AT17C256A-10JI

AT17C256A-10JI Datasheet


The AT17C65A/128A/256A and AT17LV65A/128A/256A low-density AT17A Series FPGA Configuration EEPROMs configurators provide an easy-to-use, cost-effective configuration memory for programming Altera FLEX devices. The AT17A Series is packaged in the popular 20-lead PLCC. The AT17A Series family uses a simple serialaccess procedure to configure one or more FPGA devices. The AT17A Series organization supplies enough memory to configure one or multiple smaller FPGAs. Using a feature of the AT17A Series, the user can select the polarity of the reset function by programming a special EEPROM byte. These devices also support a write-protection mechanism within its programming mode.

Part Datasheet
AT17C256A-10JI AT17C256A-10JI AT17C256A-10JI (pdf)
Related Parts Information
AT17C65A-10JI AT17C65A-10JI AT17C65A-10JI
AT17C256A-10JC AT17C256A-10JC AT17C256A-10JC
AT17C128A-10JC AT17C128A-10JC AT17C128A-10JC
AT17C65A-10JC AT17C65A-10JC AT17C65A-10JC
PDF Datasheet Preview
• Serial EEPROM Family for Configuring Altera Devices
• In-System Programmable via 2-wire Bus
• Simple Interface to SRAM FPGAs
• EE Programmable 64K, 128K and 256K Bits Serial Memories Designed to Store

Configuration Programs for Field Programmable Gate Arrays FPGAs
• Cascadable Read-back to Support Additional Configurations or Future Higher-density

Arrays 128K and 256K only
• Low-power CMOS EEPROM Process
• Programmable Reset Polarity
• Available in the Space-efficient Surface-mount PLCC Package Compatible across

Product Family
• Emulation of Atmel’s AT24CXXX Serial EEPROMs
• Available in 3.3V ± 10% LV and 5V ± 5% C Versions

The AT17C65A/128A/256A and AT17LV65A/128A/256A low-density AT17A Series FPGA Configuration EEPROMs configurators provide an easy-to-use, cost-effective configuration memory for programming Altera FLEX devices. The AT17A Series is packaged in the popular 20-lead PLCC. The AT17A Series family uses a simple serialaccess procedure to configure one or more FPGA devices. The AT17A Series organization supplies enough memory to configure one or multiple smaller FPGAs. Using a feature of the AT17A Series, the user can select the polarity of the reset function by programming a special EEPROM byte. These devices also support a write-protection mechanism within its programming mode.

The AT17A Series Configurators can be programmed with industry-standard programmers or Atmel’s ATDH2200E Programming Kit.

Pin Configurations
20-lead PLCC
3 NC 2 DATA 1 NC 20 VCC 19 NC

DCLK 4 NC 5 NC 6 NC 7

WP OE 8
18 SER_EN 17 NC 16 NC 15 NC 14 NC

FPGA Configuration EEPROM Memory
64-kilobit, 128-kilobit and 256-kilobit Altera Pinout

AT17C65A AT17LV65A AT17C128A AT17LV128A AT17C256A AT17LV256A
nCS 9 GND 10

NC 11 A2 nCASC 12

NC 13

Block Diagram

POWER ON RESET

Device Configuration

The control signals for the configuration EEPROM nCS, OE, and DCLK interface directly with the FPGA device control signals. All FPGA devices can control the entire configuration process and retrieve data from the configuration EEPROM without requiring an external intelligent controller.

The configuration EEPROM device’s OE and nCS pins together control the tri-state buffer on the DATA output pin and enable the address counter. When OE is driven Low, the configuration EEPROM resets its address counter and tri-states its DATA pin. The nCS pin also controls the output of the AT17A Series Configurator. If nCS is held High after the OE reset pulse, the counter is disabled and the DATA output pin is tri-stated. When nCS is subsequently driven Low, the counter and the DATA output pin are enabled. When OE is driven Low again, the address counter is reset and the DATA output pin is tri-stated, regardless of the state of nCS.

When the configurator has driven out all of its data and nCASC is driven Low, the device tri-states the DATA pin to avoid contention with other configurators. Upon power-up, the address counter is automatically reset.
2 AT17C/LV65A/128A/256A

FPGA Device Configuration

AT17C/LV65A/128A/256A

This document discusses the EPF8K and EPF10K device interfaces. For more details or information on other Altera applications, please reference the “AT17A Series Conversions from Altera FPGA Serial Configuration Memories” application note.

FPGA devices can be configured with a low-density AT17A Series EEPROM see Figure 1 and Figure The AT17A Series device stores configuration data in its EEPROM array and clocks the data out serially according to an external clock source. The OE, nCS and DCLK pins supply the control signals for the address counter and the output tri-state buffer. The AT17A Series device sends a serial bitstream of configuration data to its DATA pin, which is connected to the DATA0 input pin on the FPGA device.

When configuration data for an FPGA device exceeds the capacity of a single AT17A Series device, multiple AT17A Series devices can be serially linked together see Figure When multiple AT17A Series devices are required, the nCASC and nCS pins provide handshaking between the cascaded EEPROMs. Note A single AT17C/LV65A may only be used at the end of a cascade chain or as a stand-
alone device.

The first AT17A Series Configurator whose nCS input is directly driven by the FPGA provides the first stream of data to the FPGA device during multi-device configuration. Once the first AT17A Series device finishes sending configuration data, it drives its nCASC pin Low, which drives the nCS pin of the second AT17A Series device Low. This allows the second AT17A Series device to send configuration data to the FPGA.

If the nCS pin on the first AT17A Series device is driven High before all configuration data is transferred, or if nCS is not driven High after all configuration data is transferred, nSTATUS is driven Low, indicating a configuration error.

The low density AT17A Series Configuration EEPROMs are not designed to act as system masters i.e., provide clock pulses on the serial bus to other devices . Clocking must be supplied by an FPGA device, a high-density AT17A Series device see Figure 3 , or an external oscillator.

Figure FPGA Device Configured with a Single AT17A Series Configurator 1 2 3

EXT_CLK

EPF6K
nCONFIG

DCLK

DATA0

CONF_DONE
Ordering Information 5V Devices 1

Memory Size
Ordering Code

Package

Operation Range
64-Kbit 2

AT17C65A-10JC

Commercial
0°C to 70°C

AT17C65A-10JI

Industrial
-40°C to 85°C
128-Kbit

AT17C128A-10JC

Commercial
0°C to 70°C
256-Kbit 3

AT17C128A-10JI AT17C256A-10JC

Industrial
-40°C to 85°C

Commercial
0°C to 70°C

AT17C256A-10JI

Industrial
-40°C to 85°C

Currently, there are two types of low-density configurators. The new version will be identified by a “B” after the datacode. The “B” version is fully backward-compatible with the original devices so existing customers will not be affected. The new parts no longer require a MUX for ISP. See programming specification for more details.

Use 64-Kbit density parts to replace Altera EPC1064. Use 256-Kbit density parts to replace Altera EPC1213.
Ordering Information 3.3V Devices 1

Memory Size 64-Kbit 2
Ordering Code AT17LV65A-10JC

Package 20J

Operation Range Commercial 0°C to 70°C

AT17LV65A-10JI

Industrial
-40°C to 85°C
128-Kbit

AT17LV128A-10JC

Commercial
0°C to 70°C
256-Kbit 3

AT17LV128A-10JI AT17LV256A-10JC

Industrial
-40°C to 85°C

Commercial
0°C to 70°C

AT17LV256A-10JI

Industrial
-40°C to 85°C

Currently, there are two types of low-density configurators. The new version will be identified by a “B” after the datacode. The “B” version is fully backward-compatible with the original devices so existing customers will not be affected. The new parts no longer require a MUX for ISP. See programming specification for more details.

Use 64-Kbit density parts to replace Altera EPC1064. Use 256-Kbit density parts to replace Altera EPC1213.

Package Type
20-lead, Plastic J-leaded Chip Carrier PLCC

Packaging Information
20J, 20-lead, Plastic J-leaded Chip Carrier PLCC Dimensions in Inches and Millimeters

JEDEC STANDARD MS-018 AA
14 AT17C/LV65A/128A/256A

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More datasheets: BC212_J35Z | BC212 | BC212_D26Z | BC212_D75Z | BC212_D27Z | BC212_D74Z | ACW007 | AT17C65A-10JI | AT17C256A-10JC | AT17C128A-10JC


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Datasheet ID: AT17C256A-10JI 518857