Holtek Semiconductor Inc HT23C040 Datasheet

Features

Operating voltage: 2.7V~5.5V

·

Low power consumption

·

–

Operation: 25mA max. (VCC=5V)

–

Standby: 30mA max. (VCC=5V)

Access time: 120ns max. (VCC=5V)

·

10mA max. (V

10mA max. (V

250ns max. (V

CC

CC

=3V)

CC

=3V)

=3V)

General Description

The HT23C040 is a read-only memory with
high performance CMOS storage device whose
4096K of memory is arranged into 524288 word
by 8 bits.

For application flexibility, the chip enable and
output enable control pins can be selected as ac
tive high or active low. This flexibility not only
allows easy interface with most microproces
sors, but also eliminates bus contention in mul

HT23C040

CMOS 512K´8-Bit Mask ROM

524288´8-bit of mask ROM

·

Mask option: chip enable CE/CE/OE1/OE1,

·

and output enable OE/OE
TTL compatible inputs and outputs

·

Tristate outputs

·

Fully static operation

·

Package type: 32-pin DIP/SOP

·

tiple bus microprocessor systems. An
additional feature of the HT23C040 is its abil
ity to enter the standby mode whenever the
chip enable (CE/CE
current consumption to below 30mA. The combi
nation of these functions makes the chip suit

­able for high density low power memory

applications.

-

-

) is inactive, thus reducing

/NC

-

-

-

1 January 20, 2000

Block Diagram

HT23C040

A0

A18

CE/CE/OE1/O E1

OE/OE/NC

Pin Assignment

1

NC

A16

A15

A12

A7

A6

A5

A4

A3

A2

A1

A0

D0

D1

D2

VSS

32 D IP /S O P

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

HT23C040

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

Address

Buffers

CTRL

VCC

A18

A17

A14

A13

A8

A9

A11

OE/OE/NC

A10

CE/CE/OE1/O E1

D7

D6

D5

D4

D3

XY

Pre-decoder

ATD

Pre-charge C K T

Latch

X-Dec

Y-Dec

Z-D ec

VSS

Mux

VCC

Pull-high NM O S

ROM Cell

A rra y

(512K

8-Bits)

´

Z-se le ctor

S e n s e A m p lifie rs

Mux

Output Buffers

D0

D7

2 January 20, 2000

Pin Description

Pin Name I/O Description

NC

A0~A18 I Address inputs

D0~D7 O Data outputs

VSS

/OE1/OE1 I Chip enable/Output enable input

CE/CE

/NC I Output enable input

OE/OE

VCC

No connection

¾

Negative power supply

¾

Positive power supply

¾

Operation Truth Table

Mode CE/CE OE/OE A0~A18 D0~D7

Read H/L H/L Valid Data Out

Deselect H/L L/H X High Z

Standby L/H X X High Z

HT23C040

Note: H=VIH, L=VIL, X=VIHor V

IL

Absolute Maximum Ratings

Supply Voltage.................................-0.3V to 6V

Input Voltage .......................-0.3V to V

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo­sure to extreme conditions may affect device reliability.

CC

+0.3V

Storage Temperature.................-50°Cto125°C

Operating Temperature ..............-40°Cto85°C

3 January 20, 2000

D.C. Characteristics

HT23C040

Supply voltage: 4.5V~5.5V

Symbol Parameter

V

CC

I

CC1

V

IL1

V

IH1

V

OL1

V

OH1

I

LI

I

LO

I

STB1

I

STB2

C

IN

C

OUT

Operating Voltage

Operating Current 5V

Input Low Voltage 5V

Input High Voltage 5V

Output Low Voltage 5V

Output High Voltage 5V

Input Leakage Current 5V

Output Leakage Current 5V

Standby Current 5V

Standby Current 5V

Input Capacitance (See note)

Output Capacitance (See note)

Test Conditions

CC

Conditions

V

¾¾

O/P Unload,
f=5MHz

¾

¾

I

=3.2mA

OL

=-1mA

I

OH

V

=0 to V

IN

V

OUT

CE=V
CE=V

=0 to V

IL

IH

CC

CC

CE£0.2V

³VCC-0.2V

CE

f=1MHz

¾

f=1MHz

¾

T

=-40°Cto85°C

a

Min. Typ. Max. Unit

4.5

¾¾

V

SS

2.2

¾¾

2.4

¾¾

¾¾

¾¾

¾¾

¾¾

¾¾

¾

¾

¾

¾

5.5 V

25 mA

0.8 V

V

CC

0.4 V

V

CC

10

mA

10

mA

1.5 mA

30

mA

10 pF

10 pF

V

V

4 January 20, 2000

HT23C040

Supply voltage: 2.7V~3.3V

Test Conditions

Symbol Parameter

CC

Conditions

O/P Unload,
f=5MHz

¾

¾

I

=2mA

OL

=-0.6mA

I

OH

=0 to V

V

IN

V

=0 to V

OUT

f=1MHz

f=1MHz

CC

CC

V

I

V

V

V

V

I

I

C

C

CC

CC2

IL2

IH2

OL2

OH2

LI

LO

IN

OUT

V

Operating Voltage

¾¾

Operating Current 3V

Input Low Voltage 3V

Input High Voltage 3V

Output Low Voltage 3V

Output High Voltage 3V

Input Leakage Current 3V

Output Leakage Current 3V

Input Capacitance (See Note)

Output Capacitance (See Note)

¾

¾

Note: These parameters are periodically sampled but not 100% tested.

A.C. Characteristics

Symbol Parameter

t

CYC

t

AA

t

ACE

t

AOE

t

OH

t

OD

t

OE

Cycle Time 200

Address Access Time

Chip Enable Access Time

Output Enable Access Time

Output Hold Time

Output Disable Time (See Note)

Output Enable Time (See Note)

3V±10% 5V±10%

Min. Max. Min. Max.

¾

¾

¾

¾

250

250

150

¾¾

¾¾¾

¾¾

T

=-40°Cto85°C

a

Min. Typ. Max. Unit

2.7

¾¾

V

SS

1.5

¾¾

1.5

¾¾

¾¾

¾¾

¾¾

¾

¾

¾

¾

3.3 V

10 mA

0.4 V

V

CC

0.4 V

V

CC

10

10

10 pF

10 pF

V

V

mA

mA

Ta=-40°Cto85°C

Unit

120

¾

¾

¾

10

¾

120 ns

120 ns

80 ns

¾

ns

ns

70 ns

10

¾

ns

Note: These parameters are periodically sampled but not 100% tested.

5 January 20, 2000

A.C. test condition

Output load: see figure right

Input rise and fall time: 10ns

Input pulse levels: 0.4V to 2.4V

Input and output timing reference levels:

0.8V and 2.0V (V

1.5V (V

CC

=3V)

CC

=5V)

Functional Description

The HT23C040 has two modes, namely data
read mode and standby mode, controlled by
CE/CE

/OE1/OE1 and OE/OE/NC inputs.

·

Standby mode
The HT23C040 has lower current consumption,

controlled by the chip enable input (CE/CE
When a low/high level is applied to the CE/CE
input regardless of the output enable
(OE/OE
standby mode.

/NC) states, the chip will enter the

HT23C040

V

CC

1250

W

Output

775

W

* Including scope and jig

Output load circuit

·

Data read mode
When both the chip enable (CE/CE/

and the output enable (OE/OE
the chip is in data read mode. Otherwise, ac
tive CE/CE

).

deselect mode. The output will remain in Hi-Z
state.

and inactive OE/OE/NC result in

100pF*

OE1/OE1)

/NC) are active,

-

Timing Diagrams

·

Propagation delay due to address (CE/CE/OE1/OE1 and OE/OE are active)

t

CYC

t

t

ACE

AA

t

Valid

AOE

t

OH

Valid

t

OD

Valid

6 January 20, 2000

Address

D out

·

Propagation delay due to chip and output enable (address valid)

CE

CE

OE

OE

t

OE

D out

Characteristic Curves

HT23C040

CC

(N o rm a lize d )

O perating C urrent I

Ta=25 C

STB2

(N o rm a lize d )

Standby Current I

Ta=25 C

1.5

1.25

1

0.75

0.5

4.5 5 5.5

O perating V oltage VCC (V)

1.5

1.25

1

0.75

0.5

4.5 5 5.5

O perating V oltage V

CC

(V )

1.2

CC

1.1

1

0.9

(N o rm a lize d )

O perating C urrent I

0.8

-5 0 -2 5 0 2 5 5 0 7 5

V

CC

=5V

Tem perature ( C )

1.4

STB2

1.25

1.1

(N o rm a lize d )

0.95

Standby Current I

0.8

-5 0 -2 5 0 2 5 5 0 7 5

V

CC

=5V

Tem perature ( C )

AA

(N o rm a lize d )

A ccess Tim e T

Ta=25 C

1.2

1.1

1

0.9

0.8

4.5 5 5.5

O perating V oltage V

CC

( V )

1.5

1.25

AA

1

(N o rm a lize d )

0.75

A ccess Tim e T

0.5

-5 0 -2 5 0 2 5 5 0 7 5

V

CC

=5V

Tem perature ( C )

7 January 20, 2000

HT23C040

ACE

(N o r m a liz e d )

A ccess Tim e T

Ta=25 C

AOE

(N o r m a liz e d )

A ccess Tim e T

Ta=25 C

1.2

1.1

1

0.9

0.8

4.5 5 5.5

O perating Voltage V

CC

( V )

1.2

1.1

1

0.9

0.8

4.5 5 5.5

O perating Voltage VCC ( V )

ACE

A ccess Tim e T

VCC=5V

AOE

(N o rm a lize d )

A ccess Tim e T

VCC=5V

1.5

1.25

1

(N o r m a liz e d )

0.75

0.5

-5 0 -2 5 0 2 5 5 0 7 5

Tem perature ( C )

1.5

1.25

1

0.75

0.5

-5 0 -2 5 0 2 5 5 0 7 5

Tem perature ( C )

100

8 January 20, 2000

HT23C040 MASK ROM ORDERING SHEET

Custom:

Input Medium:

EPROM DISK File (Mail Address: [e-mail]) OTHER

HT23C040

User No. Type/Ref. Name

Control Pin and Package Form Option:

(a) 32 Pin Type Pin 22:

Pin 24: (1) OE (2) OE (3) NC

(b) Package Form:

Companion User No.

Package Marking :

Delivery Date : Q¢ty:

CUSTOM CONFIRMED BY:

(1) Chip Form (2) 32 DIP (3) 32 SOP

(1) CE (2) CE (3) OE1 (4) OE1

Q¢ty

Check Sum

Memory Address

Start End

(NAME, DATE, POSITION & CO. CHOP)

HOLTEK CONFIRMED BY:

(SALES) (SALES MANAGER)

9 January 20, 2000

HT23C040

Holtek Semiconductor Inc. (Headquarters)

No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]

Holtek Semiconductor Inc. (Taipei Office)

5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Fax: [phone] (International sales hotline)

Holtek Semiconductor (Hong Kong) Ltd.

RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: [phone]
Fax: [phone]

Copyright ã 2000 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

10 January 20, 2000

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