
PSD4000 Series
Preliminary Information
74
AC Symbols for PLD Timing.
Example:
t AVLX – Time from Address Valid to ALE Invalid.
Signal Letters
A – Address Input
C – CEout Output
D – Input Data
E – E Input
L – ALE Input
N – Reset Input or Output
P – Port Signal Output
Q – Output Data
R – WR, UDS, LDS, DS, IORD, PSEN Inputs
S – Chip Select Input
T– R/W Input
W– Internal PDN Signal
B– Vstby Output
Signal Behavior
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
Microcontroller
Interface –
PSD4000
AC/DC
Parameters
(3.0 V to 3.6 V
Versions)