SN74ACT1284数据手册集成电路（IC）的专用逻辑器件规格书PDF

描述 Description

The ’ACT1284 devices are designed for asynchronous two-way communication between data buses. The control function minimizes external timing requirements.
The devices allow data transmission in either the A-to-B or the B-to-A direction for bits 1, 2, 3, and 4, depending on the logic level at the direction-control (DIR) input. Bits 5, 6, and 7, however, always transmit in the A-to-B direction.
The output drive for each mode is determined by the high-drive (HD) control pin. When HD is high, the high drive is delivered by the totem-pole configuration, and when HD is low, the outputs are open drain. This meets the drive requirements as specified in the IEEE 1284-I (level-1 type) and the IEEE 1284-II (level-2 type) parallel peripheral-interface specification.

特性 Features

• 4.5-V to 5.5-V VCC Operation
• Inputs Accept Voltages to 5.5 V
• Max tpd of 20 ns at 5 V
• 3-State Outputs Directly Drive Bus Lines
• Flow-Through Architecture Optimizes PCB Layout
• Center-Pin VCC and GND Configurations Minimize High-Speed Switching Noise
• ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
• 200-V Machine Model (A115-A)
• Designed for the IEEE 1284-I (Level-1 Type) and IEEE 1284-II (Level-2 Type) Electrical Specifications