Specification	SN74HCT646DW

Current - Output High, Low [custom]	6 mA
Current - Output High, Low [custom]	6 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]	5.5 V
Voltage - Supply [Min]	4.5 V

SN74HCT646 Series

Octal Bus Transceivers And Registers With 3-State Outputs

Part	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Output Type	Number of Elements	Number of Bits per Element	Package / Case [custom]	Package / Case	Package / Case [custom]	Voltage - Supply [Min]	Voltage - Supply [Max]	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Mounting Type	Package / Case	Package / Case
Texas Instruments SN74HCT646DWR	85 °C	-40 °C	24-SOIC	3-State	1	8	7.5 mm	24-SOIC	0.295 in	4.5 V	5.5 V	6 mA	6 mA	Surface Mount
Texas Instruments SN74HCT646NT	85 °C	-40 °C	24-PDIP	3-State	1	8		24-DIP		4.5 V	5.5 V	6 mA	6 mA	Through Hole	0.3 in	7.62 mm
Texas Instruments SN74HCT646DW	85 °C	-40 °C	24-SOIC	3-State	1	8	7.5 mm	24-SOIC	0.295 in	4.5 V	5.5 V	6 mA	6 mA	Surface Mount

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	$ 1.77
		10	$ 1.59
		25	$ 1.50
		100	$ 1.28
		250	$ 1.20
		500	$ 1.05
		1000	$ 0.87
		2500	$ 0.81
		5000	$ 0.78
Texas Instruments	TUBE	1	$ 1.53
		100	$ 1.26
		250	$ 0.91
		1000	$ 0.68

Description

General part information

SN74HCT646 Series

The ’HCT646 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 ’HCT646 devices.

Output-enable (OE)\ and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at the high-impedance port can 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 can be stored in one register and/or B data can be stored in the other register.

Documents

Technical documentation and resources

SN54HCT646, SN74HCT646 datasheet (Rev. C)

Data sheet