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DM74LS645

Fairchild Semiconductor
Part Number DM74LS645
Manufacturer Fairchild Semiconductor
Description Octal Bus Transceiver
Published May 11, 2015
Detailed Description DM74LS645 Octal Bus Transceiver August 1986 Revised March 2000 DM74LS645 Octal Bus Transceiver General Description Th...
Datasheet PDF File DM74LS645 PDF File

DM74LS645
DM74LS645

Overview
DM74LS645 Octal Bus Transceiver August 1986 Revised March 2000 DM74LS645 Octal Bus Transceiver General Description 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 that the buses are effectively isolated.
Features s Bi-directional bus transceivers in high-density 20-pin packages s Hysteresis at bus inputs improves noise margins s 3-STATE outputs Ordering Code: Order Number Package Number Package Description DM74LS645WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.
300 Wide DM74LS645N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.
300 Wide Devices also available in Tape and Reel.
Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table Control Inputs G L L H H = HIGH Level L = LOW Level X = Irrelevant DIR L H X DM74LS645 B data to A bus A data to B bus Isolation © 2000 Fairchild Semiconductor Corporation DS009056 www.
fairchildsemi.
com DM74LS645 Absolute Maximum Ratings(Note 1) Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −55°C to +150°C Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed.
The device should not be operated at these limits.
The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Recommended Operating Conditions Symbol Parameter VCC Supply Voltage (Note 2) VIH HIGH Level Input Voltage VIL LOW Level Input Voltage IOH HIGH Level Output Current IOL LOW Level Output Current TA Free Air Operati...


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