74LS645 Datasheet | Fairchild Semiconductor

Description These octal bus transceivers are designed for asynchronous two-way munication 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 DM74LS645WM DM74LS645N Package Number M20B N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 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 DM74LS645 DIR L H X B data to A bus A data to B bus Isolation © 2000 Fairchild Semiconductor Corporation DS009056 .fairchildsemi. DM74LS645 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0°C to +70°C - 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 “Remended Operating Conditions” table will define the conditions for actual device operation. Remended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Supply Voltage (Note 2) HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Min 4.75 2 0.6 - 15 24 70 Nom 5 Max 5.25 Units V V V m A m A °C Note 2: Voltage values are with respect to the network ground...