9
AC CHARACTERISTICS
External I/O or Memory Read and Write Timing Table
No Symbol Parameter V
CC
TA = 0°C to +70°CT
A
= -40°C to +105°C Units Notes
Note[3] 8 MHz 12 MHz 8 MHz 12 MHz
Min Max Min Max Min Max Min Max
1 TdA(AS) Address Valid to 3.3 55 35 55 35 ns [2]
/AS Rising Delay 5.0 55 35 55 35 ns
2 TdAS(A) /AS Rising to Address 3.3 70 45 70 45 ns [2]
Float Delay 5.0 70 45 70 45 ns
3 TdAS(DR) /AS Rising to Read 3.3 400 250 400 250 ns [1,2]
Data Required Valid 5.0 400 250 400 250 ns
4 TwAS /AS Low Width 3.3 80 55 80 55 ns [2]
5.0 80 55 80 55 ns
5 Td Address Float to 3.3 0 0 0 0 ns
/DS Falling 5.0 0 0 0 0 ns
6 TwDSR /DS (Read) Low Width 3.3 300 200 300 200 ns [1,2]
5.0 300 200 300 200 ns
7 TwDSW /DS (Write) Low Width 3.3 165 110 165 110 ns [1,2]
5.0 165 110 165 110 ns
8 TdDSR(DR) /DS Falling to Read 3.3 260 150 260 150 ns [1,2]
Data Required Valid 5.0 260 160 260 160 ns
9 ThDR(DS) Read Data to 3.3 0 0 0 0 ns [2]
/DS Rising Hold Time 5.0 0 0 0 0 ns
10 TdDS(A) /DS Rising to Address 3.3 85 45 85 45 ns [2]
Active Delay 5.0 95 55 95 55 ns
11 TdDS(AS) /DS Rising to /AS 3.3 60 30 60 30 ns [2]
Falling Delay 5.0 70 45 70 45 ns
12 TdR/W(AS) R//W Valid to /AS 3.3 70 45 70 45 ns [2]
Rising Delay 5.0 70 45 70 45 ns
13 TdDS(R/W) /DS Rising to 3.3 70 45 70 45 ns [2]
R//W Not Valid 5.0 70 45 70 45 ns
14 TdDW(DSW) Write Data Valid to /DS 3.3 80 55 80 55 ns [2]
Falling (Write) Delay 5.0 80 55 80 55 ns
15 TdDS(DW) /DS Rising to Write 3.3 70 45 70 45 ns [2]
Data Not Valid Delay 5.0 80 55 80 55 ns
16 TdA(DR) Address Valid to Read 3.3 475 310 475 310 ns [1,2]
Data Required Valid 5.0 475 310 475 310 ns
17 TdAS(DS) /AS Rising to 3.3 100 65 100 65 ns [2]
/DS Falling Delay 5.0 100 65 100 65 ns
18 TdDI(DS) Data Input Setup to 0.0 115 115 115 115 ns [1,2]
/DS Rising 5.0 75 75 75 75 ns
19 TdDM(AS) /DM Valid to /AS 3.3 55 35 55 35 ns [2]
Falling Delay 5.0 55 35 55 35 ns
Notes:
[1] When using extended memory timing add 2 TpC.
[2] Timing numbers given are for minimum TpC.
[3] 5.0V ±0.5V, 3.3V ±0.3V.
Standard Test Load
All timing references use 0.9 VCC for a logic 1 and 0.1 VCC for a logic 0.