S1K50000 Epson Electronics America, Inc., S1K50000 Datasheet - Page 123

• Manufacturer Part Number: S1K50000
• Description: Design Guide S1k50000 Series
• Manufacturer: Epson Electronics America, Inc.

Chapter 9: Precautions on the Use of Dual Power Supplies
9.4 Calculating the Delay Time in a Dual-Power-Supply System
118
In a dual-power-supply system, the dispersion coefficients of delay M, listed in Table 5-1, may
not be used for some types of buffers, as specified below.
For these types of buffers, the Min., Typ., and Max values of T
reference in the “Standard Cell S1K50000-Series MSI Cell Library.” Choose the appropriate
T
calculation of the delay time.
1) Calculating delay time (Typ. value)
2) Calculating the delay times (Min. and Max. values) and dispersion of delay coefficients
0
and K values in accordance with the operating conditions, and use the selected values in
The following are buffers for which the dispersion coefficients of delay M, listed in Table 5-1,
cannot be used:
The delay time (Typ. value) in a dual-power-supply system is calculated in the same way as
for a single-power-supply system. Because a highly accurate delay-time calculation
environment is provided, please note that the delay calculations are not in agreement with
those performed using the values listed in the “Standard Cell S1K50000-Series MSI Cell
Library.” When calculating the delay time in input and output buffers, use the T
K (Typ.) values suited for the respective operating voltages of the HV
buffers.
To calculate the delay time in the internal cell (Typ. value), use the T
values suited for the operating voltages of the LV
In the case of a single-power-supply system, the Max. and Min. values of the delay time are
obtained simply by multiplying the Typ. value by the coefficient M (Table 5-1). For a dual-
power-supply system, on the other hand, because the dispersion coefficient of delay differs
between HV
in each cell. Then, total the delay time of each cell thus obtained to find the Max. and Min.
values of delay time in the entire circuit.
However, for operation with a dual-power-supply system, the dispersion coefficients of
delay M, listed in Table 5-1, cannot be used for some types of buffers such as XHIBC or
XHBC*T. To find the Min. value of the delay time in such buffers, for example, use the Min.
values of T
Similarly, to find the Max. value of the delay time, use the Max. values of T
in the cell library to calculate the Max. value of the delay time.
• HV
• HV
DD
DD
-system input buffers (e.g., XHIBC, XHIBH)
-system bidirectional buffers (e.g., XHBC*T, XHBH*T)
0
DD
and K available in the cell library to calculate the Min. value of delay time.
- and LV
DD
-system cells, first find the Max. and Min. values of the delay time
EPSON
DD
-system buffers.
0
and K are listed for your
STANDARD CELL S1K50000 SERIES
0
DD
(Typ.) and K (Typ.)
and LV
0
and K available
0
DD
DESIGN GUIDE
(Typ.) and
-system