54ABT245 Octal Bidirectional Transceiver with TRI-STATE ® Outputs General Description The ’ABT245 contains eight non-inverting bidirectional buffers with TRI-STATE outputs and is intended for bus-oriented applications. Current sinking capability is 48 mA on both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A ports to B ports; Receive (active LOW) enables data from B ports to A ports. The Output Enable input, when HIGH, disables both A and B ports by placing them in a High Z condition. Features n Bidirectional non-inverting buffers n A and B output sink capability of 48 mA, source capability of 24 mA n Guaranteed output skew n Guaranteed multiple output switching specifications n Output switching specified for both 50 pF and 250 pF loads n Guaranteed simultaneous switching, noise level and dynamic threshold performance n Guaranteed latchup protection n High impedance glitch-free bus loading during entire power up and power down cycle n Non-destructive hot insertion capability n Disable time is less than enable time to avoid bus contention n Standard Microcircuit Drawing (SMD) 5962-9214801 Ordering Code: Military Package Package Description Number 54ABT245J-QML J20A 20-Lead Ceramic Dual-In-Line 54ABT245W-QML W20A 20-Lead Cerpak 54ABT245E-QML E20A 20-Lead Ceramic Leadless Chip Carrier, Type C Logic Symbol DS100204-1 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100204 www.national.com 54ABT245 Octal Bidirectional Transceiver with TRI-STATE Outputs July 1998 Connection Diagrams Pin Assignment for DIP and Flatpak. Pin Assignment for LCC DS100204-3 Pin Descriptions DS100204-5 Pin Names Description OE Output Enable Input (Active LOW) T/R Transmit/Receive Input A0–A7 Side A Inputs or TRI-STATE Outputs B0–B7 Side B Inputs or TRI-STATE Outputs Truth Table Inputs OE Output T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z State H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram DS100204-4 www.national.com 2 Absolute Maximum Ratings (Note 1) in LOW State (Max) DC Latchup Source Current Over Voltage Latchup (I/O) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias Ceramic VCC Pin Potential to Ground Pin Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Any Output in the Disabled or Power-off State in the HIGH State Current Applied to Output twice the rated IOL (mA) −500 mA 10V Recommended Operating Conditions −65˚C to +150˚C −55˚C to +125˚C Free Air Ambient Temperature Military Supply Voltage Military Minimum Input Edge Rate Data Input Enable Input −55˚C to +175˚C −0.5V to +7.0V −0.5V to +7.0V −30 mA to +5.0 mA −55˚C to +125˚C +4.5V to +5.5V (∆V/∆t) 50 mV/ns 20 mV/ns 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. −0.5V to 5.5V −0.5V to VCC Note 2: Either voltage limit or current limit is sufficient to protect inputs. DC Electrical Characteristics Symbol Parameter ABT245 Min Typ VIH Input HIGH Voltage VIL Input LOW Voltage VCD Input Clamp Diode Voltage VOH Output HIGH Voltage Max 2.0 V Recognized HIGH Signal V −1.2 V Recognized LOW Signal IIN = −18 mA (OE, T/R) Min V Min 54ABT 2.0 V Min V Min µA Max µA Max µA Max µA Max V 0.0 IIH Input HIGH Current 54ABT 0.55 5 5 IBVI Input HIGH Current Breakdown Test 7 IBVIT Input HIGH Current Breakdown Test (I/O) 100 IIL Input LOW Current −5 −5 Input Leakage Test Conditions 0.8 2.5 Output LOW Voltage IIH + I VCC 54ABT VOL VID Units 4.75 IOH = −3 mA (An, Bn) IOH = −24 mA (An, Bn) IOL = 48 mA (An, Bn) VIN = 2.7V (OE, T/R) (Note 3) VIN = VCC (OE, T/R) VIN = 7.0V (OE, T/R) VIN = 5.5V (An, Bn) VIN = 0.5V (OE, T/R) (Note 3) VIN = 0.0V (OE, T/R) IID = 1.9 µA (OE, T/R) All Other Pins Grounded VOUT = 2.7V (An, Bn); OE = 2.0V VOUT = 0.5V (An, Bn); OE = 2.0V Output Leakage Current 50 µA 0 − 5.5V IIL + IOZL Output Leakage Current −50 µA 0 − 5.5V IOS Output Short-Circuit Current −275 mA Max ICEX Output High Leakage Current 50 µA Max IZZ Bus Drainage Test 100 µA 0.0 ICCH Power Supply Current 50 µA Max All Outputs HIGH ICCL Power Supply Current 30 mA Max ICCZ Power Supply Current 50 µA Max Additional Outputs Enabled 2.5 mA All Outputs LOW OE = VCC, T/R = GND or VCC; All Other GND or VCC VI = VCC − 2.1V ICC/Input Outputs TRI-STATE 2.5 mA Outputs TRI-STATE 50 µA ICCT OZH −100 Max VOUT = 0.0V (An, Bn) VOUT = VCC (An, Bn) VOUT = 5.5V (An, Bn); All Others GND OE, T/R VI = VCC − 2.1V Data Input VI = VCC − 2.1V All Others at VCCor GND. 3 www.national.com DC Electrical Characteristics Symbol (Continued) Parameter ABT245 Min Typ ICCD Dynamic ICC Max No Load 0.1 Units Conditions VCC mA/ MHz Outputs Open (Note 3) OE = GND, T/R = GND or VCC Max One Bit Toggling, 50% Duty Cycle (Note 4) Note 3: Guaranteed but not tested. Note 4: For 8 bits toggling, ICCD < 0.8 mA/MHz. DC Electrical Characteristics Symbol Parameter Min Max Units VCC VOLP Quiet Output Maximum Dynamic VOL 1.1 V 5.0 VOLV Quiet Output Minimum Dynamic VOL -0.45 V 5.0 Conditions CL = 50 pF, RL = 500Ω TA = 25˚C (Note 5) TA = 25˚C(Note 5) Note 5: Max number of outputs defined as (n). n − 1 data inputs are driven 0V to 3V. One output at LOW. AC Electrical Characteristics Symbol Parameter 54ABT TA = −55˚C to +125˚C VCC = 4.5V–5.5V Units CL = 50 pF Min Max tPLH Propagation Delay 1.0 4.8 tPHL Data to Outputs 1.0 4.8 tPZH Output Enable 1.0 6.7 tPZL Time 2.0 7.5 tPHZ Output Disable 1.7 7.4 tPLZ Time 1.7 6.5 ns ns ns Capacitance Symbol Parameter Typ Units CIN Input Capacitance 5.0 pF CI/O (Note 6) I/O Capacitance 11.0 pF Note 6: CI/O is measured at frequency f = 1 MHz, per MIL-STD-883B, Method 3012. www.national.com 4 Conditions TA = 25˚C VCC = 0V (OE , T/R) VCC = 5.0V (An, Bn) Capacitance (Continued) tPLH vs Temperature (TA) CL = 50 pF, 1 Output Switching tPHL vs Temperature (TA) CL = 50 pF, 1 Output Switching DS100204-14 tPLH vs Load Capacitance 1 Output Switching, TA = 25˚C DS100204-15 tPHL vs Load Capacitance 1 Output Switching, TA = 25˚C DS100204-16 DS100204-17 Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table. tPLH vs Load Capacitance 8 Outputs Switching, TA = −40˚C to +85˚C tPHL vs Load Capacitance 8 Outputs Switching, TA = 25˚C DS100204-18 DS100204-19 5 www.national.com Capacitance (Continued) tPZL vs Temperature (TA) CL = 50 pF, 1 Output Switching tPLZ vs Temperature (TA) CL = 50 pF, 1 Output Switching DS100204-20 tPZL vs Temperature (TA) CL = 50 pF, 8 Outputs Switching DS100204-21 tPLZ vs Temperature (TA) CL = 50 pF, 8 Outputs Switching DS100204-22 DS100204-23 Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table. tPZH vs Temperature (TA) CL = 50 pF, 1 Output Switching tPHZ vs Temperature (TA) CL = 50 pF, 1 Output Switching DS100204-24 www.national.com DS100204-25 6 Capacitance (Continued) tPZH vs Temperature (TA) CL = 50 pF, 8 Outputs Switching tPHZ vs Temperature (TA) CL = 50 pF, 8 Outputs Switching DS100204-26 tPZH vs Load Capacitance 8 Outputs Switching, TA = 25˚C DS100204-27 tPZL vs Load Capacitance 8 Outputs Switching, TA = 25˚C DS100204-28 DS100204-29 Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table. tPLH and tPHL vs Number Outputs Switching VCC = 5.0V, TA = 25˚C, CL = 50 pF ICC vs Frequency, Average, TA = 25˚C, All Outputs Unloaded/Unterminated DS100204-30 DS100204-31 Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table. 7 www.national.com AC Loading DS100204-6 DS100204-7 *Includes jig and probe capacitance FIGURE 2. Test Input Signal Levels FIGURE 1. Standard AC Test Load Amplitude Rep. Rate tw tr tf 3.0V 1 MHz 500 ns 2.5 ns 2.5 ns FIGURE 3. Test Input Signal Requirements AC Waveforms DS100204-8 DS100204-10 FIGURE 4. Propagation Delay Waveforms for Inverting and Non-Inverting Functions www.national.com FIGURE 5. TRI-STATE Output HIGH and LOW Enable and Disable Times 8 Physical Dimensions inches (millimeters) unless otherwise noted 20-Terminal Ceramic Chip Carrier (L) NS Package Number E20A 20-Lead Ceramic Dual-In-Line Package (D) NS Package Number J20A 9 www.national.com 54ABT245 Octal Bidirectional Transceiver with TRI-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Ceramic Flatpak (F) NS Package Number W20A 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. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: [email protected] National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.