AT27C020
2
In read mode, the AT27C020 typically consumes 8 mA.
Standby mode supply current is typically less than 10 µA.
The AT27C020 is available in a choice of industry-standard
JEDEC-approved one-time programmable (OTP) plastic
PDIP, PLCC and TSOP packages. All devices feature two-
line control (CE
, OE) to give designers the flexibility to pre-
vent bus contention.
With 256K bytes storage capability, the AT27C020 allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.
Atmel’s 27C020 have additional features to ensure high
quality and efficient production use. The Rapid
™
Program-
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 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 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
CC
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 V
CC
and Ground
terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.
Block Diagram
