U631H256XS 데이터 시트보기 (PDF) - Simtek Corporation
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U631H256XS Datasheet PDF : 15 Pages
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Read Cycle 1: Ai-controlled (during Read cycle: E = G = VIL, W = VIH)f
U631H256XS
Ai
DQi
Output
Previous Data Valid
tv(A) (9)
tcR (1)
Address Valid
ta(A) (2)
Output Data Valid
Read Cycle 2: G-, E-controlled (during Read cycle: W = VIH)g
Ai
E
G
DQi
Output
ICC
High Impedance
ACTIVE
STANDBY
tcR
(1)
Address Valid
ta(A) (2)
ta(E) (3)
ten(E) (7)
ten(G) (8)
ta(G) (4)
tPU (10)
tdis(E) (5)
tPD (11)
tdis(G) (6)
Output Data Valid
No.
Switching Characteristics
Write Cycle
Symbol
25
35
45
Unit
Alt. #1 Alt. #2 IEC Min. Max. Min. Max. Min. Max.
12 Write Cycle Time
tAVAV
tAVAV
tcW 25#
35#
45#
ns
13 Write Pulse Width
tWLWH
tw(W) 20#
25#
30#
ns
14 Write Pulse Width Setup Time
tWLEH tsu(W) 20#
25#
30#
ns
15 Address Setup Time
tAVWL
tAVEL
tsu(A)
0#
0#
0#
ns
16 Address Valid to End of Write
tAVWH
tAVEH tsu(A-WH) 20#
25#
30#
ns
17 Chip Enable Setup Time
tELWH
tsu(E) 20#
25#
30#
ns
18 Chip Enable to End of Write
tELEH
tw(E) 20#
25#
30#
ns
19 Data Setup Time to End of Write tDVWH tDVEH tsu(D) 10#
12#
15#
ns
20 Data Hold Time after End of
tWHDX
tEHDX
th(D)
0#
0#
0#
ns
Write
21 Address Hold after End of Write tWHAX tEHAX
th(A)
0#
0#
0#
ns
22 W LOW to Output in High-Zh, i
tWLQZ
tdis(W)
10#
13#
15# ns
23 W HIGH to Output in Low-Z
tWHQX
ten(W) 5#
5#
5#
ns
March 31, 2006
STK Control #ML0044
5
Rev 1.0
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