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コンピュータ・ハードウェア Cypress 256K (32K x 8) CY62256のPDF 仕様書をオンラインで閲覧またはダウンロードできます。Cypress 256K (32K x 8) CY62256 11 ページ。 256k (32k x 8) static ram

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Cypress 256K (32K x 8) CY62256 仕様書

Switching Characteristics

Parameter
Read Cycle
t
Read Cycle Time
RC
t
Address to Data Valid
AA
t
Data Hold from Address Change
OHA
t
CE LOW to Data Valid
ACE
t
OE LOW to Data Valid
DOE
t
OE LOW to Low-Z
LZOE
t
OE HIGH to High-Z
HZOE
t
CE LOW to Low-Z
LZCE
t
CE HIGH to High-Z
HZCE
t
CE LOW to Power-up
PU
t
CE HIGH to Power-down
PD
[9, 10]
Write Cycle
t
Write Cycle Time
WC
t
CE LOW to Write End
SCE
t
Address Set-up to Write End
AW
t
Address Hold from Write End
HA
t
Address Set-up to Write Start
SA
t
WE Pulse Width
PWE
t
Data Set-up to Write End
SD
t
Data Hold from Write End
HD
t
WE LOW to High-Z
HZWE
t
WE HIGH to Low-Z
LZWE

Switching Waveforms

[11, 12]
Read Cycle No. 1
ADDRESS
DATA OUT
PREVIOUS DATA VALID
Notes:
6.
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
/I
and 100-pF load capacitance.
OL
OH
7.
At any given temperature and voltage condition, t
8.
t
, t
, and t
are specified with C
HZOE
HZCE
HZWE
9.
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.
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.
Document #: 38-05248 Rev. *B
[6]
Over the Operating Range
Description
[7]
[7, 8]
[7]
[7, 8]
[7, 8]
[7]
t
AA
t
OHA
is less than t
, t
HZCE
LZCE
= 5 pF as in (b) of AC Test Loads. Transition is measured 500 mV from steady-state voltage.
L
.
IL
CY62256 55
Min.
Max.
55
5
5
5
0
55
45
45
0
0
40
25
0
5
t
RC
is less than t
, and t
is less than t
HZOE
LZOE
HZWE
and t
HZWE
SD
CY62256
CY62256 70
Min.
Max.
70
55
70
5
55
70
25
35
5
20
25
5
20
25
0
55
70
70
60
60
0
0
50
30
0
20
25
5
DATA VALID
for any given device.
LZWE
Page 4 of 11
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns