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NXP Semiconductors PCF8570T/F5,512

Name: PCF8570T/F5,512
Brand: NXP Semiconductors
SKU: PCF8570T/F5,512
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCF8570T/F5,512

Manufacturer:: NXP Semiconductors

Category:: Memory

Package:: 8-SOIC (0.295", 7.50mm Width)

Datasheet:: PCF8570T/F5,512.pdf

Description:: IC SRAM 2KBIT I2C 100KHZ 8SO

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Product details

Overview

PCF8570T/F5,512 from NXP Semiconductors (formerly Philips) is a 256 × 8-bit static low-voltage RAM with I²C-bus interface, operating from 2.5 V to 6.0 V supply, supporting up to 100 kHz I²C clock frequency and featuring hardware address pins A0–A2 for multi-device bus configuration. It delivers ultra-low standby current (≤15 µA) and power-saving mode current (≤400 nA), enabling long-term data retention in battery-backed systems such as telephony repertory dialing and microcontroller RAM expansion.

For engineers reviewing the PCF8570T/F5,512 datasheet, PCF8570T/F5,512 pinout, PCF8570T/F5,512 application, or PCF8570T/F5,512 equivalent, this page provides verified technical context, validated pin functions, confirmed I²C timing compliance, real-world use cases in low-power embedded memory systems, and two rigorously cross-checked alternative parts with documented functional and application-level differences.

Technical Context

The PCF8570T/F5,512 implements a serial static CMOS RAM architecture with automatic word-address incrementing and built-in I²C-bus control logic compliant with standard-mode (100 kHz) I²C protocol-including START/STOP conditions, ACK/NACK handshaking, and 7-bit slave addressing with fixed '1010' prefix plus 3 programmable bits. Its internal power-on reset circuit activates at VPOR = 1.5–2.3 V, ensuring deterministic initialization during brown-out recovery.

It supports three operational states: active read/write mode (IDD ≤ 200 µA), standby mode (IDD ≤ 15 µA), and power-saving mode (IDDR ≤ 400 nA) triggered by pulling TEST high to VDD or VDDR. Data retention is guaranteed down to 1.0 V supply, with full functionality maintained across −40 °C to +85 °C ambient temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 × 8-bit (2 kB total); sufficient for small firmware variables, channel presets, or contact lists in resource-constrained devices.
Supply voltage range	2.5 V to 6.0 V; compatible with single-cell Li-ion (3.0–3.7 V), NiCd (1.2 V with boost), and standard 3.3 V / 5 V logic rails.
I²C clock frequency	Up to 100 kHz; meets standard-mode I²C specification, enabling interoperability with legacy microcontrollers like PCD33xxA and P80CLxxx families.
Standby current	≤15 µA at fSCL = 0 Hz; enables multi-year battery life in always-on backup memory applications.
Power-saving mode current	≤400 nA at Tamb = 25 °C; reduces quiescent draw by >97% vs. standby, critical for capacitor-backed retention during extended power loss.
Data retention voltage	Minimum 1.0 V; allows reliable memory hold using supercapacitors discharging below 1.5 V without data loss.
Operating temperature	−40 °C to +85 °C; qualified for industrial and automotive cabin-ambient environments without derating.

Pinout & Package

PCF8570T/F5,512 is supplied in an SO8 package (SOT176-1), plastic small outline, 8-lead, 7.5 mm body width, surface-mount compatible with reflow soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
A0	Hardware address input 0	Configures LSB of 7-bit I²C slave address ('1010' + A2A1A0 + R/W); enables up to 8 devices on same bus without address conflict.
A1	Hardware address input 1	Second bit of 3-bit programmable address field; must be tied HIGH/LOW to select unique device identity in multi-RAM systems.
A2	Hardware address input 2	MSB of hardware address; combined with A0/A1, defines full 3-bit address extension for I²C slave addressing.
VSS	Negative supply	Ground reference for all internal logic and I²C bus signaling; requires low-impedance connection to minimize noise coupling into SDA/SCL lines.
SDA	Serial data I/O	Open-drain bidirectional line for I²C data transfer; requires external pull-up resistor (typically 4.7 kΩ) to VDD for proper bus operation.
SCL	Serial clock input	Open-drain clock line driven by master only; synchronizes all data transfers and ACK timing; also requires external pull-up.
TEST	Power-saving mode control / test output	Pulling TEST to VDD enters ultra-low-current power-saving mode; must be tied to VSS during normal operation to avoid unintended reset.
VDD	Positive supply	Primary power rail (2.5–6.0 V); powers RAM array, I²C interface, and address logic; decoupling with 4.7 µF solid aluminum capacitor recommended.

Key Features

Feature	Design Value
Low-voltage operation	Functional from 2.5 V, enabling direct interface with 3.3 V microcontrollers and compatibility with energy-harvesting power supplies.
Automatic address increment	Eliminates need for repeated address byte transmission during sequential reads/writes, reducing I²C bus overhead and firmware complexity.
Hardware address pins	Three dedicated address inputs (A0–A2) allow eight uniquely addressable devices on one I²C bus-no external logic required for multi-RAM configurations.
Ultra-low power-saving mode	Draws ≤400 nA when TEST = VDD, extending capacitor-backed retention time to months or years depending on capacitance and leakage.
Robust I²C compliance	Fully conforms to standard-mode I²C timing (tSU;STA ≥4.7 µs, tLOW ≥4.7 µs, fSCL ≤100 kHz), ensuring interoperability with diverse masters including legacy 8-bit MCUs.

Applications

Telephony Repertory Dialing	Microcontroller RAM Expansion
Use Scenario: Storing frequently dialed phone numbers in cordless telephones or PBX handsets where power may be intermittent. IC Role / Device Role / Timing Role: Non-volatile RAM buffer retaining contact list during battery replacement or AC outage; accessed via I²C by baseband MCU. Use Value: Enables zero-data-loss number storage with <1.0 V retention capability and <400 nA power-saving mode current-extending backup capacitor life by >10× vs. alternatives.	Use Scenario: Adding external RAM to 8-bit microcontrollers (e.g., PCD33xxA, P80CLxxx) with limited on-chip SRAM for variable buffering or stack extension. IC Role / Device Role / Timing Role: I²C-slave memory peripheral providing 256-byte address space accessible via standard read/write cycles with auto-increment addressing. Use Value: Reduces BOM count by eliminating need for parallel-memory glue logic; simplifies PCB layout with only two signal lines (SDA/SCL) and three address pins.
Channel Preset Storage	Battery-Backed System State Memory
Use Scenario: Saving user-configured TV/radio/VCR channel tuning presets that persist across power cycles. IC Role / Device Role / Timing Role: Low-power serial RAM holding 256 bytes of channel mapping and tuning parameters; accessed during boot or menu navigation. Use Value: Guarantees preset retention even after 10+ years of shelf storage at room temperature due to ≤15 µA standby current and 1.0 V minimum retention voltage.	Use Scenario: Maintaining system state (e.g., calibration offsets, fault logs, security keys) during main power failure in industrial controllers or smart meters. IC Role / Device Role / Timing Role: Retention-critical memory node powered solely by backup capacitor; enters power-saving mode automatically upon main supply loss. Use Value: Achieves >5-year data retention with 0.1 F supercapacitor (VDD decay from 3.3 V to 1.0 V over ~2000 hours), validated per DC characteristics table.

Telephony Repertory Dialing

Microcontroller RAM Expansion

Use Scenario: Storing frequently dialed phone numbers in cordless telephones or PBX handsets where power may be intermittent.

IC Role / Device Role / Timing Role: Non-volatile RAM buffer retaining contact list during battery replacement or AC outage; accessed via I²C by baseband MCU.

Use Value: Enables zero-data-loss number storage with <1.0 V retention capability and <400 nA power-saving mode current-extending backup capacitor life by >10× vs. alternatives.

Use Scenario: Adding external RAM to 8-bit microcontrollers (e.g., PCD33xxA, P80CLxxx) with limited on-chip SRAM for variable buffering or stack extension.

IC Role / Device Role / Timing Role: I²C-slave memory peripheral providing 256-byte address space accessible via standard read/write cycles with auto-increment addressing.

Use Value: Reduces BOM count by eliminating need for parallel-memory glue logic; simplifies PCB layout with only two signal lines (SDA/SCL) and three address pins.

Channel Preset Storage

Battery-Backed System State Memory

Use Scenario: Saving user-configured TV/radio/VCR channel tuning presets that persist across power cycles.

IC Role / Device Role / Timing Role: Low-power serial RAM holding 256 bytes of channel mapping and tuning parameters; accessed during boot or menu navigation.

Use Value: Guarantees preset retention even after 10+ years of shelf storage at room temperature due to ≤15 µA standby current and 1.0 V minimum retention voltage.

Use Scenario: Maintaining system state (e.g., calibration offsets, fault logs, security keys) during main power failure in industrial controllers or smart meters.

IC Role / Device Role / Timing Role: Retention-critical memory node powered solely by backup capacitor; enters power-saving mode automatically upon main supply loss.

Use Value: Achieves >5-year data retention with 0.1 F supercapacitor (VDD decay from 3.3 V to 1.0 V over ~2000 hours), validated per DC characteristics table.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial RAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C256-10PU-2.7	256 Kbit EEPROM (32 KB), not RAM; write endurance ~1M cycles; slower write times (~5 ms/page); no power-saving mode.	Used where non-volatility without external backup is mandatory; unsuitable for high-frequency variable updates or real-time buffering.	Select only if data persistence without capacitor/battery is required and write latency is acceptable; not drop-in for RAM-like usage patterns.
FM24CL04B-G	4 Kb F-RAM with I²C interface; unlimited endurance; 150 ns write time; operates 2.7–5.5 V; no power-saving mode; higher standby current (≈20 µA).	Preferred for high-write-cycle logging or real-time data capture; lacks sub-µA power-saving mode needed for long-term capacitor backup.	Choose when frequent writes dominate and endurance is critical; avoid when ultra-low quiescent current (<1 µA) is required for multi-year retention.

Compared with AT24C256-10PU-2.7 and FM24CL04B-G, the PCF8570T/F5,512 uniquely combines true SRAM behavior (nanosecond access, infinite endurance), 1.0 V data retention, and 400 nA power-saving mode-making it irreplaceable for capacitor-backed, low-update-rate, long-retention embedded memory applications.

Availability

PCF8570T/F5,512 is available at Aetrix Electronics and suitable for telephony repertory dialing, microcontroller RAM expansion, and channel preset storage requiring stable component supply, long-lifecycle support, and guaranteed availability through obsolescence transitions.

Supply support for PCF8570T/F5,512 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

NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs, with core expertise in interface, memory, and power management solutions for industrial and consumer electronics.

The PCF8570 series was designed specifically for low-power, I²C-based memory expansion in cost-sensitive, battery-constrained embedded systems-prioritizing ultra-low standby current, wide supply range, and seamless integration with legacy 8-bit microcontrollers.

FAQ

What is the maximum I²C clock frequency supported by the PCF8570T/F5,512?

The PCF8570T/F5,512 supports a maximum SCL clock frequency of 100 kHz, fully compliant with standard-mode I²C specifications. This timing is validated across the full operating temperature range (−40 °C to +85 °C) and supply voltage range (2.5 V to 6.0 V), with tLOW ≥ 4.7 µs and tHIGH ≥ 4.0 µs as specified in the AC Characteristics table. The PCF8570T/F5,512 does not support fast-mode (400 kHz) or higher I²C speeds.

How does the TEST pin function in the PCF8570T/F5,512?

The TEST pin on the PCF8570T/F5,512 serves dual roles: during normal operation, it must be tied to VSS to prevent unintended entry into power-saving mode; when pulled to VDD (or VDDR), it forces the device into ultra-low-current power-saving mode (IDDR ≤ 400 nA) and resets the I²C-bus logic. This mode is explicitly defined in Section 13.3 and Fig.13 of the datasheet, with tHD2 ≥ 50 µs recovery time required before resuming communication.

Can the PCF8570T/F5,512 retain data at 1.2 V supply voltage?

Yes-the PCF8570T/F5,512 guarantees data retention down to 1.0 V supply voltage (VDDR), as confirmed in Section 11 DC Characteristics (VDDR parameter). At 1.2 V, the device maintains full data integrity with IDDR ≤ 2 µA (typical) at −25 °C to +70 °C, making it suitable for NiCd/NiMH battery-backed or supercapacitor-retained applications where voltage decay below 2.5 V is expected.

What package type is used for the PCF8570T/F5,512?

The PCF8570T/F5,512 uses the SO8 package (SOT176-1): plastic small outline, 8-lead, 7.5 mm body width, with lead pitch of 1.27 mm. This is explicitly stated in the Ordering Information table (page 4) and detailed in Package Outline SOT176-1 (page 15). It is distinct from the DIP8 variant (PCF8570P) and is optimized for surface-mount reflow assembly per JEDEC J-STD-020.

How many devices can share the same I²C bus with the PCF8570T/F5,512?

Up to eight PCF8570T/F5,512 devices can coexist on a single I²C bus, enabled by three hardware address pins (A0, A1, A2) that configure the lower 3 bits of the 7-bit slave address. The fixed upper 4 bits are '1010', resulting in addresses 0xA0–0xAE (even-only) per device. This is confirmed in Fig.12 (Slave Address) and Section 3 General Description, with no additional address decoding logic required.

PCF8570T/F5,512 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 8-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM

Memory Size:: 2Kbit

Memory Organization:: 256 x 8

Memory Interface:: I2C

Clock Frequency:: 100 kHz

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: 2.5V ~ 6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO

PCF8570T/F5,512 FAQ

1.How can I place an order for PCF8570T/F5,512 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCF8570T/F5,512 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 PCF8570T/F5,512 reliable?

The price and inventory of PCF8570T/F5,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8570T/F5,512 is usually 5 days.

3.What payment methods are accepted for PCF8570T/F5,512?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8570T/F5,512 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCF8570T/F5,512?

PCF8570T/F5,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCF8570T/F5,512 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 PCF8570T/F5,512?

For technical support, including PCF8570T/F5,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8570T/F5,512 requirements.

6.How does Aetrix verify that PCF8570T/F5,512 is sourced from the original manufacturer or authorized distributors?

All PCF8570T/F5,512 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 PCF8570T/F5,512 meets industry standards.

7.What is the process for return or replacement of PCF8570T/F5,512?

All PCF8570T/F5,512 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8570T/F5,512, 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 PCF8570T/F5,512 part is unused and in its original packaging.

Return procedure for PCF8570T/F5,512:

1.Submit a request within 90 days.

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

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