Standby mode supply current is typically less than 1

µA at

3.3V.

The AT27LV256A is available in industry standard

JEDEC-approved one-time programmable (OTP) plastic

PLCC, SOIC and TSOP packages . All devices feature

two-line control (CE, OE) to give designers the flexibility to

prevent bus contention.

TTL level outputs that are compatible with standard TTL

capable of standard 5-volt operation making it ideally

suited for dual supply range systems or card products that

are pluggable in both 3-volt and 5-volt hosts.

Atmel’s AT27LV256A has additional features to ensure

gramming Algorithm reduces the time required to program

the part and guarantees reliable programming. Program-

ming time is typically only 100

µs/byte. The Integrated

Product Identification Code electronically identifies the de-

vice and manufacturer. This feature is used by industry

standard programming equipment to select the proper

programming algorithms and voltages. The AT27LV256A

programs exactly the same way as a standard 5V

AT27C256R and uses the same programming equipment.

Description (Continued)

Switching between active and standby conditions via the

Chip Enable pin may produce transient voltage excur-

sions. Unless accommodated by the system design, these

transients may exceed data sheet limits, resulting in de-

vice non-conformance. At a minimum, a 0.1

µF high fre-

quency, low inherent inductance, ceramic capacitor

should be utilized for each device. This capacitor should

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

tioned as close as possible to the point where the power

supply is connected to the array.

System Considerations

3-76

AT27LV256A