AT27BV256-70RC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT27BV256-70RC

256K (32K x 8) Unregulated Battery-Voltage™ High Speed OTP CMOS EPROM

Atmel Corporation 

AC Programming Characteristics

TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V

Sym-

Test

bol Parameter Conditions* (1)

tAS

Address Setup

Time

tOES OE Setup Time

tDS Data Setup Time

tAH Address Hold Time

tDH

tDFP

Data Hold Time

OE High to Out-

put Float Delay (2)

tVPS VPP Setup Time

tVCS

tPW

tOE

tPRT

VCC Setup Time

CE Program Pulse

Width (3)

Data Valid

from OE (2)

VPP Pulse Rise Time During

Programming

Limits

Min Max Units

2

µs

2

µs

2

µs

0

µs

2

µs

0 130 ns

2

µs

2

µs

95 105 µs

150 ns

50

ns

*AC Conditions of Test:

Input Rise and Fall Times (10% to 90%)...........20 ns

Input Pulse Levels................................0.45V to 2.4V

Input Timing Reference Level................0.8V to 2.0V

Output Timing Reference Level.............0.8V to 2.0V

Notes: 1. VCC must be applied simultaneously or before VPP

and removed simultaneously or after VPP.

2. This parameter is only sampled and is not 100%

tested. Output Float is defined as the point where

data is no longer driven —see timing diagram.

3. Program Pulse width tolerance is 100 µsec ± 5%.

Rapid Programming Algorithm

A 100 µs CE pulse width is used to program. The address

is set to the first location. VCC is raised to 6.5V and VPP is

raised to 13.0V. Each address is first programmed with

one 100 µs CE pulse without verification. Then a verifica-

tion / reprogramming loop is executed for each address.

In the event a byte fails to pass verification, up to 10 suc-

cessive 100 µs pulses are applied with a verification after

each pulse. If the byte fails to verify after 10 pulses have

been applied, the part is considered failed. After the byte

verifies properly, the next address is selected until all have

been checked. VPP is then lowered to 5.0V and VCC to

5.0V. All bytes are read again and compared with the

original data to determine if the device passes or fails.

Atmel’s 27BV256 Integrated

Product Identification Code (1)

Codes

Pins

Hex

A0 O7 O6 O5 O4 O3 O2 O1 O0 Data

Manufacturer 0 0 0 0 1 1 1 1 0 1E

Device Type 1 1 0 0 0 1 1 0 0 8C

Note: 1. The AT27BV256 has the same Product Identification

Code as the AT27C256R. Both are programming

compatible.

3-10

AT27BV256

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