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MC74ACT823N bảng dữ liệu(PDF) 1 Page - Motorola, Inc |
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MC74ACT823N bảng dữ liệu(HTML) 1 Page - Motorola, Inc |
1 / 8 page 5-1 FACT DATA Product Preview 9Bit Register With 3State Outputs (NonInverting) The MC74AC/ACT823 consists of nine D-type edge-triggered flip-flops. This device has 3-state outputs for bus systems, organized in a broadside pinning. In addition to the clock and output enabled pins, the buffered clock (CP) and buffered Output Enable (OE) are common to all flip-flips. The flip-flops will store the state of their individual D inputs that meet the setup and hold time requirements on the LOW-to-HIGH CP transition. With OE LOW, the contents of the flip-flops are available at the outputs. When OE is HIGH, the outputs go to the high impedance state. Operation of the OE input does not affect the state of the flip-flops. The MC74AC/ACT823 has Clear (CLR) and Clock Enable (EN) pins. These devices are ideal for parity bus interfacing in high performance systems. When CLR is LOW, and OE is LOW, the outputs are LOW. When CLR is HIGH, data can be entered into the flip-flops. When EN is LOW, data on the inputs is transferred to the outputs on the LOW-to-HIGH clock transition. When EN is HIGH, the outputs do not change state, regardless of the data or clock input transitions. • 3-State Outputs for Bus Interfacing • Broad Side Pin Configuration • ACT has TTL – Compatible Inputs • High Speed Parallel Positive Edge-Triggered D-Type Flip-Flops • High Performance Bus Interface Buffering for Busses Carrying Parity • Outputs Source/Sink 24 mA Pinout: 24-Lead Packages (Top View) 23 24 22 21 20 19 18 VCC 17 O0 O1 O2 O3 O4 O5 O6 2 1 3 4 5 6 7 8 OE1 D0 D1 D2 D3 D4 D5 D6 16 9 O7 D7 15 10 O8 D8 14 11 EN CLR 13 12 CP GND FUNCTION TABLE Inputs Internal Outputs Operating Mode OE CLR EN CP Dn Q O Operating Mode H X L ↑ L L Z High Z H X L ↑ H H Z High Z H L X X X L Z Clear L L X X X L L Clear H H H X X NC Z Hold L H H X X NC NC Hold H H L ↑ L L Z Load H H L ↑ H H Z Load L H L ↑ L L L Load L H L ↑ H H H Load H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial; Z = High Impedance State; ↑ = LOW-to-High Transition; NC = No Change This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. MC74AC823 MC74ACT823 9-BIT REGISTER WITH 3-STATE OUTPUTS N SUFFIX CASE 724-03 PLASTIC PACKAGE 1 24 PIN NAMES Data Inputs Data Outputs Output Enable Clock Enable Clear Clock Input D0 – D8 O0 – O8 OE EN CLR CP DW SUFFIX CASE 751E-04 SOIC PACKAGE |
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