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CY7C149-25PC 데이터 시트보기 (PDF) - Cypress Semiconductor
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CY7C149-25PC
1Kx4 Static RAM
Cypress Semiconductor
CY7C149-25PC Datasheet PDF : 9 Pages
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CY7C148
CY7C149
Switching Waveforms
Read Cycle No. 1
[10,11]
t
RC
ADDRESS
DATA OUT
t
AA
t
OH
PREVIOUS DATA VALID
Read Cycle No. 2
[10,12]
t
RC
CS
t
ACS
DATA VALID
C148
–
6
DATA OUT
V
CC
SUPPLY
CURRENT
t
LZ
HIGH IMPEDANCE
t
PU
50%
Write Cycle No.1 (WE Controlled)
ADDRESS
CS
t
AS
WE
DATA IN
t
WC
t
CW
t
AW
DATA OUT
DATA UNDEFINED
Notes:
10. WE is HIGH for read cycle.
11. Device is continuously selected, CS = V
IL
.
12. Address valid prior to or coincident with CS transition LOW.
DATA VALID
t
HZ
HIGH
IMPEDANCE
t
PD
50%
ICC
ISB
C148
–
7
t
WA
t
WP
t
DW
t
DH
DATA
–
IN VALID
t
WZ
t
OW
HIGH IMPEDANCE
C148
–
8
Document #: 38-05059 Rev. **
Page 4 of 9
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