AT27C512R
Features
∙Fast Read Access Time - 45 ns
∙Low Power CMOS Operation
100 μA max. Standby
∙JEDEC Standard Packages 28-Lead 600-mil PDIP 32-Lead PLCC
28-Lead TSOP and SOIC
∙5V ± 10% Supply
∙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
∙Integrated Product Identification Code
∙Commercial and Industrial Temperature Ranges20 mA max. Active at 5 MHz
Description
The AT27C512R is a low-power, high performance 524,288 bit one-time programmable read only memory (OTP EPROM) organized 64K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45 ns, eliminating the need for speed reducing WAIT states on high performance microprocessor systems.
Atmel’s scaled CMOS technology provides high speed, lower active power consumption, and significantly faster programming. Power consumption is typically only 8 mA in Active Mode and less than 10 μA in Standby.
(continued)
Pin Configurations
PDIP, SOIC Top View
Pin Name Function
A0 - A15 Addresses
O0 - O7 Outputs
CE |
Chip Enable |
OE /VPP Output Enable/VPP
NC |
No Connect |
PLCC Top View
TSOP Top View
Type 1
Note: PLCC Package Pins 1 and 17 are DON’T CONNECT.
512K (64K x 8) OTP
CMOS
EPROM
AT27C512R
0015H
3-135
Description (Continued)
The AT27C512R is available in a choice of industry standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, SOIC, and TSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention.
With 64K byte storage capability, the AT27C512R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.
Atmel’s 27C512R 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.
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.
3-136 AT27C512R
AT27C512R
Block Diagram |
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Absolute Maximum Ratings* |
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Temperature Under Bias |
-55°C to +125°C |
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Storage Temperature |
-65°C to +150°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 overshoot to +7.0V for pulses of less than 20 ns.
Operating Modes
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Mode \ Pin |
CE |
OE/VPP |
Ai |
Outputs |
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Read |
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VIL |
VIL |
Ai |
DOUT |
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Output Disable |
VIL |
VIH |
X (1) |
High Z |
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Standby |
VIH |
X (1) |
X |
High Z |
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Rapid Program (2) |
VIL |
VPP |
Ai |
DIN |
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PGM Inhibit |
VIH |
VPP |
X (1) |
High Z |
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Product Identification (4) |
VIL |
VIL |
A9 = VH (3) |
Identification Code |
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A0 = VIH or VIL |
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A1 - A15 = VIL |
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Notes: 1. |
X can be VIL or VIH. |
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4. Two identifier bytes may be selected. All Ai inputs are held |
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2. |
Refer to Programming Characteristics. |
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low (VIL), except A9 which is set to VH and A0 which is tog- |
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3. |
VH = 12.0 ± 0.5V. |
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gled low (VIL) to select the Manufacturer’s Identification byte |
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and high (VIH) to select the Device Code byte. |
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3-137 |
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