WCFS4008V1C Datasheet, PDF (6/9 Pages) Weida Semiconductor, Inc. – 512K x 8 Static RAM

Switching Waveforms (continued)
Write Cycle No. 1(WE Controlled, OE HIGH During Write)^{[12, 13]}
t_WC
ADDRESS
t_SCE
CE
t_AW
t_SA
t_PWE
WE
OE
DATA I/O
NOTE 14
t_HZOE
Write Cycle No. 2 (WE Controlled, OE LOW)^[13]
ADDRESS
CE
t_SD
DATA_IN VALID
t_WC
t_SCE
WCFS4008V1C
t_HA
t_HD
t_SA
WE
DATA I/O
NOTE 14
t_HZWE
t_AW
t_PWE
t_SD
DATA VALID
t_HA
t_HD
t_LZWE
Truth Table
CE
OE WE
I/O₀ – I/O₇
H
X
X High Z
Power-Down
Mode
L
L
H Data Out
Read
L
X
L Data In
Write
L
H
H High Z
Selected, Outputs Disabled
Notes:
12. Data I/O is high-impedance if OE = V_IH.
13. If CE goes HIGH simultaneously with WE going HIGH, the output remains in a high-impedance state.
14. During this period the I/Os are in the output state and input signals should not be applied.
Power
Standby (I_SB)
Active (I_CC)
Active (I_CC)
Active (I_CC)
6