7721 Group User’s Manual
17–89
Appendix 11. Electrical characteristics
APPENDIX
Microprocessor mode : with no Wait
Note: The limits depend on f(XIN). Table 4 lists calculation formulas for the limits.
Limits
tc
tw(H)
tw(L)
tr
tf
tsu(PiD–E)
th(E–PiD)
External clock input cycle time
External clock input high-level pulse width
External clock input low-level pulse width
External clock input rising time
External clock input falling time
Port Pi input setup time (i = 4–10)
Port Pi input hold time (i = 4–10)
Max.
Parameter
Timing requirements (VCC = 5 V ± 10 %, VSS = 0 V, Ta = –20 to 85 °C, f(XIN) = 25 MHz, unless otherwise noted)
Symbol
Min.
40
15
60
0
Unit
ns
8
Limits
td(E-PiQ)
td(AL–E)
td(E–DHQ)
tpxz(E–DHZ)
td(AM–E)
td(AM–ALE)
td(E–DLQ)
tpxz(E–DLZ)
td(AH–E)
td(AH–ALE)
td(ALE–E)
tw(ALE)
td(BHE–E)
td(BLE–E)
td(R/W–E)
td(E–φ1)
th(E–AL)
th(ALE–AM)
th(E–DHQ)
tpzx(E–DHZ)
th(E–AM)
th(ALE–AH)
th(E–DLQ)
tpzx(E–DLZ)
th(E–BHE)
th(E–BLE)
th(E–R/W)
tw(EL)
tsu(A–DL)
tsu(ALE–DL)
tsu(A–DH)
tsu(ALE–DH)
Port Pi data output delay time (i = 4–10)
Address low-order output delay time
Data high-order output delay time (BYTE = “L”)
Data high-order floating start delay time (BYTE = “L”)
Address middle-order output delay time
Data low-order output delay time
Data low-order floating start delay time
Address high-order output delay time
ALE output delay time
ALE pulse width
____
BHE output delay time
____
BLE output delay time
__
R/W output delay time
φ1 output delay time
Address low-order hold time
Address middle-order hold time (BYTE = “L”)
Data high-order hold time (BYTE = “L”)
Data high-order floating release delay time (BYTE = “L”)
Address middle-order hold time (BYTE = “H”)
Address high-order hold time
Data low-order hold time
Data low-order floating release delay time
____
BHE hold time
____
BLE hold time
__
R/W hold time
E pulse width
Data low-order setup time after address stabilization
Data low-order setup time after rising of ALE
Data high-order setup time after address stabilization
Data high-order setup time after rising of ALE
Max.
Parameter
Switching characteristics (VCC = 5 V ± 10 %, VSS = 0 V, Ta = –20 to 85 °C, f(XIN) = 25 MHz, unless otherwise noted)
Symbol
Min.
15
5
15
5
4
22
20
0
18
9
18
20
18
9
18
20
18
55
Unit
ns
80
35
0
35
0
18
50
55
50
55
Note: Figure 13 shows the test circuit.
(Note)