74ABT16952 16-Bit Registered Transceiver with TRI-STATEÉ Outputs General Description Features The ’ABT16952 is a 16-bit registered transceiver. Two 8-bit back to back registers store data flowing in both directions between two bidirectional buses. Separate clock, clock enable and TRI-STATEÉ output enable signals are provided for each register. The output pins are guaranteed to source 32 mA (24 mA mil.) and to sink 64 mA (48 mA mil). Y Y Y Y Y Commercial Separate clock, clock enable and TRI-STATE output enable provided for each register A and B output sink capability of 64 mA source capability of 32 mA Guaranteed latchup protection High impedance glitch free bus loading during entire power up and power down cycle Nondestructive hot insertion capability Package Number Package Description 74ABT16952CSSC (Note 1) MS56A 56-Lead (0.300× Wide) Molded Shrink Small Outline, JEDEC (SSOP) 74ABT16952CMTD (Notes 1, 2) MTD56 56-Lead Molded Thin Shrink Small Outline, JEDEC (TSSOP) Note 1: Devices also available in 13× reel. Use suffix e SSCX and MTDX. Note 2: Contact factory for package availability. Pin Descriptions Pin Names A0 – A16 B0 – B16 CPABn, CPBAn CEAn, CEBn OEABn, OEBAn Connection Diagram Description Pin Assignment for SSOP Data Register A Inputs/ B-Register TRI-STATE Outputs Data Register B Inputs/ A-Register TRI-STATE Outputs Clock Pulse Inputs Clock Enable Output Enable Inputs TL/F/11647 – 1 TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1996 National Semiconductor Corporation TL/F/11647 RRD-B30M96/Printed in U. S. A. http://www.national.com 74ABT16952 16-Bit Registered Transceiver with TRI-STATE Outputs September 1996 Pin Descriptions (Continued) Register Function Table (Applies to A or B Register) Output Control Internal Q Output H X Z Disable Outputs L L L H L H Enable Outputs OE H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Inputs CE Internal Q Function CP X X H NC Hold Data L H L L L L L H Load Data Function D Z L NC e HIGH Impedance e LOW-to-HIGH Transition e No Change Block Diagram TL/F/11647 – 2 n for either byte 1 or byte 2 http://www.national.com 2 Absolute Maximum Ratings (Note 1) Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias Plastic VCC Pin Potential to Ground Pin Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Any Output in the Disable or Power-Off State in the HIGH State b 65§ C to a 150§ C b 55§ C to a 125§ C Current Applied to Output in LOW State (Max) DC Latchup Source Current Over Voltage Latchup (I/O) b 55§ C to a 150§ C twice the rated IOL (mA) b 500 mA 10V Recommended Operating Conditions b 0.5V to a 7.0V b 0.5V to a 7.0V b 30 mA to a 5.0 mA Free Air Ambient Temperature Commercial Supply Voltage Commercial Minimum Input Edge Rate Data Input Enable Input Clock Input b 0.5V to a 5.5V b 0.5V to VCC Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Note 2: Either voltage limit or current limit is sufficient to protect inputs. b 40§ C to a 85§ C a 4.5V to a 5.5V (DV/Dt) 50 mV/ns 20 mV/ns 100 mV/ns DC Electrical Characteristics Symbol ABT16952 Parameter Min VIH Input HIGH Voltage VIL Input LOW Voltage VCD Input Clamp Diode Voltage VOH Output HIGH Voltage 74ABT 74ABT VOL Output LOW Voltage 74ABT VID Input Leakage Test IIH Input HIGH Current IBVI Input HIGH Current Breakdown Test IBVIT Input HIGH Current Breakdown Test (I/O) IIL Input LOW Current IIH a IOZH Typ Max 2.0 Units VCC Conditions V Recognized HIGH Signal 0.8 V Recognized LOW Signal b 1.2 V Min 2.5 2.0 IIN e b18 mA (Non I/O Pins) IOH e b3 mA (An, Bn) IOH e b32 mA (An, Bn) 0.55 IOL e 64 mA (An, Bn) V 0.0 IID e 1.9 mA (Non-I/O Pins) All Other Pins Grounded 5 mA Max VIN e 2.7V (Non-I/O Pins) (Note 2) VIN e VCC (Non-I/O Pins) 7 mA Max VIN e 7.0V (Non-I/O Pins) 100 mA Max VIN e 5.5V (An, Bn) b5 mA Max VIN e 0.5V (Non-I/O Pins) (Note 2) VIN e 0.0V (Non-I/O Pins) Output Leakage Current 50 mA 0V – 5.5V VOUT e 2.7V (An, Bn); OEA or OEB e 2.0V IIL a IOZL Output Leakage Current b 50 mA 0V – 5.5V VOUT e 0.5V (An, Bn); OEA or OEB e 2.0V IOS Output Short-Circuit Current b 275 mA Max VOUT e 0V (An, Bn) ICEX Output HIGH Leakage Current 50 mA Max VOUT e VCC (An, Bn) IZZ Bus Drainage Test 100 mA 0.0V VOUT e 5.5V (An, Bn); All Others GND ICCH Power Supply Current 1.0 mA Max All Outputs HIGH ICCL Power Supply Current 60 mA Max All Outputs LOW ICCZ Power Supply Current ICCT Additional ICC/Input 4.75 b 100 3 1.0 mA Max Outputs TRI-STATE; All Others GND 2.5 mA Max VI e VCC b 2.1V; All Others at VCC or GND http://www.national.com DC Electrical Characteristics Symbol ICCD ABT16952 Parameter Dynamic ICC (Note 2) (Continued) Min Typ Max Units VCC mA/MHz Max No Load 0.18 Conditions Outputs Open OEA or OEB e GND, Non-I/O e GND or VCC One Bit toggling, 50% duty cycle (Note 1) Note 1: For 8-bit toggling, ICCD k 1.4 mA/MHz. Note 2: Guaranteed, but not tested. AC Electrical Characteristics Symbol Parameter 74ABT 74ABT TA e a 25§ C VCC e a 5.0V CL e 50 pF TA e b40§ C to a 85§ C VCC e 4.5V to 5.5V CL e 50 pF Min Max Min Units Max fmax Max Clock Frequency tPLH tPHL Propagation Delay CPABn or CPBAn to An or Bn 1.5 1.5 5.3 5.3 1.5 1.5 5.3 5.3 ns tPZH tPZL Output Enable Time OEABn or OEBAn to An or Bn 1.5 1.5 5.5 5.5 1.5 1.5 5.5 5.5 ns tPHZ tPLZ Output Disable Time OEABn or OEBAn to An or Bn 1.5 1.5 6.0 6.0 1.5 1.5 6.0 6.0 ns 200 200 MHz AC Operating Requirements Symbol Parameter 74ABT 74ABT TA e a 25§ C VCC e a 5.0V CL e 50 pF TA e b40§ C to a 85§ C VCC e 4.5V to 5.5V CL e 50 pF Min Max Min Units Max ts(H) ts(L) Setup Time, HIGH or LOW An or Bn to CPABn or CPBAn 2.5 2.5 2.5 2.5 ns th(H) th(L) Hold Time, HIGH or LOW An or Bn to CPABn or CPBAn 1.5 1.5 1.5 1.5 ns ts(H) ts(L) Setup Time, HIGH or LOW CEAn or CEBn to CPABn or CPBAn 2.5 2.5 2.5 2.5 ns th(H) th(L) Hold Time, HIGH or LOW CEAn or CEBn to CPABn or CPBAn 1.5 1.5 1.5 1.5 ns tw(H) tw(L) Pulse Width, HIGH or LOW to CPABn or CPBAn 3.0 3.0 3.0 3.0 ns http://www.national.com 4 Capacitance Symbol Parameter Typ Units Conditions TA e 25§ C CIN Input Capacitance 5 pF VCC e 0V (Non I/O Pins) CI/O (Note 1) Output Capacitance 11 pF VCC e 5.0V (An, Bn) Note 1: CI/O is measured at frequency f e 1 MHz, per MIL-STD-883B, Method 3012. AC Loading TL/F/11647 – 3 *Includes jig and probe capacitance TL/F/11647 – 4 FIGURE 1. Standard AC Test Load FIGURE 2a. Test Input Signal Levels Amplitude Rep. Rate tW tr tf 3.0V 1 MHz 500 ns 2.5 ns 2.5 ns FIGURE 2b. Input Signal Requirements TL/F/11647 – 5 FIGURE 3. Propagation Delay Waveforms for Inverting and Non-Inveting Functions TL/F/11647 – 6 FIGURE 4. Propagation Delay, Pulse Width Waveforms 5 http://www.national.com AC Loading (Continued) TL/F/11647–7 FIGURE 5. TRI-STATE Output HIGH and LOW Enable and Disable Times TL/F/11647 – 8 FIGURE 6. Setup Time, Hold Time and Recovery Time Waveforms Ordering Information The device number is used to form part of a simplified purchasing code where the package type and temperature range are defined as follows: TL/F/11647 – 9 http://www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted 56-Lead SSOP (0.300× Wide) (SS) 74ABT16952CSSC or 74ABT16952CSSCX NS Package Number MS56A 7 http://www.national.com 74ABT16952 16-Bit Registered Transceiver with TRI-STATE Outputs Physical Dimensions millimeters (Continued) 56-Lead Molded Thin Shrink Small Outline Package, JEDEC 74ABT16952CMTD NS Package Number MTD56 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: 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 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 http://www.national.com 2. A critical component is 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. 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