4.4 AC Characteristics for Read Operation

Table 4-4. AC Characteristics for Read Operation
ParameterSymbol-45-70UnitsCondition
MinimumMaximumMinimumMaximum
Address to Output DelaytACC(1)—45—70nsCE = OE = VIL
CE to Output DelaytCE(1)—45—70nsOE = VIL
OE to Output DelaytOE(1)—20—30nsCE = VIL
OE or CE High to Output Float, Whichever Occurred FirsttDF(1)—20—25nsOE or CE High to Output Float, Whichever Occurred First
Output hold from address, CE or OE, whichever occurred firsttOH7—7—nsOutput hold from address, CE or OE, whichever occurred first
Note:
  1. See Figure 4-1.
Figure 4-1. AC Waveform for Read Operation
Note:
  1. Timing measurement reference level is 1.5V for -45 devices. Input AC drive levels are VIL = 0.0V and VIH = 3.0V. Timing measurement reference 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.
  3. OE may be delayed up to tACC - tOE after the address is valid without impact on tACC.
  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.
Figure 4-2. Input Test Waveforms and Measurement Levels
Figure 4-3. Output Test Load
Note:
  1. CL = 100 pF including jig capacitance, except for the -45 devices, where CL = 30 pF.