29109BRA 데이터 시트보기 (PDF) - Intersil
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29109BRA Datasheet PDF : 8 Pages
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Timing Waveforms (Continued)
HM-65262
(8) TAVAX
A
(17) TAVWH
(12) TWHAX
(9) TELWH
E
(11)
TAVWL
(10) TWLWH
(7) TEHQZ
W
(13) TDVWH
(14) TWHDX
D
(4)
TELQX
(15) TWLQZ
Q
(16) TWHQX
NOTE:
1. In this mode, E rises after W. The address must remain stable whenever both E and W are low.
FIGURE 3. WRITE CYCLE 1: CONTROLLED BY W (LATE WRITE)
(8) TAVAX
A
(18) TAVEL
E
(20) TAVEH
(21) TELEH
(19) TEHAX
(22) TWLEH
W
(23) TDVEH
(24)
TEHDX
(16) TWHQX
D
(4) TELQX
Q
(15) TWLQZ
(7) TEHQZ
NOTE:
1. In this mode, W rises after E. If W falls before E by a time exceeding TWLQZ (Max) TELQX (Min), and rises after E by a time exceeding
TEHQZ (Max) TWHQZ (Min), then Q will remain in the high impedance state throughout the cycle.
FIGURE 4. WRITE CYCLE 2: CONTROLLED BY E (EARLY WRITE)
Low Voltage Data Retention
6
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