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| 74ACT652 Transceiver/Register August 1999 Revised September 2000 74ACT652 Transceiver/Register General Description The ACT652 consists of bus transceiver circuits with Dtype flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to the HIGH logic level. Output Enable pins (OEAB, OEBA) are provided to control the transceiver function. Features s Independent registers for A and B buses s Multiplexed real-time and stored data s Outputs source/sink 24 mA s TTL-compatible inputs Ordering Code: Order Number 74ACT652SC 74ACT652MTC 74ACT652SPC Package Number M24B MTC24 N24C Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code. Logic Symbols IEEE/IEC Connection Diagram Pin Descriptions Pin Names A0-A7, B0-B7 CPAB, CPBA SAB, SBA OEAB, OEBA Description A and B Inputs/3-STATE Outputs Clock Inputs Select Inputs Output Enable Inputs FACT is a trademark of Fairchild Semiconductor Corporation. (c) 2000 Fairchild Semiconductor Corporation DS500310 www.fairchildsemi.com 74ACT652 Function Table Inputs OEAB L L X H L L L L H H H OEBA H H H H X L L L H H L CPAB H or L CPBA H or L SAB X X X X X X X X L H H SBA X X X X X X L H X X H Output Output Input Output Input Input Not Specified Output Output Not Specified Output Input Input Input Inputs/Outputs (Note 1) A0 thru A7 Input B0 thru B7 Input Isolation Store A and B Data Store A, Hold B Store A in Both Registers Hold A, Store B Store B in Both Registers Real-Time B Data to A Bus Store B Data to A Bus Real-Time A Data to B Bus Stored A Data to B Bus Stored A Data to B Bus and Stored B Data to A Bus H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Clock Transition Operating Mode H or L X X X H or L X X X H or L H or L H or L H or L Note 1: The data output functions may be enabled or disabled by various signals at OEAB or OEBA inputs. Data input functions are always enabled, i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs. Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 74ACT652 Functional Description In the transceiver mode, data present at the HIGH impedance port may be stored in either the A or B register or both. The select (SAB, SBA) controls can multiplex stored and real-time. The examples in Figure 1 demonstrate the four fundamental bus-management functions that can be performed with the Octal bus transceivers and receivers. Data on the A or B data bus, or both can be stored in the internal D-type flip-flop by LOW to HIGH transitions at the appropriate Clock Inputs (CPAB, CPBA) regardless of the Select or Output Enable Inputs. When SAB and SBA are in the real time transfer mode, it is also possible to store data without using the internal D-type flip-flops by simultaneously enabling OEAB and OEBA. In this configuration each Output reinforces its Input. Thus when all other data sources to the two sets of bus lines are in a HIGH impedance state, each set of bus lines will remain at its last state. Note B: Real-Time Transfer Bus A to Bus B Note A: Real-Time Transfer Bus B to Bus A OEAB L OEBA L CPAB X CPBA X SAB X SBA L OEAB H OEBA H CPAB X CPBA X SAB L SBA X Note C: Storage Note D: Transfer Storage Data to A or B OEAB X L L OEBA H X H CPAB X CPBA SAB X X X SBA X X X FIGURE 1. OEAB H OEBA L CPAB H or L CPBA H or L SAB H SBA H X 3 www.fairchildsemi.com 74ACT652 Absolute Maximum Ratings(Note 2) 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) DC Latch-Up Source or Sink Current Junction Temperature (TJ) PDIP 140C -0.5V to +7.0V -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA +20 mA -0.5V to VCC + 0.5V 50 mA 50 mA -65C to +150C 300 mA Recommended Operating Conditions Supply Voltage (VCC) Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) Minimum Input Edge Rate V/t VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V 125 mV/ns 4.5V to 5.5V 0V to VCC 0V to VCC -40C to +85C Note 2: 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. Fairchild does not recommend operation of FACT circuits outside databook specifications. DC Electrical Characteristics Symbol VIH VIL VOH Parameter Minimum HIGH Level Input Voltage Maximum LOW Level Input Voltage Minimum HIGH Level Output Voltage VCC (V) 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum LOW Level Output Voltage 4.5 5.5 4.5 5.5 IIN IOZT ICCT IOLD IOHD ICC Maximum Input Leakage Current Maximum I/O Leakage Current Maximum ICC/Input Minimum Dynamic Output Current (Note 4) Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 5.5 8.0 0.6 0.001 0.001 TA = +25C Typ 1.5 1.5 1.5 1.5 4.49 5.49 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 0.1 0.6 TA = -40C to +85C Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1.0 6.0 1.5 75 -75 80.0 A A mA mA mA A V Units V V V Conditions VOUT = 0.1V or VCC - 0.1V VOUT = 0.1V or VCC - 0.1V IOUT = -50 A VIN = VIL or VIH V IOH = -24 mA IOH = -24 mA (Note 3) IOUT = 50 A VIN = VIL or VIH V IOL = 24 mA IOL = 24 mA (Note 3) VI = VCC, GND VI = VIL, VIH VO = VCC, GND VI = VCC - 2.1V VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND Note 3: All outputs loaded; thresholds on input associated with output under test. Note 4: Maximum test duration 2.0 ms, one output loaded at a time. www.fairchildsemi.com 4 74ACT652 AC Electrical Characteristics VCC Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ ts(H) ts(L) th(H) th(L) tw(H) tw(L) Parameter Max. Clock Frequency Propagation Delay Clock to Bus Propagation Delay Bus to Bus Propagation Delay SBA or SAB to A or B Enable Time OEBA to A (Note 5) Disable Time OEBA to A (Note 5) Enable Time OEAB to B Disable Time OEAB to B Setup Time, HIGH or LOW, Bus to Clock Hold Time, HIGH or LOW, Bus to Clock Clock Pulse Width HIGH or LOW (V) (Note 5) 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 2.0 2.0 2.5 2.0 1.0 2.0 1.0 3.0 1.5 4.0 7.0 6.5 6.5 7.0 5.0 7.0 5.0 9.5 9.0 10.0 10.5 8.0 10.5 8.0 2.0 2.0 2.5 2.0 1.0 2.0 1.0 3.0 1.5 4.0 10.0 9.5 10.5 11.0 8.5 11.0 8.5 ns ns ns ns ns Min TA = +25C CL = 50 pF Typ Max TA = -40C to +85C CL = 50 pF Min Max MHz ns ns ns Units Note 5: Voltage Range 5.0 is 5.0V 0.5V. Capacitance Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4.5 54 Units pF pF VCC = 5.0V VCC = 5.0V Conditions 5 www.fairchildsemi.com 74ACT652 Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M24B www.fairchildsemi.com 6 74ACT652 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC24 7 www.fairchildsemi.com 74ACT652 Transceiver/Register Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 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 8 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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