Octal Bus Transceivers And Registers With 3-State Outputs

The ?HC646 devices consist of bus-transceiver circuits with 3-state outputs, D-type Flip-Flops and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal Registers Data on the A or B bus is clocked into the Registers on the low-to-high transition of the appropriate Clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that CAN be performed with the ?HC646 devices.
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at the high-impedance port may be stored in either or both Registers
The select-control (SAB and SBA) inputs CAN multiplex stored and real-time (transparent mode) data. DIR determines which bus receives data when OE is active (low). In the isolation mode (OE high), A data may be stored in one Register and/or B data may be stored in the other Register
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
When an output function is disabled, the input function is still enabled and CAN be used to store data. Only one of the two buses, A or B, may be driven at a time.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74HC646NTP1 Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646NT1 Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646DWE4 Rochester Electronics LLC Registered Bus Transceiver, HC/UH Series, 1-Func, 8-Bit, True Output, CMOS, PDSO24, GREEN, PLASTIC, SOIC-24
SN74HC646NTE4 Rochester Electronics LLC Registered Bus Transceiver, HC/UH Series, 1-Func, 8-Bit, True Output, CMOS, PDIP24, ROHS COMPLIANT, PLASTIC, DIP-24
SN74HC646N1 Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646NTP3 Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646DWRG4 Rochester Electronics LLC Registered Bus Transceiver, HC/UH Series, 1-Func, 8-Bit, True Output, CMOS, PDSO24, GREEN, PLASTIC, SOIC-24
SN74HC646FN3 Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646FH Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646JT Rochester Electronics LLC Registered Bus Transceiver,
SN74HC646 's PackagesSN74HC646 's pdf datasheet
SN74HC646DW SOIC
SN74HC646DWE4 SOIC
SN74HC646DWG4 SOIC
SN74HC646DWR SOIC
SN74HC646DWRE4 SOIC
SN74HC646DWRG4 SOIC
SN74HC646NT PDIP
SN74HC646NT3 PDIP
SN74HC646NTE4 PDIP




SN74HC646 Pinout, Pinouts
SN74HC646 pinout,Pin out
This is one package pinout of SN74HC646,If you need more pinouts please download SN74HC646's pdf datasheet.

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