Cypress Semiconductor CY7C199 Технический паспорт - Страница 5
Просмотреть онлайн или скачать pdf Технический паспорт для Компьютерное оборудование Cypress Semiconductor CY7C199. Cypress Semiconductor CY7C199 17 страниц. 32k x 8 static ram
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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
[10, 11]
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
Shaded area contains advance information.
Notes:
7.
Test conditions assume signal transition time of 3 ns or less for -12 and -15 speeds and 5 ns or less for -20 and slower speeds, timing reference levels of 1.5V,
input pulse levels of 0 to 3.0V, and output loading of the specified I
8.
At any given temperature and voltage condition, t
9.
t
, t
, and t
are specified with C
HZOE
HZCE
HZWE
10. 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.
11. The minimum write cycle time for write cycle #3 (WE controlled, OE LOW) is the sum of t
Document #: 38-05160 Rev. **
Over the Operating Range
Description
Min.
[8]
[8, 9]
[8]
[8,9]
[9]
[8]
is less than t
HZCE
= 5 pF as in part (b) of AC Test Loads. Transition is measured 500 mV from steady-state voltage.
L
[3, 7]
7C199-8
7C199-10
Max.
Min.
Max.
8
10
8
10
3
3
8
10
4.5
5
0
0
5
5
3
3
4
5
0
0
8
10
8
10
7
7
7
7
0
0
0
0
7
7
5
5
0
0
5
6
3
3
/I
and 30-pF load capacitance.
OL
OH
, t
is less than t
, and t
LZCE
HZOE
LZOE
HZWE
and t
.
HZWE
SD
7C199-12
7C199-15
Min.
Max.
Min.
12
15
12
3
3
12
5
0
0
5
3
3
5
0
0
12
12
15
9
10
9
10
0
0
0
0
8
9
8
9
0
0
7
3
3
is less than t
for any given device.
LZWE
CY7C199
Max.
Unit
ns
15
ns
ns
15
ns
7
ns
ns
7
ns
ns
7
ns
ns
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
7
ns
ns
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