cym1838hg-35mb Cypress Semiconductor Corporation., cym1838hg-35mb Datasheet - Page 3

• Manufacturer Part Number: cym1838hg-35mb
• Description: 128k X 32 Static Ram Module
• Manufacturer: Cypress Semiconductor Corporation.

Switching Characteristics
Switching Waveforms
Read Cycle No. 1
READ CYCLE
t
t
t
t
t
t
t
t
t
WRITE CYCLE
t
t
t
t
t
t
t
t
t
t
RC
AA
OHA
ACS
DOE
LZOE
HZOE
LZCS
HZCS
WC
SCS
AW
HA
SA
PWE
SD
HD
LZWE
HZWE
Notes:
3.
4.
5.
6.
7.
8.
Parameter
DATA OUT
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
At any given temperature and voltage condition, t
tested.
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
Device is continuously selected, CS = V
OL
HZCS
/I
N
OH
is HIGH for read cycle.
and t
and 30-pF load capacitance.
HZWE
[6]
Read Cycle Time
Address to Data Valid
Data Hold from Address Change
CS LOW to Data Valid
OE LOW to Data Valid
OE LOW to Low Z
OE HIGH to High Z
CS LOW to Low Z
CS HIGH to High Z
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
[7,8]
are specified with C
PREVIOUS DATA VALID
Description
Over the Operating Range
L
[4]
= 5 pF as in part (b) of AC Test Loads and Waveforms. Transition is measured 500 mV from steady-state voltage.
[4,5]
[5]
IL
and OE= V
PRELIMINARY
t
OHA
HZCS
IL
is less than t
.
t
AA
LZCS
Min.
1.5
2.0
20
20
15
15
15
10
[3]
3
0
0
2
0
0
for any given device. These parameters are guaranteed by design and not 100%
3
1838-20
t
RC
Max.
20
20
10
10
12
10
Min.
1.5
2.0
25
25
20
20
17
12
3
0
0
2
0
0
1838-25
Max.
25
25
12
10
15
10
DATA VALID
Min.
1.5
2.0
35
35
30
30
25
15
3
0
0
2
0
0
1838-35
Max.
35
35
15
20
20
15
CYM1838
1838–5
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns