LTC1348 LINER [Linear Technology], LTC1348 Datasheet

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LTC1348

Manufacturer Part Number
LTC1348
Description
3.3V/5V Low Power RS232 3-Driver/5-Receiver Transceiver
Manufacturer
LINER [Linear Technology]
Datasheet

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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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LTC1348 Summary of contents

Page 1

... 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 ...

Page 2

... V ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1348C................................................ LTC1348I............................................ – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 ELECTRICAL C HARA TERISTICS 5.5V 0.1 F, unless otherwise noted. ...

Page 3

... Mode) LHR t (Figure 2) (Receiver Alive Mode) HLR t (Figure 2) (Receiver Alive Mode) LHR Note 3: Supply current measurement in Shutdown is performed with V and V DREN Note 4: Supply current measurement in Receiver Alive mode is performed with and V DREN LTC1348 MIN TYP MAX 8.0 7.5 – 8.0 – 7.0 0.2 0.6 2.0 0 ...

Page 4

... 100 150 5000 DRIVER DATA RATE LTC1348 G02 Driver Leakage in SHUTDOWN vs Temperature ( 3. –20V OUT 20V OUT 100 TEMPERATURE ( C) LTC1348 G07 200 250 LTC1348 G03 LTC1348 G06 ...

Page 5

... All Drivers Alive. All Drivers Shutdown. All Driver Outputs in Three-State. All Driver Pull-Up Resistors Disconnect From All Drivers Alive. LTC1348 = 0V. The driver outputs are CC RECEIVERS All Receivers Shutdown. All Receiver Outputs Assume High Impedance. All Receiver Outputs in Three-State. All Receivers Alive. ...

Page 6

... This allows the LTC1348 drivers to provide guar- anteed 5V RS232-compliant voltage levels with a 3.3V supply. With all outputs loaded with 3k , the LTC1348 can typically swing 5V with voltages as low as 2.85V. It will meet the 3.7V EIA562 levels with supply voltages as ...

Page 7

... RS232 serial port, with only one driver (TX) driven at high speed and the other two drivers (RTS and DTR) driven at a relatively low data rate or at DC. Under the same conditions, the LTC1348 can go as fast as 350kbaud and still meet EIA562 ( 3.7V) minimum driver output levels. – ...

Page 8

... LTC1348 PACKAGE DESCRIPTION 0.205 – 0.212** (5.20 – 5.38) 0 – 8 0.005 – 0.009 0.022 – 0.037 (0.13 – 0.22) (0.55 – 0.95) * DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.291 – ...

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