The AS7C1025 and AS7C31025 are high-performance CMOS 1,048,576-bit Static Random Access Memory (SRAM) devices
organized as 131,072 words × 8 bits. They are 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 12/15/20 ns with output enable access times (t
OE
) of 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 devices enter standby mode. The standard AS7C1025 is guaranteed not to exceed 27.5 mW power
consumption in standby mode, and typically requires only 5 mW Both devices also offer 2.0V data retention.
.
A write cycle is accomplished by asserting write enable (
WE
) and chip enable (
CE
). Data on the input pins I/O0-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
output enable (
OE
) or write enable
(
WE
).
A read cycle is accomplished by asserting output enable (
OE
) and chip enable (
CE
), with write enable (
WE
) high. The chips
drive 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 5V supply (AS7C1025) or 3.3V supply
(AS7C31025). The AS7C1025 and AS7C31025 are 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)
Device
AS7C1025
AS7C31025
Symbol
V
t1
V
t1
V
t2
P
D
T
stg
T
bias
I
OUT
Min
–0.50
–0.50
–0.50
–
–65
–55
–
Max
+7.0
+5.0
V
CC
+ 0.5
1.0
+150
+125
20
Unit
V
V
V
W
o
C
o
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
operation 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
3/23/01; v.1.0
Alliance Semiconductor
P. 2 of 9
®
AS7C1025
AS7C31025
Recommended operating conditions
Parameter
Supply voltage
Device
AS7C1025
AS7C31025
AS7C1025
Input voltage
AS7C31025
commercial
industrial
Symbol
V
CC
V
CC
V
IH
V
IH
V
IL†
Ambient operating temperature
†
V
IL
min = –3.0V for pulse width less than t
RC
/2.
Min
4.5
3.0
2.2
2.0
–0.5
0
–40
Nominal
5.0
3.3
–
–
–
–
–
Max
5.5
3.6
V
CC
+ 0.5
V
CC
+ 0.5
0.8
70
85
Unit
V
V
V
V
V
o
C
o
T
A
T
A
C
DC operating characteristics (over the operating range)
Current measurement is widely used in circuit design, and its main fields are divided into three categories: in measurement, electric meters are used to measure current; in protection, current often h...
From the structure diagram of 430, we can see that the address bus MAB is 16 bits, and the maximum addressing space is 64k. Some chips have internal Flash larger than 64k. How is the range above this ...
[font=微软雅黑]The focus of the "RIGOL Cup Electronic System Design Competition" is to cultivate college students' engineering practice ability, so that students can start from reality and master more kno...
As the title says, you can also add me on msn: hudaweidavid@hotmail.com The driver is a stream driver. I want to write an FM transmission test and a tv_out test...
The error message during programming is:code composer can't locate FLASHAPIInterface.cCould an expert tell me if this is a problem with the programming plugin? Does the API need to be changed?If so, c...
The rapid development of the Internet has realized high-speed information transmission and resource sharing, greatly facilitating people's lives. Embedded systems are widely used in various electr...[Details]
Sailing is gaining more and more attention. How to use modern technology to assist training and improve competition results is particularly important. Considering the real-time data collection in t...[Details]
The Portable Digital Data Acquisition System (PDDAS) uses LabVIEW Real-Time and PXI to control the wind tunnel test and record air pressure data from 128 different channels.
"The LabVIEW Real-...[Details]
introduction
In the discharge process of tokamak plasma physics, the study of rupture and sawtooth is of great significance. Rupture and sawtooth exist in most tokamaks. Rupture is a notew...[Details]
All electronic design engineers and scientists have performed electrical signal analysis, or signal analysis for short. Through this basic measurement, they can gain insight into signal details and...[Details]
introduction
Solar cells and LED lighting are typical applications of new energy and energy-saving and efficient technologies. Solar LED lighting uses solar cells to convert solar energy...[Details]
Power management solutions for today's portable application processors are becoming increasingly integrated. Total power consumption, standby and sleep current consumption affect battery size, bill...[Details]
My colleague and I spent the day chatting in the hotel bar. We had met with several customers. We were both wondering how come these engineers we were meeting knew almost nothing about analog techn...[Details]
5. Identifiers and keywords of C language
A complete PIC microcontroller C language program usually consists of six parts: include files (i.e. header files 1, variable definitions, variable de...[Details]
1. Introduction
At present, most lighting equipment still uses traditional energy for lighting. Making full use of solar energy as the energy supply for lighting equipment is of great si...[Details]
Overview:
This paper introduces a method of connecting a CAN-bus network with Ethernet to form a medium-sized remote monitoring/data transmission network.
CAN (Controller Area Network) is ...[Details]
In the analysis of electronic circuits, static analysis (also known as DC analysis) is the basis of circuit analysis. However, it is well known that electronic components are nonlinear, so the anal...[Details]
RS-422 and RS-485 are both serial data interface standards, which were developed and published by the Electronic Industries Association (EIA). RS-422 defines a balanced communication interface with a ...[Details]
Many battery-powered systems require a visual indicator to show when the battery needs to be replaced. LEDs are commonly used for this purpose, but they consume at least 10mA of current. This con...[Details]
Describe how to meet the challenges of complexity with a modern wiring design toolset. Option codes and expressions can simulate the variables of an automotive project. A full-featured tool suite c...[Details]
Test/Measurement
京公网安备 11010802033920号
EEWORLD
