UPSD3354DV-40U6 Datasheet, PDF (247/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

UPSD33xx
DC and AC parameters
Table 164. AC signal behavior symbols for timing⁽¹⁾
Letter
Description
t
Time
L
Logic Level low or ALE
H
Logic Level high
V
Valid
X
No Longer a Valid Logic Level
Z
Float
PW
Pulse Width
1. Example: t_AVLX = Time from Address Valid to ALE Invalid.
Figure 86. Switching waveforms – key
WAVEFORMS
INPUTS
OUTPUTS
t(s) ^{STEADY INPUT}
STEADY OUTPUT
uc _{MAY CHANGE FROM}
d _{HI TO LO}
ro _{MAY CHANGE FROM}
P _{LO TO HI}
WILL BE CHANGING
FROM HI TO LO
WILL BE CHANGING
LO TO HI
lete _{DON'T CARE}
Obsolete ^{Product(s) - Obso OUTPUTS ONLY}
CHANGING, STATE
UNKNOWN
CENTER LINE IS
TRI-STATE
AI03102
Doc ID 9685 Rev 7
247/272