LTC1349 LINER [Linear Technology], LTC1349 Datasheet

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LTC1349

Manufacturer Part Number
LTC1349
Description
5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in Shutdown
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
0.1µF
C1
Low Supply Current: 300µA
Two Receivers Kept Alive in Shutdown
ESD Protection Over ±10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1µF
Operates to 120k Baud
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
Pin Compatible with LT1137A and LT1237
Flowthrough Architecture
Notebook Computers
Palmtop Computers
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
0.1µF
C2
3-Drivers/5-Receivers with Shutdown
ON/OFF
RX1 IN
RX2 IN
RX3 IN
RX4 IN
RX5 IN
V
NC
V
CC
+
10
11
12
13
14
U
1
2
3
4
5
6
7
8
9
LTC1349
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
V
GND
NC
NC
C3
0.1µF
LTC1349 • TA01
C4
0.1µF
3-Driver/5-Receiver Transceiver
DESCRIPTIO
The LTC
with very low supply current. In the no load condition, the
supply current is only 300µA. The charge pump only
requires four 0.1µF capacitors.
In Shutdown mode, two receivers are kept alive and the
supply current is 35µA. All RS232 outputs assume a high
impedance state in Shutdown and with the power off.
The LTC1349 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 2500pF, 3kΩ load. 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.
®
with 2 Receivers Active
1349 is a 3-driver/5-receiver RS232 transceiver
Quiescent and Shutdown Supply Current
1200
1000
800
600
400
200
0
–40
TEST CONDITION:
V
5V Low Power RS232
CC
= 5V, ALL DRIVER INPUTS TIED TO V
–20
U
QUIESCENT
CURRENT
vs Temperature
0
TEMPERATURE (°C)
SHUTDOWN
CURRENT
20
40
in Shutdown
60
80
CC
.
LTC1349
LTC1349 • TA02
100
60
50
40
30
20
10
0
1349fa
1

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LTC1349 Summary of contents

Page 1

... All RS232 outputs assume a high impedance state in Shutdown and with the power off. The LTC1349 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud with a 2500pF, 3kΩ load. Both driver outputs and receiver inputs can be forced to ± ...

Page 2

... Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range Commercial (LTC1349C) ........................ 0°C to 70°C Industrial (LTC1349I) ........................ – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C DC ELECTRICAL CHARACTERISTICS temperature range 5V 0.1µF, unless noted. ...

Page 3

... Supply Current vs Data Rate 2500pF DRIVERS ACTIVE 100 100 125 DATA RATE (k BAUD) UNITS µ UNITS V/µs V/µs µs µs µs µs 150 175 LTC1349 • TPC03 1349fa 3 ...

Page 4

... Receiver Output Waveforms RECEIVER OUTPUT C = 2500pF L INPUT LTC1349 • TPC08 + – and V pins may be paral- + – Commutating Capacitor Inputs. These – + – , and another from maintain 60 80 100 LTC1349 • TPC06 LTC1349 • TPC09 – ≅ 2V – CC 1349fa ...

Page 5

... Figure 1. Driver Propagation Delay Timing 1. 0.8V t LHR Figure 2. Receiver Propagation Delay Timing 51pF 3k LTC1349 • TA03 LTC1349 – HLD LTC1349 • F01 HLR LTC1349 • F02 Receiver Timing Test Load RX OUTPUT RX INPUT RX 51pF LTC1349 • TA04 1349fa 5 ...

Page 6

... DRIVER 1 OUT RX1 OUT 6 23 DRIVER 2 IN RX1 DRIVER 2 OUT RX2 OUT 8 21 RX3 OUT RX2 RX3 IN RX4 OUT 10 19 DRIVER 3 IN RX4 RX5 OUT DRIVER 3 OUT 12 17 RX5 IN GND ON/OFF 0.1µF C3 0.1µF LTC1349 • TC 1349fa ...

Page 7

... MIN .035 – .080 .120 (0.889 – 2.032) (3.175) .100 MIN (2.54) BSC LTC1349 9.90 – 10.50* (.390 – .413 7.40 – 8.20 (.291 – .323 2.0 (.079) 0.05 (.002) G28 SSOP 0802 1 ...

Page 8

... LTC1349 PACKAGE DESCRIPTIO .030 ±.005 .050 BSC TYP N .420 MIN RECOMMENDED SOLDER PAD LAYOUT .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) .005 (0.127) RAD MIN .009 – .013 NOTE 3 (0.229 – 0.330) .016 – ...

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