AT27LV520-90 ATMEL Corporation, AT27LV520-90 Datasheet - Page 2

• Manufacturer Part Number: AT27LV520-90
• Description: 512K 64K x 8 Multiplexed Addresses/ Outputs Low Voltage OTP EPROM
• Manufacturer: ATMEL Corporation

Atmel’s innovative design techniques provide fast speeds
that rival 5V parts while keeping the low power consump-
tion of a 3.3V supply. At V
accessed in less than 90 ns. With a typical power dissipa-
tion of only 18 mW at 5 MHz and V
AT27LV520 consumes less than one fifth the power of a
standard 5V EPROM. Standby mode is acheived by assert-
ing ALE high. Standby mode supply current is typically less
than 1 A at 3.3V.
The AT27LV520 operating with V
level outputs that are compatible with standard TTL logic
devices operating at V
ble of standard 5-volt operation making it ideally suited for
dual supply range systems or card products that are plug-
gable in both 3-volt and 5-volt hosts.
Atmel’s AT27LV520 has additional features to ensure high
quality and efficient production use. The Rapid
ming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programing
time is typically only 50 s/byte. The Integrated Product
Identification Code electronically identifies the device and
Block Diagram
2
CC
AT27LV520
= 5.0V. The device is also capa-
CC
AD7 - AD0
A15 - A8
OE/VPP
= 3.0V, any byte can be
CC
GND
ALE
V
CC
at 3.0V produces TTL
C C
= 3.3V, the
™
8
PROGRAM LOGIC
OE, ALE, AND
Program-
Y DECODER
X DECODER
manufacturer. This feature is used by industry standard
programming equipment to select the proper programming
algorithms and voltages. The AT27LV520 programs exactly
the same way as a standard 5V AT27C520 and uses the
same programming equipment.
System Considerations
Switching under active conditions may produce transient
voltage excursions. Unless accommodated by the system
design, these transients may exceed data sheet limits,
resulting in device non-conformance. At a minimum, a 0.1
capacitor should be utilized for each device. This capacitor
should be connected between the V
nals of the device, as close to the device as possible. Addi-
tionally, to stabilize the supply voltage level on printed cir-
cuit boards with large EPROM arrays, a 4.7 F bulk elec-
trolytic capacitor should be utilized, again connected
between the V
should be positioned as close as possible to the point
where the power supply is connected to the array.
F high frequency, low inherent inductance, ceramic
IDENTIFICATION
CELL MATRIX
Y-GATING
BUFFERS
OUTPUT
CC
and Ground terminals. This capacitor
8
CC
and Ground termi-