Revised February 2000 DM74ALS574A Octal D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs General Description Features These 8-bit registers feature 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 these registers 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. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. ■ Switching specifications at 50 pF The eight flip-flops of the DM74ALS574A 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. ■ Switching specifications guaranteed over full temperature and VCC range ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Functionally equivalent with DM74LS374 ■ Improved AC performance over DM74LS374 at approximately half the power ■ 3-STATE buffer-type outputs drive bus lines directly 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. Ordering Code: Order Number Package Number DM74ALS574AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Description DM74ALS574ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74ALS574AN N20A 20-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 © 2000 Fairchild Semiconductor Corporation DS006110 www.fairchildsemi.com DM74ALS574A Octal D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs September 1986 DM74ALS574A Function Table Logic Diagram Output Output Clock D Control Q L ↑ H L ↑ L L L L X Q0 H X X Z H 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 Supply Voltage 7V Input Voltage 7V Voltage Applied to Disabled Output 5.5V 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. 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Typical θJA N Package 56.0°C/W M Package 75.0°C/W Recommended Operating Conditions Symbol Parameter Min Nom Max 4.5 5 5.5 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −2.6 mA IOL LOW Level Output Current fCLOCK Clock Frequency tW Width of Clock Pulse tSU Data Setup Time tH Data Hold Time TA Free Air Operating Temperature 2 V 0 24 mA 35 MHz HIGH 14 LOW 14 ns ns (Note 2) 15 ↑ ns (Note 2) 0↑ ns 0 °C 70 Note 2: The (↑) arrow indicates the positive edge of the Clock is used for reference. Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, II = −18 mA VOH HIGH Level VCC = 4.5V Output Voltage VIL = VIL Max IOH = Max VCC = 4.5V to 5.5V VOL LOW Level VCC = 4.5V Output Voltage VIH = 2V Min IOH = −400 µA 2.4 Typ Max Units −1.2 V 3.2 V VCC − 2 V IOL = 12 mA 0.25 0.4 V IOL = 24 mA 0.35 0.5 V 0.1 mA II Input Current at Max Input Voltage VCC = 5.5V, VIH = 7V IIH HIGH Level Input Current VCC = 5.5V, VIH = 2.7V 20 µA IIL LOW Level Input Current VCC = 5.5V, VIL = 0.4V −0.2 mA IO Output Drive Current VCC = 5.5V, VO = 2.25V −112 mA IOZH OFF-State Output Current VCC = 5.5V, VIH = 2V HIGH Level Voltage Applied VO = 2.7V 20 µA −20 µA IOZL ICC OFF-State Output Current d VCC = 5.5V, VIH = 2V LOW Level Voltage Applied VO = 0.4V Supply Current −30 VCC = 5.5V Outputs HIGH 11 18 mA Outputs Open Outputs LOW 17 27 mA Outputs Disabled 17 28 mA 3 www.fairchildsemi.com DM74ALS574A Absolute Maximum Ratings(Note 1) DM74ALS574A Switching Characteristics over recommended operating free air temperature range Symbol Parameter Conditions fMAX Maximum Clock Frequency VCC = 4.5V to 5.5V tPLH Propagation Delay Time RL = 500Ω LOW-to-HIGH Level Output CL = 50 pF tPHL From Propagation Delay Time Output Enable Time to HIGH Level Output tPZL Output Enable Time to LOW Level Output tPHZ Output Disable Time from HIGH Level Output tPLZ Output Disable Time from LOW Level Output www.fairchildsemi.com Min Max 35 HIGH-to-LOW Level Output tPZH To 4 Units MHz Clock Any Q 4 14 ns Clock Any Q 4 14 ns Output Control Any Q 4 18 ns Output Control Any Q 4 18 ns Output Control Any Q 2 10 ns Output Control Any Q 2 12 ns DM74ALS574A Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B 5 www.fairchildsemi.com DM74ALS574A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D www.fairchildsemi.com 6 DM74ALS574A Octal D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A 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. 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