LTC1382 Linear Technology, LTC1382 Datasheet

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LTC1382

Manufacturer Part Number
LTC1382
Description
5V Low Power RS232 Transceiver with Shutdown
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Operates from a Single 5V Supply
Low Supply Current: I
I
ESD Protection Over 10kV
Uses Small Capacitors: 0.1 F
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to 25V
Without Damage
Pin Compatible with LT1180A
Notebook Computers
Palmtop Computers
CC
LOGIC OUTPUT
LOGIC OUTPUT
= 0.2 A in Shutdown Mode
LOGIC INPUT
LOGIC INPUT
0.1 F
0.1 F
ON/OFF
2-Drivers/2-Receivers with Shutdown
S
A
O
PPLICATI
12
11
13
10
18
2
4
5
6
U
V
V
S
CC
CC
300k
300k
CC
LTC1382
= 220 A
LTC1382 • TA01
5k
5k
O
U
17
3
7
15
8
14
9
16
V
232 OUTPUT
232 OUTPUT
232 INPUT
232 INPUT
CC
0.1 F
= 5V
0.1 F
D
The LTC1382 is an ultra-low power 2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1 F capacitors.
The transceiver operates in one of two modes, Normal
and Shutdown. In the Normal mode, I
with the driver outputs unloaded. In the Shutdown
mode, the charge pump is turned off, the driver outputs
are forced into three-state, both receivers are off and
I
The LTC1382 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3k load. Both
driver outputs and receiver inputs can be forced to
ESD strikes.
CC
25V without damage and can survive multiple 10kV
ESCRIPTIO
drops to 0.2 A.
600
500
100
400
300
200
Quiescent and Shutdown Supply Current
0
–20
TEST CONDITION: V
0
U
SHUTDOWN
RS232 Transceiver
vs Temperature
CURRENT
TEMPERATURE (°C)
20
with Shutdown
QUIESCENT
CC
5V Low Power
CURRENT
= 5V
40
60
LTC1382 • TA02
CC
LTC1382
is only 220 A
80
1.2
1.0
0.8
0.6
0.4
0.2
0
1

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LTC1382 Summary of contents

Page 1

... I drops to 0 The LTC1382 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120kbaud with a 2500pF, 3k load. Both driver outputs and receiver inputs can be forced to 25V without damage and can survive multiple 10kV ESD strikes ...

Page 2

... CC = 160 5V) OUT OUT OUT V OUT ORDER PART NUMBER TOP VIEW 1 18 ON/OFF NC LTC1382CN + LTC1382CS + 3 16 GND V – TR1 OUT + 5 14 RX1 IN – RX1 OUT – TR1 TR2 RX2 OUT ...

Page 3

... Supply Current vs Data Rate 2500pF DRIVERS ACTIVE 100 DATA RATE (kBAUD) UNITS UNITS 125 150 175 LTC1382 • TPC03 3 ...

Page 4

... DRIVER OUTPUT 2500pF L DRIVER OUTPUT INPUT LTC1382 • TPC08 Receiver Short-Circuit Current vs Temperature 50 40 – TEMPERATURE (°C) LTC1382 • TPC06 Receiver Output Waveforms RECEIVER OUTPUT C = 51pF L INPUT 60 70 LTC1382 • TPC09 ...

Page 5

... Outputs are in a high impedance state when in the Shutdown mode. – maintain 1.4V INPUT – OUTPUT V t HLD t LHR LTC1382 • F01 Figure 2. Receiver Propagation Delay Timing LTC1382 1.7V 1.3V 0.8V t HLR are 2.4V 0V LTC1382 • F02 5 ...

Page 6

... V CC 300k 11 8 LOGIC INPUT 13 14 LOGIC OUTPUT LOGIC OUTPUT ON/OFF LTC1382 • TA04 Receiver Timing Test Load RX OUTPUT RX INPUT RX 51pF LTC1382 • TA04 0.1 F 0.1 F 232 OUTPUT RS232 232 OUTPUT LINE PINS PROTECTED 232 INPUT TO ±10kV 232 INPUT ...

Page 7

... SEE NOTE 0.093 – 0.104 45 (2.362 – 2.642) 0° – 8° TYP 0.050 (1.270) TYP 0.014 – 0.019 (0.356 – 0.482) TYP LTC1382 0.905 MAX 0.065 (1.651) TYP 0.018 ± 0.003 (0.457 ± 0.076) N18 0392 0.447 – ...

Page 8

... LTC1382 NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" ...

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