4.4 AC Characteristics for Read Operation

Table 4-4. AC Characteristics for Read Operation
Parameter Symbol -45 -70 Units Condition
Minimum Maximum Minimum Maximum
Address to Output Delay tACC(1) — 45 — 70 ns CE = OE/VPP = VIL
CE to Output Delay tCE(1) — 45 — 70 ns OE/VPP = VIL
OE/VPP to Output Delay tOE(1) — 20 — 30 ns CE = VIL
OE/VPP or CE High to Output Float, Whichever Occurred First tDF(1) — 20 — 25 ns OE/VPP or CE High to Output Float, Whichever Occurred First
Output hold from address, CE or OE/VPP, whichever occurred first tOH 7 — 7 — ns Output hold from address, CE or OE/VPP, 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/VPP may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE.
  3. OE/VPP 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.