System Considerations

The AT27C010/L in available in a choice of industry stand-

ard JEDEC-approved one-time programmable (OTP)

plastic PDIP, PLCC, and TSOP packages. All devices fea-

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

ity to prevent bus contention.

With 128K byte storage capability, the AT27C010/L allows

firmware to be stored reliably and to be accessed by the

system without the delays of mass storage media.

Atmel’s 27C010/L have additional features to ensure high

ming 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 program-

ming algorithms and voltages.

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.

3-154

AT27C010/L