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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.
27C256 Pinout
27C256 Pin Configuration
Pin Number | Pin No | Description |
---|---|---|
1 | VPP | Programming Supply |
2 | A12 | Address Input |
3 | A7 | Address Input |
4 | A6 | Address Input |
5 | A5 | Address Input |
6 | A4 | Address Input |
7 | A3 | Address Input |
8 | A2 | Address Input |
9 | A1 | Address Input |
10 | A0 | Address Input |
11 | O0 | Data Output |
12 | O1 | Data output |
13 | O2 | Data output |
14 | GND | Ground |
15 | O3 | Data output |
16 | O4 | Data output |
17 | O5 | Data output |
18 | O6 | Data output |
19 | O7 | Data output |
20 | CE | Chip Enable |
21 | A10 | Address Input |
22 | OE | Output Enable |
23 | A11 | Address Input |
24 | A9 | Address Input |
25 | A8 | Address Input |
26 | A8 | Address Input |
27 | A14 | Address Input |
28 | Vcc | Positive Power Supply |
27C256 Key Features
- 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, Industrial and Automotive Temperature Ranges
- JEDEC Standard Packages
- 28-Lead 600-mil PDIP
- 32-Lead PLCC
- 28-Lead TSOP and SOIC
You can download this datasheet for 27C256 256K 100ns CMOS EPROM – Datasheet from the link given below: