|Category||Logic => Bus Transceivers|
|Description||Octal Bus Transceivers With 3-state Outputs|
|Company||Texas Instruments, Inc.|
|Datasheet||Download SN54ALS640BFK datasheet
Bidirectional Bus Transceivers in High-Density 20-Pin Packages Inverting Logic Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPsdescription
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 (OE) 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 IOL for the -1 version is increased to 48 mA. There no -1 version of the SN54ALS640B. The SN54ALS640B and SN54AS640 are characterized for operation over the full military temperature range to 125°C. The SN74ALS640B and SN74AS640 are characterized for operation from to 70°C.FUNCTION TABLE INPUTS L H DIR H X OPERATION B data to A bus A data to B bus Isolation
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC. 7 V Input voltage, VI: All inputs. 7 V I/O ports. 5.5 V Operating free-air temperature range, TA: to 70°C Storage temperature range. to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
SN54ALS640B MIN VCC VIH VIL IOH IOL Supply voltage High-level input voltage Low-level input voltage High-level output current Low level output current Low-level NOM 5 MAX 5.5 SN74ALS640B MIN NOM 5 MAX 5.5 UNIT mA °C
TA Operating free-air temperature § Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
Outputs disabled All typical values are at VCC = 25°C. Applies only to the -1 version and only if VCC is between 4.75 V and V § For I/O ports, the parameters IIH and IIL include the off-state output current. ¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
VCC = 50 pF, TA = MIN to MAX# SN54ALS640B MIN tPLH tPHL tPZH tPZL tPHZ tPLZ 2 3 MAX SN74ALS640B MIN MAX ns
# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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