Parameter Information - Texas Instruments TMS320C6722 User Manual

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4.5 Parameter Information

4.5.1 Parameter Information Device-Specific Information
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4.0 pF
A. The data sheet provides timing at the device pin. For output timing analysis, the tester pin electronics and its
transmission line effects must be taken into account. A transmission line with a delay of 2 ns or longer can be used to
produce the desired transmission line effect. The transmission line is intended as a load only. It is not neccessary to
add or subtract
Input requirements in this data sheet are tested with an input slew rate of < 4 Volts per nanosecond (4 V/ns) at the
device pin.
4.5.1.1 Signal Transition Levels
All input and output timing parameters are referenced to 1.5 V for both "0" and "1" logic levels.
Figure 4-2. Input and Output Voltage Reference Levels for AC Timing Measurements
All rise and fall transition timing parameters are referenced to V
V MAX and V
OL OH
Figure 4-3. Rise and Fall Transition Time Voltage Reference Levels
4.5.1.2 Signal Transition Rates
All timings are tested with an input edge rate of 4 Volts per nanosecond (4 V/ns).
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Tester Pin Electronics
3.5 nH
Transmission Line
Z0 = 50
(see note)
1.85 pF
the transmission line delay
Figure 4-1. Test Load Circuit for AC Timing Measurements
MIN for output clocks.
TMS320C6727, TMS320C6726, TMS320C6722
Floating-Point Digital Signal Processors
SPRS268E – MAY 2005 – REVISED JANUARY 2007
Data Sheet Timing Reference Point
(2 ns or longer) from
MAX and V
IL
V = V
ref
V = V
ref
Peripheral and Electrical Specifications
Output
Under
Test
Device Pin
(see note)
the data sheet timings.
V = 1.5 V
ref
MIN for input clocks,
IH
MIN (or V MIN)
IH OH
MAX (or V MAX)
IL OL
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