SN74ACT1284DBR集成电路（IC）的专用逻辑器件规格书PDF中文资料

SN74ACT1284DBR属于集成电路（IC）的专用逻辑器件。由德州仪器制造生产的SN74ACT1284DBR专用逻辑器件专用逻辑 IC 设计提供应用特定的逻辑输出类型，例如 BCD 速率倍增、可寻址扫描端口、总线终端阵列、CML 驱动器、比较器、ABT 扫描测试、二进制全加法器、互补对加逆变器、可配置缓冲器、触点颤动消除器、晶体振荡器、延迟元件、差分接收器、LVTTL 到 GTLP 收发器、存储器解码器、电源良好检测器和分频器。

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

description/ordering information

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.