Revised August 1999 74FR2245 Octal Bidirectional Transceiver with 3-STATE Outputs General Description Features The 74FR2245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus-oriented applications. Current sinking capability is 64 mA on the A Port. 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. ■ Non-inverting buffers ■ Bidirectional data path ■ Guaranteed pin-to-pin skew ■ 25Ω series resistors in B outputs eliminate the need for external resistors ■ 3-STATE outputs drive bus lines or buffer memory address resistors Ordering Code: Order Number Package Number 74FR2245SC M20B Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” letter to the ordering code. Logic Symbol Connection Diagram Pin Descriptions Truth Table Pin Names Inputs Description Output OE T/R L L Side A Inputs or 3-STATE Outputs L H Bus A Data to Bus B Side B Inputs or 3-STATE Outputs H X High Z State OE Output Enable Input (Active-LOW) T/R Transmit/Receive Input A0–A7 B0–B7 © 1999 Fairchild Semiconductor Corporation Bus B Data to Bus A H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial DS012114 www.fairchildsemi.com 74FR2245 Octal Bidirectional Transceiver with 3-STATE Outputs April 1995 74FR2245 Logic Diagram www.fairchildsemi.com 2 Recommended Operating Conditions Storage Temperature −65°C to +150°C Ambient Temperature under Bias −55°C to +125°C Free Air Ambient Temperature Junction Temperature under Bias −55°C to +150°C Supply Voltage 0°C to +70°C +4.5V to +5.5V −0.5V to +7.0V VCC Pin Potential to Ground Pin Input Voltage (Note 2) −0.5V to +7.0V Input Current (Note 2) −30 mA to +5.0 mA 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 in LOW State (Max) Note 2: Either voltage limit or current limit is sufficient to protect inputs. twice the rated IOL (mA) ESD Last Passing Voltage (Min) 4000V DC Electrical Characteristics Symbol Parameter Min Typ Max 2.0 Units VCC V Conditions VIH Input HIGH Voltage VIL Input LOW Voltage 0.8 V VCD Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA VOH Output HIGH Voltage V Min IOH = −3 mA (An, Bn) IOH = −15 mA (An, Bn) VOL Output LOW Voltage 2.4 2.0 IIH Input HIGH Current IBVI Input HIGH Current Breakdown Test IBVIT Input HIGH Current Breakdown Test (I/O) IIL Input LOW Current VID Input Leakage Test Recognized HIGH Signal Recognized LOW Signal V Min 0.5 V Max IOL = 1 mA (Bn) 0.75 V Max IOL = 12 mA (Bn) 0.55 V Max IOL = 64 mA (An) 5 µA Max VIN = 2.7V (OE, T/R) 7 µA Max VIN = 7.0V (OE, T/R) 100 µA Max VIN = 5.5V (An, B n) −250 µA Max VIN = 0.5V (OE, T/R) V 0.0 4.75 IID = 1.9 µA All Other Pins Grounded 3.75 µA 0.0 VIOD = 150 mV 25 µA Max VOUT = 2.7V (An, Bn) −150 µA Max VOUT = 0.5V (An, Bn) −225 mA Max VOUT = 0.0V (An, Bn) 50 µA Max VOUT = VCC (An, Bn) IOD Output Circuit Leakage Current IIH + IOZH Output Leakage Current IIL + IOZL Output Leakage Current IOS Output Short-Circuit Current ICEX Output HIGH Leakage Current IZZ Bus Drainage Test 100 µA 0.0 VOUT = 5.25V (An, Bn) ICCH Power Supply Current 55 75 mA Max All Outputs HIGH ICCL Power Supply Current 75 110 mA Max All Outputs LOW ICCZ Power Supply Current 55 75 mA Max Outputs 3-STATE CIN Input Capacitance All Other Pins Grounded −100 8.0 pF 5.0 OE, T/R 17.0 pF 5.0 An, Bn 3 www.fairchildsemi.com 74FR2245 Absolute Maximum Ratings(Note 1) 74FR2245 AC Electrical Characteristics Symbol Parameter TA = +25°C TA = 0°C to +70°C VCC = +5.0V VCC = +5.0V CL = 50 pF CL = 50 pF Max Min Max tPLH Propagation Delay Min 1.0 4.4 1.0 4.4 tPHL An to Bn or Bn to An 1.0 4.4 1.0 4.4 tPZH Output Enable Time tPZL tPHZ Output Disable Time tPLZ Typ 2.5 7.5 2.5 7.5 2.5 7.5 2.5 7.5 1.7 6.5 1.7 6.5 1.7 6.5 1.7 6.5 Units ns ns ns Extended AC Electrical Characteristics Symbol Parameter TA = 0°C to +70°C TA = 0°C to +70°C VCC = +5.0V VCC = +5.0V CL = 50 pF CL = 250 pF Eight Outputs Switching (Note 4) Units (Note 3) Min Max Min Max tPLH Propagation Delay 1.0 7.0 2.5 10.0 tPHL An to Bn or Bn to An 1.0 7.0 2.5 10.0 tPZH Output Enable Time 2.5 10.0 2.5 10.0 tPZL tPHZ Output Disable Time tPLZ tOSHL Pin-to-Pin Skew (Note 5) for HL Transitions tOSLH Pin-to-Pin Skew (Note 5) for LH Transitions tOST Pin-to-Pin Skew (Note 5) for HL/LH Transitions 1.3 6.5 1.3 6.5 ns ns ns 1.7 ns 1.0 ns 3.3 ns Note 3: This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase, i.e., all LOW-to-HIGH, HIGH-to-LOW, 3-STATE-to-HIGH, etc. Note 4: These specifications guaranteed but not tested. The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load. This specification pertains to single output switching only. Note 5: Skew is defined as the absolute value of the difference between the actual propagation delays for any two outputs of the same device. The specification applies to any outputs switching HIGH-to-LOW (tOSHL), LOW-to-HIGH (tOSLH), or HIGH-to-LOW and/or LOW-to-HIGH (tOST). Specifications guaranteed with all outputs switching in phase. www.fairchildsemi.com 4 74FR2245 Octal Bidirectional Transceiver with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B 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: 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. 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. www.fairchildsemi.com 5 www.fairchildsemi.com