29C256 256k 120ns CMOS Flash Memory

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The 29C256 is a five-volt-only in-system Flash programmable and erasable read-only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits. The device offers access times to 70 ns with a power dissipation of just 275 mW. When the device is deselected, the CMOS standby current is less than 300 µA. Five-volt-only commands determine the operation of the device. Reading data out of the device is similar to reading from a static RAM. Reprogramming the AT29C256 is performed on a page basis; 64 bytes of data are loaded into the device and then simultaneously programmed. The contents of the entire device may be erased by using a six-byte software code (although erasure before programming is not needed)

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29C256 Pinout

29C256 Pin Configuration

Pin No	Pin Name	Description
1	DC	Don’t Connect
2	WE’	Write Enable Pin
3	A12	Address Pin 12
4	A7	Address Pin 7
5	A6	Address Pin 6
6	A5	Address Pin 5
7	A4	Address Pin 4
8	A3	Address Pin 3
9	A2	Address Pin 2
10	A1	Address Pin 1
11	A0	Address Pin 0
12	NC	No Connection
13	I/O 0	Data Inputs/Outputs 0
14	I/O 1	Data Inputs/Outputs 1
15	I/O 2	Data Inputs/Outputs 2
16	GND	Ground Pin
17	DC	Don’t Connect
18	I/O 3	Data Inputs/Outputs 3
19	I/O 4	Data Inputs/Outputs 4
20	I/O 5	Data Inputs/Outputs 5
21	I/O 6	Data Inputs/Outputs 6
22	I/O 7	Data Inputs/Outputs 7
23	CE’	Chip Enable Pin
24	A10	Address Pin 10
25	OE’	Output Enable Pin
26	NC	No Connection
27	A11	Address Pin 11
28	A9	Address Pin 9
29	A8	Address Pin 8
30	A13	Address Pin 13
31	A14	Address Pin 14
32	VCC	Power Supply

29C256 Key Feature

Fast Read Access Time – 70 ns
5-Volt-Only Reprogramming
Sector Program Operation
- Single Cycle Reprogram (Erase and Program)
- Internal Address and Data Latches for 64-Bytes
Internal Program Control and Timer
Hardware and Software Data Protection
Two 16 KB Boot Blocks with Lockout
Fast Sector Program Cycle
- Page (64 Byte) Program Time – 10 ms
- Chip Erase Time – 10 ms
DATA Polling for End of Program Detection
Low Power Dissipation
- 50 mA Active Current
- 300 µA CMOS Standby Current
Typical Endurance > 10,000 Cycles
Single 5V ± 10% Supply
CMOS and TTL Compatible Inputs and Outputs