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74F2645 Octal Bus Transceiver
November 1989 Revised August 1999
74F2645 Octal Bus Transceiver with 25 Series Resistors in the Outputs
General Description
This device is an octal bus transceiver designed for asynchronous two-way data flow between the A and B busses and is functionally equivalent to the 74F645. The 25 series resistors in the outputs reduce ringing and eliminate the need for external resistors. Both busses are capable of sinking 12 mA, sourcing 15 mA, have 3-STATE outputs, and a common output enable pin. The direction of data flow is determined by the transmit/receive (T/R) input. The 74F2645 is a low power version of the 74F245 with 25 series resistors in the outputs.
Features
s 25 series resistors in the outputs eliminates the need for external resistors s Designed for asynchronous two-way data flow between busses s Outputs sink 12 mA and source 15 mA s Transmit/receive (T/R) input controls the direction of data flow s 74F2645 is a low power version of the 74F245 with 25 series resistors in the outputs
Ordering Code:
Order Number 74F2645SC 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" to the ordering code.
Logic Symbol
Connection Diagram
FAST(R) is a registered trademark of Fairchild Semiconductor Corporation.
(c) 1999 Fairchild Semiconductor Corporation
DS010629
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74F2645
Unit Loading/Fan Out
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 U.L. HIGH/LOW 1.0/1.0 1.0/1.0 3.5/0.667 750/20 3.5/0.667 750/20 Input IIH/IIL Output IOH/IOL 20 A/-0.6 mA 20 A/-0.6 mA 70 A/-0.4 mA -15 mA/12 mA 70 A/-0.4 mA -15 mA/12 mA
Functional Description
The output enable (OE) is active LOW. If the device is disabled (OE HIGH), the outputs are in the high impedance state. The transmit/receive input (T/R) controls whether data is transmitted from the A bus to the B bus or from the B bus to the A bus. When T/R is LOW, B data is sent to the A bus. If T/R is HIGH, A data is sent to the B bus.
Function Table
Inputs Outputs OE L L H
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance State
T/R L H X Bus B data to Bus A Bus A data to Bus B Z
Logic Diagram
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74F2645
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 IIH IBVI IBVIT ICEX VID IOD IIL IIH + IOZH IIL + IOZL IOS IZZ ICCL ICCZ Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current Input HIGH Current Breakdown Test Input HIGH Current Breakdown (I/O) Output HIGH Leakage Current Input Leakage Test Output Leakage Circuit Current Input LOW Current Output Leakage Current Output Leakage Current Output Short-Circuit Current Bus Drainage Test Power Supply Current (74F2645) Power Supply Current (74F2645) -100 4.75 3.75 -0.6 70 -650 -225 500 82 95 10% VCC 10% VCC 10% VCC 2.0 0.50 0.75 5.0 7.0 0.5 50 Min 2.0 0.8 -1.2 Typ Max Units V V V V V A A mA A V A mA A A mA A mA mA Min Min Min Max Max Max Max 0.0 0.0 Max Max Max Max 0.0V Max Max VCC Conditions Recognized as a HIGH Signal Recognized as a LOW Signal IIN = -18 mA (Non I/O Pins) IOH = -15 mA (An, Bn) IOL = 1 mA (An, Bn) IOL = 12 mA (A n, Bn) VIN = 2.7V (Non I/O Pins) VIN = 7.0V (Non I/O Pins) VIN = 5.5V (An, Bn) VOUT = VCC IID = 1.9 A All Other Pins Grounded VIOD = 150 mV All Other Pins Grounded VIN = 0.5V (Non I/O Pins) VOUT = 2.7V (An, Bn) VOUT = 0.5V (An, Bn) VOUT = 0V VOUT = 5.25 VO = LOW, VIN = 0.2V VO = HIGH Z
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74F2645
AC Electrical Characteristics
TA = +25C Symbol Parameter Min tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Propagation Delay A Input to B Output Propagation Delay B Input to A Output Enable Time OE Input to A Output Disable Time OE Input to A Output Enable Time OE Input to B Output Disable Time OE Input to B Output 1.5 2.5 1.5 2.5 2.5 2.5 1.5 1.0 2.5 2.5 1.5 1.0 VCC = +5.0V CL = 50 pF Typ Max 6.0 7.5 6.0 7.5 8.0 8.5 7.0 5.5 7.5 8.5 6.5 6.5 TA = 0C to +70C VCC = +5.0V CL = 50 pF Min 1.5 2.5 1.5 2.5 2.0 2.0 1.0 1.0 2.0 2.5 1.0 1.0 Max 7.0 8.0 7.0 8.0 9.0 8.5 8.0 5.5 9.5 9.0 7.5 6.5 ns ns ns ns Units
Basic FAST Circuit Showing Series Resistor Placement
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74F2645 Octal Bus Transceiver
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
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