ATMEL AT27C256R-90TI, AT27C256R-90TC, AT27C256R-90RI, AT27C256R-70PC, AT27C256R-70JI Datasheet

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ATMEL AT27C256R-90TI, AT27C256R-90TC, AT27C256R-90RI, AT27C256R-70PC, AT27C256R-70JI Datasheet

AT27C256R

Features

Fast Read Access Time - 45 ns

Low Power CMOS Operation

100 μA max. Standby

JEDEC Standard Packages 28-Lead 600-mil PDIP 32-Lead PLCC

28-Lead TSOP and SOIC

5V ± 10% Supply

High Reliability CMOS Technology 2,000V ESD Protection

200 mA Latchup Immunity

RapidProgramming Algorithm - 100 μs/byte (typical)

CMOS and TTL Compatible Inputs and Outputs

Integrated Product Identification Code

Commercial and Industrial Temperature Ranges20 mA max. Active at 5 MHz

Description

The AT27C256R is a low-power, high performance 262,144 bit one-time programmable read only memory (OTP EPROM) organized 32K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45 ns, eliminating the need for speed reducing WAIT states on high performance microprocessor systems.

Atmel’s scaled CMOS technology provides low active power consumption, and fast programming. Power consumption is typically only 8 mA in Active Mode and less than 10 μA in Standby.

(continued)

Pin Configurations

PDIP, SOIC Top View

Pin Name

Function

 

 

 

 

 

 

 

 

 

A0 - A14

Addresses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O0 - O7

Outputs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CE

Chip Enable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OE

Output Enable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

No Connect

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLCC Top View

TSOP Top View

Type 1

Note: PLCC Package Pins 1 and 17 are DON’T CONNECT.

256K (32K x 8) OTP

CMOS

EPROM

AT27C256R

0014G

3-125

Description (Continued)

The AT27C256R is available in a choice of industry standard JEDEC-approved one time programmable (OTP) plastic DIP, PLCC, SOIC, and TSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention.

With 32K byte storage capability, the AT27C256R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.

Atmel’s 27C256R has additional features to ensure high quality and efficient production use. The RapidProgramming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 μs/byte. The Integrated Product Identification Code electronically identifies the device and manufacturer. This feature is used by industry standard programming equipment to select the proper programming algorithms and voltages.

System Considerations

Switching between active and standby conditions via the Chip Enable pin may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device non-conformance. At a minimum, a 0.1 μF high frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the VCC and Ground terminals of the device, as close to the device as possible. Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7 μF bulk electrolytic capacitor should be utilized, again connected between the VCC and Ground terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array.

3-126 AT27C256R

AT27C256R

Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Absolute Maximum Ratings*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature Under Bias

-55°C to +125°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Storage Temperature

-65°C to +150°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage on Any Pin with

-2.0V to +7.0V (1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Respect to Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage on A9 with

- 2.0V to +14.0V (1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Respect to Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VPP Supply Voltage with

- 2.0V to +14.0V (1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Respect to Ground.......................

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Note: 1. Minimum voltage is -0.6V dc which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is VCC + 0.75V dc which may overshoot to +7.0V for pulses of less than 20 ns.

Operating Modes

 

 

 

 

 

 

 

 

 

 

Mode \ Pin

CE

OE

 

 

Ai

VPP

Outputs

Read

VIL

VIL

 

 

Ai

VCC

DOUT

Output Disable

VIL

VIH

 

 

X (1)

VCC

High Z

Standby

VIH

X (1)

 

 

X (1)

VCC

High Z

Rapid Program (2)

VIL

VIH

 

 

Ai

VPP

DIN

PGM Verify (2)

X (1)

VIL

 

 

Ai

VPP

DOUT

Optional PGM Verify (2)

VIL

VIL

 

 

Ai

VCC

DOUT

PGM Inhibit (2)

VIH

VIH

 

 

X (1)

VPP

High Z

Product Identification (4)

 

 

 

 

 

 

A9 = VH (3)

 

Identification

VIL

VIL

 

 

A0 = VIH or VIL

VCC

 

 

Code

 

 

 

 

 

 

 

A1 - A14 = VIL

 

 

 

 

 

 

 

 

 

 

Notes: 1. X can be VIL or VIH.

 

 

 

 

4. Two identifier bytes may be selected. All Ai inputs

2. Refer to Programming characteristics.

 

 

 

 

are held low (VIL), except A9 which is set to VH and A0

3. VH = 12.0 ± 0.5V.

 

 

 

 

 

 

which is toggled low (VIL) to select the Manufacturer’s Identi-

 

 

 

 

 

 

 

fication byte and high (VIH) to select the Device Code byte.

 

 

 

 

 

 

 

 

 

3-127

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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