Specification	SN74LS642-1DW

Current - Output High, Low [custom]	-
Current - Output High, Low [custom]	48 mA
Logic Type	Transceiver, Inverting
Mounting Type	Surface Mount
Number of Bits per Element	8
Number of Elements	1
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Type	Open Collector
Package / Case	20-SOIC
Package / Case [y]	0.295 in
Package / Case [y]	7.5 mm
Supplier Device Package	20-SOIC
Voltage - Supply [Max]	5.25 V
Voltage - Supply [Min]	4.75 V

SN74LS642 Series

Octal bus transceivers with open collector outputs

Part	Number of Bits per Element	Package / Case	Package / Case [y]	Package / Case [y]	Supplier Device Package	Number of Elements	Mounting Type	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Output Type	Operating Temperature [Max]	Logic Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Package / Case	Package / Case
Texas Instruments SN74LS642-1DW	8	20-SOIC	0.295 in	7.5 mm	20-SOIC	1	Surface Mount	-	48 mA	Open Collector	70 °C	Inverting Transceiver	4.75 V	5.25 V
Texas Instruments SN74LS642NSR	8	20-SOIC			20-SO	1	Surface Mount	-	24 mA	Open Collector	70 °C	Inverting Transceiver	4.75 V	5.25 V	0.209 "	5.3 mm
Texas Instruments SN74LS642-1N	8	20-DIP			20-PDIP	1	Through Hole	-	48 mA	Open Collector	70 °C	Inverting Transceiver	4.75 V	5.25 V	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	$ 7.71
Texas Instruments	TUBE	1	$ 6.79
		100	$ 5.53
		250	$ 4.35
		1000	$ 3.69

Description

General part information

SN74LS642 Series

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control (DIR) input. The enable input (G) can be used to disable the device so the buses are effectively isolated.

The -1 versions of the SN74LS640 thru SN74LS642, SN74LS644, and SN74LS645 are identical to the standard versions except that the recommended maximum IOLis increased to 48 milliamperes. There are no -1 versions of the SN54LS640 thru SN54LS642, SN54LS644, and SN54LS645.

The SN54LS640 thru SN54LS642, SN54LS644, and SN54LS645 are characterized for operation over the full military tempearture range of –55°C to 125°C. The SN74LS640 thru SN74LS642, SN74LS644, and SN74LS645 are characterized for operation from 0°C to 70°C.

Documents

Technical documentation and resources

SN54LS64x, SN74LS64x Octal Bus Transceivers datasheet (Rev. A)

Data sheet