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Figure 6-1. AC Waveforms for Read Operation (1)
Address
Address Valid
CE
t CE
t OE
OE
t DF
Output
High Z
t ACC
Output
Valid
t OH
Notes: 1.
2.
3.
4.
5.
Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless
otherwise specified.
OE may be delayed up to t CE – t OE after the falling edge of CE without impact on t CE .
OE may be delayed up to t ACC – t OE after the address is valid without impact on t ACC .
This parameter is only sampled, and is not 100% tested.
Output float is defined as the point when data is no longer driven.
Figure 6-2. Input Test Waveforms and Measurement Levels
2.40V
AC
Driving
Levels
0.45V
Figure 6-3. Output Test Load
1.3V
(1N914)
3.3K
OUTPUT
PIN
CL
Table 6-2.
Pin Capacitance
f = 1MHz, T = 25 ° C (1)
2.00
0.80
AC
Measurement
Level
Symbol
C IN
C OUT
Typ
4
8
Max
8
12
Units
pF
pF
Conditions
V IN = 0V
V OUT = 0V
Note:
1.
Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
Atmel AT27C040 [DATASHEET]
0189J–EPROM–10/2012
5
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