tb302

Notice To Specification Change HSP48901
TM
Technical Brief
April 1998
TB302.1
Introduction
This is notification of a change to the TLCS Specification of
the HSP48901. The new specification is:
-30 (30MHz)
-20 (20MHz)
itle (TB302)
PARAMETER
SYMBOL Change
MIN
MAX
MIN
bject
30 (Notice
To Specification
HSP48901)
thor () LD Setup Time
40
TLCS
31
TCYbywords ()
CLE
+2
teator ()
The
Old Specification Was:
otice
CINFO
pdfmark
-30 (30MHz)
eciageMode /UseOutlines
PARAMETER
SYMBOL
a-CVIEW pdfmark
LD Setup Time
TLCS
n
ang
This parameter specifies the timing for changing the configuration of the part while processing data. This applies mainly
to loading coefficients and changing coefficient banks. It
does not affect customers who change the part’s configuration asynchronously or during periods when no valid data is
processed.
MAX
TCY-
This change is being made to achieve a closer match with
the specifications for the parts that would be used to generate these signals.
CLE
+2
A circuit for implementing this function with the new timing is
shown below. The two 74ACT32 gates shown must be in the
same package in order to minimize timing skew between
them. Using this circuit, the skew will typically be less than 2
nanoseconds over temperature, so that the rising edge of LD
will be nearly coincident with the rising edge of CLK, causing
LD to take effect during the following clock cycle. By cascading two 74ACT374’s, the timing skew with the rest of the system is eliminated; the first synchronizes the output with the
local (delayed) clock, while the second synchronizes the output with the rest of the system.
-20 (20MHz)
MIN
MAX
MIN
MAX
28
-
40
-
P48
1)
utho
eyrds
terrpoion,
ictor)
er ()
OCI
O
frk
74ACT374
SYSTEM CLK
DOUT
LD
SYNCHRONOUS
LOAD
74ACT374
D Q
D Q
>
>
CLK
74ACT32
HSP48901
FIGURE 1.
gede
setes
OC-
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Technical Brief 302
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