TMS320VC549_16 Datasheet, PDF (14/64 Pages) Texas Instruments – FIXED-POINT DIGITAL SIGNAL PROCESSOR

TMS320VC549
FIXEDĆPOINT DIGITAL SIGNAL PROCESSOR
SPRS078G − SEPTEMBER 1998 − REVISED OCTOBER 2004
PARAMETER MEASUREMENT INFORMATION
timing parameter symbology
Timing parameter symbols used are created in accordance with JEDEC Standard 100-A. To shorten the
symbols, some of the pin names and other related terminology have been abbreviated as follows:
Lowercase subscripts and their meanings:
a
access time
c
cycle time (period)
d
delay time
dis
disable time
en
enable time
f
fall time
h
hold time
r
rise time
su
setup time
t
transition time
v
valid time
w
pulse duration (width)
X
Unknown, changing, or don’t care level
Letters and symbols and their meanings:
H
High
L
Low
V
Valid
Z
High impedance
signal transition reference points
All timing references are made at a voltage of 1.5 volts, except rise and fall times which are referenced at the
10% and 90% points of the specified low and high logic levels, respectively.
Tester Pin _VLoad
Electronics
IOL
50 Ω
C_T
Output
Under
Test
IOH
Where: I_OL = 1.5 mA (all outputs)
I_OH = 300 µA (all outputs)
V_Load = 1.5 V
C_T = 40 pF typical load circuit capacitance.
Figure 1. 3.3-V Test Load Circuit
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