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AT27C040

0189F–EPROM–4/03

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

Considerations

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 V

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 V

close as possible to the point where the power supply is connected to the array.

Block Diagram