Specification	SN74ALS640B-1NSR

Current - Output High, Low [custom]	15 mA
Current - Output High, Low [custom]	24 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	3-State
Package / Case	20-SOIC
Package / Case	0.209 "
Package / Case	5.3 mm
Supplier Device Package	20-SO
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	4.5 V

SN74ALS640B-1 Series

OCTAL BUS TRANSCEIVER 3-STATE

Part	Logic Type	Mounting Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Output Type	Package / Case	Package / Case [y]	Package / Case [y]	Operating Temperature [Max]	Number of Elements	Number of Bits per Element	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Supplier Device Package	Package / Case	Package / Case
Texas Instruments SN74ALS640BDWG4	Inverting Transceiver	Surface Mount	4.5 V	5.5 V	3-State	20-SOIC	0.295 in	7.5 mm	70 °C	1	8	15 mA	24 mA	20-SOIC
Texas Instruments SN74ALS640B-1NSR	Inverting Transceiver	Surface Mount	4.5 V	5.5 V	3-State	20-SOIC			70 °C	1	8	15 mA	24 mA	20-SO	0.209 "	5.3 mm
Texas Instruments SN74ALS640BDWR	Inverting Transceiver	Surface Mount	4.5 V	5.5 V	3-State	20-SOIC	0.295 in	7.5 mm	70 °C	1	8	15 mA	24 mA	20-SOIC
Texas Instruments SN74ALS640BDWRE4	Inverting Transceiver	Surface Mount	4.5 V	5.5 V	3-State	20-SOIC	0.295 in	7.5 mm	70 °C	1	8	15 mA	24 mA	20-SOIC
Texas Instruments SN74ALS640BNSR	Inverting Transceiver	Surface Mount	4.5 V	5.5 V	3-State	20-SOIC			70 °C	1	8	15 mA	24 mA	20-SO	0.209 "	5.3 mm
Texas Instruments SN74ALS640B-1N3	Inverting Transceiver	Through Hole	4.5 V	5.5 V	3-State	20-DIP			70 °C	1	8	15 mA	24 mA	20-PDIP	0.3 in	7.62 mm
Texas Instruments SN74ALS640BDW	Inverting Transceiver	Surface Mount	4.5 V	5.5 V	3-State	20-SOIC	0.295 in	7.5 mm	70 °C	1	8	15 mA	24 mA	20-SOIC

Pricing

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

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 4.54
		10	$ 4.08
		25	$ 3.86
		100	$ 3.34
		250	$ 3.17
		500	$ 2.85
		1000	$ 2.40
	Digi-Reel®	1	$ 4.54
		10	$ 4.08
		25	$ 3.86
		100	$ 3.34
		250	$ 3.17
		500	$ 2.85
		1000	$ 2.40
	Tape & Reel (TR)	2000	$ 2.28
Texas Instruments	LARGE T&R	1	$ 3.94
		100	$ 3.45
		250	$ 2.42
		1000	$ 1.95

Description

General part information

SN74ALS640B-1 Series

These octal bus transceivers are designed for asynchronous two-way communication between data buses. These 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 output-enable () input can be used to disable the device so that the buses are effectively isolated.

The -1 version of the SN74ALS640B is identical to the standard version, except that the recommended maximum IOLfor the -1 version is increased to 48 mA. There is no -1 version of the SN54ALS640B.

The SN54ALS640B and SN54AS640 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS640B and SN74AS640 are characterized for operation from 0°C to 70°C.

Documents

Technical documentation and resources

Octal Bus Transceivers With 3-State Outputs datasheet (Rev. A)

Data sheet