DM74LS243N

DM74LS243N Datasheet

DM74LS243 Quadruple Bus Transceiver

Part	Datasheet
DM74LS243N	DM74LS243N (pdf)

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DM74LS243 Quadruple Bus Transceiver DM74LS243 Quadruple Bus Transceiver This four data line transceiver is designed for asynchronous two-way communications between data buses. It can be used to drive terminated lines down to s Two-way asynchronous communication between data buses s PNP inputs reduce DC loading on bus line s Hysteresis at data inputs improves noise margin Ordering Code: Order Number Package Number Package Description DM74LS243M M14A 14-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-120, Narrow DM74LS243N N14A 14-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Control Data Port Inputs Status Note 1 Note 1 ISOLATED I = Input O = Output H = HIGH Logic Level L = LOW Logic Level Note 1 Possibly destructive oscillation may occur if the transceivers are enabled in both directions at once. 2000 Fairchild Semiconductor Corporation DS006412 DM74LS243 Absolute Maximum Ratings Note 2 Supply Voltage Input Voltage Any G A or B 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Note 2 The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions VCC VIH VIL IOH IOL TA Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature Electrical Characteristics over recommended operating free air temperature range unless otherwise noted Parameter Conditions Input Clamp Voltage VCC = Min, II = −18 mA Hysteresis VT+ − VT− VCC = Min Data Inputs Only HIGH Level Output Voltage VCC = Min, VIH = Min VIL = Max, IOH = −1 mA VCC = Min, VIH = Min VIL = Max, IOH = −3 mA VCC = Min, VIH = Min

PDF Datasheet Preview

DM74LS243 Quadruple Bus Transceiver

DM74LS243 Quadruple Bus Transceiver

This four data line transceiver is designed for asynchronous two-way communications between data buses. It can be used to drive terminated lines down to
s Two-way asynchronous communication between data buses
s PNP inputs reduce DC loading on bus line s Hysteresis at data inputs improves noise margin
Ordering Code:

Order Number Package Number

Package Description

DM74LS243M

M14A
14-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-120, Narrow

DM74LS243N

N14A
14-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Function Table

Control

Data Port

Inputs

Status

Note 1 Note 1

ISOLATED

I = Input O = Output H = HIGH Logic Level L = LOW Logic Level

Note 1 Possibly destructive oscillation may occur if the transceivers are enabled in both directions at once.
2000 Fairchild Semiconductor Corporation DS006412

DM74LS243

Absolute Maximum Ratings Note 2

Supply Voltage

Input Voltage

Any G

A or B
5.5V

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range
−65°C to +150°C

Note 2 The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

Recommended Operating Conditions

VCC VIH VIL IOH IOL TA

Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature

Electrical Characteristics
over recommended operating free air temperature range unless otherwise noted

Parameter

Conditions

Input Clamp Voltage

VCC = Min, II = −18 mA

Hysteresis VT+ − VT−

VCC = Min

Data Inputs Only

HIGH Level Output Voltage

VCC = Min, VIH = Min

VIL = Max, IOH = −1 mA

VCC = Min, VIH = Min

VIL = Max, IOH = −3 mA

VCC = Min, VIH = Min

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Datasheet ID: DM74LS243N 513780