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NXP Semiconductors PCF8570T/F5,518

Name: PCF8570T/F5,518
Brand: NXP Semiconductors
SKU: PCF8570T/F5,518
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCF8570T/F5,518

Manufacturer:: NXP Semiconductors

Category:: Memory

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

Datasheet:: PCF8570T/F5,518.pdf

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

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Inventory:2,950

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Product details

Overview

PCF8570T/F5,518 from NXP Semiconductors (formerly Philips) is a 256 × 8-bit static low-voltage RAM with I²C-bus interface, designed for battery-backed or capacitor-retained memory expansion in microcontroller systems. It operates from 2.5 V to 6.0 V, delivers ≤15 µA standby current, supports hardware address selection via A0–A2 pins, and retains data down to 1.0 V supply - enabling use in telephony repertory dialing and channel preset storage.

For engineers reviewing the PCF8570T/F5,518 datasheet, PCF8570T/F5,518 pinout, PCF8570T/F5,518 application, or PCF8570T/F5,518 equivalent, this page provides verified technical context, I²C timing compliance (100 kHz max), power-saving mode behavior (50 nA typical), package-specific layout guidance for SO8, and validated alternative options for low-power serial RAM replacement.

Technical Context

The PCF8570T/F5,518 implements a fully static CMOS memory array organized as 256 words × 8 bits, accessed exclusively via the bidirectional two-wire I²C-bus (SDA/SCL). Its internal word address register auto-increments after each read or write byte, eliminating external address management overhead.

Hardware addressing uses three dedicated pins (A0, A1, A2) to configure one of eight possible slave addresses (1010xxxR/W), enabling multi-device bus topology without external logic. Power-saving mode is activated by pulling the TEST pin high (VDD or VDDR), resetting I²C logic and reducing supply current to 50 nA typical at 25 °C.

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 embedded systems.
Supply Voltage Range	2.5 V to 6.0 V; compatible with 3.3 V and 5 V logic domains, and supports brown-out operation down to 1.0 V for data retention.
I²C Clock Frequency	Up to 100 kHz; compliant with standard-mode I²C, suitable for low-speed control-plane memory access without signal integrity concerns.
Standby Current	≤15 µA at fSCL = 0 Hz; enables multi-year battery life in always-on backup applications such as telecom handsets.
Power-Saving Mode Current	50 nA typical at 25 °C when TEST = VDD; reduces quiescent draw by >300× versus standby, critical for capacitor-backed retention.
Operating Temperature	−40 °C to +85 °C; qualified for industrial and consumer equipment environments including set-top boxes and audio/video recorders.
Package	SO8 (SOT176-1); 7.5 mm body width, surface-mount, JEDEC-standard footprint for automated assembly and thermal reliability.

Pinout & Package

PCF8570T/F5,518 is housed in an 8-lead plastic small outline package (SO8, SOT176-1), with 1.27 mm lead pitch and gull-wing terminations. The package supports reflow soldering per JEDEC J-STD-020 and is rated for moisture sensitivity level (MSL) 1.

Pin/Terminal	Circuit Role	Design Meaning
A0	Hardware address input 0	Configures LSB of 3-bit device address; tied HIGH/LOW to select one of eight I²C slave addresses on shared bus.
A1	Hardware address input 1	Configures middle bit of 3-bit device address; enables up to eight PCF8570 devices on same I²C bus without address conflict.
A2	Hardware address input 2	Configures MSB of 3-bit device address; used with A0/A1 to define full 7-bit I²C slave address (1010xxxR/W).
VSS	Negative supply (ground)	Reference return path for all internal circuitry; must be connected directly to system ground plane with low-inductance trace.
SDA	Serial data I/O	Open-drain bidirectional data line; requires external pull-up resistor (typically 4.7 kΩ) to VDD for I²C protocol compliance.
SCL	Serial clock input	Open-drain clock line driven by master; synchronizes all data transfers; also requires external pull-up resistor.
TEST	Power-saving mode control / test output	Pulled to VDD to enter ultra-low-current mode (50 nA); must be tied to VSS during normal operation to avoid unintended reset.
VDD	Positive supply	Primary power rail (2.5–6.0 V); decoupling with 4.7 µF solid aluminum capacitor recommended per datasheet Fig.11.

Key Features

Feature	Design Value
Low-voltage data retention	Guaranteed memory retention at VDD ≥ 1.0 V - enables reliable backup using supercapacitors or NiCd cells without voltage regulators.
Automatic address incrementing	Internal word address register advances after each byte transfer, simplifying burst reads/writes and reducing host CPU overhead.
I²C-bus compatibility	Fully conforms to Philips I²C specification (100 kHz standard mode); includes START/STOP detection, ACK generation, and bus arbitration support.
Hardware address configuration	Three dedicated address pins (A0–A2) allow eight unique slave addresses on one bus - eliminates need for external address decoding logic.
Ultra-low-power modes	15 µA standby and 50 nA power-saving current enable decade-scale battery life in portable and maintenance-free systems.

Applications

Telephony Repertory Dialing	Channel Preset Storage
Use Scenario: Storing frequently dialed phone numbers in cordless handsets or PBX terminals with limited onboard memory. IC Role / Device Role / Timing Role: Nonvolatile RAM expansion for microcontroller (e.g., PCD33xxA) storing contact lists; accessed via I²C during keypad entry or auto-dial sequences. Use Value: Enables 256-entry repertory without external EEPROM or flash, leveraging existing I²C infrastructure and ultra-low standby current for battery longevity.	Use Scenario: Saving user-configured TV/radio channel tuning parameters across power cycles in analog/digital receivers. IC Role / Device Role / Timing Role: Backup RAM holding channel frequency, modulation, and audio settings; retains data during AC loss using capacitor backup. Use Value: Eliminates mechanical preset dials or costly nonvolatile memory; 1.0 V retention threshold allows direct connection to 1.2 V NiCd backup cell.
Microcontroller RAM Expansion	Capacitor-Backed Data Logger
Use Scenario: Extending working RAM for 8-bit microcontrollers (e.g., P80CLxxx) in industrial sensor nodes where SRAM is scarce. IC Role / Device Role / Timing Role: External scratchpad memory mapped via I²C; used for temporary buffers, calibration tables, or stack overflow handling. Use Value: Adds 2 kB of fast, low-latency RAM with no address/data bus routing - reduces PCB layer count and simplifies firmware integration.	Use Scenario: Recording timestamped sensor readings (temperature, humidity) in remote monitoring units powered by energy harvesting. IC Role / Device Role / Timing Role: Primary data buffer retaining logs during intermittent power; enters 50 nA power-saving mode between sampling intervals. Use Value: Achieves >10-year operational life on a single 0.47 F supercapacitor charged by solar cell, due to sub-µA quiescent draw.

Telephony Repertory Dialing

Channel Preset Storage

Use Scenario: Storing frequently dialed phone numbers in cordless handsets or PBX terminals with limited onboard memory.

IC Role / Device Role / Timing Role: Nonvolatile RAM expansion for microcontroller (e.g., PCD33xxA) storing contact lists; accessed via I²C during keypad entry or auto-dial sequences.

Use Value: Enables 256-entry repertory without external EEPROM or flash, leveraging existing I²C infrastructure and ultra-low standby current for battery longevity.

Use Scenario: Saving user-configured TV/radio channel tuning parameters across power cycles in analog/digital receivers.

IC Role / Device Role / Timing Role: Backup RAM holding channel frequency, modulation, and audio settings; retains data during AC loss using capacitor backup.

Use Value: Eliminates mechanical preset dials or costly nonvolatile memory; 1.0 V retention threshold allows direct connection to 1.2 V NiCd backup cell.

Microcontroller RAM Expansion

Capacitor-Backed Data Logger

Use Scenario: Extending working RAM for 8-bit microcontrollers (e.g., P80CLxxx) in industrial sensor nodes where SRAM is scarce.

IC Role / Device Role / Timing Role: External scratchpad memory mapped via I²C; used for temporary buffers, calibration tables, or stack overflow handling.

Use Value: Adds 2 kB of fast, low-latency RAM with no address/data bus routing - reduces PCB layer count and simplifies firmware integration.

Use Scenario: Recording timestamped sensor readings (temperature, humidity) in remote monitoring units powered by energy harvesting.

IC Role / Device Role / Timing Role: Primary data buffer retaining logs during intermittent power; enters 50 nA power-saving mode between sampling intervals.

Use Value: Achieves >10-year operational life on a single 0.47 F supercapacitor charged by solar cell, due to sub-µA quiescent draw.

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), I²C interface, 1 MHz clock, 5.5 V max, no power-saving mode, 1 µA standby.	Persistent nonvolatile storage vs. volatile RAM with backup; requires write-cycle delay (~5 ms), unsuitable for high-frequency variable access.	Choose for true nonvolatility and higher density; avoid if system needs byte-level random writes or sub-millisecond latency.
FM24CL04B-G	4 Kb F-RAM, I²C, 1 MHz, 2.7–5.5 V, 150 µA active, 10 µA standby, unlimited endurance, no write delay.	Combines RAM speed with EEPROM persistence; eliminates need for backup power but costs ~3× more than PCF8570T/F5,518.	Choose for mission-critical logging where data loss during power failure is unacceptable; accept premium cost and higher standby current.

Compared with AT24C256-10PU-2.7 and FM24CL04B-G, the PCF8570T/F5,518 offers the lowest standby and power-saving current (50 nA), making it uniquely suited for capacitor-backed applications where energy budget is constrained - though it requires external backup and lacks inherent nonvolatility.

Availability

PCF8570T/F5,518 is available at Aetrix Electronics and suitable for telephony repertory dialing, channel preset storage, and microcontroller RAM expansion requiring stable component supply and long-term lifecycle support.

Supply support for PCF8570T/F5,518 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 is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The PCF8570T/F5,518 belongs to NXP's legacy I²C-compatible memory portfolio, engineered specifically for ultra-low-power, battery- or capacitor-backed RAM expansion in resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the PCF8570T/F5,518?

The PCF8570T/F5,518 supports I²C standard-mode operation up to 100 kHz, as specified in its AC characteristics table. This frequency ensures robust noise immunity and compatibility with legacy microcontrollers lacking fast-mode I²C peripherals. Exceeding 100 kHz may cause timing violations or failed ACK responses, and the PCF8570T/F5,518 does not support fast-mode (400 kHz) or high-speed I²C protocols.

How does the TEST pin function in normal operation versus power-saving mode for the PCF8570T/F5,518?

In normal operation, the TEST pin of the PCF8570T/F5,518 must be tied to VSS (ground) to prevent unintended reset of the I²C-bus logic. When pulled to VDD or VDDR, the PCF8570T/F5,518 enters power-saving mode, reducing supply current to 50 nA typical and disabling bus communication until TEST is returned low and a valid START condition is detected.

Can the PCF8570T/F5,518 retain data at 1.2 V supply, and what is the minimum guaranteed retention voltage?

Yes - the PCF8570T/F5,518 guarantees data retention down to 1.0 V supply (VDDR min), as confirmed in DC Characteristics Table (VDDR parameter). At 1.2 V, retention is fully assured across the full −40 °C to +85 °C temperature range, enabling direct interfacing with single-cell NiCd/NiMH batteries or low-voltage supercapacitors without regulation.

What package type is used for the PCF8570T/F5,518, and are there footprint compatibility considerations with other SO8 devices?

The PCF8570T/F5,518 uses the SO8 package per SOT176-1 outline: 7.5 mm body width, 1.27 mm lead pitch, and gull-wing leads. Its footprint matches JEDEC MS-012AC and is mechanically compatible with standard SO8 footprints - however, thermal pad absence and specific solder mask clearance requirements per Philips SOT176-1 drawing must be verified before board reuse.

Does the PCF8570T/F5,518 require external pull-up resistors on SDA and SCL, and what value is recommended?

Yes - the PCF8570T/F5,518 has open-drain SDA and SCL pins and requires external pull-up resistors to VDD. Philips recommends 4.7 kΩ for standard-mode I²C at 100 kHz with typical bus capacitance (<400 pF); values may be adjusted downward for longer traces or higher noise immunity, but must remain within I²C bus rise-time constraints (tr ≤ 1.0 µs).

PCF8570T/F5,518 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

Packaging:: Tape & Reel (TR)

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/F5,518 FAQ

1.How can I place an order for PCF8570T/F5,518 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCF8570T/F5,518 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/F5,518 reliable?

The price and inventory of PCF8570T/F5,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF8570T/F5,518 is usually 5 days.

3.What payment methods are accepted for PCF8570T/F5,518?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF8570T/F5,518 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCF8570T/F5,518?

PCF8570T/F5,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCF8570T/F5,518 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/F5,518?

For technical support, including PCF8570T/F5,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF8570T/F5,518 requirements.

6.How does Aetrix verify that PCF8570T/F5,518 is sourced from the original manufacturer or authorized distributors?

All PCF8570T/F5,518 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/F5,518 meets industry standards.

7.What is the process for return or replacement of PCF8570T/F5,518?

All PCF8570T/F5,518 units undergo pre-shipment inspection (PSI). If there is an issue with PCF8570T/F5,518, 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/F5,518 part is unused and in its original packaging.

Return procedure for PCF8570T/F5,518:

1.Submit a request within 90 days.

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

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