AT27C040-12 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT27C040-12

4-Megabit (512K x 8) OTP EPROM

Atmel Corporation 

Switching

Considerations

Block Diagram

Atmel’s scaled CMOS technology provides low active power consumption, and fast program-

ming. Power consumption is typically 8 mA in active mode and less than 10 µA in standby

mode.

The AT27C040 is available in a choice of industry standard JEDEC-approved one-time pro-

grammable (OTP) plastic PDIP, PLCC and TSOP packages. The device features two-line

control (CE, OE) to eliminate bus contention in high-speed systems.

Atmel’s AT27C040 has additional features to ensure high quality and efficient production use.

The Rapid Programming Algorithm reduces the time required to program the part and guaran-

tees 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 algo-

rithms and voltages.

Switching between active and standby conditions via the Chip Enable pin may produce tran-

sient voltage excursions. Unless accommodated by the system design, these transients may

exceed datasheet 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.

2 AT27C040

0189F–EPROM–4/03

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