ATMEL AT27BV020-90VI, AT27BV020-90VC, AT27BV020-90TI, AT27BV020-90TC, AT27BV020-90JI Datasheet
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Features
•
Fast Read Access Time - 90 ns
•
Dual Voltage Range Operation
– Unregulated Battery Power Supply Range, 2.7V to 3.6V
or Standard 5V ± 10% Supply Range
•
Compatible with JEDEC Standard AT27C020
•
Low Power CMOS Operation
–20 µA max. (less than 1 µA typical) Standby for VCC = 3.6V
– 29 mW max. Active at 5 MHz for VCC = 3.6V
•
Wide Selection of JEDEC Standard Packages
– 32-Lead PLCC
– 32-Lead TSOP (8 x 20mm)
– 32-Lead VSOP (8 x 14mm)
– 42-Ball CBGA (8 x 8mm)
•
High Reliability CMOS Technology
– 2,000V ESD Protection
– 200 mA Latchup Immunity
•
Rapid™ Programming Algorithm - 100 µs/byte (typical)
•
CMOS and TTL Compatible Inputs and Outputs
– JEDEC Standard for LVTTL and LVBO
•
Integrated Product Identification Code
•
Commercial and Industrial Temperature Ranges
AT27BV020
2-Megabit
(256K x 8)
Unregulated
Battery-Voltage™
High Speed
Description
The AT27BV020 is a high-performance, low-power, low-voltage 2,097,152-bit onetime programmable read only memory (OTP EPROM) organized as 256K by 8 bits. It
requires only one supply in the range of 2.7 to 3.6V in normal read mode operation,
making it ideal for fast, portable systems using either regulated or unregulated battery
power.
Pin Configurations
Pin Name Function
A0 - A17 Address
O0 - O7 Outputs
CE
OE
PGM
PLCC, Top View
Chip Enable
Output Enable
Program Strobe
CBGA Top View
234567
1
A
GND
O6
VCC
VCC
B
A17
O7
C
A10
D
A14
E
A16
F
A15
NC
A13
A11
A12
O4
O5
A9
PGM
A8
NC
NC
NC
NC
NC
O2
NC
O3
NC
A7
VPP
TSOP, VSOP Top View
Type 1
(continued)
OE
GND
O0
CE
O1
A0
A6
A3
A4
A1
A5
A2
OTP EPROM
AT27BV020
0902A-A–10/97
1
Atmel’s innovativ e design techniques provide fas t speeds
that rival 5V parts while keep ing th e low pow er consum ption of a 3V supply. At V
= 2.7V, any byte can be
CC
accessed in less than 90 ns. With a typical power dissipation of only 18 mW at 5 MHz and V
= 3V, the AT27BV020
CC
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 AT27BV020 simplifies system design and
stretches battery li fetime even further by eliminating the
need for power supply regulation
The AT27BV020 is available in industry standard JEDEC
approved one-time programmable (OTP) plastic PLCC,
TSOP and VSOP packages, as well as a 42-ball, 1 mm
pitch, plastic chip-scale Ball Grid Array package (CBGA).
All devices feature two-line control (CE
, OE) to give design-
ers the flexibility to prevent bus contention.
The AT27BV020 op eratin g with V
at 3.0V produces TTL
CC
level outputs that are compatible with standard TTL logic
devices operat ing at V
= 5.0V. At VCC = 2.7V, the part is
CC
compatible with JEDEC approved low voltage battery operation (LVBO) interface specifications . The device is also
capable of standard 5-volt operation making it ideally suited
for dual supply range systems or card products that are
pluggable in both 3-volt and 5-volt hosts.
Atmel's AT27B V020 has addi tional fe atures to e nsure high
quality and efficient production use. The Rapid
™
Program-
ming Algori thm reduc es the ti me requi red to pro gram the
part and guarantees reliable programming. Programming
time is typically only 100 µs/byte. The Inte grated Produc t
Identification Code electronically identi fies the device and
manufacturer. This feature is used by industry standard
programming equipment to select the proper programming
algorithms and voltages. The AT27BV020 programs
exactly the same way as a standard 5V AT27C020 and
uses the same programming equipment.
System Considerations
Switching between active and standby conditions via the
Chip Enable pin may prod uce tr ans ie nt v olt age excur sions.
Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device
non-conformance. At a minimum, a 0.1 µF high frequ enc y,
low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor shoul d be connected
between the V
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
terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.
and Ground terminals of the device, as
CC
and Ground
CC
2
AT27BV020
Block Diagram
Absolute Maximum Ratings*
Temperature Under Bias.................................. -40°C to +85°C
Storage Temperature..................................... -65°C to +125°C
Voltage on Any Pin with
Respect to Ground .........................................-2.0V to +7.0V
Voltage on A9 with
Respect to Ground ......................................-2.0V to +14.0V
VPP Supply Voltage with
Respect to Ground .......................................-2.0V to +14.0V
AT27BV020
*NOTICE: Stresses beyond those listed und er “Absolute M axi-
mum Ratings” ma y cause permanent damage to th e
device. This is a stress rating only and functional
operation of the device at these or any other condi-
(1)
(1)
Note: Minimum voltage is -0.6V DC which may undershoot to -
(1)
tions beyond those indicated in the operational sections of this specific ation is not implie d. Exposure to
absolute maximum rating conditions for extended
periods may affect device reliability.
2.0V for pulses of less than 20 ns.Maximum output pin
voltage is V
+ 0.75V DC which may be exceeded if cer-
CC
tain precautions are obs erved (consult application not es)
and which ma y ov ershoot to +7.0V f or pulse s of less than
20 ns.
Operating Modes
Mode / Pin CE OE PGM Ai V
(2)
Read
Output Disable
Standby
Rapid Program
PGM Verify
PGM Inhibit
Product Identification
(2)
(2)
(3)
(3)
(3)
(3)(5)
Notes: 1. X Can be VIL or VIH.
2. Read, output disable, and standby modes requir e, 2.7V ≤ V
3. Refer to Programming Characteristics. Programming modes requires VCC = 6.5V.
= 12.0 ± 0.5V.
4. V
H
5. Two identifier bytes may be selected. All Ai inputs are held low (VIL), except A9 which is set to VH and A0 which is toggl ed low
) to select the Manufacturer’s Identification byte and high (VIH) to select the Devi ce Code byte.
(V
IL
V
IL
X V
V
IH
V
IL
V
IL
V
IH
V
IL
V
IL
IH
XX X XV
V
IH
V
IL
XX X VPPV
V
IL
(1)
X
Ai X V
XXXV
V
IL
V
IH
X
Ai V
Ai V
A9 = V
A0 = VIH or V
A1 - A17 = V
≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.
CC
(4)
H
IL
IL
PP
PP
PP
XV
V
CC
(2)
CC
(2)
CC
(2)
CC
(3)
V
CC
(3)
V
CC
(3)
CC
(3)
CC
Outputs
D
OUT
High Z
High Z
D
IN
D
OUT
High Z
Identification
Code
3
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