Microchip Technology Inc 27C256-90I-VS, 27C256-15I-VS, 27C256-15I-TS, 27C256-15I-SO, 27C256-15I-P Datasheet

27C256

256K (32K x 8) CMOS EPROM

FEATURES

PACKAGE TYPES

•

High speed performance

TSOP

- 90 ns access time available

OE

1

28 A10

•

CMOS Technology for low power consumption

A11

2

27 CE

A9

3

26 D7

-

20 mA Active current

A8

4

25

D6

A13

5

24 D5

-

100 A Standby current

A14

6

27C256

23

D4

VCC

7

22 D3

•

Factory programming available

VPP

8

21 VSS

•

Auto-insertion-compatible plastic packages

A12

9

20 D2

•

Auto ID aids automated programming

A7 10

19

D1

A6 11

18 D0

•

Separate chip enable and output enable controls

A5 12

17

A0

A4 13

16

A1

•

High speed “express” programming algorithm

A3 14

15 A2

• Organized 32K x 8: JEDEC standard pinouts

PLCC

A12

Vcc

A14

A13

-

28-pin Dual-in-line package

A7

VPP

NU

-

32-pin PLCC Package

4

3

2

1

32

31

30

A6

5

29

A8

-

28-pin SOIC package

A5 6

28

A9

- 28-pin Thin Small Outline Package (TSOP)

A4

7

27C256

27

A11

A3 8

26

NC

-

Tape and reel

A0

11

23

CE

-

28-pin Very Small Outline Package (VSOP)

A2

9

25

OE

A1

10

24

A10

•

Data Retention > 200 years

NC 12

22

O7

O0 13

21

O6

• Available for the following temperature ranges:

14

15

16

17

18

19

20

-

Commercial:

0˚C to +70˚C

DIP/SOIC

O1

O2

VSS

NU

O3

O4

O5

-

Industrial:

-40˚C to +85˚C

-

Automotive:

-40˚C to +125˚C

VPP

1

28

VCC

DESCRIPTION

A12

2

27

A14

A7

3

26

A13

A6

4

25

A8

The Microchip Technology Inc. 27C256 is a CMOS

A5

5

24

A9

A4

6

23

A11

bits (32K bytes).

Accessing individual bytes from an

27C256

A0

10

19

O7

256K bit electrically Programmable Read Only Memory

A3

7

22

OE

(EPROM). The device is organized as 32K words by 8

A2

8

21

A10

A1

9

20

CE

address transition or from power-up (chip enable pin

O0

11

18

O6

going low) is accomplished in less than 90 ns. This very

O1

12

17

O5

high speed device allows the most sophisticated micro-

O2

13

16

O4

VSS

14

15

O3

processors to run at full speed without the need for

WAIT states. CMOS design and processing enables

VSOP

this part to be used in systems where reduced power

consumption and reliability are requirements.

OE

22

21

A10

A complete family of packages is offered to provide the

A11

23

20

CE

A9

24

19

O7

most flexibility in applications. For surface mount appli-

A8

25

18

O6

cations, PLCC, SOIC, VSOP or TSOP packaging is

A13

26

27C256

17

O5

A14

27

16

O4

available. Tape and reel packaging is also available for

VCC

28

15

O3

PLCC or SOIC packages.

VPP

1

14

VSS

A12

2

13

O2

A7

3

12

O1

A6

4

11

O0

A5

5

10

A0

A4

6

9

A1

A3

7

8

A2

1996 Microchip Technology Inc.

DS11001L-page 1

27C256

1.0ELECTRICAL CHARACTERISTICS

1.1Maximum Ratings*

VCC and input voltages w.r.t. VSS ........	-0.6V to +7.25V
VPP voltage w.r.t. VSS during
programming .......................................	-0.6V to +14.0V
Voltage on A9 w.r.t. VSS ......................	-0.6V to +13.5V
Output voltage w.r.t. VSS ...............	-0.6V to VCC +1.0V
Storage temperature ..........................	-65˚C to +150˚C
Ambient temp. with power applied .....	-65˚C to +125˚C

*Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

TABLE 1-1: PIN FUNCTION TABLE

Name				Function
A0-A14				Address Inputs
				Chip Enable
	CE
				Output Enable
	OE
VPP				Programming Voltage
O0 - O7				Data Output
VCC				+5V Power Supply
VSS				Ground
	NC			No Connection; No Internal Connec-
				tion
	NU			Not Used; No External Connection Is
				Allowed

TABLE 1-2:

READ OPERATION DC CHARACTERISTICS

VCC = +5V (±10%)

Commercial:

Tamb = 0˚C to +70˚C

Industrial:

Tamb = -40˚C to +85˚C

Extended (Automotive):

Tamb = -40°C to +125°C

Parameter

Part*

Status

Symbol

Min.

Max.

Units

Conditions

Input Voltages

all

Logic "1"

VIH

2.0

VCC+1

V

Logic "0"

VIL

-0.5

0.8

V

Input Leakage

all

—

I LI

-10

10

A

VIN = 0 to VCC

Output Voltages

all

Logic "1"

VOH

2.4

V

IOH = -400 A

Logic "0"

VOL

0.45

V

IOL = 2.1 mA

Output Leakage

all

—

I LO

-10

10

A

VOUT = 0V to VCC

Input Capacitance

all

—

C IN

—

6

pF

V IN = 0V; Tamb = 25°C;

f = 1 MHz

Output Capacitance

all

—

C OUT

—

12

pF

V OUT = 0V; Tamb = 25°C;

f = 1 MHz

Power Supply Current,

C

TTL input

ICC1

—

20

mA

VCC = 5.5V; VPP = VCC

Active

I,E

TTL input

ICC2

—

25

mA

f = 1 MHz;

=

= VIL;

OE

CE

IOUT = 0 mA;

VIL = -0.1 to 0.8V;

VIH = 2.0 to VCC;

Note 1

Power Supply Current,

C

TTL input

ICC(S)

—

2

mA

Standby

I, E

TTL input

3

mA

all

CMOS input

100

A

= VCC ± 0.2V

CE

IPP Read Current

all

Read Mode

IPP

100

A

VPP = 5.5V

VPP Read Voltage

all

Read Mode

VPP

VCC-0.7

VCC

V

* Parts: C=Commercial Temperature Range; I, E=Industrial and Extended Temperature Ranges

Note 1: Typical active current increases .75 mA per MHz up to operating frequency for all temperature ranges.

DS11001L-page 2

1996 Microchip Technology Inc.

27C256

TABLE 1-3:

READ OPERATION AC CHARACTERISTICS

AC Testing Waveform:

VIH = 2.4V and VIL = 0.45V; VOH = 2.0V VOL = 0.8V

Output Load:

1 TTL Load + 100 pF

Input Rise and Fall Times: 10 ns

Ambient Temperature:

Commercial:

Tamb = 0˚C to +70˚C

Industrial:

Tamb = -40˚C to +85˚C

Automotive:

Tamb = -40°C to +125°C

Parameter

Sym

27C256-90*

27C256-10*

27C256-12

27C256-15

27C256-20

Units

Conditions

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Address to Output

tACC

—

90

—

100

—

120

—

150

—

200

ns

CE

=VIL

=OE

Delay

to Output Delay

tCE

—

90

—

100

—

120

—

150

—

200

ns

OE

= VIL

CE

to Output Delay

tOE

—

40

—

45

—

55

—

65

—

75

ns

CE

= VIL

OE

or

to O/P

tOFF

0

30

0

30

0

35

0

50

0

55

ns

CE

OE

High Impedance

Output Hold from

tOH

0

—

0

—

0

—

0

—

0

—

ns

Address

or

CE

OE,

whichever goes first

* -10, -90 AC Testing Waveform: VIH = 2.4V and VIL = .45V; VOH = 1.5V and VOL = 1.5V

Output Load: 1 TTL Load + 30pF

FIGURE 1-1:

READ WAVEFORMS

VIH

Address Valid

Address

VIL

VIH

CE

VIL

tCE(2)

VIH

OE

VIL

tOE(2)

tOFF(1,3)

tOH

Outputs

VOH

High Z

High Z

Valid Output

O0 - O7

VOL

tACC

Notes: (1) tOFF is specified for OE or CE, whichever occurs first

(2)OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE

(3)This parameter is sampled and is not 100% tested.

1996 Microchip Technology Inc.

DS11001L-page 3

27C256

TABLE 1-4:	PROGRAMMING DC CHARACTERISTICS
				Ambient Temperature: Tamb = 25°C ± 5°C
				VCC = 6.5V ± 0.25V, VPP = VH = 13.0V ± 0.25V
Parameter		Status	Symbol	Min	Max.	Units	Conditions
Input Voltages		Logic”1”	VIH	2.0	VCC+1	V
		Logic”0”	VIL	-0.1	0.8	V
Input Leakage		—	I LI	-10	10	A	VIN = 0V to VCC
Output Voltages		Logic”1”	VOH	2.4		V	IOH = -400 A
		Logic”0”	VOL		0.45	V	IOL = 2.1 mA
VCC Current, program & verify		—	I CC2	—	20	mA	Note 1
VPP Current, program		—	I PP2	—	25	mA	Note 1
A9 Product Identification		—	VH	11.5	12.5	V
Note 1: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP
TABLE 1-5:	PROGRAMMING AC CHARACTERISTICS
for Program, Program Verify		AC Testing Waveform:			VIH=2.4V and VIL=0.45V; VOH=2.0V; VOL=0.8V
and Program Inhibit Modes		Output Load:			1 TTL Load + 100pF
		Ambient Temperature:			Tamb=25°C ± 5°C

VCC= 6.5V ± 0.25V, VPP = VH = 13.0V ± 0.25V

					Parameter	Symbol	Min.	Max.	Units	Remarks
	Address Set-Up Time					tAS	2	—	s
	Data Set-Up Time					tDS	2	—	s
	Data Hold Time					tDH	2	—	s
	Address Hold Time					tAH	0	—	s
	Float Delay (2)					tDF	0	130	ns
	VCC Set-Up Time					tVCS	2	—	s
	Program Pulse Width (1)					tPW	95	105	s	100 s typical
			Set-Up Time			tCES	2	—	s
	CE
			Set-Up Time			tOES	2	—	s
	OE
	VPP Set-Up Time					tVPS	2	—	s
	Data Valid from					tOE	—	100	ns
				OE

Note 1: For express algorithm, initial programming width tolerance is 100 s ±5%.

2:This parameter is only sampled and not 100% tested. Output float is defined as the point where data is no longer driven (see timing diagram).

DS11001L-page 4

1996 Microchip Technology Inc.