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A276308L-70

64K X 8 OTP CMOS EPROM

AMIC Technology 

A276308

Functional Description

Read Mode

The A276308 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 tAA - tOE.

Standby Mode

The A276308 has a standby mode which reduces the

active current from 30mA to 100µA. The A276308 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 .

Auto Identify Mode

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 A276308.

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 3DH and 7FH respectively. All identifiers

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

defined the parity bit.

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 (December, 1998, Version 0.1)

3

AMIC Technology, Inc.

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