54FCT245 Octal Bidirectional Transceiver with TRI-STATE ® Outputs General Description Features The ’FCT245 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. n TTL input and output level compatible n A and B output sink capability of 48 mA, source capability of 12 mA n CMOS power consumption n Standard Microcircuit Drawing (SMD) 5962-8762901 Ordering Code: Military Package Package Description Number 54FCT245DMQB J20A 20-Lead Ceramic Dual-In-Line 54FCT245FMQB W20A 20-Lead Cerpak 54FCT245LMQB E20A 20-Lead Ceramic Leadless Chip Carrier, Type C Logic Symbol DS100950-1 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100950 www.national.com 54FCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs August 1998 Connection Diagrams Pin Assignment for DIP and Flatpak. Pin Assignment for LCC DS100950-3 Pin Descriptions DS100950-5 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 DS100950-4 www.national.com 2 Absolute Maximum Ratings (Note 1) in the HIGH State Current Applied to Output in LOW State (Max) 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 −0.5V to VCC twice the rated IOL (mA) Recommended Operating Conditions −65˚C to +150˚C −55˚C to +125˚C Free Air Ambient Temperature Military Supply Voltage Military −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 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. −0.5V to 5.5V DC Electrical Characteristics Symbol Parameter FCT245 Min Max Units VCC VIH Input HIGH Voltage VIL Input LOW Voltage VCD Input Clamp Diode Voltage VOH Output HIGH Voltage 54FCT 4.3 V Min 54FCT 2.4 V Min Output LOW Voltage 54FCT 0.2 V Min 54FCT 0.55 V Min µA Max µA Max VOL IIH 2.0 Input HIGH Current V Recognized HIGH Signal 0.8 V −1.2 V Recognized LOW Signal IIN = −18 mA (OE, T/R) 5 5 Min IBVIT Input HIGH Current Breakdown Test (I/O) IIL Input LOW Current −5 µA Max IOS Output Short-Circuit Current −60 mA Max ICCQ Power Supply Current 1.5 mA Max ∆ICC Power Supply Current 2.0 mA Max ICCT Total Power Supply Current 6.0 mA 5.5 mA Max 0.4 mA/ MHz Max ICCD 20 Dynamic ICC (Note 3) Conditions IOH = −300 uA (An, Bn) IOH = −12 mA (An, Bn) IOL = 300 uA (An, Bn) IOL = 48 mA (An, Bn) VIN = 2.7V (OE, T/R) VIN = VCC (OE, T/R) VIN = 5.5V (An, Bn) VIN = 0.0V (OE, T/R) VOUT = 0.0V (An, Bn) VIN = 0.2V or VIN = 5.3V, VCC = 5.5V VCC = 5.5V, VIN = 3.4V VIN = 3.4V or VIN = GND, OE = T/R = GND, VCC = 5.5V, fI = 10Mhz, outputs open, one bit toggling - 50% duty cycle VIN = 5.3V or VIN = 0.2V,OE = T/R = GND, VCC = 5.5V, fI = 10Mhz, outputs open, one bit toggling - 50% duty cycle Outputs Open, OE = GND, T/R = GND or VCC One Bit Toggling, 50% Duty Cycle Note 3: Guaranteed but not tested. 3 www.national.com AC Electrical Characteristics Symbol Parameter 54FCT TA = −55˚C to +125˚C VCC = 4.5V–5.5V Units Fig. No. CL = 50 pF Min Max 7.5 tPLH Propagation Delay 1.5 tPHL Data to Outputs 1.5 7.5 tPZH Output Enable 1.5 10.0 tPZL Time 1.5 10.0 tPHZ Output Disable 1.5 10.0 tPLZ Time 1.5 10.0 ns Figure 4 ns Figure 5 ns Figure 5 Capacitance Symbol Parameter Max Units CIN Input Capacitance 10.0 pF CI/O (Note 4) I/O Capacitance 12.0 pF Conditions TA = 25˚C VCC = 0V (OE , T/R) VCC = 5.0V (An, Bn) Note 4: CI/O is measured at frequency f = 1 MHz, per MIL-STD-883B, Method 3012. AC Loading DS100950-6 DS100950-7 *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 www.national.com 4 AC Waveforms DS100950-8 DS100950-10 FIGURE 4. Propagation Delay Waveforms for Inverting and Non-Inverting Functions FIGURE 5. TRI-STATE Output HIGH and LOW Enable and Disable Times 5 www.national.com 6 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 7 www.national.com 54FCT245 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. 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