74ACT818SPC Fairchild Semiconductor, 74ACT818SPC Datasheet

IC REGISTER DIAGNOST 8BIT 24-DIP

74ACT818SPC

Manufacturer Part Number
74ACT818SPC
Description
IC REGISTER DIAGNOST 8BIT 24-DIP
Manufacturer
Fairchild Semiconductor
Series
74ACTr
Datasheet

Specifications of 74ACT818SPC

Logic Type
Register, Pipeline
Output Type
Standard
Number Of Elements
1
Number Of Bits Per Element
8
Function
Universal
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
24-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
74ACT818
© 2000 Fairchild Semiconductor Corporation
74ACT818
8-Bit Diagnostic Register
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 pipe-
line register for normal system operation. The diagnostic
register can load parallel data to or from the pipeline regis-
ter 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 reg-
isters. The loop can be used to scan in a complete test rou-
tine 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.
Ordering Code:
Logic Symbol
FACT
Order Number
74ACT818SPC
is a trademark of Fairchild Semiconductor Corporation.
Order Package
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DS009801
Features
Applications
• Register for microprogram control store
• Status register
• Data register
• Instruction register
• Interrupt mask register
• Pipeline register
• General purpose register
• Parallel-serial/serial-parallel converter
Connection Diagram
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 micropro-
gramming
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
Package Description
July 1988
Revised September 2000
www.fairchildsemi.com

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74ACT818SPC Summary of contents

Page 1

... WCS RAM by enabling the D output. Ordering Code: Order Number Order Package 74ACT818SPC N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Logic Symbol FACT is a trademark of Fairchild Semiconductor Corporation. ...

Page 2

Pin Descriptions Pin Names Description D –D Data Inputs 0 7 SDI Serial Data Input DCLK Diagnostics Clock MODE Control Input PCLK Pipeline Register Clock OEY Output Enable Input SDO Serial Data Output Y –Y Data Outputs 0 7 Function ...

Page 3

Absolute Maximum Ratings Supply Voltage ( Input Diode Current ( 0. 0. Input Voltage ( Output Diode Current ( ...

Page 4

AC Electrical Characteristics Symbol Parameter t Propagation Delay PHL PCLK Propagation Delay PLH PCLK Propagation Delay PHL MODE to SDO t Propagation Delay PLH MODE to SDO t Propagation Delay PHL SDI to SDO ...

Page 5

AC Operating Requirements Symbol Parameter t Setup Time PCLK t Hold Time PCLK t Setup Time H MODE to PCLK t Hold Time H MODE to PCLK t Setup Time DCLK ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at ...

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