Holtek Semiconductor Inc HT27C020 Datasheet

OTP CMOS 256K×8-Bit EPROM

Features

•

Operating voltage: +5.0V

•

Programming voltage

–

VPP=12.5V±0.2V

–

VCC=6.0V±0.2V

•

High-reliability CMOS technology

•

Latch-up immunity to 100mA from -1.0V to
V

+1.0V

CC

•

CMOS and TTL compatible I/O

•

Low power consumption

–

Active: 30mA max.

–

Standby: 1µA typ.

•

256K×8-bit orga nization

General Description

The HT27C020 chip family is a low-power,
2048K (2,097,152) bit, +5V electrically one-time
programmable (OTP) read-only memories
(EPROM). Organized in to 256K words with 8
bits per word, it fea tures a fast single addres s
location programming, typically at 75
byte. Any byte can be accessed in less than

µs per

HT27C020

•

Fast read access time: -70ns, -90ns
and -120ns

•

Fast programming algorithm

•

Programming time 75µs typ.

•

Two line controls (OE and CE)

•

Standard product identification code

•

Package type

–

32-pin DIP/SOP

–

32-pin PLCC

•

Commercial temperature range
(0

°C to +70°C)

70ns/90ns/120ns with respect to Spec. This
eliminates the need for WAIT states in high­performance microprocessor systems. The
HT27C020 has separate Output Enable (
and Chip Enable (

CE) controls which eliminate

bus contention issues.

OE)

Block Diagram

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Pin Assignment

Pin Description

HT27C020

Pin Name I/O/C/P Description

A0~A17 I Address inputs
DQ0~DQ7 I/O Data inputs/outputs
CE C Chip enable
OE C Output enable
PGM C Program strobe
NC — No connection
VPP P Program voltage supply
VCC I Positive power supply
VSS I Negative power supply

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HT27C020

Absolute Maximum Rating

Operation Temperature Commercial ............................................................................ ......0°C to +70°C

Storage Temperature................................ .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ....–65

Applied VCC V olt age with Respect to VSS..................... ............ .. ............ ............ ............ –0.6V to 7.0V

Applied Voltage on Input Pin with Respect to VSS.......................................................... –0.6V to 7.0V

Applied Voltage on Output Pin with Respect to VSS.............................................. –0.6V to V

Applied Voltage on A9 Pin with Respect to VSS .......................................... .... .. .. .... .. .. .. –0.6V to 13.5V

Applied VPP Voltage with Respect to VSS ............................... .... .... .... .... .... .... .... .... .... ...–0.6V to 13.5V

Applied READ Voltage (Functionality is guaranteed between these limits) ...............+4.5V to +5.5V

Note: These are stres s ratings only. Stresses exceeding the range specified under “Absolute Maxi-

mum Ratings” 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 condition s may affect device reliability.

D.C. Characteristics

Read operation

Symbol Parameter

V
V
V
V
I

LI

I

LO

I

CC

I

SB1

I

SB2

I

PP

Output High Level 5V IOH=–0.4mA 2.4 — — V

OH

Output Low Level 5V IOL=2.1mA — — 0.45 V

OL

Input High Level 5V — 2.0 — VCC+0.5 V

IH

Input Low Level 5V — –0.3 — 0.8 V

IL

Input Leakage Current 5V VIN=0 to 5.5V –5 — 5
Output Leakage Current 5V V

VCC Active Current 5V
Standby Current (CMOS) 5V

Standby Current (TTL) 5V CE=V
VPP Read/Standby Current 5V CE=OE=VIL, VPP=V

Test Conditions

V

CC

OUT

CE=VIL, f=5MHz,
I

OUT

CE=V

Conditions

Min. Typ. Max. Unit

=0 to 5.5V –10 — 10

=0mA

±0.3V

CC
IH

—— 30 mA
— 1.0 10

— — 1.0 mA
—— 100

CC

°C to 125°C

+0.5V

CC

µA
µA

µA

µA

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Programming operation

Symbol Parameter

V

OH

V

OL

V

IH

V

IL

I

LI

V

H

I

CC

I

PP

Output High Level 6V IOH=–0.4mA 2.4 — — V
Output Low Level 6V IOL=2.1mA — — 0.45 V
Input High Level 6V — 0.7V
Input Low Level 6V — –0. 5 — 0.8 V
Input Load Current 6V VIN=VIL, V
A9 Product ID Voltage 6V — 11.5 — 12.5 V
VCC Supply Current 6V — — — 40 mA
VPP Supply Current 6V CE=V

Capacitance

Symbol Parameter

C
C
C

IN
OUT
VPP

Input Capacitance 5V VIN=0V — 8 12 pF
Output Capacitance 5V V
VPP Capacitance 5V VPP=0V — 18 25 pF

Test Conditions

V

CC

Conditions

IL

Test Conditions

V

CC

HT27C020

Min. Typ. Max. Unit

—VCC+0.5 V

CC

IH

Conditions

=0V — 8 12 pF

OUT

— — 5.0

——10mA

Min. Typ. Max. Unit

µA

A.C. Characteristics

Read operation

Symbol Parameter

t
t

t

t

t

Address to Output Delay 5V CE=OE=VIL— 70 — 90 — 120 ns

ACC

Chip Enable to Output

CE

Delay
Output Enable to Output

OE

Delay
CE or OE High to Output

Float, Whichever

DF

Occurred First
Output Hold from

OH

Address,

CE or OE,

Whichever Occurred First

Test Conditions –70 –90 –120

Unit

VCCConditions Min. Max. Min. Max. Min. Max.

5V

5V

OE=V

CE=V

IL

IL

— 70 — 90 — 120 ns

—30—35—40ns

5V — — 25 — 25 — 30 ns

5V — 0—0—0—ns

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