| Density | 256K |
| Organization | 32K x 8 |
| Speed | 45，70 ns |
| Vcc (V) | 5 |
| Packages | TSOP 28 PDIP 28 PLCC 32 SOIC (330mil) 28 |
| Pb-Free Packages | TSOP 28 PDIP 28 PLCC 32 SOIC (330mil) 28 |
256K EPROM
The AT27C256R is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM) organized 32K 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 low-active power consumption, and fast programming. Power consumption is typically only 8 mA in Active Mode and less than 10 μA in Standby.
The AT27C256R is available in a choice of industry-standard JEDEC-approved one time programmable (OTP) plastic DIP, PLCC, SOIC, and TSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention. With 32K byte storage capability, the AT27C256R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. Atmel’s AT27C256R 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.
| Ordering Code | Package | ICC (mA) VCC = 3.6V |
tACC (ns) |
Operation Range | |
| Active | AStandby | ||||
| AT27C256R-45JU AT27C256R-45PU AT27C256R-45RU AT27C256R-45TU |
32J 28P6 28R(1) 28T |
20 | 0.1 | 45 | Industrial (-40°C to +85°C) |
| AT27C256R-70JU AT27C256R-70PU AT27C256R-70RU AT27C256R-70TU |
32J 28P6 28R(1) 28T |
20 | 0.1 | 70 | Industrial (-40°C to +85°C) |