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| 74FR2245 Octal Bidirectional Transceiver with 3-STATE Outputs April 1995 Revised August 1999 74FR2245 Octal Bidirectional Transceiver with 3-STATE Outputs General Description 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. Features s Non-inverting buffers s Bidirectional data path s Guaranteed pin-to-pin skew s 25 series resistors in B outputs eliminate the need for external resistors s 3-STATE outputs drive bus lines or buffer memory address resistors Ordering Code: Order Number 74FR2245SC Package Number 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 Pin Names OE T/R A0-A7 B0-B7 Description Output Enable Input (Active-LOW) Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs Truth Table Inputs OE L L H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Output T/R L H X Bus B Data to Bus A Bus A Data to Bus B High Z State (c) 1999 Fairchild Semiconductor Corporation DS012114 www.fairchildsemi.com 74FR2245 Logic Diagram www.fairchildsemi.com 2 74FR2245 Absolute Maximum Ratings(Note 1) Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias VCC Pin Potential to Ground Pin Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC = 0V) Standard Output 3-STATE Output Current Applied to Output in LOW State (Max) ESD Last Passing Voltage (Min) twice the rated IOL (mA) 4000V -0.5V to VCC -0.5V to +5.5V -65C to +150C -55C to +125C -55C to +150C -0.5V to +7.0V -0.5V to +7.0V -30 mA to +5.0 mA Recommended Operating Conditions Free Air Ambient Temperature Supply Voltage 0C to +70C +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. DC Electrical Characteristics Symbol VIH VIL VCD VOH VOL Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage 2.4 2.0 0.5 0.75 0.55 IIH IBVI IBVIT IIL VID IOD IIH + IOZH IIL + IOZL IOS ICEX IZZ ICCH ICCL ICCZ CIN Input HIGH Current Input HIGH Current Breakdown Test Input HIGH Current Breakdown Test (I/O) Input LOW Current Input Leakage Test Output Circuit Leakage Current Output Leakage Current Output Leakage Current Output Short-Circuit Current Output HIGH Leakage Current Bus Drainage Test Power Supply Current Power Supply Current Power Supply Current Input Capacitance 55 75 55 8.0 17.0 -100 4.75 3.75 25 -150 -225 50 100 75 110 75 5 7 100 -250 Min 2.0 0.8 -1.2 Typ Max Units V V V V V V V V A A A A V A A A mA A A mA mA mA pF pF Min Min Min Max Max Max Max Max Max Max 0.0 0.0 Max Max Max Max 0.0 Max Max Max 5.0 5.0 VCC Conditions Recognized HIGH Signal Recognized LOW Signal IIN = -18 mA IOH = -3 mA (An, Bn) IOH = -15 mA (An, Bn) IOL = 1 mA (Bn) IOL = 12 mA (Bn) IOL = 64 mA (An) VIN = 2.7V (OE, T/R) VIN = 7.0V (OE, T/R) VIN = 5.5V (An, B n) VIN = 0.5V (OE, T/R) IID = 1.9 A All Other Pins Grounded VIOD = 150 mV All Other Pins Grounded VOUT = 2.7V (An, Bn) VOUT = 0.5V (An, Bn) VOUT = 0.0V (An, Bn) VOUT = VCC (An, Bn) VOUT = 5.25V (An, Bn) All Outputs HIGH All Outputs LOW Outputs 3-STATE OE, T/R An, Bn 3 www.fairchildsemi.com 74FR2245 AC Electrical Characteristics TA = +25C Symbol Parameter Min tPLH tPHL tPZH tPZL tPHZ tPLZ Output Disable Time Propagation Delay An to Bn or Bn to An Output Enable Time 1.0 1.0 2.5 2.5 1.7 1.7 VCC = +5.0V CL = 50 pF Typ Max 4.4 4.4 7.5 7.5 6.5 6.5 TA = 0C to +70C VCC = +5.0V CL = 50 pF Min 1.0 1.0 2.5 2.5 1.7 1.7 Max 4.4 4.4 7.5 7.5 6.5 6.5 ns ns ns Units Extended AC Electrical Characteristics Symbol Parameter TA = 0C to +70C VCC = +5.0V CL = 50 pF Eight Outputs Switching (Note 3) Min tPLH tPHL tPZH tPZL tPHZ tPLZ tOSHL (Note 5) tOSLH (Note 5) tOST (Note 5) Pin-to-Pin Skew for HL Transitions Pin-to-Pin Skew for LH Transitions Pin-to-Pin Skew for HL/LH Transitions Output Disable Time Propagation Delay An to Bn or Bn to An Output Enable Time 1.0 1.0 2.5 2.5 1.3 1.3 Max 7.0 7.0 10.0 10.0 6.5 6.5 1.7 1.0 3.3 Min 2.5 2.5 Max 10.0 10.0 ns ns ns ns ns ns TA = 0C to +70C VCC = +5.0V CL = 250 pF (Note 4) Units 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: 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. 5 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. www.fairchildsemi.com www.fairchildsemi.com This datasheet has been download from: www..com Datasheets for electronics components. |
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