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PDF CY7C148 Data sheet ( Hoja de datos )
| Número de pieza | CY7C148 | |
| Descripción | (CY7C148 / CY7C149) 1K x 4 Static RAM | |
| Fabricantes | Cypress Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CY7C148 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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CY7C148
CY7C149
1Kx4 Static RAM
Features
• Automatic power-down when deselected (7C148)
• CMOS for optimum speed/power
• 25-ns access time
• Low active power
— 440 mW (commercial)
— 605 mW (military)
• Low standby power (7C148)
— 82.5 mW (25-ns version)
— 55 mW (all others)
• 5-volt power supply ± 10% tolerance, both commercial
and military
• TTL-compatible inputs and outputs
Functional Description
sion is provided by an active LOW chip select (CS) input and
three-state outputs. The CY7C148 remains in a low-power
mode as long as the device remains unselected; i.e., (CS) is
HIGH, thus reducing the average power requirements of the
device. The chip select (CS) of the CY7C149 does not affect
the power dissipation of the device.
Writing to the device is accomplished when the chip select
(CS) and write enable (WE) inputs are both LOW. Data on the
I/O pins (I/O0 through I/O3) is written into the memory loca-
tions specified on the address pins (A0 through A9).
Reading the device is accomplished by taking chip select (CS)
LOW while write enable (WE) remains HIGH. Under these
conditions, the contents of the location specified on the
address pins will appear on the four data I/O pins.
The I/O pins remain in a high-impedance state when chip se-
lect (CS) is HIGH or write enable (WE) is LOW.
The CY7C148 and CY7C149 are high-performance CMOS
static RAMs organized as 1024 by 4 bits. Easy memory expan-
Logic Block Diagram
INPUTBUFFER
A9
A8
A7 64 x 64
A6 ARRAY
A5
A4
COLUMN
DECODER
POWER
DOWN
(7C148)
A3 A2 A1 A0
Pin Configurations
DIP
Top View
I/O0
I/O1
I/O2
I/O3
CS
WE
C148–1
A6
A5
A4
A3
A0
A1
A2
CS
GND
1
2
3
4
5
6
7
8
9
18 VCC
17 A7
16 A8
15 A9
14 I/O 0
13 I/O 1
12 I/O 2
11 I/O 3
10 WE
C148–2
LCC
Top View
2 1 1817
A4 3
16 A8
A13 4
15 A9
A10 5
A11 6
A12 7
14 I/O 0
13 I/O1
12 I/O2
8 91011
C148–3
Selection Guide
Maximum Access Time (ns)
Maximum Operating
Current (mA)
Commercial
Military
Maximum Standby
Current (mA)
Commercial
Military
Maximum Ratings
7C148−25
25
90
15
7C148−35
35
80
110
10
10
7C148−45
45
80
110
10
10
7C149−25
25
90
7C149−35
35
80
110
7C149−45
45
80
110
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
November 1989 - Revised November 1993
1 page  
CY7C148
CY7C149
Switching Waveforms (continued)
Write Cycle No. 2 (CSControlled) [13]
ADDRESS
CS
WE
tWC
tCW
tAW
tWP
tWR
DATA IN
DATA OUT
DATA UNDEFINED
tDW
DATAIN VALID
tWZ
tDH
HIGH IMPEDANCE
Notes:
13. If CS goes HIGH simultaneously with WE HIGH, the output remains in a high-impedance state.
C148–9
Typical DC and AC Characteristics
NORMALIZED SUPPLY CURRENT
vs.SUPPLY VOLTAGE
1.4
1.2
1.0 ICC
0.8 VIN =5.0V
0.6 TA =25°C
0.4
0.2
0.0
4.0
ISB
4.5 5.0 5.5
SUPPLY VOLTAGE(V)
6.0
NORMALIZED SUPPLY CURRENT
vs.AMBIENT TEMPERATURE
1.2
1.0 ICC
0.8
0.6
0.4
0.2
0.0
−55
VCC =5.0V
VIN =5.0V
ISB
25 125
AMBIENT TEMPERATURE(°C)
OUTPUT SOURCE CURRENT
vs.OUTPUT VOLTAGE
120
100
80
60
VCC =5.0V
TA =25°C
40
20
0
0.0 1.0 2.0 3.0 4.0
OUTPUT VOLTAGE(V)
NORMALIZED ACCESS TIME
vs.SUPPLY VOLTAGE
1.4
1.3
1.2
1.1
TA =25°C
1.0
0.9
0.8
4.0
4.5 5.0 5.5 6.0
SUPPLY VOLTAGE(V)
NORMALIZED ACCESS TIME
vs.AMBIENT TEMPERATURE
1.6
1.4
1.2
1.0
VCC =5.0V
0.8
0.6
−55
25
125
AMBIENT TEMPERATURE(°C)
OUTPUT SINK CURRENT
vs.OUTPUT VOLTAGE
140
120
100
80
60 VCC =5.0V
40 TA =25°C
20
0
0.0
1.0 2.0 3.0
OUTPUT VOLTAGE(V)
4.0
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CY7C148.PDF ] | |
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