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PDF 54ACT818 Data sheet ( Hoja de datos )
| Número de pieza | 54ACT818 | |
| Descripción | 8-Bit Diagnostic Register | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 1998
www.DataSheet4U.com
54ACT818
8-Bit Diagnostic Register
General Description
The ’ACT818 is a high-speed, general-purpose pipeline reg-
ister with an on-board diagnostic register for performing se-
rial 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 se-
lect parallel inputs from the Y-port or adjacent bits in the di-
agnostic 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 reg-
isters are replaced with ’ACT818 diagnostic pipeline regis-
ters. 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 in-
spected for the expected results. WCS loading can be ac-
complished 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.
Features
n On-line and off-line system diagnostics
n Swaps the contents of diagnostic register and output
register
n Diagnostic register and diagnostic testing
n Cascadable for wide control words as used in
microprogramming
n Edge-triggered D registers
n Outputs source/sink 24 mA
n ’ACT818 has TTL-compatible inputs
n ’ACT818 is functionally- and pin-compatible to AMD
Am29818 and MMI 74S818
n Standard Microcircuit Drawing (SMD) 5962-9160901
Applications
n Register for microprogram control store
n Status register
n Data register
n Instruction register
n Interrupt mask register
n Pipeline register
n General purpose register
n Parallel-serial/serial-parallel converter
Logic Symbol
DS100251-3
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100251
www.national.com
1 page  
DC Characteristics for ’ACT Family Devices (Continued)
Symbol
Parameter
VCC
(V)
IOLD
IOHD
www.DataSheet4U.com
IOLD
IOHD
Minimum Dynamic
Output Current,
Y0–Y7 Outputs
Minimum Dynamic
Output Current,
Y0–Y7 Outputs
Minimum Dynamic
Output Current,
D0–D7, SDO Outputs
(Note 4)
Minimum Dynamic
Output Current,
D0–D7, SDO Outputs
(Note 4)
5.5
5.5
5.5
5.5
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
Note 4: Test load 50 pF, 500Ω to ground.
Note 5: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.
54ACT
TA =
−55˚C to +125˚C
Guaranteed Limits
50
−50
32
−32
Units
mA
mA
mA
mA
AC Electrical Characteristics
Symbol
Parameter
tPHL Propagation Delay
PCLK to Y
tPLH Propagation Delay
PCLK to Y
tPHL Propagation Delay
MODE to SDO
tPLH Propagation Delay
MODE to SDO
tPHL Propagation Delay
SDI to SDO
tPLH Propagation Delay
SDI to SDO
tPHL Propagation Delay
DCLK to SDO
tPLH Propagation Delay
DCLK to SDO
tPZL Output Enable Time
OEY to Yn
tPLZ Output Disable Time
OEY to Yn
tPZL Output Enable Time
DCLK to Dn
VCC
(V)
(Note 6)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
54ACT
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
2.5 10.0
2.5 10.0
3.5 12.0
3.5 13.5
3.0 11.5
3.0 12.0
3.5 14.0
3.5 15.5
2.5 12.0
1.5 10.0
3.0 14.0
5
Conditions
VOLD = 1.65V Max
VOHD = 3.85V Min
VOLD = 1.65V Max
VOHD = 3.85V Min
Units
Fig.
No.
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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