CYPRESS CY62256V User Manual

CY62256V

256K (32K x 8) Static RAM

Features

• Temperature Ranges
— Commercial: 0°C to 70°C

— Industrial: –40°C to 85°C

— Automotive: –40°C to 125°C

• Speed: 70 ns and 100 ns

• Low voltage range:
— CY62256V (2.7V–3.6V)

— CY62256V25 (2.3V–2.7V)

• Low active power and standby power

• Easy memory expansion with CE

• TTL-compatible inputs and outputs

• Automatic power-down when deselected

• CMOS for optimum speed/power

• Package available in a standard 450-mil-wide (300-mil

body width) 28-lead narrow SOIC, 28-lead TSOP-1, and
reverse 28-lead TSOP-1 package

Logic Block Diagram

and OE features

Functional Description

[1]

The CY62256V 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 three-state
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
writing/reading operation of the memory. When CE

) controls the

and WE
inputs are both LOW, data on the eight data input/output pins
(I/O

through I/O7) is written into the memory location

0

addressed by the address present on the address pins (A
through A14). Reading the device is accomplished by selecting
the device and enabling the outputs, CE
while WE

remains inactive or HIGH. Under these conditions,

and OE active LOW,

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.

0

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

0

1

2

3

4

5

6

7

INPUTBUFFER

A

10

A

9

A

8

A

7

A

6

A

5

A

4
3
2

ROW DECODER

A
A

CE
WE

OE

Note:

1. For best practice recommendations, please refer to the Cypress application note “System Design Guidelines” on http://www.cypress.com.

512 × 512

ARRA

COLUMN

DECODER

14

A13A11A

A

Y

SENSE AMPS

POWER

DOWN

0

1

12

A

A

Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05057 Rev. *D Revised June 28, 2004

CY62256V

Product Portfolio

Power Dissipation

Product

VCC Range (V) Speed

Range Min. Typ.

[2]

Max. (ns) Typ.

Operating, ICC (mA) Standby, I

[2]

Max. Typ.

[2]

SB2

(µA)

Max.

CY62256VLL Com’l / Ind’l 2.7 3.0 3.6 70 11 30 0.1 5
CY62256VLL Automotive 2.7 3.0 3.6 70 11 30 0.1 130
CY62256V25LL Com’l 2.3 2.5 2.7 100 9 15 0.1 4

Pin Configurations

Narrow SOIC

Top View

A
A

A
A

A

A
A
A
A
A

I/O
I/O
I/O

GND

10
11
12
13
14

1

5

2

6

3

7

4

8

5

9

6
7
8
9
10
11

0

12

1

13

2

14

28
27
26
25

24
23

22
21
20
19

18
17

16
15

V

CC

WE

A

4

A

3

A

2

A

1

OE
A

0

CE
I/O

I/O
I/O
I/O
I/O

A

7

11

A

6

10

A

5

9

A

4

8

3

A

7

2

A

6

1

A

5

28

V

CC

27

WE

26

A

7
6

5
4

A
A
A

OE

4

25

3

24

2

23

1

22

TSOP I

Reverse Pinout

Top Vi e w

(not to scale)

8

A

12

9

A

13

A

10

14

11

I/O

0

12

I/O

1

13

I/O

2

14

GND

15

I/O

3

16

I/O

4

17

I/O

5

18

I/O

6

19

I/O

7

20

CE

21

A

0

OE

WE

V

A
A

A
A

A
A

CC

A
A

A
A
A

10
11

22
23

1

24

2

25

3

26

4

27
28
1

5
6

7

8
9

2
3
4
5
6
7

(not to scale)

3

Pin Definitions

Pin Number Type Description

1-10, 21, 23-26 Input A0-A14. Address Inputs
11-13, 15-19 Input/Output I/O
27 Input/Control WE

20 Input/Control CE
22 Input/Control OE

14 Ground GND. Ground for the device
28 Power Supply Vcc. Power supply for the device

Notes:

2. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at V

-I/O7. Data lines. Used as input or output lines depending on operation

0

. When selected LOW, a WRITE is conducted. When selected HIGH, a READ

is conducted

. When LOW, selects the chip. When HIGH, deselects the chip

. 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 three-stated, and act as
input data pins

TSOP I

Top V iew

= VCC Typ., TA = 25°C, and t

CC

21

A

0

20

CE

19

I/O

7

18

I/O

6

17

I/O

5

16

I/O

4

I/O

15

3

14

GND

13

I/O

2

12

I/O

1

11

I/O

0

10

A

14

9

A

13

8

A

12

= 70 ns.

AA

Document #: 38-05057 Rev. *D Page 2 of 13

CY62256V

Maximum Ratings

Static Discharge Voltage.......................................... > 2001V

(per MIL-STD-883, Method 3015)
(Above which the useful life may be impaired. For user guide­lines, not tested.)

Storage Temperature .................................–65°C to +150°C

Latch-up Current.................................................... > 200 mA

Operating Range

Ambient Temperature with

Power Applied.............................................–55°C to +125°C

Supply Voltage to Ground Potential

(Pin 28 to Pin 14) ...........................................–0.5V to +4.6V

DC Voltage Applied to Outputs
in High-Z State

DC Input Voltage

[3]

....................................–0.5V to VCC + 0.5V

[3]

.................................–0.5V to VCC + 0.5V

Output Current into Outputs (LOW) .............................20 mA

Device Range

CY62256V Commercial 0°C to +70°C 2.7V to

CY62256V25 Commercial 0

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions

V
V
V

V
I

IX

I

OZ

I

CC

I

SB1

I

SB2

OH

OL

IH

IL

Output HIGH Voltage IOH = −1.0 mA V
Output LOW Voltage IOL = 2.1 mA V
Input HIGH Voltage 2.2 V

Input Leakage Voltage –0.5 0.8 V
Input Leakage Current GND < VIN < V

Output Leakage Current GND < V

VCC Operating Supply
Current

Automatic CE Power-down
Current— TTL Inputs

Automatic CE Power-down
Current— CMOS Inputs

VCC = 3.6V, I
f = f

MAX

VCC = 3.6V, CE > VIH,
V

> VIH or VIN < VIL, f = f

IN

V

= 3.6V, CE > VCC – 0.3V

CC

V

> VCC – 0.3V or VIN < 0.3V, f = 0

IN

CC

< VCC, Output Disabled Com’l, Ind’l –1 +1 µA

IN

= 0 mA,

OUT

= 1/t

RC

MAX

Ambient

Temperature

Industrial −40

Automotive −40

(TA)

+85

+125

[4]

°C to

°C

°C to

°C

V

CC

3.6V

°C to +70°C 2.3V to

2.7V

CY62256V-70

[2]

Max.

= 2.7V 2.4 V

CC

= 2.7V 0.4 V

CC

+0.3V

Com’l, Ind’l –1 +1 µA
Automotive -10 +10 µA

Automotive -10 +10 µA
All ranges 11 30 mA

All ranges 100 300 µA

Com’l 0.1 5
Ind’l 10
Automotive 130

CC

UnitMin. Typ.

V

Electrical Characteristics Over the Operating Range

CY62256V25-100

[2]

Parameter Description Test Conditions

V

OH

V

OL

V

IH

V

IL

I

IX

I

OZ

Notes:

3. V

(min.) = –2.0V for pulse durations of less than 20 ns.

IL

is the “Instant-On” case temperature

4. T

A

Output HIGH Voltage IOH = −0.1 mA Vcc=2.3V 2 V
Output LOW Voltage IOL = 0.1 mA Vcc= 2.3V 0.4 V
Input HIGH Voltage 1.7 Vcc +

Input LOW Voltage –0.3 0.7 V
Input Leakage Current GND < VIN < V
Output Leakage Current GND < V

< VCC, Output Disabled –1 +1 µA

IN

CC

–1 +1 µA

Document #: 38-05057 Rev. *D Page 3 of 13

Max.

0.3V

UnitMin. Typ.

V

Electrical Characteristics Over the Operating Range (continued)

Parameter Description Test Conditions

I

CC

I

SB1

I

SB2

Capacitance

VCC Operating Supply Current VCC = 2.7V, I

Automatic CE Power-down
Current— TTL Inputs

Automatic CE Power-down
Current — CMOS Inputs

[5]

Parameter Description Test Conditions Max. Unit

C

IN

C

OUT

Input Capacitance TA = 25°C, f = 1 MHz,
Output Capacitance 8 pF

AC Test Loads and Waveforms

V

CC

OUTPUT

INCLUDING

JIG AND

R1

50 pF

SCOPE

= 1/t

RC

V

= 2.7V, CE > VIH,

CC

> VIH or VIN < VIL, f = f

V

IN

V

= 2.7V, CE > VCC − 0.3V

CC

> VCC – 0.3V or VIN < 0.3V, f = 0

V

IN

R2

Equivalent to: THÉ VENIN EQUIVALENT

OUTPUT V

V

OUT

CC

= 3.0V

= 0 mA, f = f

V

CC

<5ns

R

th

10%

GND

CY62256V

CY62256V25-100

[2]

Com’l, Ind’l 9 15 mA

MAX

Com’l, Ind’l 75 225 µA

MAX

Com’l 0.1 4
Ind’l 8

6pF

ALL INPUT PULSES

90%

th

90%

10%

<5ns

Max.

UnitMin. Typ.

Parameter 3.3V 2.5V Units

R1 1100 16600 Ohms

R2 1500 15400 Ohms
RTH 645 8000 Ohms
VTH 1.750 1.20 Volts

Notes:

5. Tested initially and after any design or process changes that may affect these parameters.

Document #: 38-05057 Rev. *D Page 4 of 13