AT27C256R
AC Waveforms for Read Operation (1)
Notes: 1. Timing measurement reference level is 1.5V for -45
and -55 devices. Input AC drive levels are VIL =
3. OE may be delayed up to tACC - tOE after the address is valid
without impact on tACC
.
0.0V and VIH = 3.0V. Timing measurement refer-
4. This parameter is only sampled and is not 100% tested.
5. Output float is defined as the point when data is no longer
driven.
ence levels for all other speed grades are VOL
=
0.8V and VOH = 2.0V. Input AC drive levels are VIL
= 0.45V and VIH = 2.4V.
2. OE may be delayed up to tCE - tOE after the falling
edge of CE without impact on tCE
.
Input Test Waveforms and Measurement Levels
Output Test Load
For -45 and -55 devices only:
tR, tF < 5 ns (10% to 90%)
For -70, -90, -12, and -15 devices:
Note:
CL= 100 pF including jig
capacitance, except for
the -45 and -55 devices,
where CL= 30 pF.
tR, tF < 20 ns (10% to 90%)
Pin Capacitance (f = 1MHz, T = 25°C) (1)
Typ
4
Max
6
Units
pF
Conditions
C
C
V
V
= 0V
IN
IN
8
12
pF
= 0V
OUT
OUT
Note: 1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
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