DM74LS243 FAIRCHILD | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 5

Technical content

Features

■ Two-way asynchronous communication between data buses ■ PNP inputs reduce DC loading on bus line ■ Hysteresis at data inputs improves noise margin Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table 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. Order Number Package Number Package Description DM74LS243M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow DM74LS243N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Control Data Port Inputs Status G AB GBA A B HH O I L H (Note 1) (Note 1) H L ISOLATED LL I O

www.fairchildsemi.com 2 DM74LS243 Absolute Maximum Ratings(Note 2) 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

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) Note 3: All typicals are at VCC = 5V, TA = 25°C. Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second. Supply Voltage 7V Input Voltage Any G 7V A or B 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units VCC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 24 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 3) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V HYS Hysteresis (V T+ − VT−)V CC = Min 0.2 0.4 V (Data Inputs Only) VOH HIGH Level Output Voltage V CC = Min, VIH = Min 2.7 VIL = Max, IOH = −1 mA VCC = Min, VIH = Min 2.4 3.4 V VIL = Max, IOH = −3 mA VCC = Min, VIH = Min 2 VIL = 0.5V, IOH = Max VOL LOW Level Output Voltage V CC = Min I OL = 12 mA 0.4 VIL = Max I OL = Max V VIH = Min 0.5 IOZH Off-State Output Current, V CC = Max V O = 2.7V 40 µA HIGH Level Voltage Applied V IL = Max IOZL Off-State Output Current, V IH = Min V O = 0.4V −200 µA LOW Level Voltage Applied II Input Current at Maximum V CC = Max V I = 5.5V A or B 0.1 mA Input Voltage V I = 7V Any G 0.1 mA IIH HIGH Level Input Current V CC = Max, VI = 2.7V 20 µA IIL LOW Level Input Current V CC = Max, VI = 0.4V −0.2 mA IOS Short Circuit Output Current V CC = Max (Note 4) −40 −225 mA ICC Supply Current V CC = Max Outputs HIGH 22 38 Outputs Outputs LOW 29 50 mA OPEN Outputs Disabled 32 54

3 www.fairchildsemi.com DM74LS243 Switching Characteristics at VCC = 5V, TA = 25°C Symbol Parameter Conditions Min Max Units tPLH Propagation Delay Time C L = 45 pF 18 ns LOW-to-HIGH Level Output R L = 667Ω tPHL Propagation Delay Time C L = 45 pF 18 ns HIGH-to-LOW Level Output R L = 667Ω tPZL Output Enable Time C L = 45 pF 30 ns to LOW Level R L = 667Ω tPZH Output Enable Time C L = 45 pF 23 ns to HIGH Level R L = 667Ω tPLZ Output Disable Time C L = 5 pF 25 ns from LOW Level R L = 667Ω tPHZ Output Disable Time C L = 5 pF 18 ns from HIGH Level R L = 667Ω tPLH Propagation Delay Time C L = 150 pF 21 ns LOW-to-HIGH Level Output R L = 667Ω tPHL Propagation Delay Time C L = 150 pF 22 ns HIGH-to-LOW Level Output R L = 667Ω tPZL Output Enable Time C L = 150 pF 33 ns to LOW Level R L = 667Ω tPZH Output Enable Time C L = 150 pF 26 ns to HIGH Level R L = 667Ω

www.fairchildsemi.com 4 DM74LS243 Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow Package Number M14A

5 www.fairchildsemi.com 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 rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com