74ACT818
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74ACT818 - 74ACT818
54ACT 74ACT818 8-Bit Diagnostic Register
54ACT 74ACT818 8-Bit Diagnostic Register
'ACT818 high-speed general-purpose pipeline register with on-board diagnostic register performing serial diagnostics writable control store loading D-to-Y path provides 8-bit parallel data path pipeline register normal system operation diagnostic register load parallel data from pipeline register output data through input port loading) 8-bit diagnostic register multiplexer inputs that select parallel inputs from Y-port adjacent bits diagnostic register operate right-shift-only register This register then participate serial loop throughout system where normal data address status control registers replaced with 'ACT818 diagnostic pipeline registers loop used scan complete test routine starting point (Data Address Then after specified number machine cycles scans results inspected expected results loading accomplished using same technique instruction word serially shifted into shadow register written into enabling output
Features
On-line off-line system diagnostics Swaps contents diagnostic register output register Diagnostic register diagnostic testing Cascadable wide control words used microprogramming Edge-triggered registers Outputs source sink 'ACT818 TTL-compatible inputs 'ACT818 functionally- pin-compatible Am29818 74S818
Applications
Register microprogram control store Status register Data register Instruction register Interrupt mask register Pipeline register General purpose register Parallel-serial serial-parallel converter
Logic Symbol
Connection Diagrams
Assignment Flatpak SOIC Assignment
9801-3
9801 9801
TRI-STATE registered trademark National Semiconductor Corporation FACTis trademark National Semiconductor Corporation C1995 National Semiconductor Corporation
9801
RRD-B30M115 Printed
Names DCLK MODE PCLK
Description Data Inputs Serial Data Input Diagnostics Clock Control Input Pipeline Register Clock Output Enable Input Serial Data Output Data Outputs
Diagnostic Register
9801
Block Diagram
9801
Functional Description
Data transfers into diagnostic register occur LOW-to-HIGH transition DCLK Mode determine what data source will loaded pipeline register loaded LOW-to-HIGH transition PCLK Mode selects whether data source data input diagnostic register output Because independence clock inputs data shifted diagnostic register DCLK loaded into pipeline register from data input PCLK simultaneously long setup hold times violated This simultaneous operation legal
Function Table Inputs MODE DCLK PCLK Outputs Diagnostic SIkSI SOkSDI SIkYI Hold Pipeline PIkDI PIkSI Serial Shift Disabled Normal Load Pipeline Register Load Diagnostic Register from Disabled Load Pipeline Register from Diagnostic Register Hold Diagnostic Register Enabled Operation
HIGH Voltage Level Voltage Level Immaterial LOW-to-HIGH Clock Transition
Absolute Maximum Ratings (Note
Military Aerospace specified devices required please contact National Semiconductor Sales Office Distributors availability specifications Supply Voltage (VCC) Input Diode Current (IIK) Input Voltage (VI) Output Diode Current (IOK) Output Voltage (VO) Output Source Sink Current (IO) Ground Current Output (ICC IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP PDIP
Recommended Operating Conditions
Supply Voltage (VCC) 'ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 74ACT 54ACT Minimum Input Edge Rate 'ACT Devices from
Note Plastic packaging recommended applications requiring greater than 3000 temperature cycles from
Note Absolute maximum ratings those values beyond which damage device occur databook specifications should without exception ensure that system design reliable over power supply temperature output input loading variables National does recommend operation FACT circuits outside databook specifications
Characteristics 'ACT Family Devices
74ACT Symbol Parameter ICCT Minimum High Level Input Voltage Maximum Level Input Voltage Maximum Input Leakage Current Maximum TRI-STATE Leakage Current Maximum Quiescent Supply Current Maximum Additional Input Minimum HIGH Level Output Voltage Outputs Minimum HIGH Level Output Voltage Outputs Maximum Level Output Voltage Outputs Maximum Level Output Voltage Outputs IOLD Minimum Dynamic Output Current Outputs
54ACT
74ACT
Units
Conditions
Guaranteed Limits VOUT VOUT VOUT eb24 VOLD
outputs loaded thresholds input associated with output under test Maximum test duration output loaded time
Characteristics 'ACT Family Devices (Continued)
74ACT Symbol Parameter IOHD Minimum Dynamic Output Current Outputs Minimum Dynamic Output Current Outputs (Note Minimum Dynamic Output Current Outputs (Note 54ACT 74ACT Units Conditions
Guaranteed Limits VOHD
VOLD
IOLD
VOHD
IOHD
Maximum test duration output loaded time Note Test load 500X ground Note 54ACT identical 74ACT
Electrical Characteristics
74ACT Symbol Parameter tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPZL tPLZ tPZL tPLZ tPZH tPHZ tPZH tPHZ Propagation Delay PCLK Propagation Delay PCLK Propagation Delay MODE Propagation Delay MODE Propagation Delay Propagation Delay Propagation Delay DCLK Propagation Delay DCLK Output Enable Time Output Disable Time Output Enable Time DCLK Output Disable Time DCLK Output Enable Time Output Disable Time Output Enable Time DCLK Output Disable Time DCLK 54ACT 74ACT Units
Voltage Range
Operating Requirements
74ACT Symbol Parameter Setup Time PCLK Hold Time PCLK Setup Time MODE PCLK Hold Time MODE PCLK Setup Time DCLK Hold Time DCLK Setup Time MODE DCLK Hold Time MODE DCLK Setup Time DCLK Hold Time DCLK Setup Time DCLK PCLK Setup Time PCLK DCLK Pulse Width PCLK HIGH Pulse Width DCLK HIGH
54ACT
74ACT Units
Guaranteed Minimum
Note Test load 500X ground Voltage range
Capacitance
Symbol Parameter Input Capacitance Power Dissipation Capacitance Units Conditions OPEN
Ordering Information
device number used form part simplified purchasing code where package type temperature range defined follows 74ACT Temperature Range Family 74ACT Commercial TTL-Compatible 54ACT Military TTL-Compatible Device Type Package Code Slim Plastic Slim Ceramic Flatpak Leadless Ceramic Chip Carrier (LCC) Small Outline (SOIC) Special Variations Devices shipped reels Commercial grade device with burn-in Military grade device with environmental burn-in processing shipped tubes Temperature Range Commercial (b40 Military (b55
Physical Dimensions inches (millimeters)
Terminal Ceramic Leadless Chip Carrier Package Number E28A
Lead Slim wide) Ceramic Dual-in-Line Package Package Number J24F
Physical Dimensions inches (millimeters) (Continued)
Lead Small Outline Integrated Circuit Package Number M24B
Lead Slim Wide) Plastic Dual-In-Line Package Package Number N24C
54ACT 74ACT818 8-Bit Diagnostic Register
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION used herein Life support devices systems devices systems which intended surgical implant into body support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user
National Semiconductor Corporation 1111 West Bardin Road Arlington 76017 1(800) 272-9959 1(800) 737-7018
critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
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National Semiconductor Hong Kong 13th Floor Straight Block Ocean Centre Canton Tsimshatsui Kowloon Hong Kong (852) 2737-1600 (852) 2736-9960
National Semiconductor Japan 81-043-299-2309 81-043-299-2408
National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications
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