SN74ACT7200L, SN74ACT7201LA, SN74ACT7202LA

256

× 9, 512 × 9, 1024 × 9

ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES

SCAS221A – FEBRUARY 1993 – REVISED SEPTEMBER 1995

14

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

W

R

XO/HF

tpd(W-XOL)

tpd(W-XOH)

Write to Last

Physical Location

Read From Last

Physical Location

tpd(R-XOL)

tpd(R-XOH)

Figure 9. Expansion-Out Waveforms

W

R

XI

Write to First

Physical Location

Read From First

Physical Location

tw(XIL)

tw(XIH)

tsu(XI-W)

tsu(XI-R)

Figure 10. Expansion-In Waveforms

W

EF

tpd(W-E)

R

th(E-R)

Figure 11. Minimum Timing for an Empty-Flag Coincident-Read Pulse