Datasheet EN27C51290T, EN27C51290PI, EN27C51290P, EN27C51290JI, EN27C51290J Datasheet (EON)

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

1

FEATURES

•

Fast Read Access Time

:

-45, -55, -70, and -90ns

•

Single 5V Power Supply

•

Programming Voltage +12.75V

•

QuikRite

TM

Programming Algorithm

•

Typical programming time 20µs

•

Low Power CMOS Operation

• 1µ

A Standby (Typical)

•

30mA Operation (Max.)

•

CMOS- and TTL-Compatible I/O

•

High-Reliability CMOS Technology

•

Latch-Up Immunity to 100mA
from -1V to V

CC

+ 1V

•

Two-Line Control (

OE&CE)

•

Standard Product Identification Code

•

JEDEC Standard Pinout

•

28-pin PDIP

•

32-pin PLCC

•

28-pin TSOP (Type 1)

•

Commercial and Industrial Temperature
Ranges

GENERAL DESCRIPTION

The EN27C512 is a low-power 512Kbit, 5V-only one-time-programmable (OTP) read-only
memory (EPROM). Organized into 64K words with 8 bits per word, it features QuikRite

TM

single-

address location programm ing, typically at 20µs per byte. Any byte can be accessed in less than
45ns, eliminating the need for W AIT states in high-performance microprocessor systems. The
EN27C512 has separate Output Enable (

OE ) and Chip Enable ( CE ) controls which eliminate

bus contention issues.

FIGURE 1. PDIP

Pin Name Function

A0-A15 Addresses
DQ0-DQ7 Outputs

CE Chip Enable
OE Output Enable

NC No Connect

EN27C512 512KBIT EPROM (64K x 8)

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

2

FIGURE 2. TSOP

FIGURE 3. PLCC

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

3

FIGURE 4. BLOCK DIAGRAM

FUNCTIONAL DESCRIPTION
THE QUIKRITETM PROGRAMMING OF THE EN27C512

When the EN27C512 is delivered, the chip has all 512K bits in the “ONE”, or
HIGH state. “ZEROs” are loaded into the EN27C512 through the procedure of programming.

The programming mode is entered when 12.75 ± 0.25V is applied to the

OE/V

PP

pin and

CEis at V

IL

. For programming, the data to be programmed is applied with 8 bits in parallel to

the data pins.

The QUIKRITE

TM

programming flowchart in Figure 5 shows Eon’s interactive programming
algorithm. The interactive algorithm reduces programming time by using 20 µs to 100 µs
programming pulses and giving each address only as many pulses as is necessary in order to

reliably program the data. After each pulse is applied to a given address, the data in that
address is verified. If the data is not verified, additional pulses are given until it is verified or
until the maximum number of pulses is reached. This process is repeated while sequencing
through each address of the EN27C512. This part of the programming algorithm is done at
V

CC

= 6.25V to assure that each EPROM bit is programmed to a sufficiently high threshold

voltage. This ensures that all bits have sufficient margin. After the final address is completed,
the entire EPROM memory is read at V

CC

= 5.25 ± 0.25V to verify the entire memory.

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

4

PROGRAM INHIBIT MODE

Programming of multiple EN27C512 in parallel with different data is also easily accomplished
by using the Program Inhibit Mode. Except for

CE, all like inputs of the parallel EN27C512

may be common. A TTL low-level program pulse applied to an EN27C512

CEinput with

OE/V

PP

= 12.75 ± 0.25V will program that EN27C512. A high-level CEinput inhibits the

other EN27C512 from being programmed.

PROGRAM VERIFY MODE

Verification should be performed on the programmed bits to determining that they were
correctly programmed. The verification should be performed with

OE/V

PP

and CEat VIL. Data

should be verified at

t

DV

after the falling edge of CE.

AUTO PRODUCT IDENTIFICATION

The Auto Product Identification mode allows the reading out of a binary code from an EPROM that
will identify its manufacturer and type. This mode is intended for use by programming equipment
for the purpose of automatically matching the device to be programmed with its corresponding
programming algorithm. This mode is functional in the 25°C ± 5°C ambient temperature range
that is required when programming the EN27C512.

To activate this mode, the programming equipment must force 12.0 V ± 0.5V on address line A9
of the EN27C512. Two identifier bytes may then be sequenced from the device outputs by

toggling address line A0 from V

IL

to VIH, when A1 = VIH. All other address lines must be held at

V

IL

during Auto Product Identification mode.

Byte 0 (A0 = V

IL

) represents the manufacturer code, and byte 1 (A0 = VIH), the device code. For
the EN27C512, these two identifiers bytes are given in the Mode Select Table. All identifiers for
manufacturer and device codes will possess odd parity, with the MSB (DQ7) defined as the parity

bit.

When A1 = VIL, the EN27C512 will read out the binary code of 7F, continuation code, to

signify the unavailability of manufacturer ID codes.

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

5

READ MODE

The EN27C512 has two control functions, both of which must be logically satisfied in order to
obtain data at the outputs. Chip Enable (

CE) is the power control and should be used for

device selection. Output Enable (

OE) is the output control and should be used to gate data to

the output pins, independent of device selection. Assuming that addresses are stable,
address access time (t

ACC

) is equal to the delay from CE to output (tCE) . Data is available at

the outputs (t

OE

) after the falling edge of OE, assuming the CEhas been LOW and

addresses have been stable for at least t

ACC

- tOE.

STANDBY MODE

The EN27C512 has CMOS standby mode which reduces the maximum V

CC

current to 20µA.

It is placed in CMOS standby when

CEis at V

CC

± 0.3 V. The EN27C512 also has a TTL-

standby mode which reduces the maximum V

CC

current to 1.0 mA. It is placed in TTL-

standby when

CEis at V

IH

. When in standby mode, the outputs are in a high-impedance

state, independent of the

OEinput.

TWO-LINE OUTPUT CONTROL FUNCTION

To accommodate multiple memory connections, a two-line control function is provided to allow
for:

1. Low memory power dissipation,

2. Assurance that output bus contention will not occur.

It is recommended that

CEbe decoded and used as the primary device-selection function, while

OEbe made a common connection to all devices in the array and connected to the READ line

from the system control bus. This assures that all deselected memory devices are in their low­power standby mode and that the output pins are only active when data is desired from a
particular memory device.

SYSTEM CONSIDERATIONS

During the switch between active and standby conditions, transient current peaks are produced
on the rising and falling edges of Chip Enable. The magnitude of these transient current peaks
is dependent on the output capacitance loading of the device. At a minimum, a 0.1µF ceramic
capacitor (high frequency, low inherent inductance) should be used on each device between V

CC

and VSS to minimize transient effects. In addition, to overcome the voltage drop caused by the
inductive effects of the printed circuit board traces on EPROM arrays, a 4.7µF bulk electrolytic
capacitor should be used between V

CC

and VSS for each eight devices. The location of the

capacitor should be close to where the power supply is connected to the array.

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

6

MODE SELECT TAB

Mode CE

OE

/

V

PP

A0 A9 Output

Read

V

IL

V

IL

XXD

OUT

Output Disable

V

IL

V

IH

X X High Z

Standby (TTL)

V

IH

X X X High Z

Standby (CMOS)

V

CC

± 0.3V

X X X High Z

Program

(4)

V

IL

V

PP

XXD

IN

Program Verify

V

IL

V

IL

XXD

OUT

Program Inhibit

V

IH

V

p p

X X High Z

Manufacturer Code

(3)

V

IL

V

IL

V

IL

VH(1) 1C

Device Code

(3)

V

IL

V

IL

V

IH

VH

(1)

83

NOTES:

1) VH = 12.0V ± 0.5V

2) X = Either V

IH

or V

IL

3) For Manufacturer Code and Device Code, A1 = V

IH

When A1 = VIL, both codes will read 7F

4) See DC Programming Characteristics for V

PP

voltage during programming

EON’S STANDARD PRODUCT IDENTIFICATION CODE

Pins

Hex

Data

Code

A0 A1 DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0

Manufacturer

01000111001C

Device Type

111000001183

Continuation

00011111117F
10011111117F

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

7

FIGURE 5. QUIKRITETM PROGRAMMING FLOW CHART

NOTE 1: Either 100µs or 20µs pulse.

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

8

ABSOLUTE MAXIMUM RATINGS

Storage Temperature

-65àC to +125àC

Ambient Temperature

with Power Applied -40àC to +85àC

Voltage with Respect to V

SS

All pins except A9, VPP, V

CC

-0.6V to VCC + 0.5V

A9, V

PP

-0.6V to +13.5V

V

CC

-0.6V to +7.0V

OPERATING RANGES

Commercial (C)

Case Temperature(Tc) 0àC to +70àC

Industrial (I)

Case Temperature(Tc) -40àC to +85àC

Supply READ Voltages

+4.50V to +5.5V

(Functionality is guaranteed between these limits)

Stresses above those shown above may cause permanent damage to the device. This is a stress rating only and
operation above these specifications for extended periods may affect device reliability. Operation outside the

"OPERATING RANGES" shown above voids any and all warranty provisions.

DC CHARACTERISTICS FOR READ OPERATION

Symbol Parameter Min. Max. Unit Conditions

V

OH

Output High Voltage 2.4 V IOH = -0.4mA

V

OL

Output Low Voltage 0.45 V IOL = 2.1mA

V

IH

Input High Voltage 2.0

V

CC

+0.5

V

V

IL

Input Low Voltage -0.3 0.8 V

I

LI

Input Leakage Current -5 5 µAVIN = 0 to 5.5V

I

LO

Output Leakage Current -10 10 µAV

OUT

= 0 to 5.5V

I

CC3

VCC Power -Down Current 10 µA CE= VCC ± 0.3V

I

CC2

VCC Standby Current 1.0 mA CE= V

IH

I

CC1

VCC Active Current 30 mA CE= VIL, f=5MHz,

I

OUT

= 0mA

I

PP

VPP Supply Current Read 100 µA CE= OE = VIL,

VPP = 5.5V

CAPACITANCE

Symbol Parameter Typ. Max. Unit Conditions

C

IN

Input Capacitance 8 12 pF VIN = 0V

C

OUT

Output Capacitance 8 12 pF V

OUT

= 0V

C

VPP

VPP Capacitance 18 25 pF VPP = 0V

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

9

AC CHARACTERISTICS FOR READ OPERATION

EN27C512

-45 -55 -70 -90

Symbol Parameter Condition Min Max Min Max Min Max Min Max Unit

tACC (3) Address to

Output Delay

CE= OE = V

IL

45 55 70 90

ns

tCE (2) CEto Output

Delay

OE = V

IL

45 55 70 90

ns

tOE (2, 3) OE to Output

Delay

OE = V

IL

25 25 30 35

ns

tDF (4, 5) OE or CEHigh to Output Float,

whichever occurred first

20 20 25 25

ns

tOH Output Hold from Address,

CEor OE , whichever occurred

first

0000

ns

FIGURE 6. AC WAVEFORMS FOR READ OPERATION

CE

ADDRESS ADDRESS VALID

OE

OUTPUT

OUTPUT

VALID

tCE

tACC

HIGH Z

tOE

tDF

tOH

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

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FIGURE 7. OUTPUT TEST WAVEFORMS AND MEASUREMENTS

AC

DRIVING

LEVELS

AC
MEASUREMENT
LEVEL

3.0V

1.5V

0.0V

tR, tF < 5 ns (10% to 90%)

AC

DRIVING

LEVELS

AC
MEASUREMENT
LEVEL

OUTPUT

PIN

Note: CL = 100pF including
jig capacitance, except for the

-45 and -55 devices, where
CL = 30pF.

1.3V

(1N914)

3.3K

CL

2.4V

0.8

2.0

0.45V

tR, tF < 20 ns (10% to 90%)

45 and 55 devices:

Output Test Load

70 and 90 devices:

DC PROGRAMMING CHARACTERISTICS

Test Limits

Symbol Parameter Conditions Min. Max Units

I

LI

Input Load Current V

IN = VIL

, V

IH

5.0

µA

V

IL

Input Low Level -0.5 0.8 V

V

IH

Input High Level 0.7 V

CC

V

CC

+ 0.5 V

V

OL

Output Low Voltage I

OL =

2.1 mA 0.45 V

V

OH

Output High Voltage

I

OH =

-400 µA

2.4 V

I

CC2

VCC Supply Current
(Program and Verify)

40 mA

I

PP2

V

PP

Supply Current CE= PGM= V

IL,

10 mA

V

ID

A9 Product Identification Voltage 11.5 12.5 V

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

11

FIGURE 8. PROGRAMMING WAVEFORMS

EN27C512

4800 Great America Parkway Ste 202 Tel: [phone]
Santa Clara, CA. 95054 Fax: [phone]

12

SWITCHING PROGRAMMING CHARACTERISTICS
(TA = + 25° C ± 5°C)

PARAMETER
SYMBOL
STANDARD PARAMETER DESCRIPTION

Min. Max Units

t

AS

Address Setup Time 2

µs

t

OES

OE

/V

PP

Setup Time 2 µs

t

OEH

OE /VPP Hold Time 2 µs

t

DS

Data Setup Time 2 µs

t

AH

Address Hold Time 0 µs

t

DH

Data Hold Time 2 µs

t

DFP

Output Enable to Output Float Delay 0 130 ns

t

PW

PGMProgram Pulse Width 20 105

µs

t

VCS

V

cc

Setup Time 2

µs

t

DV

Data Valid from

CE

150

ns

t

VR OE

/V

PP

Hold Time 2

µs

ORDERING INFORMATION

EN27C512 45 P I

TEMPERATURE RANGE

(Blank) = Commercial ( 0àC to +70àC)
I = Industrial ( -40àC to +85àC)

PACKAGE

P = 28 Plastic DIP
J = 32 Plastic PLCC
T = 28 Plastic TSOP

SPEED

45 = 45ns
55 = 55ns
70 = 70ns
90 = 90ns

BASE PART NUMBER

EN = EON Silicon Devices
27 = EPROM
C = CMOS
512 = 64K x 8