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DM74LS243 Quadruple Bus Transceiver
August 1986 Revised January 2000
DM74LS243 Quadruple Bus Transceiver
General Description
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 133.
Features
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 DM74LS243M DM74LS243N Package Number M14A N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Function Table
Control Inputs G AB H L H L
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.
Data Port Status GBA H H L L I A O (Note 1) ISOLATED O B I (Note 1)
(c) 2000 Fairchild Semiconductor Corporation
DS006412
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DM74LS243
Absolute Maximum Ratings(Note 2)
Supply Voltage Input Voltage Any G A or B Operating Free Air Temperature Range Storage Temperature Range 7V 5.5V 0C to +70C -65C to +150C 7V
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
Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.75 2 0.8 -15 24 70 Nom 5 Max 5.25 Units V V V mA mA C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI HYS VOH Parameter Input Clamp Voltage Hysteresis (VT+ - VT-) (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 VIL = 0.5V, IOH = Max VOL LOW Level Output Voltage VCC = Min VIL = Max VIH = Min IOZH IOZL II IIH IIL IOS ICC Off-State Output Current, HIGH Level Voltage Applied Off-State Output Current, LOW Level Voltage Applied Input Current at Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current VCC = Max VI = 5.5V VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 4) VCC = Max Outputs OPEN
Note 3: All typicals are at VCC = 5V, TA = 25C. Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Conditions VCC = Min, II = -18 mA VCC = Min
Min
Typ (Note 3) 0.4
Max -1.5
Units V V
0.2 2.7 2.4 2
3.4
V
IOL = 12 mA IOL = Max
0.4 V 0.5 40 -200 A or B Any G 0.1 0.1 20 -0.2 -40 22 29 32 -225 38 50 54 mA A A mA mA A mA mA
VCC = Max VIL = Max VIH = Min
VO = 2.7V VO = 0.4V
Outputs HIGH Outputs LOW Outputs Disabled
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DM74LS243
Switching Characteristics
at VCC = 5V, TA = 25C Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tPLH tPHL tPZL tPZH Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to LOW Level Output Enable Time to HIGH Level Output Disable Time from LOW Level Output Disable Time from HIGH Level Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to LOW Level Output Enable Time to HIGH Level CL = 45 pF RL = 667 CL = 45 pF RL = 667 CL = 45 pF RL = 667 CL = 45 pF RL = 667 CL = 5 pF RL = 667 CL = 5 pF RL = 667 CL = 150 pF RL = 667 CL = 150 pF RL = 667 CL = 150 pF RL = 667 CL = 150 pF RL = 667 Conditions Min Max 18 18 30 23 25 18 21 22 33 26 Units ns ns ns ns ns ns ns ns ns ns
3
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DM74LS243
Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow Package Number M14A
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DM74LS243 Quadruple Bus Transceiver
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N14A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 5 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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