Datasheet Linear Technology LT1342

Manufacturer	Linear Technology
Series	LT1342

5V RS232 Transceiver with 3V Logic Interface

Datasheets

PDF, 228 Kb, Revision: A, File uploaded: Nov 12, 2017

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Prices

Packaging

	LT1342CG#PBF	LT1342CG#TRPBF	LT1342CNW#PBF	LT1342CSW#PBF	LT1342CSW#TRPBF
N	1	2	3	4	5
Package	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	NW-28 Package Outline Drawing	SW-28 Package Outline Drawing	SW-28 Package Outline Drawing
Package Code	G	G	NW	SW	SW
Package Index	05-08-1640 (G28)	05-08-1640 (G28)	05-08-1520	05-08-1620 (SW28)	05-08-1620 (SW28)
Pin Count	28	28	28	28	28

Parametrics

Parameters / Models	LT1342CG#PBF	LT1342CG#TRPBF	LT1342CNW#PBF	LT1342CSW#PBF	LT1342CSW#TRPBF
Driver Disable	no	no	no	no	no
Drivers	3	3	3	3	3
ESD, kV	10	10	10	10	10
Export Control	no	no	no	no	no
IEC61000-4-2 Support	yes	yes	yes	yes	yes
Max Data Rate, Mbps	0.25	0.25	0.25	0.25	0.25
Operating Temperature Range, °C	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70
Power, mW	60	60	60	60	60
Protocols Supported	RS232	RS232	RS232	RS232	RS232
Receivers	5	5	5	5	5
Shutdown	yes	yes	yes	yes	yes
Supply Voltage Range	5V	5V	5V	5V	5V
Voltage Gen Components	6 x 0.1ВµF	6 x 0.1ВµF	6 x 0.1ВµF	6 x 0.1ВµF	6 x 0.1ВµF

Eco Plan

	LT1342CG#PBF	LT1342CG#TRPBF	LT1342CNW#PBF	LT1342CSW#PBF	LT1342CSW#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant

Design Notes

Download
RS232 Interface Circuits for 3.3V Systems &mdash DN75
PDF, 105 Kb, File published: Oct 1, 1993
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RS232 Interface Circuits for 3.3V Systems вЂ“ Design Note 75 Gary Maulding
The rapid, widespread use of 3.3V logic circuits complicates the selection of RS232 interface circuits. The
optimum choice of an interface circuit should be based
upon several application dependent factors:
1) Logic circuitry connected to interface chip port mouse. The LTВ®1342, LT1330, and LT1331 are all
good RS232 transceiver choices for systems with both
5V and 3V power. Typical performance waveforms for
the LT1342 operating with VCC = 5V and VL = 3.3V are
shown in Figure 2. 2) Power supply voltages available
RECEIVER
OUTPUT 3) Power consumption constraints
4) Serial interface environment
5) Mouse driving requirements
As Figure 1 illustrates, 5V interface circuits cannot be
used to directly connect to 3.3V CMOS logic circuits.
The receiver output level will forward bias the logic
circuitвЂ™s input protection diode, causing large current
п¬‚ow. In the worst case the CMOS logic circuit may
latch up. Resistor voltage dividers or level shift buffers may be used to prevent forward biasing the CMOS
input diode, but an RS232 transceiver designed for 3V
logic application prevents this problem without extra
components or power dissipation.
Many of todayвЂ™s systems have both 5V and 3V power …

Model Line

Series: LT1342 (5)

LT1342CG#PBF LT1342CG#TRPBF LT1342CNW#PBF LT1342CSW#PBF LT1342CSW#TRPBF

Manufacturer's Classification

Interface > RS232/RS562 Transceivers

EMS supplier

Slices

Microcontrollers