Cypress Semiconductor CY62157ESL Arkusz specyfikacji - Strona 6

Przeglądaj online lub pobierz pdf Arkusz specyfikacji dla Sprzęt komputerowy Cypress Semiconductor CY62157ESL. Cypress Semiconductor CY62157ESL 13 stron. Mobl 8-mbit (512k x 16) static ram

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Switching Characteristics

[9]
Over the Operating Range
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
t
BLE/BHE LOW to Data Valid
DBE
t
BLE/BHE LOW to Low-Z
LZBE
t
BLE/BHE HIGH to HIGH-Z
HZBE
[13]
Write Cycle
t
Write Cycle Time
WC
t
CE LOW to Write End
SCE
t
Address Setup to Write End
AW
t
Address Hold from Write End
HA
t
Address Setup to Write Start
SA
t
WE Pulse Width
PWE
t
BLE/BHE LOW to Write End
BW
t
Data Setup 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
Notes
9. Test conditions for all parameters other than tri-state parameters assume signal transition time of 3 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to
3V, and output loading of the specified I
10. At any temperature and voltage condition, t
11. t
, t
, t
, and t
transitions are measured when the outputs enter a high-impedance state.
HZOE
HZCE
HZBE
HZWE
12. If both byte enables are toggled together, this value is 10 ns.
13. The internal write time of the memory is defined by the overlap of WE, CE = V
signals can terminate a write by going inactive. The data input setup and hold timing must be referenced to the edge of the signal that terminates the write.
Document #: 001-43141 Rev. **
Description
[10]
[10, 11]
[10]
[10, 11]
[10, 12]
[10, 11]
[10, 11]
[10]
/I
as shown in the
AC Test Loads and Waveforms on page
OL
OH
is less than t
, t
is less than t
HZCE
LZCE
HZBE
Min
45
10
5
10
0
5
45
35
35
0
0
35
35
25
0
10
4.
, t
is less than t
LZBE
HZOE
LZOE
, BHE, BLE or both = V
. All signals must be active to initiate a write and any of these
IL
IL
CY62157ESL MoBL
45 ns
Unit
Max
ns
45
ns
ns
45
ns
22
ns
ns
18
ns
ns
18
ns
ns
45
ns
45
ns
ns
18
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
18
ns
ns
, and t
is less than t
for any device.
HZWE
LZWE
Page 6 of 12
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