 24 LTC1348IG – DR2 IN LTC1348ISW 7 22 RX2 OUT 8 21 RX3 OUT 9 20 RX4 OUT 10 19 DR3 RX5 OUT 12 17 DREN 13 RXEN GND SW PACKAGE 28-LEAD PLASTIC 125 C, ...

Page 3

D C ELECTRICAL C HARA TERISTICS 5.5V 0.1 F, unless otherwise noted. CC PARAMETER Power Supply Generator + V Output Voltage – V Output Voltage Supply Rise Time Power Supply V Supply ...

Page 4

LTC1348 W U TYPICAL PERFORMANCE CHARACTERISTICS Driver Output Voltage High/Low vs Load Capacitance ( 250kbps 120kbps 5 64kbps 4 20kbps OUTPUT HIGH 3. 0.1 F FLYING CAPACITORS 0 ALL DRIVERS ...

Page 5

CTIO 5.5V Input Supply Pin. This pin should be CC decoupled with a 0.1 F ceramic capacitor. GND: Ground Pin. RXEN: TTL/CMOS Compatible Enable Pin. Refer to Table 1 for ...

Page 6

LTC1348 U W SWITCHI WAVEFOR S DRIVER 1.4V INPUT DRIVER 0V OUTPUT t LHD Figure 1. Driver Propagation Delay Timing TEST CIRCUITS DRIVER OUTPUT DRIVER DRIVER INPUT Figure 3. Driver Timing Test Load OUTPUT RX INPUT RX ...

Page 7

... Figure 5. Data Rate Evaluation Circuit Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. W ...

Page 8

... G28 SSOP 0694 0.697 – 0.712* (17.70 – 18.08 (10.007 – 10.643 S28 (WIDE) 0396 1348fa LT/GP 0197 5K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 0.394 – 0.419 ...

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