參數(shù)資料
型號(hào)： CYM1841A
廠商： Cypress Semiconductor Corp.
英文描述： 256K x 32 Static RAM Module(256K x 32 靜態(tài)RAM模塊)
中文描述： 256K × 32靜態(tài)RAM模塊（256K × 32靜態(tài)內(nèi)存模塊）
文件頁(yè)數(shù)： 3/11頁(yè)
文件大?。?/td> 274K
代理商： CYM1841A
CYM1841A
CYM1841C
3
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature
.....................................–
55
°
C to +125
°
C
Ambient Temperature with
Power Applied
.................................................... –
10
°
C to +85
°
C
Supply Voltage to Ground Potential
..................–
0.5V to +7.0V
DC Voltage Applied to Outputs
in High Z State
..................................................... –
0.5V to +7.0V
DC Input Voltage
................................................. –
0.5V to +7.0V
Operating Range
Range
Ambient
Temperature
0
°
C to +70
°
C
V
CC
Commercial
5V
±
10%
Electrical Characteristics
Over the Operating Range
Parameter
Description
Test Conditions
1841C
-
12
1841C
-
15
Min.
1841A-20
1841C-20
Min.
1841A-25, 35, 45
1841C-25, 35, 45
Min.
Max.
Max.
Max.
Unit
V
OH
V
OL
V
IH
V
IL
I
IX
I
OZ
Output HIGH Voltage
V
CC
= Min., I
OH
= –4.0 mA
V
CC
= Min., I
OL
= 8.0 mA
2.4
2.4
2.4
V
Output LOW Voltage
0.4
0.4
0.4
V
Input HIGH Voltage
2.2
V
CC
0.8
2.2
V
CC
0.8
2.2
V
CC
0.8
V
Input LOW Voltage
–0.5
–0.5
–0.5
V
μ
A
μ
A
Input Leakage Current
GND < V
I
< V
CC
GND < V
O
< V
CC
,
Output Disabled
–16
+16
–16
+16
–16
+16
Output Leakage
Current
–10
+10
–10
+10
–10
+10
I
CC
V
CC
Operating
Supply Current
V
CC
= Max., I
OUT
= 0 mA,
CS < V
IL
Max. V
CC
, CS > V
IH
,
Min. Duty Cycle = 100%
1600
1120
960
mA
I
SB1
Automatic CS Power-
Down Current
[1]
480
480
480
mA
I
SB2
Automatic CS Power-
Down Current
[1]
Max. V
CC
, CS > V
CC
- 0.2V,
V
IN
> V
CC
– 0.2V,
or V
IN
< 0.2V
240
120
120
mA
Capacitance
[2]
Parameter
C
IN
C
OUT
Notes:
1.
A pull-up resistor to V
on the CS input is required to keep the device deselected during V
CC
power-up, otherwise I
SB
will exceed values given.
2.
Tested on a sample basis.
3.
20 pF on CS, 70 pF all others.
Description
Test Conditions
T
A
= 25
°
C, f = 1 MHz,
V
CC
= 5.0V
Max.
70/20
Unit
pF
Input Capacitance
[3]
Output Capacitance
20
pF
AC Test Loads and Waveforms
1841A–4
1841A–5
90%
10%
3.0V
GND
90%
10%
ALL INPUT PULSES
5V
OUTPUT
30 pF
INCLUDING
JIG AND
SCOPE
5V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
(a)
(b)
< 5 ns
< 5 ns
OUTPUT
R1481
R1481
R2
255
R2
255
167
Equivalent to:
THé VENIN EQUIVALENT
1.73V
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