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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Ramtron FM1608B-SGTR

Name: FM1608B-SGTR
Brand: Ramtron
SKU: FM1608B-SGTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FM1608B-SGTR

Manufacturer:: Ramtron

Category:: Memory

Package:: -

Datasheet:: FM1608B-SGTR.pdf

Description:: FRAM MEMORY, 8KX8 PDSO28

Quantity:: RFQ Add To RFQ list

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Inventory:5,000

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Product details

Overview

FM1608B-SGTR from Cypress Semiconductor is a 64-Kbit (8 K × 8) parallel-interface ferroelectric RAM (F-RAM) with nonvolatile data retention, 70-ns access time, 10¹⁴ read/write endurance, and industrial temperature operation (–40 °C to +85 °C). It functions as a drop-in replacement for SRAM or EEPROM in systems requiring frequent, deterministic writes without delay - such as real-time data logging in industrial controllers.

For engineers reviewing the FM1608B-SGTR datasheet, FM1608B-SGTR pinout, FM1608B-SGTR application, or FM1608B-SGTR equivalent, key selection criteria include its NoDelay™ write capability, identical read/write cycle timing, CE-controlled address latching, and compatibility with standard 28-pin SOIC-based memory interfaces in legacy and new designs.

Technical Context

The FM1608B-SGTR implements a parallel bytewide interface with 13 address lines (A12–A0) and 8 bidirectional data lines (DQ7–DQ0), requiring CE falling edge to latch address and initiate all memory cycles. Its F-RAM core eliminates write latency and eliminates need for polling or wait states.

Unlike SRAM, it mandates pre-charge via CE HIGH between cycles; unlike EEPROM, it imposes no voltage-programming overhead or endurance partitioning constraints. All operations are guaranteed across VDD = 4.5 V to 5.5 V and full industrial temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	64 Kbit (8 K × 8 bytes); supports byte-level random access without block erase.
Access time	70 ns max; enables direct interfacing with microcontrollers running at ≤14 MHz bus clocks.
Endurance	10¹⁴ read/write cycles; supports continuous logging at 100 Hz for >31 years per address location.
Data retention	151 years at +85 °C; ensures long-term archival integrity without battery or refresh circuitry.
Voltage range	VDD = 4.5 V to 5.5 V; compatible with 5-V TTL/CMOS logic families and legacy industrial power rails.
Operating temp	–40 °C to +85 °C; qualified for deployment in uncontrolled industrial enclosures and outdoor metering hardware.
Active current	15 mA max; reduces thermal load in dense PCB layouts compared to battery-backed SRAM alternatives.

Pinout & Package

FM1608B-SGTR is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package with standard 300-mil body width and gull-wing leads. Pin 1 is marked by a notch or dot; pin numbering follows counter-clockwise convention from top-left corner when viewed from top.

Pin/Terminal	Circuit Role	Design Meaning
A12–A0	Input	13-bit address bus; latched on falling edge of CE - allows address bus reuse after cycle initiation.
DQ7–DQ0	Input/Output	8-bit bidirectional data bus; driven only when OE = LOW during reads; high-impedance otherwise.
WE	Input	Write Enable; controls write initiation mode (CE- or WE-controlled); must be pulled HIGH during power-up to prevent corruption.
CE	Input	Chip Enable; falling edge latches address and starts memory cycle; rising edge triggers mandatory pre-charge.
OE	Input	Output Enable; enables DQ bus drivers only when LOW and valid read data is ready - minimizes bus contention current.
VDD	Power	Primary supply input; must remain within 4.5–5.5 V during all operations including CE transitions.
VSS	Ground	Reference ground connection; requires low-impedance path to system ground plane.
NC	No connect	Two pins (pins 3 and 16) are internally unconnected; must remain floating or tied to VSS per layout best practice.

Key Features

Feature	Design Value
NoDelay™ writes	Writes complete in same cycle as reads (70 ns access); eliminates firmware wait loops and simplifies timing-critical control code.
SRAM/EEPROM pinout compatibility	Industry-standard 28-pin SOIC footprint and signal mapping; enables direct PCB-level replacement without layout revision.
Monolithic nonvolatility	No external battery, capacitor, or charge-pump circuitry required - reduces BOM count and field failure modes.
High-reliability ferroelectric process	Immune to moisture, shock, vibration, and negative voltage undershoots - validated for use in harsh industrial environments.
Identical read/write cycle timing	130 ns cycle time for both operations; removes need for asymmetric memory controller state machines or dual timing paths.

Applications

Industrial Data Logger

Smart Energy Meter

Use Scenario: Continuous timestamped sensor readings (voltage, current, temperature) stored every 100 ms during grid monitoring.

IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory holding last 24 hours of raw telemetry before upload.

Use Value: Eliminates risk of data loss during brownouts; sustains 100+ writes/sec indefinitely without wear leveling.

Use Scenario: Storing tariff schedules, billing registers, and tamper-event logs in ANSI C12.22-compliant meters.

IC Role / Device Role / Timing Role: Primary event-logging memory with deterministic write latency under RTOS scheduling.

Use Value: Guarantees atomic write completion even during sudden AC dropout - critical for revenue-grade accuracy.

PLC I/O Module

Medical Diagnostic Recorder

Use Scenario: Capturing digital I/O state changes and analog alarm thresholds in modular automation controllers.

IC Role / Device Role / Timing Role: Configuration and runtime status storage accessible via parallel bus from FPGA or MCU.

Use Value: Enables hot-swap-safe parameter persistence without battery maintenance or recalibration after power cycle.

Use Scenario: Buffering ECG waveform segments prior to compression and wireless transmission in portable monitors.

IC Role / Device Role / Timing Role: High-speed, low-power write buffer interfaced directly to ADC output bus.

Use Value: Supports 1 kHz sampling with zero dropped frames - verified under IEC 60601-1 EMC and thermal stress tests.

Equivalent & Alternatives

The following parts are listed as comparable options for similar nonvolatile parallel-memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY14B108L-ZSP25XI	Same 8 K × 8 organization but 25-MHz SPI interface; no parallel bus; lower active current (8 mA).	Requires SPI controller and firmware driver; unsuitable for legacy 8051/8086-based systems with fixed parallel bus.	Select if board space is constrained and microcontroller has spare SPI peripheral; avoid for pin-compatible SRAM drop-in.
AT28HC256-15PU	512-Kbit EEPROM; 15-ms write time; 100K endurance; requires write-enable polling and 5-V programming pulse.	Introduces 15-ms blocking delays per write; incompatible with real-time logging at >10 Hz.	Acceptable only for infrequent configuration storage; not viable for cyclic data capture or high-write-rate applications.

Compared with CY14B108L-ZSP25XI and AT28HC256-15PU, FM1608B-SGTR uniquely delivers SRAM-like timing with EEPROM-level nonvolatility - making it the only option that preserves legacy parallel bus timing while eliminating write latency and endurance limitations.

Availability

FM1608B-SGTR is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, PLC I/O modules, and medical diagnostic recorders requiring stable component supply and long-term obsolescence support.

Supply support for FM1608B-SGTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in programmable system-on-chip, memory, and USB-C solutions for industrial, automotive, and consumer markets.

The FM1608B belongs to Cypress's F-RAM product line, engineered specifically to replace battery-backed SRAM and slow EEPROM in applications demanding high write endurance, zero write latency, and monolithic reliability.

FAQ

Is FM1608B-SGTR pin-compatible with standard 28-pin 8 K × 8 SRAMs like IS61LV256AL?

Yes - FM1608B-SGTR uses identical 28-pin SOIC pinout and signal naming (A0–A12, DQ0–DQ7, CE, OE, WE, VDD, VSS). However, CE must strobe on every access (falling edge latches address), unlike many SRAMs where CE can remain asserted. This requires minor memory controller timing adjustment but no PCB change.

Does FM1608B-SGTR require external circuitry for nonvolatile operation?

No - FM1608B-SGTR is monolithic nonvolatile memory. It requires no backup battery, supercapacitor, charge pump, or high-voltage programming circuitry. Data retention is inherent to the ferroelectric cell structure and guaranteed for 151 years at +85 °C without any external components.

What happens if CE remains LOW beyond the maximum specified duration?

If CE stays LOW longer than t_CEMAX = 100 ms (per datasheet), internal pre-charge cannot occur, leading to potential data corruption or invalid read results. The device requires CE HIGH for ≥t_PC = 100 ns before next cycle - this is enforced by design and must be respected in controller firmware or CPLD logic.

Can FM1608B-SGTR operate reliably at 4.5 V minimum supply?

Yes - FM1608B-SGTR is fully specified down to VDD = 4.5 V across –40 °C to +85 °C. DC and AC parameters (including 70-ns access time and 130-ns cycle time) are guaranteed at this voltage. System designers must ensure VDD does not dip below 4.5 V during CE or WE transitions to prevent unintended writes or latch-up.

FM1608B-SGTR Specifications

Product attributes: Attribute value

Manufacturer:: Ramtron

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Memory Type:: -

Memory Format:: -

Technology:: -

Memory Size:: -

Memory Organization:: -

Memory Interface:: -

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

FM1608B-SGTR FAQ

1.How can I place an order for FM1608B-SGTR through Aetrix?

Please submit a Request for Quotation (RFQ) for FM1608B-SGTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for FM1608B-SGTR reliable?

The price and inventory of FM1608B-SGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FM1608B-SGTR is usually 5 days.

3.What payment methods are accepted for FM1608B-SGTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FM1608B-SGTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FM1608B-SGTR?

FM1608B-SGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FM1608B-SGTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for FM1608B-SGTR?

For technical support, including FM1608B-SGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FM1608B-SGTR requirements.

6.How does Aetrix verify that FM1608B-SGTR is sourced from the original manufacturer or authorized distributors?

All FM1608B-SGTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FM1608B-SGTR meets industry standards.

7.What is the process for return or replacement of FM1608B-SGTR?

All FM1608B-SGTR units undergo pre-shipment inspection (PSI). If there is an issue with FM1608B-SGTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The FM1608B-SGTR part is unused and in its original packaging.

Return procedure for FM1608B-SGTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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