UTRON UT62W256CPC-70LL, UT62W256CPC-70L, UT62W256CPC-35L, UT62W256CPC-35LL, UT62W256CLS-70LL Datasheet

UTRON

UT62W256C

Rev. 1.0

32K X 8 BIT LOW POWER CMOS SRAM

UTRON TECHNOLOGY INC. P80069
1F, No. 11, R&D Rd. II, Science-Based Industrial Park, Hsinchu, Taiwan, R. O. C.
TEL: [phone] FAX: [phone]

1



FEATURES



Access time : 35/70ns



Low power consumption:

Operation : 40/20 mA (max.) (V

CC

≦3.6

V)

50/40 mA (max.) (V

CC

≦5.5

V)

Standby : -L / -LL version

1 / 0.5uA (typical) V

CC

=2.7~3.6

V

2 / 1uA (typical) V

CC

=4.5~5.5

V



Wide Range power supply: 2.7V~5.5V



All inputs and outputs are TTL compatible



Fully static operation



Three state outputs



Data retention voltage : 1.5V (min.)



Package : 28-pin 600 mil PDIP

28-pin 330 mil SOP

28-pin 8x13.4mm STSOP

FUNCTIONAL BLOCK DIAGRAM

COLUMN I/O

COLUMN DECODER

ROW

DECODER

I/O

CONTROL

LOGI C

CONTROL

A4

I/O1

VSS

VCC

WE

OE

CE

I/O8

A3

A

14

A

13

A

12

A7

A6

A5

A8

A9 A2 A1 A0 A

10

.

.

.

.

.

.

MEMORY ARRAY

512 ROWS × 512 COLUMNS

A

11

PIN DESCRIPTION

SYMBOL DESCRIPTION

A0 - A14 Address Inputs

I/O1 - I/O8 Data Inputs/Outputs

CE

Chip Enable Input

WE

Write Enable Input

OE

Output Enable Input

VCC Power Supply
VSS Ground

GENERAL DESCRIPTION

The UT62W256C is a 262,144-bit low power
CMOS static random access memory organized
as 32,768 words by 8 bits. It is fabricated using
high performance, high reliability CMOS
technology . its standby current is stable within the
range of operating temperature.

The UT62W256C is designed for high-speed and
low power application. It is particularly well
suited for battery back-up nonvolatile memory
application.

The UT62W256C operates with wide range power
supply and all inputs and outputs are fully TTL
compatible

PIN CONFIGURATION

A12

A7

A6

A5

A4

A3

A2

A1

A0

I/O1

I/O2

Vcc

A8

A9

A11

A10

I/O8

I/O7

I/O6

I/O5

I/O4

I/O3

Vss

UT62W256C

PDIP/SOP

28

14

13

12

11

10

9

8

7

6

5

4

3

2

1

17

16

15

20

19

18

22

23

24

25

26

27

21

CE

WE

OE

A13

A14

I/O4

A11

A9

A8

A13

I/O3

A10

A14

A12

A7

A6

A5

Vcc

I/O8

I/O7

I/O6

I/O5

Vss

I/O2

I/O1

A0

A1

A2

A4

A3

UT62W256C

STSOP

28

14

13

12

11

10

9

8

7

6

5

4

3

2

1

17

16

15

20

19

18

22

23

24

25

26

27

21

WE

OE

CE

UTRON

UT62W256C

Rev. 1.0

32K X 8 BIT LOW POWER CMOS SRAM

UTRON TECHNOLOGY INC. P80069
1F, No. 11, R&D Rd. II, Science-Based Industrial Park, Hsinchu, Taiwan, R. O. C.
TEL: [phone] FAX: [phone]

2



ABSOLUTE MAXIMUM RATINGS

*

PARAMETER SYMBOL RATING UNIT

Terminal Voltage with Respect to VSS V

TERM

-0.5 to +7.0 V

Operation Temperature TA 0 to +70

℃

Storage Temperature T

STG

-65 to +150

℃

Power Dissipation PD 1 W
DC Output Current I

OUT

50 mA

Soldering Temperature (under 10 sec) Tsolder 260

℃

*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 or any other conditions above those indicated in the operational sections

of this specification is not implied. Exposure to the absolute maximum rating conditions for extended period may affect device

reliability.

TRUTH TABLE

MODE

CE

OE

WE

I/O OPERATION SUPPLY CURRENT

Standby H X X High - Z ISB, I

SB1

Output Disable L H H High - Z ICC,I

CC1,ICC2

Read L L H D

OUT

I

CC,ICC1,ICC2

Write L X L DIN I

CC,ICC1,ICC2

Note: H = VIH, L=VIL, X = Don't care.

DC ELECTRICAL CHARACTERISTICS

(TA = 0℃ to 70℃)

PARAMETER

SYMBOL

TEST CONDITION

MIN. TYP. MAX. MIN. TYP. MAX.

UNIT

Power Supply Voltage VCC 2.7~3.6 4.5~5.5 V
Input High Voltage VIH 2.0 -

VCC+0.5

2.2 -

VCC+0.5

V
Input Low Voltage VIL - 0.5 - 0.6 - 0.5 - 0.8 V
Input Leakage Current ILI VSS ≦VIN ≦VCC - 1 - 1 - 1 - 1

µ

A

Output Leakage
Current

I

LO

V

SS

≦V

I/O

≦VCC,

CE

=VIH or OE = VIH

or

WE

= VIL

- 1 - 1 - 1 - 1

µ

A

Output High Voltage VOH IOH= - 1mA 2.2 - - 2.4 - - V
Output Low Voltage VOL IOL= 4mA - - 0.4 - - 0.4 V

- 35 - - 40 - 40 50 mA

ICC

CE

= VIL ,I

I/O

=

0mA ,Cycle=Min.

- 70

- - 20 - 30 40 mA

ICC1

Cycle=1µs CE=0.2V;

I

I/O

= 0mA other pins at

0.2V or V

CC

-0.2V

- - 6 - - 10 mA

Operation Power
Supply Current

ICC2

Cycle=500nsCE=0.2V

; I

I/O

= 0mA other pins

at 0.2V or V

CC

-0.2V

- - 12 - - 20 mA

ISB

CE

=VIH

- 3 - 3 mA

-L - 1 40 - 2 100 µA

Standby Power Supply
Current

I

SB1

CE

≧

V

CC

-0.2V

-LL - 0.5 20 - 1 50 µA

UTRON

UT62W256C

Rev. 1.0

32K X 8 BIT LOW POWER CMOS SRAM

UTRON TECHNOLOGY INC. P80069
1F, No. 11, R&D Rd. II, Science-Based Industrial Park, Hsinchu, Taiwan, R. O. C.
TEL: [phone] FAX: [phone]

3



CAPACITANCE

(TA=25℃, f=1.0MHz)

PARAMETER SYMBOL MIN. MAX UNIT

Input Capacitance C

IN

-

8 pF

Input/Output Capacitance C

I/O

-

10 pF

Note : These parameters are guaranteed by device characterization, but not production tested.

AC TEST CONDITIONS

Input Pulse Levels 0V to 3.0V
Input Rise and Fall Times 5ns
Input and Output Timing Reference Levels 1.5V
Output Load CL = 100pF, IOH/IOL = -1mA/4mA

AC ELECTRICAL CHARACTERISTICS

(VCC = 2.7V~5.5V , TA = 0℃ to 70℃)

(1) READ CYCLE

UT62W256C-35 UT62W256C-70

PARAMETER

SYMBOL

MIN. MAX. MIN. MAX.

UNIT

Read Cycle Time

tRC 35 - 70 - ns

Address Access Time

tAA - 35 - 70 ns

Chip Enable Access Time

t

ACE

- 35 - 70 ns

Output Enable Access Time

tOE - 25 - 35 ns

Chip Enable to Output in Low Z

t

CLZ*

10 - 10 - ns

Output Enable to Output in Low Z

t

OLZ*

5 - 5 - ns

Chip Disable to Output in High Z

t

CHZ*

- 25 - 35 ns

Output Disable to Output in High Z

t

OHZ*

- 25 - 35 ns

Output Hold from Address Change

tOH 5 - 5 - ns

(2) WRITE CYCLE

UT62W256C-35 UT62W256C-70

PARAMETER SYMBOL

MIN. MAX. MIN. MAX.

UNIT

Write Cycle Time

tWC 35 - 70 - ns

Address Valid to End of Write

tAW 30 - 60 - ns

Chip Enable to End of Write

tCW 30 - 60 - ns

Address Set-up Time

tAS 0 - 0 - ns

Write Pulse Width

tWP 25 - 50 - ns

Write Recovery Time

tWR 0 - 0 - ns

Data to Write Time Overlap

tDW 20 - 30 - ns

Data Hold from End of Write Time

tDH 0 - 0 - ns

Output Active from End of Write

t

OW*

5 - 5 - ns

Write to Output in High Z

t

WHZ*

- 15 - 25 ns

*These parameters are guaranteed by device characterization, but not production tested.

UTRON

UT62W256C

Rev. 1.0

32K X 8 BIT LOW POWER CMOS SRAM

UTRON TECHNOLOGY INC. P80069
1F, No. 11, R&D Rd. II, Science-Based Industrial Park, Hsinchu, Taiwan, R. O. C.
TEL: [phone] FAX: [phone]

4



TIMING WAVEFORMS

READ CYCLE 1

(Address Controlled)

(1,2,4)

t

RC

Address

DOUT Data Valid

t

AA

t

OH

t

OH

READ CYCLE 2

(CE and

OE

Controlled)

(1,3,5,6)

D

OUT

Address

CE

OE

t

RC

t

AA

t

ACE

t

OE

t

CLZ

t

OLZ

High-z

t

OHZ

t

CHZ

Data valid

High-Z

t

OH

Notes :

1.

WE

is HIGH for read cycle.

2. Device is continuously selected

CE

=V

IL.

3. Address must be valid prior to or coincident with

CE

transition; otherwise t

AA

is the limiting parameter.

4.

OE

is LOW.

5. t

CLZ

, t

OLZ

, t

CHZ

and t

OHZ

are specified with CL = 5pF. Transition is measured ±500mV from steady state.

6. At any given temperature and voltage condition, t

CHZ

is less than t

CLZ

, t

OHZ

is less than t

OLZ.