DescriptionThe SN74LS638 is a octal bus transceiver.These octal bus transceivers are designed for asynchronous two-way communication between open-collector and 3state buses. The devices transmit data from the A bus (open-collectop to the B bus (3state) 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 isolated.
Features of the SN74LS638 are:(1)bidirectional bus transceivers in high-density 20-pin packages; (2)hysteresis at bus inputs improves noise margins; (3)choice of true or inverting logic; (4)a bus outputs are open-collector,b bus outputs are 3-state.The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product characteristics. Before ordering, purchasers are advised to contact the Sensitron Semiconductor sales department for the latest version of the datasheet(s).
The absolute maximum ratings of the SN74LS638 can be summarized as:(1)operating free-air temperature range:-55 to 125 ;(2)storage temperature range:-65 to 150;(3)supply voltage:7V;(4)input voltage:7V.The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).
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SN74LS638 Data Sheet
