|Category||Logic => Bus Interface => Bus Oriented Circuits|
|Title||Bus Oriented Circuits|
|Description||Octal Bus Transceiver With 3-STATE Outputs|
|Datasheet||Download 74F645 datasheet
These devices are octal bus transceivers designed for asynchronous two-way data flow between the A and B busses. Both busses are capable of sinking 64 mA, have 3STATE outputs, and a common output enable pin. The direction of data flow is determined by the transmit/receive (T/R) input. The is a high speed/low power version of the 74F245. The is an inverting option of the 74F645.Features
s Designed for asynchronous two-way data flow between busses s Outputs sink mA s Transmit/receive (T/R) input controls the direction of data flow is a lower power, faster version of the is an inverting option of the 74F645
Order Number 74F640PC 74F645PC Package Number M20B N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 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.
Pin Names OE T/R A0A7 B0B7 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 Input IIH/IIL Output IOH/IOL mA/64 mA
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.
Inputs L H T/R X 74F640 Bus B data to Bus A Bus A data to Bus B Z Outputs 74F645 Bus B data to Bus A Bus A data to Bus B ZH = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance State
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) -0.5V to VCC +5.0 mA
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.
Symbol VIH VIL VCD VOH VOL IIH IBVI IBVIT ICEX VID IOD IIL IIH + IOZH IIL + IOZL IOS IZZ ICCH ICCL ICCZ ICCH 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 (74F640) Power Supply Current (74F640) Power Supply Current (74F640) Power Supply Current (74F645) Power Supply Current (74F645) Power Supply Current (74F645) VCC 10% VCC Min 0.8 -1.2 Typ Max Units µA mA Min Max 0.0 Max 0.0V 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 (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 µA 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 VO = HIGH, VIN VO = LOW VO = HIGH VO = HIGH VO = LOW, VIN VO = HIGH Z
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