Revised August 1999 74F545 Octal Bidirectional Transceiver with 3-STATE Outputs General Description Features The 74F545 is an 8-bit, 3-STATE, high-speed transceiver. It provides bidirectional drive for bus-oriented microprocessor and digital communications systems. Straight through bidirectional transceivers are featured, with 24 mA bus drive capability on the A Ports and 64 mA bus drive capability on the B Ports. One input, Transmit/Receive (T/R) determines the direction of logic signals through the bidirectional transceiver. Transmit enables data from A-to-B Ports; Receive enables data from B-to-A Ports. The Output Enable input disables both A and B Ports by placing them in a 3-STATE condition. ■ Higher drive than 8304 ■ 8-bit bidirectional data flow reduces system package count ■ 3-STATE inputs/outputs for interfacing with bus-oriented systems ■ 24 mA and 64 mA bus drive capability on A and B Ports, respectively ■ Transmit/Receive and Output Enable simplify control logic ■ Guaranteed 4000V minimum ESD protection Ordering Code: Order Number Package Number Package Description 74F545SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 74F545PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC © 1999 Fairchild Semiconductor Corporation DS009556 www.fairchildsemi.com 74F545 Octal Bidirectional Transceiver with 3-STATE Outputs April 1988 74F545 Unit Loading/Fan Out Pin Names U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL Description OE Output Enable Input (Active LOW) 1.0/2.0 20 µA/−1.2 mA T/R Transmit/Receive Input 1.0/2.0 20 µA/−1.2 mA A0–A7 Side A 3-STATE Inputs or 3-STATE Outputs B0–B7 Side B 3-STATE Inputs or 3-STATE Outputs 3.5/1.083 70 µA/−650 µA 150/40 (33.3) −3 mA/24 mA (20 mA) 3.5/1.083 70 µA/−650 µA 600/106.6 (80) −12 mA/64 mA (48 mA) Truth Table Inputs OE Outputs T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance 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 Storage Temperature −65°C to +150°C Ambient Temperature under Bias −55°C to +125°C Junction Temperature under Bias −55°C to +150C VCC Pin Potential to Ground Pin −0.5V to +7.0V Input Voltage (Note 2) −0.5V to +7.0V Input Current (Note 2) −30 mA to +5.0 mA Recommended Operating Conditions 0°C to +70°C Free Air Ambient Temperature +4.5V to +5.5V Supply Voltage Voltage Applied to Output in HIGH State (with VCC = 0V) Standard Output −0.5V to VCC 3-STATE Output −0.5V 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. Current Applied to Output Note 2: Either voltage limit or current limit is sufficient to protect inputs. twice the rated IOL (mA) in LOW State (Max) ESD Last Passing Voltage (Min) 4000V DC Electrical Characteristics Symbol Parameter Min Typ Max Input HIGH Voltage VIL Input LOW Voltage 0.8 V VCD Input Clamp Diode Voltage −1.2 V VOH Output HIGH 10% VCC 2.5 Voltage 10% VCC 2.4 10% VCC 2.0 5% VCC 2.7 5% VCC 2.7 VOL IIH 2.0 Units VIH 10% VCC 0.5 Voltage 10% VCC 0.55 Input HIGH Input HIGH Current Input HIGH Current Output HIGH Input Leakage Test IOD Circuit Current Input LOW Current IIH + IOZH Output Leakage Current IIL + IOZL Output Leakage Current IOS Output Short-Circuit Current IOH = −15 mA (Bn) IOL = 24 mA (A n) V Min 5.0 µA Max VIN = 2.7V (OE, T/R) 7.0 µA Max VIN = 7.0V (OE, T/R) 0.5 mA Max VIN = 5.5V (An, Bn) 50 µA Max VOUT = VCC V 0.0 3.75 µA 0.0 −1.2 mA Max VIN = 0.5V (OE, T/R) 70 µA Max VOUT = 2.7V (An, Bn) −650 µA Max VOUT = 0.5V (An, Bn) mA Max 500 µA 0.0V VOUT = 5.25V mA Max VO = HIGH 4.75 Output Leakage IIL Min IOH = −3 mA (An) Output LOW Leakage Current VID IIN = −18 mA (OE, T/R) IOH = −1 mA (An) Breakdown (I/O) ICEX Recognized as a LOW Signal Min IOH = −3 mA (An) V Breakdown Test IBVIT Conditions Recognized as a HIGH Signal IOH = −1 mA (An) Current IBVI VCC V −60 −150 −100 −225 IOL = 64 mA (B n) IID = 1.9 µA All Other Pins Grounded VIOD = 150 mV All Other Pins Grounded VOUT = 0V (An) VOUT = 0V (Bn) IZZ Bus Drainage Test ICCH Power Supply Current 70 90 ICCL Power Supply Current 95 120 mA Max VO = LOW ICCZ Power Supply Current 85 110 mA Max VO = HIGH Z 3 www.fairchildsemi.com 74F545 Absolute Maximum Ratings(Note 1) 74F545 AC Electrical Characteristics Symbol Parameter TA = +25°C TA = −55°C to +125°C TA = 0°C to +70°C VCC = +5.0V VCC = +5.0V VCC = +5.0V CL = 50 pF CL = 50 pF CL = 50 pF Min Typ Max Min Max Min Max tPLH Propagation Delay 2.5 4.2 6.0 2.0 7.5 2.5 7.0 tPHL An to Bn or Bn to An 2.5 4.6 6.0 2.0 7.5 2.5 7.0 tPZH Output Enable Time 3.0 5.3 7.0 2.5 9.0 3.0 8.0 3.5 6.0 8.0 3.0 10.0 3.5 9.0 3.0 5.0 6.5 2.5 9.0 3.0 7.5 2.0 5.0 6.5 2.0 10.0 2.0 7.5 tPZL tPHZ Output Disable Time tPLZ www.fairchildsemi.com 4 Units ns ns 74F545 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B 5 www.fairchildsemi.com 74F545 Octal Bidirectional Transceiver with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A 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. 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