AT27BV400-12JI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

View to exact match

AT27BV400-12JI

4-Megabit (256K x 16 or 512K x 8) Unregulated Battery-Voltage™ High Speed OTP EPROM

Atmel Corporation 

mode operation. The by-16 organization makes this part

ideal for portable and hand held 16- and 32-bit micropro-

cessor systems using either regulated or unregulated bat-

tery power.

Atmel’s innovative design techniques provide fast speeds

that rival 5V parts while keeping the low power consump-

tion of a 3V supply. At VCC = 2.7V, any word can be

accessed in less than 120ns. With a typical power dissipa-

tion of only 10 mW at 5mHZ and VCC = 3V, the AT27BV400

consumes less than one fifth the power of a standard 5V

EPROM.

Standby mode supply current is typically less than 1 mA at

3V. The AT27BV400 simplifies system design and

stretches battery lifetime even further by eliminating the

need for power supply regulation.

The AT27BV400 can be organized as either word-wide or

byte-wide. The organization is selected via the BYTE/VPP

pin. When BYTE/VPP is asserted high (VIH), the word-wide

organization is selected and the O15/A-1 pin is used for

O15 data output. When BYTE/VPP is asserted low (VIL),the

byte wide organization is selected and the O15/A-1 pin is

used for the address pin A-1. When the AT27BV400 is logi-

cally regarded as x16 (word-wide), but read in the byte-

wide mode, then with A-1= VIL the lower 8 bits of the 16-bit

word are selected with A-1 = VIH the upper 8 bits of the 16-

bit word are selected.

The AT27BV400 is available in industry standard JEDEC-

approved one-time programmable (OTP) PLCC, SOIC

(SOP), and TSOP packages. The device features two-line

control(CE,OE) to eliminate bus contention.

With high density 256K word or 512K byte storage capabil-

ity, the AT27BV400 allows firmware to be to be stored reli-

ably and to be accessed by the system without the delays

of mass storage media.

The AT27BV400 operating with VCC at 3.0V produces TTL

level outputs that are compatible with standard TTL logic

devices operating at VCC = 5V. At VCC = 2.7V, the part is

compatible with JEDEC approved low voltage battery oper-

ation (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 AT27BV400 has additional features that ensure

high quality and efficient production use. The RapidTM Pro-

gramming Algorithm reduces the time required to program

the part and guarantees reliable programming. Program-

ming time is typically only 50µs/word. The Integrated Prod-

uct 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. The AT27BV400 programs

exactly the same way as a standard 5V AT27C400 and

uses the same programming equipment.

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 data sheet 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 VCC 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 VCC 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

2

AT27BV400

Share Link: