CY7C195 CYPRESS [Cypress Semiconductor], CY7C195 Datasheet - Page 4

• Manufacturer Part Number: CY7C195
• Description: 64K x 4 Static RAM
• Manufacturer: CYPRESS [Cypress Semiconductor]

:
Switching Characteristics
Document #: 38-05162 Rev. **
Parameter
READ CYCLE
t
t
t
t
t
t
t
t
t
t
t
t
t
t
WRITE CYCLE
t
t
t
t
t
t
t
t
t
t
Notes:
10. The internal write time of the memory is defined by the overlap of CE
RC
AA
OHA
ACE1
ACE2
DOE
LZOE
HZOE
LZCE1
LZCE2
HZCE1
HZCE2
PU
PD
WC
SCE
AW
HA
SA
PWE
SD
HD
LZWE
HZWE
7.
8.
9.
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
t
At any given temperature and voltage condition, t
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.
HZOE
,
,
,
, t
HZCE
Read Cycle Time
Address to Data
Valid
Output 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 HIGH to
Low Z
WE LOW to
High Z
, and t
[10]
Description
HZWE
[8]
[8]
[8]
[8,8]
[8, 9]
are specified with C
7C195,
7C196
7C195,
7C196
7C195,
7C196
Over the Operating Range
L
Min.
12
12
= 5 pF as in part (b) of AC Test Loads. Transition is measured 500 mV from steady-state voltage.
7C194-12
7C195-12
7C196-12
3
0
3
0
9
9
0
0
8
8
0
3
HZCE
Max.
12
12
12
5
5
5
7
is less than t
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Unit
7C194-15
7C195-15
7C196-15
15
15
10
10
3
0
3
0
0
0
9
9
0
3
LZCE
OL
1
/I
[7]
LOW, CE
OH
15
15
15
and t
7
7
7
7
and 30-pF load capacitance.
HZWE
2
7C194-20
7C195-20
7C196-20
20
20
15
15
15
10
LOW, and WE LOW. All signals must be LOW to initiate a write and any signal can
3
0
3
0
0
0
0
3
is less than t
20
20
20
10
9
9
9
LZWE
7C194-25
7C195-25
7C196-25
25
25
18
20
18
10
for any given device.
3
3
3
0
0
0
0
3
0
25
25
10
25
13
11
11
7C194-35
7C195-35
7C196-35
35
35
22
25
22
15
3
3
3
0
0
0
0
3
0
35
35
16
15
15
35
15
7C194-45
7C196-45
45
45
22
35
22
15
3
3
3
0
0
0
0
3
0
CY7C194
CY7C195
CY7C196
Page 4 of 12
45
45
16
15
15
45
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns