Specification	SN74HC646DW

Current - Output High, Low [custom]	7.8 mA
Current - Output High, Low [custom]	7.8 mA
Mounting Type	Surface Mount
Number of Bits per Element	8
Number of Elements	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output Type	3-State
Package / Case	24-SOIC
Package / Case [custom]	7.5 mm
Package / Case [custom]	0.295 in
Supplier Device Package	24-SOIC
Voltage - Supply [Max]	6 V
Voltage - Supply [Min]	2 V

SN74HC646 Series

Octal Bus Transceivers And Registers With 3-State Outputs

Part	Number of Bits per Element	Operating Temperature [Max]	Operating Temperature [Min]	Number of Elements	Output Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Package / Case [custom]	Package / Case	Package / Case [custom]	Supplier Device Package	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case
Texas Instruments CD74HC646M	8	125 °C	-55 °C	1	3-State	2 V	6 V	7.5 mm	24-SOIC	0.295 in	24-SOIC	7.8 mA	7.8 mA	Surface Mount
Texas Instruments SN74HC646NT	8			1	3-State	2 V	6 V		24-DIP		24-PDIP	7.8 mA	7.8 mA	Through Hole	85 °C	-40 °C	0.3 in	7.62 mm
Texas Instruments SN74HC646DW	8			1	3-State	2 V	6 V	7.5 mm	24-SOIC	0.295 in	24-SOIC	7.8 mA	7.8 mA	Surface Mount	85 °C	-40 °C
Texas Instruments CD74HC646EN	8	125 °C	-55 °C	1	3-State	2 V	6 V		24-DIP		24-PDIP	7.8 mA	7.8 mA	Through Hole			0.3 in	7.62 mm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 1.93
		10	$ 1.73
		25	$ 1.63
		100	$ 1.39
		250	$ 1.31
		500	$ 1.14
		1000	$ 0.95
Texas Instruments	TUBE	1	$ 1.45
		100	$ 1.20
		250	$ 0.86
		1000	$ 0.65

Description

General part information

SN74HC646 Series

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.

Documents

Technical documentation and resources

SN54HC646, SN74HC646 datasheet (Rev. C)

Data sheet