CY62256VN
256-Kbit (32 K × 8) Static RAM
256-Kbit (32 K × 8) Static RAM
Features
■
Functional Description
The CY62256VN family is composed of two high performance
CMOS static RAM’s organized as 32K words by 8 bits. Easy
memory expansion is provided by an active LOW chip enable
(CE) and active LOW output enable (OE) and tristate drivers.
These devices have an automatic power-down feature, reducing
the power consumption by over 99% when deselected.
An active LOW write enable signal (WE) controls the
writing/reading operation of the memory. When CE and WE
inputs are both LOW, data on the eight data input/output pins
(I/O
0
through I/O
7
) is written into the memory location addressed
by the address present on the address pins (A
0
through A
14
).
Reading the device is accomplished by selecting the device and
enabling the outputs, CE and OE active LOW, while WE remains
inactive or HIGH. Under these conditions, the contents of the
location addressed by the information on address pins are
present on the eight data input/output pins.
The input/output pins remain in a high impedance state unless
the chip is selected, outputs are enabled, and write enable (WE)
is HIGH.
For a complete list of related documentation, click
here.
Temperature ranges
❐
Commercial: 0 °C to +70 °C
❐
Industrial: –40 °C to +85 °C
❐
Automotive-A: –40 °C to +85 °C
❐
Automotive-E: –40 °C to +125 °C
Speed: 70 ns
Low voltage range: 2.7 V to 3.6 V
Low active power and standby power
Easy memory expansion with CE and OE features
TTL compatible inputs and outputs
Automatic power-down when deselected
CMOS for optimum speed and power
Available in standard Pb-free and non Pb-free 28-pin (300-mil)
narrow SOIC, 28-pin TSOP-I, and 28-pin reverse TSOP-I
packages
■
■
■
■
■
■
■
■
Logic Block Diagram
INPUTBUFFER
A
10
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
CE
WE
OE
A
14
A
13
A
12
A
11
A
1
A
0
ROW DECODER
I/O
0
I/O
1
SENSE AMPS
I/O
2
I/O
3
I/O
4
I/O
5
32K x 8
Y
ARRA
COLUMN
DECODER
POWER
DOWN
I/O
6
I/O
7
Cypress Semiconductor Corporation
Document Number: 001-06512 Rev. *H
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised January 16, 2015
CY62256VN
Contents
Product Portfolio .............................................................. 3
Pin Configurations ........................................................... 3
Pin Definitions .................................................................. 3
Maximum Ratings ............................................................. 4
Operating Range ............................................................... 4
Electrical Characteristics ................................................. 4
Capacitance ...................................................................... 5
Thermal Resistance .......................................................... 5
AC Test Loads and Waveforms ....................................... 5
Data Retention Characteristics ....................................... 6
Data Retention Waveform ................................................ 6
Switching Characteristics ................................................ 7
Switching Waveforms ...................................................... 8
Typical DC and AC Characteristics .............................. 10
Truth Table ...................................................................... 11
Ordering Information ...................................................... 12
Ordering Code Definitions ......................................... 12
Package Diagrams .......................................................... 13
Acronyms ........................................................................ 15
Document Conventions ................................................. 15
Units of Measure ....................................................... 15
Document History Page ................................................. 16
Sales, Solutions, and Legal Information ...................... 17
Worldwide Sales and Design Support ....................... 17
Products .................................................................... 17
PSoC® Solutions ...................................................... 17
Cypress Developer Community ................................. 17
Technical Support ..................................................... 17
Document Number: 001-06512 Rev. *H
Page 2 of 17
CY62256VN
Product Portfolio
Product
CY62256VNLL
CY62256VNLL
CY62256VNLL
CY62256VNLL
Range
Min
Commercial
Industrial
Automotive-A
Automotive-E
2.7
2.7
2.7
2.7
V
CC
Range (V)
Typ
[1]
3.0
3.0
3.0
3.0
Max
3.6
3.6
3.6
3.6
Power Dissipation
Operating, I
CC
(mA)
Typ
[1]
11
11
11
11
Max
30
30
30
30
Standby, I
SB2
(A)
Typ
[1]
0.1
0.1
0.1
0.1
Max
5
10
10
130
Pin Configurations
Figure 1. 28-pin SOIC and 28-pin TSOP I pinouts
Narrow SOIC
Top View
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
I/O0
I/O1
I/O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
WE
A4
A3
A2
A1
OE
A0
CE
I/O7
I/O6
I/O5
I/O4
I/O3
OE
A
1
A
2
A
3
A
4
WE
V
CC
A
5
A
6
A
7
A
8
A
9
A
10
A
11
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
TSOP I
Top View
(not to scale)
A
0
CE
I/O
7
I/O
6
I/O
5
I/O
4
I/O
3
GND
I/O
2
I/O
1
I/O
0
A
14
A
13
A
12
A
11
A
10
A
9
A
8
A
7
A
6
A
5
V
CC
WE
A
4
A
3
A
2
A
1
OE
7
6
5
4
3
2
1
28
27
26
25
24
23
22
8
9
10
11
12
13
14
15
16
17
18
19
20
21
TSOP I
Reverse Pinout
Top View
(not to scale)
A
12
A
13
A
14
I/O
0
I/O
1
I/O
2
GND
I/O
3
I/O
4
I/O
5
I/O
6
I/O
7
CE
A
0
Pin Definitions
Pin Number
1–10, 21, 23–26 Input
11–13, 15–19
27
20
22
14
28
Input/Output
Input/Control
Input/Control
Input/Control
Ground
Power Supply
Type
A
0
–A
14
. Address inputs
I/O
0
–I/O
7
. Data lines. Used as input or output lines depending on operation.
WE.
When selected LOW, a WRITE is conducted. When selected HIGH, a READ is conducted.
CE.
When LOW, selects the chip. When HIGH, deselects the chip.
OE.
Output Enable. Controls the direction of the I/O pins. When LOW, the I/O pins behave as
outputs. When deasserted HIGH, I/O pins are tristated, and act as input data pins.
GND.
Ground for the device
V
CC
. Power supply for the device
Description
Note
1. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at V
CC
= V
CC
Typ, T
A
= 25 °C, and t
AA
= 70 ns.
Document Number: 001-06512 Rev. *H
Page 3 of 17
CY62256VN
Maximum Ratings
Exceeding maximum ratings may shorten the useful life of the
device. User guidelines are not tested.
Storage temperature ................................ –65 °C to +150 °C
Ambient temperature with
power applied .......................................... –55 °C to +125 °C
Supply voltage to ground potential
(pin 28 to pin 14)
[2]
.....................................–0.5 V to +4.6 V
DC voltage applied to outputs
in high Z State
[2]
................................ –0.5 V to V
CC
+ 0.5 V
DC input voltage
[2]
Static discharge voltage
(per MIL-STD-883, method 3015) ......................... > 2001 V
Latch-up current ................................................... > 200 mA
Operating Range
Device
Range
Ambient
Temperature (T
A
)
[3]
0 °C to +70 °C
–40 °C to +85 °C
–40 °C to +85 °C
–40 °C to +125 °C
V
CC
2.7 V to
3.6 V
CY62256VN Commercial
Industrial
Automotive-A
Automotive-E
............................. –0.5 V to V
CC
+ 0.5 V
Output current into outputs (LOW) ............................. 20 mA
Electrical Characteristics
Over the Operating Range
Parameter
V
OH
V
OL
V
IH
V
IL
I
IX
Description
Output HIGH voltage
Output LOW voltage
Input HIGH voltage
Input LOW voltage
Input leakage current
GND
V
IN
V
CC
Commercial/
Industrial/
Automotive-A
Automotive-E
I
OZ
Output leakage current
GND
V
IN
V
CC
,
Output Disabled
Commercial/
Industrial/
Automotive-A
Automotive-E
I
CC
V
CC
operating supply current
V
CC
= 3.6 V,
I
OUT
= 0 mA,
f = f
MAX
= 1/t
RC
V
CC
= 3.6 V,
CE
V
IH
,
V
IN
V
IH
or
V
IN
V
IL
,
f = f
MAX
All ranges
Test Conditions
I
OH
=
1.0
mA
I
OL
= 2.1 mA
V
CC
= 2.7 V
V
CC
= 2.7 V
-70
Min
2.4
–
2.2
–0.5
–1
Typ
[4]
–
–
–
–
–
Max
–
0.4
V
CC
+ 0.3
0.8
+1
Unit
V
V
V
V
A
–10
–1
–
–
+10
+1
A
A
–10
–
–
11
+10
30
A
mA
I
SB1
Automatic CE power-down
current - TTL inputs
All ranges
–
100
300
A
I
SB2
Automatic CE power-down
current - CMOS inputs
V
CC
= 3.6 V,
Commercial
CE
V
CC
– 0.3 V,
Industrial/
V
IN
V
CC
– 0.3 V or
Automotive-A
V
IN
0.3 V, f = 0
Automotive-E
–
–
–
0.1
5
10
130
A
Notes
2. V
IL
(min) = –2.0 V for pulse durations of less than 20 ns.
3. T
A
is the “Instant-On” case temperature.
4. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at V
CC
= V
CC
Typ, T
A
= 25 °C, and t
AA
= 70 ns.
Document Number: 001-06512 Rev. *H
Page 4 of 17
CY62256VN
Capacitance
Parameter
[5]
C
IN
C
OUT
Description
Input capacitance
Output capacitance
Test Conditions
T
A
= 25 °C, f = 1 MHz, V
CC
= 3.0 V
Max
6
8
Unit
pF
pF
Thermal Resistance
Parameter
[5]
JA
JC
Description
Thermal resistance
(junction to ambient)
Thermal resistance
(junction to case)
Test Conditions
Still air, soldered on a
3 × 4.5 inch, two-layer
printed circuit board
SOIC
68.45
26.94
TSOPI
87.62
23.73
RTSOPI
87.62
23.73
Unit
C/W
C/W
AC Test Loads and Waveforms
Figure 2. AC Test Loads and Waveforms
R1
V
CC
OUTPUT
50 pF
INCLUDING
JIG AND
SCOPE
R2
V
CC
10%
GND
ALL INPUT PULSES
90%
90%
10%
5 ns
Equivalent to:
THÉVENIN EQUIVALENT
R
th
OUTPUT
V
th
5 ns
Parameter
R1
R2
RTH
VTH
Value
1100
1500
645
1.750
Units
Ohms
Ohms
Ohms
Volts
Note
5. Tested initially and after any design or process changes that may affect these parameters.
Document Number: 001-06512 Rev. *H
Page 5 of 17
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
