CY62256 Cypress Semiconductor, CY62256 Datasheet - Page 4

• Manufacturer Part Number: CY62256
• Description: 256K (32K x 8) Static RAM
• Manufacturer: Cypress Semiconductor

Document #: 38-05248 Rev. *B
Switching Characteristics
Switching Waveforms
Read Cycle
t
t
t
t
t
t
t
t
t
t
t
Write Cycle
t
t
t
t
t
t
t
t
t
t
Notes:
RC
AA
OHA
ACE
DOE
LZOE
HZOE
LZCE
HZCE
PU
PD
WC
SCE
AW
HA
SA
PWE
SD
HD
HZWE
LZWE
10. The minimum Write cycle time for Write cycle #3 (WE controlled, OE LOW) is the sum of t
11. Device is continuously selected. OE, CE = V
12. WE is HIGH for Read cycle.
6.
7.
8.
9.
Read Cycle No. 1
DATA OUT
ADDRESS
Parameter
Test conditions assume signal transition time of 5 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
I
At any given temperature and voltage condition, t
t
The internal Write time of the memory is defined by the overlap of CE LOW and WE LOW. Both signals must be LOW to initiate a Write and either signal can terminate
a Write by going HIGH. The data input set-up and hold timing should be referenced to the rising edge of the signal that terminates the Write.
OL
HZOE
/I
OH
, t
HZCE
and 100-pF load capacitance.
[9, 10]
, and t
HZWE
[11, 12]
Read Cycle Time
Address to Data Valid
Data Hold from Address Change
CE LOW to Data Valid
OE LOW to Data Valid
OE LOW to Low-Z
OE HIGH to High-Z
CE LOW to Low-Z
CE HIGH to High-Z
CE LOW to Power-up
CE HIGH to Power-down
Write Cycle Time
CE LOW to Write End
Address Set-up to Write End
Address Hold from Write End
Address Set-up to Write Start
WE Pulse Width
Data Set-up to Write End
Data Hold from Write End
WE LOW to High-Z
WE HIGH to Low-Z
are specified with C
PREVIOUS DATA VALID
Over the Operating Range
L
= 5 pF as in (b) of AC Test Loads. Transition is measured 500 mV from steady-state voltage.
IL
[7]
[7]
.
Description
[7, 8]
[7, 8]
[7]
[7, 8]
t
OHA
HZCE
is less than t
t
AA
LZCE
[6]
, t
HZOE
is less than t
t
RC
HZWE
LZOE
Min.
and t
55
55
45
40
25
45
CY62256 55
, and t
5
5
5
0
0
0
0
5
SD
HZWE
is less than t
Max.
55
55
25
20
20
55
20
DATA VALID
LZWE
Min.
70
70
60
60
50
30
CY62256 70
for any given device.
5
5
5
0
0
0
0
5
Max.
70
70
35
25
25
70
25
CY62256
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Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns