74LS298

DM74LS298 FAIRCHILD | Alldatasheet

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Technical content

Features

■ Select from two data sources ■ Fully edge-triggered operation ■ Typical power dissipation of 65 mW Ordering Code: Logic Symbol VCC = Pin 16 GND = Pin 8 Pin Descriptions Connection Diagram Truth Table l = LOW Voltage Level one setup time prior to the HIGH-to-LOW clock transition. h = HIGH Voltage Level one setup time prior to the HIGH-to-LOW clock transition. H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Order Number Package Number Package Description DM74LS298N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Pin Names Description S Common Select Inputs CP Clock Pulse Input (Active Falling Edge) I0a, I0d Source 0 Data Inputs I1a, I1d Source 1 Data Inputs Q a, Qd Flip-Flip Outputs Inputs Output SI 0 x I1x Q x ll X L lh X H hX l L hX h H

www.fairchildsemi.com 2 DM74LS298 Functional Description This device is a high speed quad 2-port register. It selects four bits of data from two sources (ports) under the control of a Common Select input (S). The selected data is transferred to the 4-bit output register synchronous with the HIGH-to-LOW transition of the Clock input (CP ). The 4-bit output register is fully edge-triggered. The Data inputs (Inx) and Select input (S) need be stable only one setup time prior to the HIGH-to-LOW transition of the clock for predictable operation. Logic Diagram

3 www.fairchildsemi.com DM74LS298 Absolute Maximum Ratings(Note 1) Note 1: 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 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Switching Characteristics at VCC = +5V and TA = +25°C Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units V CC 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 −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 0 70 °C tS (H) Setup Time HIGH or LOW 25 nstS (L) S to CP 25 tH (H) Hold Time HIGH or LOW 0 nstH (L) S to CP 0 tS (H) Setup Time HIGH or LOW 15 nstS (L) I0 x or I1x to CP 15 tH (H) Hold Time HIGH or LOW 5.0 nstH (L) I0 x or I1x to CP 5.0 tW (H) CP Pulse Width HIGH or LOW 20 nstW (L) 20 Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V VOH HIGH Level Output Voltage V CC = Min, IOH = Max, VIL = Max 2.7 3.4 V VOL LOW Level Output Voltage V CC = Min, IOL = Max, VIH = Min 0.35 0.5 V IOL = 4 mA, VCC = Min 0.25 0.4 II Input Current @ Max Input Voltage VCC = Max, VI = 7V, VI = 10V 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 −0.4 mA IOS Short Circuit Output Current V CC = Max (Note 3) −20 −100 mA ICC Supply Current V CC = Max, I0n, I1n, 21 mA S = GND, CP = /c16 Symbol Parameter R L = 2 kΩ , CL = 15 pF Units Min Max tPLH Propagation Delay Time LOW-to-HIGH Level Output 25 ns CP to Qn tPHL Propagation Delay Time HIGH-to-LOW Level Output 25 ns CP to Qn

www.fairchildsemi.com 4 DM74LS298 Quad 2-Port Register Multiplexer with Storage Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E 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