S1K50000 Epson Electronics America, Inc., S1K50000 Datasheet - Page 70

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

5.2 Simplified Delay Models
STANDARD CELL S1K50000 SERIES
DESIGN GUIDE
The propagation delay time, tpd, is obtained using the equation shown below.
The Typ. values of T
in the “Standard Cell S1K50000-Series MSI Cell Library.” Choose the Typ. values of T
in accordance with the intended power-supply voltage.
The Min. values of T
values (V
said Typ. values by a dispersion coefficient of delay, M. (These Min. and Max. values are
important in verifying that the delay in the circuit is within the desired specifications, even in the
presence of dispersions in V
The dispersion coefficient of delay, M, is calculated as follows:
Although MV and MT can be read out from the characteristic graphs shown in the “Standard
Cell S1K50000-Series MSI Cell Library,” we recommend use of the standard dispersion
coefficients of delay, M, listed in Table 5-1 below. For the dispersion coefficients of delay
outside the standard power-supply-voltage and ambient-temperature ranges, contact Seiko
Epson or its distributor.
Note 1: The delay in a predriver with a level shifter cannot be obtained simply by multiplying the Typ. value by a
t
where MV : coefficient of power-supply-voltage fluctuation
pd
= T
M = MV
where T
Note:
dispersion coefficient of delay, as described above. Precalculated Min. and Max. values are listed along
with the Typ. values in the “Standard Cell S1K50000-Series MSI Cell Library.” See Section 9.4, “Calculating
the Delay Time in a Dual-Power-Supply System,” in this manual.
DD
0
MT : coefficient of ambient-temperature fluctuation
MP : coefficient of process fluctuation
+ K
= lowest value; Ta = highest value; process = Slow) can be obtained by multiplying
The values of T
conditions. Use the values listed in the cell library.
K
Load A : input load capacitance of the connected cell [LU]
Load B : wiring load capacitance [LU]
0
MT
( Load A + Load B)
0
0
and K (V
and K (V
MP
: nonloaded delay [ps]
: coefficient of loaded delay [ps/LU]
0
and K vary depending on the operating voltage, ambient temperature, and process
DD
DD
DD
, Ta, or the process.)
= center value; Ta = 25°C, process = center value) are listed
= highest value; Ta = lowest value; process = Fast) and Max.
EPSON
Chapter 5: Propagation Delay Time and Timing Design
0
and K
65