PDF 7474 Data sheet ( Hoja de datos )

Número de pieza	7474
Descripción	Dual Positive-Edge-Triggered D-Type Flip-Flops
Fabricantes	Fairchild
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No Preview Available ! September 1986 Revised July 2001 DM7474 Dual Positive-Edge-Triggered D-Type Flip-Flops with Preset, Clear and Complementary Outputs General Description This device contains two independent positive-edge-trig- gered D-type flip-flops with complementary outputs. The information on the D input is accepted by the flip-flops on the positive going edge of the clock pulse. The triggering occurs at a voltage level and is not directly related to the transition time of the rising edge of the clock. The data on the D input may be changed while the clock is LOW or HIGH without affecting the outputs as long as the data setup and hold times are not violated. A LOW logic level on the preset or clear inputs will set or reset the outputs regardless of the logic levels of the other inputs. Ordering Code: Order Number Package Number Package Description DM7474M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow DM7474N N14A 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 Inputs Outputs PR CLR CLK D Q Q LHXXHL HLXXLH L L XXHH (Note 1) (Note 1) HH ↑ HH L HH↑ L LH H H L X Q0 Q0 H = HIGH Logic Level X = Either LOW or HIGH Logic Level L = LOW Logic Level ↑ = Positive-going transition of the clock. Q0 = The output logic level of Q before the indicated input conditions were established. Note 1: This configuration is nonstable; that is, it will not persist when either the preset and/or clear inputs return to their inactive (HIGH) level. © 2001 Fairchild Semiconductor Corporation DS006526 www.fairchildsemi.com 1 page 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 5 www.fairchildsemi.com 5 Page

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