SN54ALS580B

• 3-State Buffer-Type Outputs Drive Bus Lines Directly
• Bus-Structured Pinout
• Inverting-Logic Outputs
• Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), Standard Plastic (N) and Ceramic (J) 300-mil DIPs, and Ceramic Flat (W) Packages

Supply voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . . . . . 7 V
Input voltage, V_I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . .. . . . . 5.5 V
Operating free-air temperature range, T_A: SN54ALS580B . . . .. . 55°C to 125°C
                                                                    SN74ALS580B . . .. . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . .  . . . 65°C 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.

These octal D-type transparent latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. SN54ALS580B is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

While the latch-enable (LE) input is high, outputs (Q) respond to the data (D) inputs. When LE is low, the outputs of SN54ALS580B are latched to retain the data that was set up.

A buffered output-enable (OE) input of SN54ALS580B can be used to place the eight outputs in either a normal logic state (high or low) or a high-impedance state. In the high-impedance state, the outputs of SN54ALS580B neither load nor drive the bus lines significantly. The high-impedance state and the increased drive provide the capability to drive bus lines without  interface or pullup components.

OE does not affect internal operations of the latches. Old data of SN54ALS580B can be retained or new data can be entered while
the outputs are in the high-impedance state.

The SN54ALS580B is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS580B and SN74AS580 are characterized for operation from 0°C to 70°C.