LTC1338 Linear Technology, LTC1338 Datasheet

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LTC1338

Manufacturer Part Number
LTC1338
Description
5V Low Power RS232 5-Driver/3-Receiver Transceiver
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
0.1 F
C1
PPLICATI
Low Supply Current: 500 A
0.2 A Supply Current in SHUTDOWN
50 A Supply Current in RECEIVER ALIVE Mode
ESD Protection Over 10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1 F
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
Flowthrough Architecture
Battery-Powered Modems
Battery-Powered DCE
Notebook Computers
Palmtop Computers
DRIVER 1 OUT
DRIVER 2 OUT
DRIVER 3 OUT
DRIVER 4 OUT
DRIVER 5 OUT
0.1 F
5-Drivers/3-Receivers with SHUTDOWN
RX ENABLE
C2
RX3 IN
RX1 IN
RX2 IN
S
A
V
NC
O
PPLICATI
V
CC
+
U
10
11
12
13
14
1
2
3
4
5
6
7
8
9
S
LTC1338
O
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DRIVER 1 IN
DRIVER 2 IN
RX1 OUT
DRIVER 3 IN
RX2 OUT
DRIVER 4 IN
RX3 OUT
DRIVER 5 IN
V
GND
DRIVER ENABLE
NC
C3
0.1 F
LTC1338 • TA01
5-Driver/3-Receiver Transceiver
C4
0.1 F
D
The LTC1338 is a 5-driver/ 3-receiver RS232 trans-
ceiver with very low supply current. In the no load
condition, the supply current is only 500 A. The charge
pump only requires four 0.1 F capacitors.
In SHUTDOWN mode, the supply current is further
reduced to 0.2 A. In RECEIVER ALIVE mode, all three
receivers are kept alive and the supply current is 50 A.
All RS232 outputs assume a high impedance state in
SHUTDOWN and with the power off.
The LTC1338 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 2500pF, 3k load. Both
driver outputs and receiver inputs can be forced to
ESD strikes.
25V without damage, and can survive multiple 10kV
ESCRIPTIO
TEST CONDITION:
V
CC
1200
1000
800
600
400
200
= 5V, ALL DRIVER INPUTS TIED TO V
0
–40
5V Low Power RS232
–20
U
SHUTDOWN
QUIESCENT
CURRENT
CURRENT
Supply Current
0
TEMPERATURE (°C)
20
40
60
CC
.
80
LTC1338
LTC1338 • TA02
100
1.2
1.0
0.8
0.6
0.4
0.2
0
1

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LTC1338 Summary of contents

Page 1

... A. All RS232 outputs assume a high impedance state in SHUTDOWN and with the power off. The LTC1338 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud with a 2500pF, 3k load. Both ...

Page 2

... V ................................................................... 30 sec – V ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range Commercial (LTC1338C) ........................ Industrial (LTC1338I) ........................ – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 ELECTRICAL C HARA TERISTICS PARAMETER CONDITIONS Any Driver ...

Page 3

... DRIVER ENABLE RECEIVER ENABLE Supply Current vs Data Rate 2500pF L 5 DRIVERS ACTIVE 100 DATA RATE (k BAUD) UNITS UNITS 100 120 140 LTC1338 • TPC03 3 ...

Page 4

... TEMPERATURE (°C) Receiver Output Waveforms RECEIVER OUTPUT C = 50pF L INPUT + – and V pins may be paral- + – Commutating Capacitor Inputs. These + – , and another from maintain 80 100 LTC1338 • TPC06 LTC1338 • TPC09 – ...

Page 5

... CC RX 1.4V INPUT OUTPUT – LHR HLD LTC1338 • F01 Figure 2. Receiver Propagation Delay Timing LTC1338 RECEIVERS I ( A)(TYP) CC All receiver outputs are 0.2 high impedance. All receiver outputs are 500 high impedance. All receivers alive. 50 All receivers alive. 500 1 ...

Page 6

... DRIVER 3 OUT RX2 OUT 9 20 RX2 IN DRIVER DRIVER 4 OUT RX3 OUT 11 18 RX3 IN DRIVER DRIVER 5 OUT ENABLE Receiver Timing Test Load RX OUTPUT RX INPUT RX 51pF LTC1338 • F04 – 0.1 F GND DRIVER ENABLE NC LTC1338 • TC01 ...

Page 7

... S Package 28-Lead SOL 0.037 – 0.045 (0.940 – 1.143) 0.050 0.014 – 0.019 0.004 – 0.012 (1.270) (0.356 – 0.482) (0.102 – 0.305) TYP LTC1338 0.397 – 0.407* (10.07 – 10.33 0.301 – 0.311 0.045 (7.65 – ...

Page 8

... LTC1338 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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