Specification	SN74LS640N

Current - Output High, Low [custom]	15 mA
Current - Output High, Low [custom]	24 mA
Logic Type	Transceiver, Inverting
Mounting Type	Through Hole
Number of Bits per Element	8
Number of Elements	1
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Type	3-State
Package / Case	20-DIP
Package / Case	7.62 mm
Package / Case	0.3 in
Supplier Device Package	20-PDIP
Voltage - Supply [Max]	5.25 V
Voltage - Supply [Min]	4.75 V

SN74LS640 Series

Octal bus transceivers

Part	Output Type	Supplier Device Package	Logic Type	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Package / Case	Package / Case [y]	Package / Case [y]	Operating Temperature [Max]	Number of Bits per Element	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Number of Elements	Package / Case	Package / Case
Texas Instruments SN74LS640-1DW	3-State	20-SOIC	Inverting Transceiver	15 mA	48 mA	20-SOIC	0.295 in	7.5 mm	70 °C	8	4.75 V	5.25 V	Surface Mount	1
Texas Instruments SN74LS640NSR	3-State	20-SO	Inverting Transceiver	15 mA	24 mA	20-SOIC			70 °C	8	4.75 V	5.25 V	Surface Mount	1	0.209 "	5.3 mm
Texas Instruments SN74LS640N	3-State	20-PDIP	Inverting Transceiver	15 mA	24 mA	20-DIP			70 °C	8	4.75 V	5.25 V	Through Hole	1	0.3 in	7.62 mm
Texas Instruments SN74LS640DB	3-State	20-SSOP	Inverting Transceiver	15 mA	24 mA	20-SSOP			70 °C	8	4.75 V	5.25 V	Surface Mount	1
Texas Instruments SN74LS640-1NS	3-State	20-SO	Inverting Transceiver	15 mA	48 mA	20-SOIC			70 °C	8	4.75 V	5.25 V	Surface Mount	1	0.209 "	5.3 mm
Texas Instruments SN74LS640DWR	3-State	20-SOIC	Inverting Transceiver	15 mA	24 mA	20-SOIC	0.295 in	7.5 mm	70 °C	8	4.75 V	5.25 V	Surface Mount	1

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	$ 2.53
		20	$ 2.27
		40	$ 2.14
		100	$ 1.82
		260	$ 1.71
		500	$ 1.50
		1000	$ 1.24
		2500	$ 1.16
		5000	$ 1.11
Texas Instruments	TUBE	1	$ 2.09
		100	$ 1.72
		250	$ 1.24
		1000	$ 0.93

Description

General part information

SN74LS640 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