LT1780 datasheet, PDF - EEWORLD Datasheet

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LT1780: DescriptionLINE TRANSCEIVER, PDSO16; Categorysemiconductor Analog mixed-signal IC; File Size253KB，13 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LT1780 Overview

LINE TRANSCEIVER, PDSO16

LT1780 Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 Cel
Minimum operating temperature	0.0 Cel
Processing package description	Plastic, SO-16
state	ACTIVE
Craftsmanship	BIPOLAR
packaging shape	Rectangle
Package Size	SMALL OUTLINE
surface mount	Yes
Terminal form	GULL WING
Terminal spacing	1.27 mm
terminal coating	tin lead
Terminal location	pair
Packaging Materials	Plastic/Epoxy
Temperature level	COMMERCIAL
Max TPHL driver	1300 ns
Interface Type	line transceiver
Interface standards	GENERAL PURPOSE
Max TPHL receiver	600 ns
Number of drive digits	2
Input properties	Differential SCHMITT flip-flop
Number of receiver bits	2

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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

10mA Max Supply Current

ESD Protection to IEC 1000-4-2 Level 4

15kV Air Gap,

8kV Contact

Uses Small Capacitors: 0.1

120kBaud Operation for R

= 3k, C

= 2500pF

250kBaud Operation for R

= 3k, C

= 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

Portable Computers

Battery-Powered Systems

Power Supply Generator

Terminals

Modems

TYPICAL APPLICATI

0.1µF

LT1780

0.1µF

LOGIC

INPUTS

5V INPUT

OUT

0.1µF

–

OUT

0.1µF

DRIVER

OUTPUT

= 3k

= 2500pF

RS232 OUTPUT

RECEIVER

OUTPUT

= 50pF

RS232 OUTPUT

RS232 INPUT

INPUT

LOGIC

OUTPUTS

RS232 INPUT

ON/OFF

1780/81 • TA01

Output Waveforms

1780/81 • TA02

LT1780 Related Products

	LT1780	LT1780CN	LT1780CSW	LT1781	LT1781CN	LT1781CS	LT1781CSW
Description	LINE TRANSCEIVER, PDSO16	LINE TRANSCEIVER, PDSO16	LINE TRANSCEIVER, PDSO16	LINE TRANSCEIVER, PDSO16	LINE TRANSCEIVER, PDSO16	LINE TRANSCEIVER, PDSO16	LINE TRANSCEIVER, PDSO16
Number of functions	1	1	1	1	1	1	1
Number of terminals	16	18	18	16	16	16	16
Maximum operating temperature	70 Cel	70 °C	70 °C	70 Cel	70 °C	70 °C	70 °C
surface mount	Yes	NO	YES	Yes	NO	YES	YES
Terminal form	GULL WING	THROUGH-HOLE	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	GULL WING
Terminal location	pair	DUAL	DUAL	pair	DUAL	DUAL	DUAL
Temperature level	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Interface standards	GENERAL PURPOSE	EIA-232	GENERAL PURPOSE	GENERAL PURPOSE	EIA-232	GENERAL PURPOSE	GENERAL PURPOSE
Input properties	Differential SCHMITT flip-flop	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	Differential SCHMITT flip-flop	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER
Number of receiver bits	2	2	2	2	2	2	2
Brand Name	-	Linear Technology	Linear Technology	-	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	incompatible	incompatible	-	incompatible	incompatible	incompatible
Maker	-	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	-	DIP	SOIC	-	DIP	SOIC	SOIC
package instruction	-	DIP, DIP18,.3	SOP, SOP18,.4	-	DIP, DIP16,.3	PLASTIC, SO-16	SOP, SOP16,.4
Contacts	-	18	18	-	16	16	16
Manufacturer packaging code	-	N	SW	-	N	S	SW
Reach Compliance Code	-	_compli	_compli	-	_compli	_compli	_compli
ECCN code	-	EAR99	EAR99	-	EAR99	EAR99	EAR99
Is Samacsys	-	N	N	-	N	N	N
Differential output	-	NO	NO	-	NO	NO	NO
Number of drives	-	2	2	-	2	2	2
High level input current maximum value	-	0.00002 A	0.00002 A	-	0.00002 A	0.00002 A	0.00002 A
Interface integrated circuit type	-	LINE TRANSCEIVER	LINE TRANSCEIVER	-	LINE TRANSCEIVER	LINE TRANSCEIVER	LINE TRANSCEIVER
JESD-30 code	-	R-PDIP-T18	R-PDSO-G18	-	R-PDIP-T16	R-PDSO-G16	R-PDSO-G16
JESD-609 code	-	e0	e0	-	e0	e0	e0
Humidity sensitivity level	-	1	1	-	1	1	1
Minimum output swing	-	10 V	10 V	-	10 V	10 V	10 V
Maximum output low current	-	0.0016 A	0.0016 A	-	0.0016 A	0.0016 A	0.0016 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	DIP	SOP	-	DIP	SOP	SOP
Encapsulate equivalent code	-	DIP18,.3	SOP18,.4	-	DIP16,.3	SOP16,.25	SOP16,.4
Package shape	-	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	IN-LINE	SMALL OUTLINE	-	IN-LINE	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	-	NOT SPECIFIED	235	-	NOT SPECIFIED	235	235
power supply	-	5 V	5 V	-	5 V	5 V	5 V
Certification status	-	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified
Maximum receive delay	-	600 ns	600 ns	-	600 ns	600 ns	600 ns
Maximum seat height	-	3.937 mm	2.65 mm	-	3.937 mm	1.75 mm	2.65 mm
Maximum slew rate	-	14 mA	14 mA	-	14 mA	14 mA	14 mA
Nominal supply voltage	-	5 V	5 V	-	5 V	5 V	5 V
technology	-	BIPOLAR	BIPOLAR	-	BIPOLAR	BIPOLAR	BIPOLAR
Terminal surface	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal pitch	-	2.54 mm	1.27 mm	-	2.54 mm	1.27 mm	1.27 mm
Maximum time at peak reflow temperature	-	NOT SPECIFIED	20	-	NOT SPECIFIED	20	20
maximum transmission delay	-	1300 ns	1300 ns	-	1300 ns	1300 ns	1300 ns
width	-	7.62 mm	7.5 mm	-	7.62 mm	3.9 mm	7.5 mm
Base Number Matches	-	1	1	-	1	1	1

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