Atmel’s innovative design techniques provide fast speeds
that rival 5V parts while keeping the low power consump-
tion of a 3V supply. At V
CC
= 2.7V, any word can be ac-
cessed in less than 120 ns. With a typical power dissipa-
tion of only 18 mW at 5 MHz and V
CC
= 3V, the
AT27BV1024 consumes less than one fifth the power of a
standard 5V EPROM.
Standby mode supply current is typically less than 1 µA at
3V. The AT27BV1024 simplifies system design and
stretches battery lifetime even further by eliminating the
need for power supply regulation.
The AT27BV1024 is available in industry standard
JEDEC-approved one-time programmable (OTP) plastic
PLCC and TSOP packages. All devices feature two-line
control (
CE, OE) to give designers the flexibility to prevent
bus contention.
The AT27BV1024 operating with V
CC
at 3.0V produces
TTL level outputs that are compatible with standard TTL
logic devices operating at V
CC
= 5.0V. At V
CC
= 2.7V, the
part is compatible with JEDEC approved low voltage bat-
tery operation (LVBO) interface specifications. The device
is also capable of standard 5-volt operation making it ide-
ally suited for dual supply range systems or card products
that are pluggable in both 3-volt and 5-volt hosts.
Atmel’s AT27BV1024 has additional features to ensure
high quality and efficient production use. The Rapid
Pro-
gramming Algorithm reduces the time required to program
the part and guarantees reliable programming. Program-
ming time is typically only 100 µs/word. 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 AT27BV1024
programs exactly the same way as a standard 5V
AT27C1024 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
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 posi-
tioned as close as possible to the point where the power
supply is connected to the array.
System Considerations
3-34 AT27BV1024
