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LT1780CN#PBF

Description
IC DVR/RCVR 5V RS232 DUAL 18-DIP
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size243KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT1780CN#PBF Overview

IC DVR/RCVR 5V RS232 DUAL 18-DIP

LT1780CN#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeDIP
package instructionDIP, DIP18,.3
Contacts18
Manufacturer packaging codeN
Reach Compliance Codecompliant
ECCN codeEAR99
Is SamacsysN
Differential outputNO
Number of drives2
High level input current maximum value0.00002 A
Input propertiesDIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit typeLINE TRANSCEIVER
Interface standardsEIA-232
JESD-30 codeR-PDIP-T18
JESD-609 codee3
Humidity sensitivity level1
Number of functions1
Number of terminals18
Maximum operating temperature70 °C
Minimum operating temperature
Minimum output swing10 V
Maximum output low current0.0016 A
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP18,.3
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply5 V
Certification statusNot Qualified
Maximum receive delay600 ns
Number of receiver bits2
Maximum seat height3.937 mm
Maximum slew rate14 mA
Nominal supply voltage5 V
surface mountNO
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
maximum transmission delay1300 ns
width7.62 mm
Base Number Matches1
LT1780/LT1781
Low Power 5V RS232
Dual Driver/Receiver with
±15kV
ESD Protection
DESCRIPTIO
The LT
®
1780/LT1781 are dual RS232 driver/receiver pairs
with integral charge pump to generate RS232 voltage
levels from a single 5V supply. Using only 0.1µF external
capacitors, these circuits consume only 40mW of power,
and can operate to 120kbaud even while driving heavy
capacitive loads. New ESD structures on the chip allow the
LT1780/LT1781 to survive
±15kV
air gap and
±8kV
con-
tact ESD tests per IEC 1000-4-2, eliminating the need for
costly TransZorbs
®
on the RS232 line pins. The LT1780/
LT1781 are fully compliant with EIA RS232 standards.
Driver outputs are protected from overload, and can be
shorted to ground or up to
±30V
without damage. During
SHUTDOWN or power-off conditions, driver and receiver
outputs are in a high impedance state, allowing line
sharing.
The LT1780/LT1781 are direct upgrades to the LT1180A/
LT1181A, LT1280A/LT1281A and LT1381 for applications
which require the utmost ESD protection.
The LT1781 is available in 16-pin DIP,SO and SW pack-
ages. The LT1780 is supplied in 18-pin DIP and SW
packages for applications which require SHUTDOWN.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
10mA Max Supply Current
ESD Protection to IEC 1000-4-2 Level 4
±
15kV Air Gap,
±
8kV Contact
Uses Small Capacitors: 0.1
µ
F
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
Outputs Withstand
±30V
Without Damage
CMOS Comparable Low Power: 40mW
Operates from a Single 5V Supply
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Meets All RS232 Specifications
Available With or Without Shutdown
Absolutely No Latch-up
APPLICATI
s
s
s
s
s
S
Portable Computers
Battery-Powered Systems
Power Supply Generator
Terminals
Modems
TYPICAL APPLICATI
2
0.1µF
4
LT1780
5
0.1µF
6
12
LOGIC
INPUTS
7
3
17
5V INPUT
V
+
OUT
0.1µF
V
OUT
0.1µF
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
15
RS232 OUTPUT
11
13
8
14
5k
RECEIVER
OUTPUT
R
C
L
= 50pF
RS232 OUTPUT
RS232 INPUT
INPUT
LOGIC
OUTPUTS
10
18
9
5k
16
RS232 INPUT
ON/OFF
1780/81 • TA01
U
UO
UO
Output Waveforms
1780/81 • TA02
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