CY62148-55 CYPRESS [Cypress Semiconductor], CY62148-55 Datasheet - Page 3

• Manufacturer Part Number: CY62148-55
• Description: 512K x 8 Static RAM
• Manufacturer: CYPRESS [Cypress Semiconductor]

AC Test Loads and Waveforms
Switching Characteristics
OUTPUT
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
Shaded areas contain advance information.
Notes
Equivalent to:
RC
AA
OHA
ACE
DOE
LZOE
HZOE
LZCE
HZCE
PU
PD
WC
SCE
AW
HA
SA
PWE
SD
HD
LZWE
HZWE
6.
7.
8.
9.
Parameter
INCLUDING
JIG AND
SCOPE
Test conditions assume signal transition time of 5ns or less, 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
The internal write time of the memory is defined by the overlap of CE LOW, and WE LOW. CE and WE must be LOW to initiate a write, and the transition of any of
these signals can terminate the write. The input data set-up and hold timing should be referenced to the leading edge of the signal that terminates the write.
OL
HZOE
5V
/I
OH
OUTPUT
, t
HZCE
and 100pF load capacitance.
30 pF
, and t
[9]
(a)
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 HIGH to Low Z
WE LOW to High Z
THÉ
HZWE
R1 481
VENIN EQUIVALENT
are specified with a load capacitance of 5 pF as in part (b) of AC Test Loads. Transition is measured 500 mV from steady-state voltage.
167
255
R2
[3,6]
OUTPUT
[8]
[7, 8]
[8]
[7,8]
[7, 8]
Over the Operating Range
1.73V
INCLUDING
JIG AND
SCOPE
5V
PRELIMINARY
Description
HZCE
5 pF
is less than t
(b)
R1 480
LZCE
, t
HZOE
109–3
3
is less than t
255
R2
LZOE
GND
3.0V
, and t
3ns
Min.
HZWE
55
55
45
45
45
45
3
0
3
0
0
0
0
3
62148–55
is less than t
Max.
10%
55
55
20
20
20
55
20
90%
LZWE
ALL INPUT PULSES
for any given device.
Min.
70
70
60
60
50
55
3
0
3
0
0
0
0
3
62148–70
CY62148
Max.
70
70
35
25
25
70
25
90%
10%
109–4
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3 ns