LTC491IS#TR datasheet, PDF - EEWORLD Datasheet

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LTC491IS#TR: DescriptionIC txrx rs485 low power 14-soic; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size179KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC491IS#TR Overview

IC txrx rs485 low power 14-soic

LTC491IS#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP14,.25
Contacts	14
Manufacturer packaging code	S
Reach Compliance Code	compli
ECCN code	EAR99
Other features	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN
Differential output	YES
Number of drives	1
Input properties	DIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit type	LINE TRANSCEIVER
Interface standards	EIA-422; EIA-485
JESD-30 code	R-PDSO-G14
JESD-609 code	e0
length	8.65 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	14
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Minimum output swing	1.5 V
Output characteristics	3-STATE
Maximum output low current	0.004 A
Output polarity	COMPLEMENTARY
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP14,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	235
power supply	5 V
Certification status	Not Qualified
Maximum receive delay	150 ns
Number of receiver bits	1
Maximum seat height	1.75 mm
Maximum slew rate	0.5 mA
Maximum supply voltage	5.25 V
Minimum supply voltage	4.75 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
maximum transmission delay	50 ns
width	3.9 mm

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LTC491

Differential Driver and

Receiver Pair

FEATURES

DESCRIPTIO

Low Power: I

= 300µA Typical

Designed for RS485 or RS422 Applications

Single 5V Supply

–7V to 12V Bus Common Mode Range

Permits

±7V

Ground Difference Between Devices

on the Bus

Thermal Shutdown Protection

Power-Up/-Down Glitch-Free Driver Outputs Permit

Live Insertion or Removal of Package

Driver Maintains High Impedance in Three-State or

with the Power Off

Combined Impedance of a Driver Output and

Receiver Allows up to 32 Transceivers on the Bus

70mV Typical Input Hysteresis

28ns Typical Driver Propagation Delays with 5ns

Skew for 2.5MB Operation

Pin Compatible with the SN75180

Available in 14-Lead PDIP and SO Packages

The LTC

491 is a low power differential bus/line trans-

ceiver designed for multipoint data transmission standard

RS485 applications with extended common mode range

(12V to –7V). It also meets the requirements of RS422.

The CMOS design offers significant power savings over its

bipolar counterpart without sacrificing ruggedness against

overload or ESD damage.

The driver and receiver feature three-state outputs, with

the driver outputs maintaining high impedance over the

entire common mode range. Excessive power dissipation

caused by bus contention or faults is prevented by a

thermal shutdown circuit which forces the driver outputs

into a high impedance state.

The receiver has a fail safe feature which guarantees a high

output state when the inputs are left open.

Both AC and DC specifications are guaranteed from 0°C to

70°C and 4.75V to 5.25V supply voltage range.

, LTC and LT are registered trademarks of Linear Technology Corporation.

APPLICATIO S

Low Power RS485/RS422 Transceiver

Level Translator

TYPICAL APPLICATIO

DRIVER

120Ω

4000 FT 24 GAUGE TWISTED PAIR

LTC491

RECEIVER

120Ω

4000 FT 24 GAUGE TWISTED PAIR

REB

120Ω

DRIVER

LTC491

120Ω

RECEIVER

REB

LTC491 • TA01

491fa

LTC491IS#TR Related Products

	LTC491IS#TR	LTC491CS#TR	LTC491CN#PBF	LTC491IS#TRPBF	LTC491IS#PBF	LTC491IN#PBF
Description	IC txrx rs485 low power 14-soic	IC txrx rs485 low power 14-soic	IC TXRX RS485 LOW POWER 14-DIP	IC TXRX RS485 LOW POWER 14-SOIC	IC TXRX RS485 LOW POWER 14-SOIC	IC TXRX RS485 LOW POWER 14-DIP
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	incompatible	incompatible	conform to	conform to	conform to	conform to
Parts packaging code	SOIC	SOIC	DIP	SOIC	SOIC	DIP
package instruction	SOP, SOP14,.25	SOP, SOP14,.25	DIP, DIP14,.3	SOP, SOP14,.25	SOP, SOP14,.25	DIP, DIP14,.3
Contacts	14	14	14	14	14	14
Manufacturer packaging code	S	S	N	S	S	N
Reach Compliance Code	compli	compli	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Other features	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN	TRISTATABLE RECEIVER; 1 RECEIVER ACTIVE UNDER SHUTDOWN
Differential output	YES	YES	YES	YES	YES	YES
Number of drives	1	1	1	1	1	1
Input properties	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit type	LINE TRANSCEIVER	LINE TRANSCEIVER	LINE TRANSCEIVER	LINE TRANSCEIVER	LINE TRANSCEIVER	LINE TRANSCEIVER
Interface standards	EIA-422; EIA-485	EIA-422; EIA-485	EIA-422; EIA-485	EIA-422; EIA-485	EIA-422; EIA-485	EIA-422; EIA-485
JESD-30 code	R-PDSO-G14	R-PDSO-G14	R-PDIP-T14	R-PDSO-G14	R-PDSO-G14	R-PDIP-T14
JESD-609 code	e0	e0	e3	e3	e3	e3
Humidity sensitivity level	1	1	1	1	1	1
Number of functions	1	1	1	1	1	1
Number of terminals	14	14	14	14	14	14
Maximum operating temperature	85 °C	70 °C	70 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-	-	-40 °C	-40 °C	-40 °C
Minimum output swing	1.5 V	1.5 V	1.5 V	1.5 V	1.5 V	1.5 V
Output characteristics	3-STATE	3-STATE	3-STATE	3-STATE	3-STATE	3-STATE
Maximum output low current	0.004 A	0.004 A	0.004 A	0.004 A	0.004 A	0.004 A
Output polarity	COMPLEMENTARY	COMPLEMENTARY	COMPLEMENTARY	COMPLEMENTARY	COMPLEMENTARY	COMPLEMENTARY
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	DIP	SOP	SOP	DIP
Encapsulate equivalent code	SOP14,.25	SOP14,.25	DIP14,.3	SOP14,.25	SOP14,.25	DIP14,.3
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE
Peak Reflow Temperature (Celsius)	235	235	NOT SPECIFIED	260	260	NOT SPECIFIED
power supply	5 V	5 V	5 V	5 V	5 V	5 V
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum receive delay	150 ns	150 ns	150 ns	150 ns	150 ns	150 ns
Number of receiver bits	1	1	1	1	1	1
Maximum seat height	1.75 mm	1.75 mm	3.809 mm	1.75 mm	1.75 mm	3.809 mm
Maximum slew rate	0.5 mA	0.5 mA	0.5 mA	0.5 mA	0.5 mA	0.5 mA
Maximum supply voltage	5.25 V	5.25 V	5.25 V	5.25 V	5.25 V	5.25 V
Minimum supply voltage	4.75 V	4.75 V	4.75 V	4.75 V	4.75 V	4.75 V
Nominal supply voltage	5 V	5 V	5 V	5 V	5 V	5 V
surface mount	YES	YES	NO	YES	YES	NO
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	COMMERCIAL	COMMERCIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	GULL WING	THROUGH-HOLE
Terminal pitch	1.27 mm	1.27 mm	2.54 mm	1.27 mm	1.27 mm	2.54 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	20	20	NOT SPECIFIED	30	30	NOT SPECIFIED
maximum transmission delay	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns
width	3.9 mm	3.9 mm	7.62 mm	3.9 mm	3.9 mm	7.62 mm
length	8.65 mm	8.65 mm	-	8.65 mm	8.65 mm	-

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