The AS7C31025B is a high-performance CMOS 1,048,576-bit Static Random Access Memory (SRAM) device organized as 131,072 x 8 bits. It
is designed for memory applications where fast data access, low power, and simple interfacing are desired.
Equal address access and cycle times (t
AA
, t
RC
, t
WC
) of 8/10/12/15/20 ns with output enable access times (t
OE
) of 5, 5, 6, 7, 8 ns are ideal for
high-performance applications. The chip enable input CE permits easy memory and expansion with multiple-bank memory systems.
When CE is high the device enters standby mode. A write cycle is accomplished by asserting write enable (WE) and chip enable (CE). Data on
the input pins I/O0 through I/O7 is written on the rising edge of WE (write cycle 1) or CE (write cycle 2). To avoid bus contention, external
devices should drive I/O pins only after outputs have been disabled with
RXWSXW HQDEOH
OE
RU ZULWH HQDEOH
(WE).
A read cycle is accomplished by asserting output enable (OE) and chip enable (CE), with write enable (WE) high. The chip drives I/O pins
with the data word referenced by the input address. When either chip enable or output enable is inactive or write enable is active, output
drivers stay in high-impedance mode.
All chip inputs and outputs are TTL-compatible, and operation is from a single 3.3 V supply. The AS7C31025B is packaged in common industry
standard packages.
Absolute maximum ratings
Parameter
Voltage on V
CC
relative to GND
Voltage on any pin relative to GND
Power dissipation
Storage temperature (plastic)
Ambient temperature with V
CC
applied
DC current into outputs (low)
Symbol
V
t1
V
t2
P
D
T
stg
T
bias
I
OUT
Min
–0.50
–0.50
–
–65
–55
–
Max
+5.0
V
CC
+ 0.5
1.0
+150
+125
20
Unit
V
V
W
o
o
C
C
mA
NOTE: Stresses greater than those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress rating only and functional oper-
ation of the device at these or any other conditions outside those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
Truth table
CE
H
L
L
L
WE
X
H
H
L
OE
X
H
L
X
Data
High Z
High Z
D
OUT
D
IN
Mode
Standby (I
SB
, I
SB1
)
Output disable (I
CC
)
Read (I
CC
)
Write (I
CC
)
Key: X = don’t care, L = low, H = high.
3/31/03, v. 042003
Alliance Semiconductor
P. 2 of 8
AS7C31025B
®
Recommended operating conditions
Parameter
Supply voltage
Input voltage
Ambient operating temperature
†
V
IL
min. = –3.0 V for pulse width less than t
RC
/2.
Symbol
V
CC
V
IH
V
IL†
T
A
T
A
Min
3.0
2.0
–0.5
0
–40
Nominal
3.3
–
–
–
–
Max
3.6
V
CC
+ 0.5
0.8
70
85
Unit
V
V
V
o
C
o
C
DC operating characteristics (over the operating range)
-8
Parameter
Input leakage
current
Output leakage
current
Operating power
supply current
-10
-12
-15
-20
Sym
|
I
LI
|
|
I
LO
|
I
CC
I
SB
Test conditions
V
CC
= Max, V
IN
= GND to V
CC
V
CC
= Max, CE = V
IH
,
V
out
= GND to V
CC
CE = V
IL
,
f
=
f
Max
,
I
OUT
= 0 mA
CE = V
IH
, f = f
Max
, f
OUT
= 0
CE
≥
V
CC
–0.2 V,
V
IN
≤
0.2 V or V
IN
≥
V
CC
–0.2 V,
f = 0, f
OUT
= 0
I
OL
= 8 mA, V
CC
= Min
I
OH
= –4 mA, V
CC
= Min
Min Max Min Max Min Max Min Max Min Max Unit
–
–
–
–
–
–
2.4
1
1
75
30
–
–
–
–
–
–
2.4
1
1
70
30
–
–
–
–
–
–
2.4
1
1
65
25
–
–
–
–
–
–
2.4
1
1
60
20
–
–
–
–
–
–
2.4
1
1
55
20
µA
µA
mA
mA
mA
V
V
Standby power
supply current
I
SB1
V
OL
V
OH
5
0.4
–
5
0.4
–
5
0.4
–
5
0.4
–
5
0.4
–
Output voltage
Capacitance (
f = 1 MHz, T
a
= 25
o
C, V
CC
= NOMINAL
)
Parameter
Input capacitance
I/O capacitance
Symbol
C
IN
C
I/O
Signals
A, CE, WE, OE
I/O
Test conditions
V
IN
= 0 V
V
IN
= V
OUT
= 0 V
Max
5
7
Unit
pF
pF
3/31/03, v. 042003
Alliance Semiconductor
P. 3 of 8
AS7C31025B
®
Read cycle (over the operating range)
-8
Parameter
Read cycle time
Address access time
Chip enable (CE) access time
Output enable (OE) access time
Output hold from address change
CE
ORZ W
o output in low Z
CE high to output in high Z
OE low to output in low Z
OE high to output in high Z
Power up time
Power down time
t
RC
t
AA
t
ACE
t
OE
t
OH
t
CLZ
t
CHZ
t
OLZ
t
OHZ
t
PU
t
PD
8
–
–
–
3
3
–
0
–
0
–
–
8
8
5
–
–
3
–
4
–
8
-10
10
–
–
–
3
3
–
0
–
0
–
–
10
10
5
–
–
3
–
5
–
10
-12
12
–
–
–
3
3
–
0
–
0
–
–
12
12
6
–
–
3
–
6
–
12
-15
15
–
–
–
3
3
–
0
–
0
–
–
15
15
7
–
–
4
–
7
–
15
-20
20
–
–
–
3
3
–
0
–
0
–
–
20
20
8
–
–
5
–
8
–
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5
4, 5
4, 5
4, 5
4, 5
4, 5
4, 5
3
3
Symbol Min Max Min Max Min Max Min Max Min Max Unit Notes
}I use ListView to display the information in the XML file, but I find that the columns in ListView are not displayed at all, no matter I add columns in the designer or add them with code, the result ...
When using USB to transfer data under wince, calling GetTransferStatus shows the error value USB_DATA_OVERRUN_ERROR. What caused this error? Thank you...
Today I was looking at the Linux kernel semaphore, and there was a question I didn't understand. Please help! The code of the up() function that releases the semaphore in the book is: movl $sem->count...
[size=4] Because the G2 series has fewer IO ports, the LCD display has always been serial. In the end, only 3 ports were connected. PSB was directly connected to ground. RST was not connected, but it ...
[align=left][color=rgb(51, 51, 51)][font="]Today, the editor has summarized the basic common sense of module power supply. Please listen carefully! [/font][/color][/align][align=left][color=rgb(51, 51...
In the war without gunpowder between China and the United States,
ZTE
has become a new victim. The seven-year chip ban by the United States has pushed this communications giant to a life-or...[Details]
1. Purpose In actual product release, if the program stored in the MCU Flash is not protected, some illegal companies may read the program in the Flash through an emulator (J-Link, ST-Link, e...[Details]
In the actual project development process, hardware circuits often need to be modified, and the modified parts need to modify the driver. Thinking about the coming and going of such requirements is t...[Details]
The program got stuck during LCD initialization. Through hardware debugging, it was found that it was stuck in the Delay_ms() function. Going to the definition, it was found to be a macro definition ...[Details]
Chip: STM32F103C8T6 Application Pin: Output: PA0, PA1 TIM2 CH2 channel To achieve 50HZ (20ms) adjustable PWM output on the PA1 pin, set the system TIMx_CNT=8MHZ=8000 000HZ, set TIMx_PSC=800-1, then T...[Details]
Our photovoltaic power station starts working at 5:30 in the morning. When you are still sleeping, the inverter starts working to make money!
Some people are skeptical. The sun hasn't even...[Details]
China Energy Storage Network News:
The State Grid Corporation of China, this elephant, is planning to turn around and enter the emerging power service market.
The rallying cry for the tr...[Details]
When designing a product, if the application environment's requirements for power isolation are not considered, the product will be unstable due to improper design, and even high voltage may damage t...[Details]
Nowadays, everyone is saying that "technology is people-oriented". The essence of the development of technology is to serve the improvement of the quality of life of human beings. Automated driving...[Details]
From concept proposal, prototype exploration, technology accumulation to product iteration and industrial development,
VR
has gradually expanded from the military market to the consumer market...[Details]
1 Introduction Due to the special working environment of coal mine production, the production process is more dangerous and unsafe than the general industry. With the continuous increase in c...[Details]
With the development of information technology, intelligence, informatization and networking have become the development trend of modern industrial control. Since the 1980s, the rapid development...[Details]
Every era has anxiety that has nowhere to go. Let's follow the embedded editor to learn about the relevant content.
The anxiety of the post-Internet era is that if you don’t revolutionize ...[Details]
From the functional classification, it can be divided into: 1. Active control ADAS: ACC/AEB/LKS, etc. 2. Warning ADAS: FCW/LDW/PCW, etc. 3. Other auxiliary ADAS: BSD/ADB/panora...[Details]
Similar to the development trend of photovoltaic modules, photovoltaic inverters are also one of the examples of China's successful localization of manufacturing and leading the global market and tech...[Details]
Analogue and Mixed Signal
京公网安备 11010802033920号
EEWORLD
