cym1441 Cypress Semiconductor Corporation., cym1441 Datasheet - Page 3

• Manufacturer Part Number: cym1441
• Description: 256k X 8 Static Ram Module
• Manufacturer: Cypress Semiconductor Corporation.

Switching Characteristics
Switching Waveforms
Document #: 38-05271 Rev. **
Read Cycle No. 1
READ CYCLE
t
t
t
t
t
t
t
t
WRITE CYCLE
t
t
t
t
t
t
t
t
t
t
Shaded area contains preliminary information.
Parameter
Notes:
RC
AA
OHA
ACS
LZCS
HZCS
PU
PD
WC
SCS
AW
HA
SA
PWE
SD
HD
LZWE
HZWE
3.
4.
5.
6.
7.
DATAOUT
ADDRESS
Test conditions assume signal transition times 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
t
The internal write time of the memory is defined by the overlap of CS 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.
WE is HIGH for read cycle.
Device is continuously selected, CS = V
OL
HZCS
/I
OH
and t
and 30-pF load capacitance.
HZWE
Read Cycle Time
Address to Data Valid
Data Hold from Address Change
CS LOW to Data Valid
CS LOW to Low Z
CS HIGH to High Z
CS LOW to Power-Up
CS HIGH to Power-Down
Write Cycle Time
CS 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
[5]
are specified with C
[6,7]
PREVIOUS DATA VALID
Description
[4]
[4]
L
Over the Operating Range
= 5 pF as in part (b) of AC Test Loads and Waveforms. Transition is measured 500 mV from steady state voltage.
IL
.
t
OHA
t
AA
Min.
20
20
15
15
15
13
3
3
0
2
0
0
3
0
1441-20
[3]
Max.
20
20
12
20
13
t
RC
Min.
25
25
20
20
20
15
3
3
0
2
0
0
3
0
1441-25
Max.
25
25
15
25
15
Min.
35
35
30
30
25
20
3
3
0
2
0
0
3
0
1441-35
DATA VALID
Max.
35
35
25
35
20
Min.
45
45
35
35
30
20
3
3
0
2
2
0
3
0
1441-45
Max.
CYM1441
45
45
30
45
25
Page 3 of 6
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns