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74ACT818SDC, 74ACT818SPC, 74ACT821

Table of contents:
Info of 74ACT818SDC
Info of 74ACT818SPC
Info of 74ACT821

74ACT818SDC, 74ACT818SPC, 74ACT821 Selling Leads, Datasheet

MFG:NS Package Cooled:DIP D/C:99+

74ACT818SDC, 74ACT818SPC, 74ACT821 Picture

74ACT818SDC, 74ACT818SPC, 74ACT821 Datasheet download

Five Points

Part Number: 74ACT818SDC

MFG: NS

Package Cooled: DIP

D/C: 99+

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74ACT818SPC General Description

The ACT818 is a high-speed, general-purpose pipeline register with an on-board diagnostic register for performing serial diagnostics and/or writable control store loading.

The D-to-Y path provides an 8-bit parallel data path pipeline register for normal system operation. The diagnostic register can load parallel data to or from the pipeline register and can output data through the D input port (as in WCS loading).

The 8-bit diagnostic register has multiplexer inputs that select parallel inputs from the Y-port or adjacent bits in the diagnostic register to operate as a right-shift-only register. This register can then participate in a serial loop throughout the system where normal data, address, status and control registers are replaced with ACT818 diagnostic pipeline registers. The loop can be used to scan in a complete test routine starting point (Data, Address, etc.). Then after a specified number of machine cycles it scans out the results to be inspected for the expected results. WCS loading can be accomplished using the same technique. An instruction word can be serially shifted into the shadow register and written into the WCS RAM by enabling the D output.

74ACT818SPC Maximum Ratings

Supply Voltage (V_CC).................. −0.5V to +7.0V
DC Input Diode Current (I_IK)
    V_I = −0.5V ......................................... −20 mA
    V_I = VCC + 0.5V................................. +20 mA
DC Input Voltage (V_I) .........−0.5V to V_CC + 0.5V
DC Output Diode Current (I_OK)
    V_O = −0.5V........................................ −20 mA
    V_O = V_CC + 0.5V +20 mA
DC Output Voltage (V_O) ......−0.5V to V_CC + 0.5V
DC Output Source
    or Sink Current (I_O)............................ ±50 mA
DC V_CC or Ground Current
    per Output Pin (I_CC or I_GND)............... ±50 mA
Storage Temperature (T_STG)... −65°C to +150°C
Junction Temperature (T_J)
    PDIP ......................................................140°C

74ACT818SPC Features

On-line and off-line system diagnostics
Swaps the contents of diagnostic register and output register
Diagnostic register and diagnostic testing
Cascadable for wide control words as used in microprogramming
Edge-triggered D registers
Outputs source/sink 24 mA
ACT818 has TTL-compatible inputs
ACT818 is functionally- and pin-compatible to AMD Am29818 and MMI 74S818

74ACT818SPC Typical Application

• Register for microprogram control store
• Status register
• Data register
• Instruction register
• Interrupt mask register
• Pipeline register
• General purpose register
• Parallel-serial/serial-parallel converter

74ACT818SPC Connection Diagram

74ACT821 General Description

The AC/ACT821 is a 10-bit D-type flip-flop with 3-STATE outputs arranged in a broadside pinout.

74ACT821 Maximum Ratings

74ACT821 Features

3-STATE outputs for bus interfacing
Noninverting outputs
Outputs source/sink 24 mA
TTL compatible inputs

74ACT821 Connection Diagram

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