54ACT399 Quad 2-Port Register General Description Features The ’AC/ACT399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flop on the rising edge of the clock. n n n n n Logic Symbols Connection Diagrams ICC reduced by 50% Select inputs from two data sources Fully positive edge-triggered operation Outputs source/sink 24 mA ACT399 has TTL-compatible inputs Pin Assignment for DIP and Flatpak DS100356-1 IEEE/IEC DS100356-3 Pin Assignment for LCC DS100356-5 DS100356-2 Pin Names S Description Common Select Input CP Clock Pulse Input I0a–I 0d Data Inputs from Source 0 I1a–I1d Data Inputs from Source 1 Qa–Qd Register True Outputs TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT ® is a registered trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100356 www.national.com 54ACT399 Quad 2-Port Register August 1998 Functional Description Function Table The ’AC/ACT399 is a high-speed quad 2-port register. It selects four bits of data from either of two sources (Ports) under control of a common Select input (S). The selected data is transferred to a 4-bit output register synchronous with the LOW-to-HIGH transition of the Clock input (CP). The 4-bit D-type output register is fully edge-triggered. The Data inputs (I0x, I1x) and Select input (S) must be stable only a setup time prior to and hold time after the LOW-to-HIGH transition of the Clock input for predictable operation. Inputs Outputs S I0 I1 CP Q Q L L X N L H L H X N H L H X L N L H H X H N H L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial N = LOW-to-HIGH Clock Transition Logic Diagram DS100356-4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 Absolute Maximum Ratings (Note 1) Junction Temperature (TJ) CDIP If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = −0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = −0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND ) Storage Temperature (TSTG) +175˚C Recommended Operating Conditions −0.5V to +7.0V Supply Voltage (VCC) ’ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54ACT Minimum Input Edge Rate (∆V/∆t) ’ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V −20 mA +20 mA −0.5V to VCC + 0.5V −20 mA +20 mA −0.5V to VCC + 0.5V ± 50 mA 4.5V to 5.5V 0V to VCC 0V to VCC −55˚C to +125˚C 125 mV/ns Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation of FACT ® circuits outside databook specifications. ± 50 mA −65˚C to +150˚C DC Electrical Characteristics for ’ACT Family Devices Symbol Parameter 54ACT TA = −55˚C to +125˚C VCC (V) VIH VIL VOH Units Conditions Guaranteed Limits Minimum High Level 4.5 2.0 Input Voltage 5.5 2.0 Maximum Low Level 4.5 0.8 Input Voltage 5.5 0.8 Minimum High Level 4.5 4.4 5.5 5.4 V VOUT = 0.1V V or VCC −0.1V VOUT = 0.1V V or VCC − 0.1V IOUT = −50 µA (Note 2) VIN = VIL or VIH VOL 4.5 3.70 5.5 4.70 Maximum Low Level 4.5 0.1 Output Voltage 5.5 0.1 V IOH = −24 mA V IOH = −24 mA IOUT = 50 µA (Note 2) VIN = VIL or VIH IIN Maximum Input 4.5 0.50 5.5 0.50 V IOL = 24 mA ± 1.0 µA IOL = 24 mA VI = VCC, GND 5.5 Leakage Current ICCT Maximum ICC/Input 5.5 1.6 mA IOLD Minimum Dynamic (Note 3) 5.5 50 mA IOHD Output Current 5.5 −50 mA ICC Maximum Quiescent 5.5 80.0 µA Supply Current VI = VCC −2.1V VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or Ground Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. 3 www.national.com AC Electrical Characteristics 54ACT TA, VCC = Mil CL = 50 pF VCC Symbol Parameter (V) Fig. Units No. (Note 4) Min Max fmax Input Clock Frequency 5.0 90 tPLH Propagation Delay 5.0 1.5 10.0 ns 5.0 1.5 10.0 ns MHz CP to Q tPHL Propagation Delay CP to Q Note 4: Voltage Range 5.0 is 5.0V ± 0.5V AC Operating Requirements VCC Symbol Parameter (V) (Note 5) 54ACT TA = −55˚C Units to +125˚C CL = 50 pF No. Guaranteed Minimum ts Setup Time, HIGH or LOW 5.0 3.5 ns 5.0 3.0 ns 5.0 6.0 ns 5.0 2.5 ns 5.0 5.0 ns In to CP th Hold Time, HIGH or LOW In to CP ts Setup Time, HIGH or LOW S to CP th Hold Time, HIGH or LOW S to CP tw CP Pulse Width, HIGH or LOW Note 5: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Symbol Typ Units CIN Input Capacitance Parameter 4.5 pF CPD Power Dissipation Capacitance 30 pF www.national.com 4 Conditions VCC = OPEN VCC = 5.0V Fig. Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A 5 www.national.com 54ACT399 Quad 2-Port Register Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Ceramic Flatpak (IF) NS Package Number W16A LIFE SUPPORT POLICY NATIONAL’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 NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure 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. 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