AC Parameters
AC Test Conditions
Input Pulse Levels: GND to 3.0V
Input Rise/Fall Times: 5 ns
Output Reference Levels: 1.5V
Output Load: See Figures 2, 3
Input Timing Reference Levels: 1.5V
Figure 2. Output Load
Figure 3. Output Load (for tHZ, tLZ, tWZ, and tOW)
(1)
1
(1)
1
Note:
1. Including scope and jig.
AC Read Characteristics
Table 7. Over the Full Operating Temperature and Supply Voltage Range
M
M
Read Cycle
67025-30
67025-45
Symbol(4)
TAVAVR
TAVQV
TELQV
TBLQV
TGLQV
TAVQX
TELQX
TEHQZ
TPU
Symbol(5)
tRC
Parameter
Min.
Max.
–
Min.
Max.
–
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Read cycle time
30
–
45
–
tAA
Address access time
30
30
30
15
–
45
45
45
25
–
tACS
tABE
tAOE
tOH
Chip Select access time(3)
Byte enable access time(3)
Output enable access time
Output hold from address change
Output low Z time (1) (2)
–
–
–
–
–
–
3
3
tLZ
3
–
5
–
tHZ
Output high Z time (1) (2)
–
15
–
–
20
–
tPU
Chip Select to power up time (2)
Chip disable to power down time (2)
SEM flag update pulse (OE or SEM)
Semaphore Access time(3)
0
0
TPD
tPD
–
50
–
–
50
–
TSOP
tSOP
tACS
15
–
15
–
TSLQV
30
45
Notes: 1. Transition is measured +500 mV from low or high impedance voltage with load (Figure 2 and Figure 3).
2. This parameter is guaranteed but not tested.
3. To access RAM CS = VIL, UB or LB = VIL, SEM = VIH. To access semaphore CS = VIH, SEM = VIL. Refer to Table 1.
4. STD symbol.
5. ALT symbol.
13
M67025E
4146J–AERO–06/03
ATMEL [ ATMEL ]
