AT27BV400

Features:

• Fast Read Access Time - 120 ns
• Word-wide or Byte-wide Configurable
• Dual Voltage Range Operation
    Unregulated Battery Power Supply Range, 2.7V to 3.6V or Standard 5V ± 10% Supply Range
• 4-Megabit Flash and Mask ROM Compatable
• Low Power CMOS Operation
    20 A Maximum Standby
    10 mA Max. Active at 5 MHz for V_CC = 3.6V
• JEDEC Standard Packages
    44-Lead PLCC
    44-Lead SOIC (SOP)
    48-Lead TSOP (12 mm x 20 mm)
• High Reliability CMOS Technology
    2,000 ESD Protection
    200 mA Latchup Immunity
• Rapid™ Programming Algorithm - 50 s/word (typical)
• CMOS and TTL Compatible Inputs and Outputs
    JEDEC Standard for LVTTL and LVBO
• Integrated Product Identification Code
• Commercial and Industrial Temperature Ranges


Pinout





Specifications

Temperature Under Bias................................ -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
Voltage on Any Pin with
with Respect to Ground ..................................-2.0V to +7.0V⁽¹⁾
Voltage on A9 with
Respect to Ground ......................................-2.0V to +14.0V⁽¹⁾
VPP Supply Voltage with
Respect to Ground .......................................-2.0V to +14.0V⁽¹⁾
*NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Note: 1. Minimum voltage is -0.6V DC which undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is Vcc + 0.75V DC which may overshoot to + 7.0V for pulses of less than 20 ns.


Description

The AT27BV400 is a high performance low-power, low-voltage 4,194,304-bit one time programmable read only memory (OTP EPROM) organized as either 256K by 16 or 512K by 8 bits. AT27BV400 requires only one supply in the range of 2.7 to 3.6V in normal read mode operation. The by-16 organization makes this part ideal for portable and hand held 16- and 32-bit microprocessor systems using either regulated or unregulated battery power.

Atmel's innovative design techniques provide fast speeds that rival 5V parts while keeping the low power consumption of a 3V supply. At V_CC = 2.7V, any word can be accessed in less than 120ns. With a typical power dissipation of only 10 mW at 5mHZ and V_CC = 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/V_PP pin. When BYTE/V_PP is asserted high (V_IH), the word-wide organization is selected and the O15/A-1 pin is used for O15 data output. When BYTE/V_PP is asserted low (V_IL),the byte wide organization is selected and the O15/A-1 pin is used for the address pin A-1. When the AT27BV400 is logically regarded as x16 (word-wide), but read in the bytewide mode, then with A-1= V_IL the lower 8 bits of the 16-bit word are selected with A-1 = V_IH the upper 8 bits of the 16- bit word are selected.

The AT27BV400 is available in industry standard JEDECapproved 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 capability, the AT27BV400 allows firmware to be to be stored reliably and to be accessed by the system without the delays of mass storage media.

The AT27BV400 operating with V_CC at 3.0V produces TTL level outputs that are compatible with standard TTL logic devices operating at V_CC = 5V. At V_CC = 2.7V, the part is compatible with JEDEC approved low voltage battery operation (LVBO) interface specifications. The device is also capable of standard 5-volt operation making AT27BV400 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 Rapid^TM Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 50ms/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. The AT27BV400 programs exactly the same way as a standard 5V AT27C400 and uses the same programming equipment.