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| DM74ALS874B Dual 4-Bit D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs April 1984 Revised February 2000 DM74ALS874B Dual 4-Bit D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs General Description This dual 4-bit register features totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. The high-impedance state and increased high-logic-level drive provide this register with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pull-up components. It is particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight flip-flops of the DM74ALS874B are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs will be set to the logic states that were set up at the D inputs. A buffered output control input can be used to place the eight outputs in either a normal logic state (HIGH or LOW logic levels) or a high-impedance state. In the high-impedance state the outputs neither load nor drive the bus lines significantly. The output control does not affect the internal operation of the flip-flops. That is, the old data can be retained or new data can be entered even while the outputs are OFF. Features s Switching specifications at 50 pF s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process s 3-STATE buffer-type outputs drive bus lines directly s Space saving 300 mil wide package s Asynchronous clear Ordering Code: Order Number DM74ALS874BWM DM74ALS874BNT Package Number M24B N24C Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram (c) 2000 Fairchild Semiconductor Corporation DS006244 www.fairchildsemi.com DM74ALS874B Function Table Inputs CLR X L H H H D X X H L X CLK X X L OC H L L L L Output Q Z L H L Q0 Logic Diagram L = LOW State H = HIGH State X = Don't Care = Positive Edge Transition Z = High Impedance State Q0 = Previous Condition of Q www.fairchildsemi.com 2 DM74ALS874B Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 51.0C/W 86.5C/W 7V 7V 5.5V 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 fCLK tWCLK tWCLR tSU tH tSU TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Clock Frequency Width of Clock Pulse Width of Clear Pulse Data Setup Time (Note 2) Data Hold Time (Note 2) Clear Inactive Free Air Operating Temperature HIGH LOW LOW 0 16.5 16.5 10 15 0 12 0 70 Parameter Min 4.5 2 0.8 -2.6 24 30 Nom 5 Max 5.5 Units V V V mA mA MHz ns ns ns ns ns ns C Note 2: The () arrow indicates the positive edge of the Clock is used for reference. 3 www.fairchildsemi.com DM74ALS874B Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VOL LOW Level Output Voltage II IIH IIL IO IOZH IOZL ICC Input Current @Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current OFF-State Output Current HIGH Level Voltage Applied OFF-State Output Current LOW Level Voltage Applied Supply Current VCC = 4.5V VIL = VIL Max VCC = 4.5V to 5.5V VCC = 4.5V VIH = 2V Conditions VCC = 4.5V, II = -18 mA IOH = Max IOH = -400 A IOL = 12 mA IOL = 24 mA VCC = 5.5V, VIH = 7V VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V, VIH = 2V VO = 2.7V VCC = 5.5V, VIH = 2V VO = 0.4V VCC = 5.5V Outputs OPEN Outputs HIGH Outputs LOW Outputs Disabled 14 19 20 -30 2.4 VCC - 2 0.25 0.35 0.4 0.5 0.1 20 -0.2 -112 20 -20 21 30 32 3.2 Min Typ Max -1.2 Units V V V V V mA A mA mA A A mA mA mA Switching Characteristics over recommended operating free air temperature range. Symbol fMAX tPLH tPHL tPZH tPZL tPHZ tPLZ tPHL Parameter Maximum Clock Frequency Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output Output Disable Time from LOW Level Output Propagation Delay Time HIGH-to-LOW Level Output Conditions VCC = 4.5V to 5.5V RL = 500,, CL = 50 pF Clock Clock Output Control Output Control Output Control Output Control Clear Any Q Any Q Any Q Any Q Any Q Any Q Any Q From To Min 30 4 4 4 4 2 3 5 Max MHz 14 14 18 18 10 12 17 ns ns ns ns ns ns ns Units www.fairchildsemi.com 4 DM74ALS874B Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M24B 5 www.fairchildsemi.com DM74ALS874B Dual 4-Bit D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide Package Number N24C 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 6 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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