AT27C1024

2

In read mode, the AT27C1024 typically consumes 15 mA.

Standby mode supply current is typically less than 10

µA.

The AT27C1024 is available in industry standard JEDEC-

approved one-time programmable (OTP) plastic PDIP,

PLCC, and TSOP packages. The device features two-line

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

systems.

With high density 64K word storage capability, the

AT27C1024 allows firmware to be stored reliably and to be

accessed by the system without the delays of mass storage

media.

Atmel’s 27C1024 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/word. 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 tran-

sients 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 uti-

lized for each device. This capacitor should be connected

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

terminals. This capacitor should be positioned as close as

possible to the point where the power supply is connected

to the array.