 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| DM74LS298 Quad 2-Port Register Multiplexer with Storage October 1988 Revised March 2000 DM74LS298 Quad 2-Port Register Multiplexer with Storage General Description The DM74LS298 is a quad 2-port register. It is the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit edge-triggered register. A Common Select input selects between two 4-bit input ports (data sources). The selected data is transferred to the output register synchronous with the HIGH-to-LOW transition of the Clock input. Features s Select from two data sources s Fully edge-triggered operation s Typical power dissipation of 65 mW Ordering Code: Order Number DM74LS298N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Logic Symbol Connection Diagram VCC = Pin 16 GND = Pin 8 Pin Descriptions Pin Names S CP I0a, I0d I1a, I1d Qa, Qd Description Common Select Inputs Clock Pulse Input (Active Falling Edge) Source 0 Data Inputs Source 1 Data Inputs Flip-Flip Outputs Truth Table Inputs S l l h h I0x l h X X I1x X X l h Output Qx L H L H 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 (c) 2000 Fairchild Semiconductor Corporation DS009826 www.fairchildsemi.com 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 (I nx) 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 www.fairchildsemi.com 2 DM74LS298 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0C to +70C -65C to +150C 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 Symbol VCC VIH VIL IOH IOL TA tS (H) tS (L) tH (H) tH (L) tS (H) tS (L) tH (H) tH (L) tW (H) tW (L) Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature Setup Time HIGH or LOW S to CP Hold Time HIGH or LOW S to CP Setup Time HIGH or LOW I0x or I1x to CP Hold Time HIGH or LOW I0x or I1x to CP CP Pulse Width HIGH or LOW 0 25 25 0 0 15 15 5.0 5.0 20 20 Parameter Min 4.75 2 0.8 -0.4 8 70 Nom 5 Max 5.25 Units V V V mA mA C ns ns ns ns ns Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max, VIL = Max VCC = Min, IOL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max, VI = 7V, VI = 10V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 3) VCC = Max, I0n, I1n, S = GND, CP = Note 2: All typicals are at VCC = 5V, TA = 25C. Min Typ (Note 2) 3.4 0.35 0.25 Max -1.5 Units V V 2.7 0.5 0.4 0.1 20 -0.4 V mA A mA mA mA -20 -100 21 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 = +25C Symbol tPLH Propagation Delay Time LOW-to-HIGH Level Output CP to Qn tPHL Propagation Delay Time HIGH-to-LOW Level Output CP to Qn 25 ns 25 ns Parameter RL = 2 k, CL = 15 pF Min Max Units 3 www.fairchildsemi.com 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 reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 4 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 |
Price & Availability of DM74LS298
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |