cym1821 Cypress Semiconductor Corporation., cym1821 Datasheet - Page 3

• Manufacturer Part Number: cym1821
• Description: 16k X 32 Static Ram Module
• Manufacturer: Cypress Semiconductor Corporation.

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
Notes:
Equivalent to:
RC
AA
OHA
ACS
DOE
LZOE
HZOE
LZCS
HZCS
PU
PD
WC
SCS
AW
HA
SA
PWE
SD
HD
LZWE
HZWE
4.
5.
6.
7.
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
[7]
(a)
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 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
are specified with C
THÉ VENIN EQUIVALENT
481
167
255
Description
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
[5]
[5, 6]
[6]
1.73V
INCLUDING
JIG AND
SCOPE
5V
HZCS
is less than t
5 pF
(b)
481
LZCS
for any given device. These parameters are guaranteed by design and not 100% tested.
Min.
[4]
12
12
10
10
10
10
2
2
3
0
2
0
2
3
0
3
1821-12
1821–3
255
Max.
12
12
10
12
8
8
7
GND
3.0V
< 5 ns
Min.
15
15
12
12
12
10
2
2
3
0
2
0
2
3
0
1821-15
Max.
15
15
10
15
10%
8
8
7
90%
ALL INPUT PULSES
Min.
20
20
15
15
15
10
2
3
5
0
2
2
2
3
0
1821-20
CYM1821
Max.
20
20
10
20
8
8
7
90%
Unit
10%
1821–4
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
< 5 ns