CYM1851 CYPRESS [Cypress Semiconductor], CYM1851 Datasheet - Page 3

• Manufacturer Part Number: CYM1851
• Description: 1,024K x 32 Static RAM Module
• Manufacturer: CYPRESS [Cypress Semiconductor]

AC Test Loads and Waveforms
Switching Characteristics
Document #: 38-05274 Rev. **
OUTPUT
READ CYCLE
t
t
t
t
t
t
t
t
t
t
WRITE CYCLE
t
t
t
t
t
t
t
t
t
t
Notes:
Equivalent to:
RC
AA
OHA
ACS
DOE
LZOE
HZOE
LZCS
HZCS
PD
WC
SCS
AW
HA
SA
PWE
SD
HD
LZWE
HZWE
3.
4.
5.
6.
Parameter
INCLUDING
JIG AND
SCOPE
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
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.
OL
HZCS
5V
/I
OUTPUT
OH
and t
30 pF
and 30-pF load capacitance.
HZWE
[6]
(a)
THÉ VENIN
R1 481
are specified with C
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
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
167
R2
255
EQUIVALENT
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.
OUTPUT
[4]
1.73V
INCLUDING
JIG AND
SCOPE
[4, 5]
[5]
5V
Description
HZCS
5 pF
is less than t
(b)
R1 481
LZCS
[3]
for any given device. These parameters are guaranteed and not 100% tested.
R2
255
GND
3.0V
< 5 ns
Min.
12
12
10
3
0
3
9
9
0
1
7
1
3
0
1851-12
Max.
12
12
12
10%
7
7
7
7
90%
ALL INPUT PULSES
Min.
15
15
10
10
12
3
0
3
0
1
8
1
3
0
1851-15
Max.
15
15
15
8
8
8
8
CYM1851
Page 3 of 9
90%
Unit
10%
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
< 5 ns