A27020-55 Ver la hoja de datos (PDF) - AMIC Technology

Número de pieza

componentes Descripción

Lista de partido

A27020-55

256K X 8 OTP CMOS EPROM

AMIC Technology 

A27020 Series

Functional Description

Read Mode

The A27020 has two control functions, both of which must

be logically active in order to obtain data at the outputs.

CE is the power control and should be used for device

selection. OE is the output control and should be used to

data to the output pins, which is independent of device

selection. Assuming that addresses are stable, address

access time (tAA) is equal to the delay from CE to output

(tCE). Data is available at the output after a delay (tOE) from

the falling edge of OE , as long as CE has been low and

the addresses have been stable for at least tACC - tOE.

Standby Mode

The A27020 has a standby mode which reduces the

active current from 30mA to 100µA. The A27020 is placed

in the standby mode by applying a CMOS high signal to

CE . When in the standby mode, the output are in a high

impedance state, independent of the OE .

The auto identify mode allows the reading out of a binary

code from a 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.

To activate the mode, the programming equipment must

apply 12.0V ± 0.5V on address line A9 of the A27020.

Three identification code can be read from data output pin

by toggling A0 and A1. The other addresses must be held

at VIL during this mode. Byte 0 (with A0 at VIL, A1 at VIL)

represents the manufacturer code which is 37H. Byte 1

and Byte 2 represent the device code and continuation

code, which is 64H and 7FH respectively. All identifiers for

these codes will possess odd parity, with MSB (IO7)

defined the parity bit.

Auto Identify Mode

Absolute Maximum Ratings*

*Comments

Ambient Operating Temperature (TA) . . . . -10°C to +85°C

Storage Temperature Plastic Package (TSTG) . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to 125°C

Applied Input Voltage (VI):

All Pins Except A9, VPP and VCC . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to VCC + 0.6V

A9, VPP . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to 13.5V

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to 7.0V

Output Voltage (VO) . . . . . . . . . . . . -0.6V to 7.0V (Note 1)

Stresses above those listed under "Absolute Maximum

Ratings" may cause permanent damage to this device.

These are stress ratings only. Functional operation of this

device at these or any other conditions above those

indicated in the operational sections of this specification

is not implied or intended. Exposure to the absolute

maximum rating conditions for extended periods may

affect device reliability.

Notes:

1. During voltage transitions, the input may undershoot GND to -2.0V for periods less than 20 ns. Maximum DC voltage on

input and I/O may overshoot to VCC + 2.0V for periods less than 20 ns.

2. When transitions, A9 and VPP may undershoot GND to -2.0V for periods less than 20 ns. Maximum DC input voltage

on A9 and VPP is +13.5V which may overshoot to 14.0V for period less than 20 ns.

PRELIMINARY (August, 2002, Version 0.0)

3

AMIC Technology, Inc.

Share Link: