AT27LV256A
Features
∙Fast Read Access Time - 70 ns
∙Dual Voltage Range Operation
Low Voltage Power Supply Range, 3.0V to 3.6V
±
∙Pin Compatible with JEDEC Standard AT27C256
∙Low Power CMOS Operationor Standard 5V 10% Supply Range
20 μA max. (less than 1 μA typical) Standby for VCC = 3.6V
∙JEDEC Standard Packages 32-Lead PLCC
28-Lead 330-mil SOIC
28-Lead TSOP
∙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
∙Integrated Product Identification Code
∙Commercial and Industrial Temperature Ranges29 mW max. Active at 5 MHz for VCC = 3.6V
Description
The AT27LV256A is a high performance, low power, low voltage 262,144 bit one-time programmable read only memory (OTP EPROM) organized as 32K by 8 bits. It requires only one supply in the range of 3.0V to 3.6V in normal read mode operation, making it ideal for fast, portable systems using battery power.
Atmel’s innovative design techniques provide fast speeds that rival 5V parts while keeping the low power consumption of a 3.3V supply. At VCC = 3.0V, any byte can be accessed in less than 70 ns. With a typical power dissipation of only 18 mW at 5 MHz and VCC = 3.3V, the AT27LV256A consumes less than one fifth the power of a standard 5V EPROM.
(continued)
Pin Configurations
SOIC Top View
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Pin Name |
Function |
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A0 - A14 |
Addresses |
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O0 - O7 |
Outputs |
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CE |
Chip Enable |
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OE |
Output Enable |
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NC |
No Connect |
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PLCC Top View
TSOP Top View
Type 1
Note:PLCC Package Pins 1 and 17
are DON’T CONNECT.
256K (32K x 8) Low Voltage OTP
CMOS EPROM
AT27LV256A
0547A
3-75
Description (Continued)
Standby mode supply current is typically less than 1 μA at 3.3V.
The AT27LV256A is available in industry standard JEDEC-approved one-time programmable (OTP) plastic PLCC, SOIC and TSOP packages . All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention.
The AT27LV256A operating with VCC at 3.0V produces TTL level outputs that are compatible with standard TTL logic devices operating at VCC = 5.0V. 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 AT27LV256A has additional features to ensure high quality and efficient production use. The Rapid™ Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 μs/byte. 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 algorithms and voltages. The AT27LV256A programs exactly the same way as a standard 5V AT27C256R 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 transients 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 utilized 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.
3-76 AT27LV256A
AT27LV256A
Block Diagram |
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Absolute Maximum Ratings* |
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Temperature Under Bias |
.................. -40°C to +85°C |
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Storage Temperature |
-65°C to +125°C |
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Voltage on Any Pin with |
- 2.0V to +7.0V (1) |
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Respect to Ground |
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Voltage on A9 with |
- 2.0V to +14.0V (1) |
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Respect to Ground |
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VPP Supply Voltage with |
- 2.0V to +14.0V (1) |
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.......................Respect to Ground |
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*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 may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is VCC + 0.75V dc which may be exceeded if certain precautions are observed (consult application notes) and which may overshoot to +7.0 volts for pulses of less than 20 ns.
Operating Modes
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Mode \ Pin |
CE |
OE |
Ai |
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VPP |
VCC |
Outputs |
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Read (2) |
VIL |
VIL |
Ai |
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VCC |
VCC (2) |
DOUT |
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Output Disable (2) |
VIL |
VIH |
X (1) |
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VCC |
VCC (2) |
High Z |
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Standby (2) |
VIH |
X (1) |
X (1) |
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VCC |
VCC (2) |
High Z |
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Rapid Program (3) |
VIL |
VIH |
Ai |
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VPP |
VCC (3) |
DIN |
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PGM Verify (3) |
X (1) |
VIL |
Ai |
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VPP |
VCC (3) |
DOUT |
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Optional PGM Verify (3) |
VIL |
VIL |
Ai |
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VCC |
VCC (3) |
DOUT |
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PGM Inhibit (3) |
VIH |
VIH |
X (1) |
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VPP |
VCC (3) |
High Z |
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Product Identification (3, 5) |
VIL |
VIL |
A9 = VH (4) |
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VCC |
VCC (3) |
Identification |
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A0 = VIH or VIL |
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A1 - A14 = VIL |
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Code |
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Notes: 1. X can be VIL or VIH. |
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4. VH = 12.0 ± 0.5V. |
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2. Read, output disable, and standby modes require, |
5. Two identifier bytes may be selected. All Ai inputs |
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3.0V ≤ VCC ≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V. |
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are held low (VIL), except A9 which is set to VH and A0 |
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3. Refer to Programming Characteristics. Programming |
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which is toggled low (VIL) to select the Manufacturer’s Identi- |
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modes require VCC = 6.5V. |
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fication byte and high (VIH) to select the Device Code byte. |
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3-77 |
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