T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
6 Functional Modules (continued)
6.14 External Program Memory Characteristics
Table 20. External Program Memory Characteristics (Use with Figure 4 through Figure 6.)
Each timing symbol has five characters. The first character is always a T (time). The other characters, depending
on their positions, stand for the name of a signal or the logical status of that signal. The following list identifies each
character:
Character
Meaning
Address
Clock
Character
Meaning
Output data
RD signal
A
C
D
H
I
Q
R
T
V
W
X
Z
Input data
Logic level high
Instruction (program memory contents)
Logic level low, or ALE
PSEN
Time
Valid
WR signal
No longer a valid logic level
Float
L
P
TA = 0 °C to 70 °C, VCC = 5 V ± 10%; VSS = 0 V; load capacitance for port 0, ALE, and PSEN = 100 pF; load capac-
itance for all other outputs = 80 pF.
Symbol
Parameter
Min
Max
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1/TCLCL Oscillator Frequency
—
15.36
TAVDV
TAVIV
Address Valid to Valid Data In
—
9TCLCL – 100
Address Valid to Valid Instruction In
Address Valid to ALE Low
Address to RD or WR Low
ALE Pulse Width
—
TCLCL – 40
4TCLCL – 40
2TCLCL – 40
TCLCL – 35
—
3TCLCL – 100
TAVLL
—
TAVWL
TLHLL
TLLAX
TLLDV
TLLIV
—
—
Address Hold After ALE Low
ALE Low to Valid Data In
ALE Low to Valid Instruction In
ALE Low to PSEN Low
ALE Low to RD or WR Low
PSEN Low to Address Float
PSEN Low to Valid Instruction In
PSEN Pulse Width
—
8TCLCL – 100
—
4TCLCL – 100
TLLPL
TLLWL
TPLAZ
TPLIV
TCLCL – 25
3TCLCL – 50
—
—
3TCLCL + 50
20
—
3TCLCL – 100
TPLPH
TPXAV
TPXIX
3TCLCL – 40
TCLCL – 8
0
—
PSEN to Address Valid
Instruction Hold After PSEN
Instruction Float After PSEN
Data Valid to Write High
Data Valid to Write Transition
Data Hold After RD
—
—
TPXIZ
—
TCLCL – 20
TQVWH
TQVWX
TRHDX
TRHDZ
TRLAZ
TRLDV
TRLRH
TWHLH
TWHQX
TWLWH
7TCLCL – 100
TCLCL – 50
0
—
—
—
Data Float After RD
—
2TCLCL – 50
RD Low to Address Float
RD Low to Valid Data In
RD Pulse Low
—
20
—
5TCLCL – 100
6TCLCL – 50
TCLCL – 40
TCLCL – 50
6TCLCL – 50
—
RD or WR High to ALE High
Data Hold After WR
TCLCL + 40
—
—
WR Pulse Low
26
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