AT27C800-12JC Atmel, AT27C800-12JC Datasheet - Page 2

• Manufacturer Part Number: AT27C800-12JC
• Description: IC OTP 8MBIT 120NS 44PLCC
• Manufacturer: Atmel

Specifications of AT27C800-12JC

• Format - Memory: EPROMs
• Memory Type: OTP EPROM
• Memory Size: 8M (1M x 8 or 512K x 16)
• Speed: 120ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

8 bits. It requires a single 5V power supply in normal read
mode operation. Any word can be accessed in less than
100 ns, eliminating the need for speed-reducing WAIT
states. The x16 organization makes this part ideal for high-
performance 16- and 32-bit microprocessor systems.
The AT27C800 can be organized as either word-wide or
byte-wide. The organization is selected via the BYTE/V
pin. When BYTE/V
organization is selected and the O15/A-1 pin is used for
O15 data output. When BYTE/V
byte-wide organization is selected and the O15/A-1 pin is
used for the address pin A-1. When the AT27C800 is logi-
cally regarded as x16 (word-wide), but read in the byte-
wide mode, then with A-1 = V
16-bit word are selected; with A-1 = V
of the 16-bit word are selected.
In read mode, the AT27C800 typically consumes 15 mA.
Standby mode supply current is typically less than 10 µA .
The AT27C800 is available in industry-standard, JEDEC-
approved, one-time programmable (OTP) PLCC, PDIP,
SOIC (SOP) and TSOP, as well as UV-erasable windowed
Cerdip packages. The device features two-line control
(CE,OE) to eliminate bus contention in high-speed
systems.
With high-density 512K-word or 1024K-bit storage capabil-
ity, the AT27C800 allows firmware to be stored reliably and
to be accessed by the system without the delays of mass
storage media.
Block Diagram
2
PP
is asserted high (V
AT27C800
IL
PP
the lower eight bits of the
is asserted low (V
IH
the upper eight bits
IH
), the word-wide
IL
), the
PP
Atmel’s AT27C800 has additional features that ensure high
quality and efficient production use. The Rapid
ming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programming
time is typically only 50 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
equipment 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 uti-
lized for each device. This capacitor should 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.
CC
and Ground terminals of the device, as
CC
and Ground
™
Program-