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74ACTQ821 Quiet Series 10-Bit D-Type Flip-Flop with 3-STATE Outputs
March 1990 Revised September 2000
74ACTQ821 Quiet Series 10-Bit D-Type Flip-Flop with 3-STATE Outputs
General Description
The ACTQ821 is a 10-bit D-type flip-flop with non-inverting 3-STATE outputs arranged in a broadside pinout. The ACTQ821 utilizes Fairchild's Quiet Series technology to guarantee quiet output switching and improved dynamic threshold performance. FACT Quiet Series features GTO output control and undershoot corrector in addition to a split ground bus for superior performance.
Features
s Guaranteed simultaneous switching noise level and dynamic threshold performance s Guaranteed pin-to-pin skew AC performance s Non-inverting 3-STATE outputs for bus interfacing s 4 kV minimum ESD immunity s Outputs source/sink 24 mA
Ordering Code:
Order Number 74ACTQ821SC 74ACTQ821SPC 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-001, 0.300 Wide
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names D0-D9 O0-O9 OE CP Description Data Inputs Data Outputs Output Enable Input Clock Input
FACT, Quiet Series, FACT Quiet Series, and GTO are trademarks of Fairchild Semiconductor Corporation.
(c) 2000 Fairchild Semiconductor Corporation
DS010686
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74ACTQ821
Functional Description
The ACTQ821 consists of ten-bit D-type edge-triggered flip-flops. The buffered Clock (CP) and buffered Output Enable (OE) are common to all flip-flops. The flip-flops will store the state of their individual D inputs that meet the setup and hold time requirements on the LOW-to-HIGH CP transition. With OE LOW the contents of the flip-flops are available at the outputs. When OE is HIGH the outputs go to the high impedance state. Operation of the OE input does not affect the state of the flip-flops. The ACTQ821 is functionally and pin compatible with the AM29821.
Function Table
Inputs OE H H L L CP Internal D L H L H Q L H L H Outputs Function O Z Z L H High Z High Z Load Load
H = HIGH Voltage Level L = LOW Voltage Level Z = HIGH Impedance = LOW-to-HIGH Clock Transition

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.
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74ACTQ821
Absolute Maximum Ratings(Note 1)
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 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 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. 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 IOZ ICCT IOLD IOHD ICC VOLP VOLV VIHD VILD Maximum Input Leakage Current Maximum 3-STATE Leakage Current Maximum ICC/Input Minimum Dynamic Output Current (Note 3) Maximum Quiescent Supply Current Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage 5.5 5.5 5.5 5.5 5.5 5.5 5.0 5.0 5.0 5.0 1.1 - 0.6 1.9 1.2 8.0 1.5 - 1.2 2.2 0.8 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 0.5 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 5.0 1.5 75 -75 80.0 A A mA mA mA A V V V V 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 2) IOUT = 50 A VIN = VIL or VIH V IOL = 24 mA IOL = 24 mA (Note 2) 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 Figure 1, Figure 2 (Note 4)(Note 5) Figure 1, Figure 2 (Note 4)(Note 5) (Note 4)(Note 6) (Note 4)(Note 6)
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74ACTQ821
DC Electrical Characteristics
Note 4: DIP package.
(Continued)
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. Note 5: Max number of outputs defined as (n). Data inputs are driven 0V to 3V. One output @ GND. Note 6: Maximum number of data inputs (n) switching. (n-1) inputs switching 0V to 3V. Input-under-test switching: 3V to threshold (VILD), 0V to threshold (VIHD), f = 1 MHz.
AC Electrical Characteristics
VCC Symbol fMAX tPLH tPHL tPZH tPZL tPHZ tPLZ tOSLH tOSHL Parameter Maximum Clock Frequency Propagation Delay CP to On Output Enable Time OE to On Output Disable Time OE to On Output to Output Skew CP to On (Note 8) (V) (Note 7) 5.0 5.0 5.0 5.0 5.0 Min 120 3.0 3.0 1.0 6.5 7.5 6.5 0.5 9.5 10.5 8.5 1.0 TA = + 25C CL = 50 pF Typ Max TA = - 40C to + 85C CL = 50 pF Min 110 2.5 2.5 1.0 10.5 11.5 9.0 1.0 Max MHz ns ns ns ns Units
Note 7: Voltage Range 5.0 is 5.0V 0.5V Note 8: Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs within the same packaged device. The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Parameter guaranteed by design. Not tested.
AC Operating Requirements
VCC Symbol tS tH tH Parameter Setup Time, HIGH or LOW Dn to CP Hold Time, HIGH or LOW Dn to CP CP Pulse Width HIGH or LOW
Note 9: Voltage Range 5.0 is 5.0V 0.5V
TA = + 25C CL = 50 pF Typ 3.0 1.5 4.5
TA = - 40C to + 85C CL = 50 pF Guaranteed Minimum 3.0 1.5 5.5 ns ns ns Units
(V) (Note 9) 5.0 5.0 5.0
Capacitance
Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4.5 55.0 Units pF pF Conditions VCC = OPEN VCC = 5.0V
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74ACTQ821
FACT Noise Characteristics
The setup of a noise characteristics measurement is critical to the accuracy and repeatability of the tests. The following is a brief description of the setup used to measure the noise characteristics of FACT. Equipment: Hewlett Packard Model 8180A Word Generator PC-163A Test Fixture Tektronics Model 7854 Oscilloscope Procedure: 1. Verify Test Fixture Loading: Standard Load 50 pF, 500. 2. Deskew the HFS generator so that no two channels have greater than 150 ps skew between them. This requires that the oscilloscope be deskewed first. It is important to deskew the HFS generator channels before testing. This will ensure that the outputs switch simultaneously. 3. Terminate all inputs and outputs to ensure proper loading of the outputs and that the input levels are at the correct voltage. 4. Set the HFS generator to toggle all but one output at a frequency of 1 MHz. Greater frequencies will increase DUT heating and effect the results of the measurement. 5. Set the HFS generator input levels at 0V LOW and 3V HIGH for ACT devices and 0V LOW and 5V HIGH for AC devices. Verify levels with an oscilloscope. VOLP/VOLV and VOHP/VOHV: * Determine the quiet output pin that demonstrates the greatest noise levels. The worst case pin will usually be the furthest from the ground pin. Monitor the output voltages using a 50 coaxial cable plugged into a standard SMB type connector on the test fixture. Do not use an active FET probe. * Measure VOLP and VOLV on the quiet output during the worst case transition for active and enable. Measure VOHP and VOHV on the quiet output during the worst case active and enable transition. * Verify that the GND reference recorded on the oscilloscope has not drifted to ensure the accuracy and repeatability of the measurements. VILD and VIHD: * Monitor one of the switching outputs using a 50 coaxial cable plugged into a standard SMB type connector on the test fixture. Do not use an active FET probe. * First increase the input LOW voltage level, VIL, until the output begins to oscillate or steps out a min of 2 ns. Oscillation is defined as noise on the output LOW level that exceeds VIL limits, or on output HIGH levels that exceed VIH limits. The input LOW voltage level at which oscillation occurs is defined as VILD. * Next decrease the input HIGH voltage level VIH until the output begins to oscillate or steps out a min of 2ns. Oscillation is defined as noise on the output LOW level that exceeds VIL limits, or on output HIGH levels that exceed VIH limits. The input HIGH voltage level at which oscillation occurs is defined as VIHD. * Verify that the GND reference recorded on the oscilloscope has not drifted to ensure the accuracy and repeatability of the measurements.
Note 10: VOHV and VOLP are measured with respect to ground reference. Note 11: Input pulses have the following characteristics: f = 1 MHz, tr = 3 ns, tf = 3 ns, skew < 150 ps.
FIGURE 1. Quiet Output Noise Voltage Waveforms
FIGURE 2. Simultaneous Switching Test Circuit
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74ACTQ821
Physical Dimensions inches (millimeters) unless otherwise noted
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M24B
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74ACTQ821 Quiet Series 10-Bit D-Type Flip-Flop with 3-STATE Outputs
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. 7 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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