TSC87251G1A
11. AC Characteristics – Commercial & Industrial
11.1. AC Characteristics – External Bus Cycles
Definition of symbols
Table 43. External Bus Cycles Timing Symbol Definitions
Signals
Conditions
A
D
L
Address
H
L
High
Data In
ALE
Low
V
X
Z
Valid
Q
R
W
Data Out
RD#/PSEN#
WR#
No Longer Valid
Floating
Timings
Test conditions: capacitive load on all pins= 50 pF.
Table 44 lists AC timing parameters for the TSC87251G1A with no wait states. External wait states can be added by
extending PSEN#/RD#/WR# and or by extending ALE. In these tables, Note 2 marks parameters affected by one ALE
wait state, and Note 3 marks parameters affected by one PSEN#/RD#/WR# wait state.
Figure 14 to Figure 19 show the bus cycles with the timing parameters.
36
Rev. A – September 21, 1998
TEMIC [ TEMIC SEMICONDUCTORS ]
