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

Renesas 70V3399S166BF

Name: 70V3399S166BF
Brand: Renesas
SKU: 70V3399S166BF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 70V3399S166BF

Manufacturer:: Renesas

Category:: Memory

Package:: 208-LFBGA

Datasheet:: 70V3399S166BF.pdf

Description:: IC SRAM 2MBIT PARALLEL 208CABGA

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Product details

Overview

70V3399S166BF from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port SRAM with true dual-port architecture enabling simultaneous read/write access to the same memory location from independent left and right ports. It operates at 166MHz (6ns cycle time), delivers 6Gbps aggregate bandwidth, supports selectable 3.3V or 2.5V I/O interfaces per port, and features pipelined output mode only (no flow-through due to TQFP pin count limitation). It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70V3399S166BF datasheet, 70V3399S166BF pinout, 70V3399S166BF application, or 70V3399S166BF equivalent, key selection criteria include guaranteed 166MHz operation under commercial temperature, dual chip enables for depth expansion, separate byte controls for bus matching, JTAG compliance (not supported in this TQFP variant), and LVTTL-compatible 3.3V core with configurable I/O voltage per port.

Technical Context

The 70V3399S166BF implements full synchronous operation on both ports with registered address, data, and control inputs-enabling minimal setup (1.7ns) and hold (0.5ns) times at 166MHz. Its self-timed write architecture ensures fast cycle time without external timing constraints.

It integrates dual independent address counters with counter enable (CNTEN) and repeat (REPEAT) functions per port, allowing burst-mode sequential addressing without external logic. The device uses true dual-port memory cells-not pseudo-dual-port-so concurrent access to identical addresses is collision-free and deterministic.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K × 18 bits (4.5 Mbit total); supports independent 18-bit bidirectional data paths on left and right ports
Max Clock Frequency	166 MHz (6 ns cycle time); validated for commercial temperature range (0°C to +70°C)
Access Time	3.6 ns clock-to-data-out (tCD2) in pipelined mode; enables sub-6ns system-level memory latency
I/O Voltage Support	Selectable 3.3V (±150 mV) or 2.5V (±100 mV) per port via OPTL/OPTR pins; VDD core fixed at 3.3V
Operating Temperature	Commercial grade only: 0°C to +70°C; industrial grade (–40°C to +85°C) limited to 133MHz version
Power Supply	VDD = 3.3V ±150 mV; VDDQL/VDDQR independently set to 3.3V or 2.5V based on OPT pin state
Dynamic Current	Typical 370 mA (max 500 mA) at 166MHz with both ports active and outputs disabled

Pinout & Package

70V3399S166BF is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size ≈14 mm × 20 mm × 1.4 mm. JTAG and PL/FT mode are not supported due to pin count limitations; device operates exclusively in pipelined output mode on both ports.

Pin/Terminal	Circuit Role	Design Meaning
CLKL / CLKR	Port-synchronous clock input	Registers all address, data, and control signals on rising edge; determines timing reference for each port independently
CE0L/CE1L, CE0R/CE1R	Dual chip enables per port	Enable depth expansion without external logic: CE0X = VIL & CE1X = VIH activates port X
R/WL / R/WR	Read/write control	Synchronous signal sampled on CLK edge; defines direction of data transfer for current cycle
OEL / OER	Asynchronous output enable	Controls output drivers independently; high-Z when asserted, regardless of clock or other controls
UBL/LBL, UBR/LBR	Upper/lower byte enables	Enable 9-bit upper (I/O9–I/O17) or 9-bit lower (I/O0–I/O8) byte per port; support multiplexed bus interfacing
A0L–A16L, A0R–A16R	Address inputs	17-bit address bus per port; A17 is NC for 70V3399 (256K × 18 requires only A0–A16)
I/O0L–I/O17L, I/O0R–I/O17R	Bidirectional data I/O	18-bit parallel data path per port; electrically isolated between ports; voltage level set by VDDQX and OPTX
OPTL / OPTR	I/O voltage select	Set to VIH (3.3V) or VIL (0V) to configure corresponding port's I/O and control voltage level (3.3V or 2.5V)

Key Features

Feature	Design Value
True Dual-Port Memory Cells	Enables deterministic, collision-free simultaneous read/write access to identical memory locations from independent ports
Dual Independent Address Counters	Each port has dedicated CNTEN/REPEAT/ADSL/ADSR controls for autonomous burst addressing without external sequencer
Pipelined Output Mode Only	Guaranteed 3.6 ns tCD2 at 166MHz; eliminates flow-through timing uncertainty in TQFP package
Separate Per-Port I/O Voltage Control	OPTL/OPTR pins allow mixed-voltage system interfacing-e.g., left port at 3.3V to FPGA, right port at 2.5V to ASIC
Dual Chip Enables with Power-Down	CE0X = VIH or CE1X = VIL places port X into low-power standby (ISB1 ≤ 200 mA), reducing dynamic power in idle ports

Applications

Telecom Line Card Buffering	Network Packet Switching
Use Scenario: High-throughput packet buffering in OC-192/STM-64 line interface modules where ingress and egress data streams require concurrent access to shared memory. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency, non-blocking FIFO buffer-left port accepts incoming packets synchronously to line-rate clock, right port services switch fabric at independent frequency. Use Value: Eliminates arbitration logic and reduces packet jitter by enabling simultaneous write/read of same address, supporting deterministic 166MHz throughput per port.	Use Scenario: Shared memory for multi-stage packet classification engines in Layer 3 switches, where lookup tables and result caches must be accessed concurrently by multiple pipeline stages. IC Role / Device Role / Timing Role: Provides synchronized, low-latency memory resource for parallel TCAM assist and forwarding table lookups-left port serves classifier engine, right port feeds forwarding processor. Use Value: 6Gbps aggregate bandwidth and 3.6ns tCD2 ensure sub-cycle memory response, enabling single-clock-cycle table updates and lookups without pipeline stalls.
Real-Time DSP Co-Processing	Industrial Motion Controller Buffering
Use Scenario: Shared data exchange between host CPU and dedicated DSP in radar signal processing systems requiring phase-coherent sample buffering and FFT windowing. IC Role / Device Role / Timing Role: Acts as ping-pong buffer memory-left port writes raw ADC samples from FPGA, right port reads pre-processed blocks by DSP core at matched clock domain. Use Value: True dual-port architecture avoids memory contention during overlapping acquisition and computation phases, sustaining continuous 166MHz data streaming without dead cycles.	Use Scenario: Synchronized motion profile storage and execution in CNC controllers, where trajectory generation (host) and servo update (real-time core) access shared position/velocity tables. IC Role / Device Role / Timing Role: Provides deterministic, low-jitter memory interface-left port loaded by ARM-based motion planner, right port read by FPGA-based PWM generator at 100+ kHz update rate. Use Value: Pipelined output mode guarantees consistent 3.6ns read latency, enabling precise microsecond-level timing alignment between planning and actuation loops.

Telecom Line Card Buffering

Network Packet Switching

Use Scenario: High-throughput packet buffering in OC-192/STM-64 line interface modules where ingress and egress data streams require concurrent access to shared memory.

IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency, non-blocking FIFO buffer-left port accepts incoming packets synchronously to line-rate clock, right port services switch fabric at independent frequency.

Use Value: Eliminates arbitration logic and reduces packet jitter by enabling simultaneous write/read of same address, supporting deterministic 166MHz throughput per port.

Use Scenario: Shared memory for multi-stage packet classification engines in Layer 3 switches, where lookup tables and result caches must be accessed concurrently by multiple pipeline stages.

IC Role / Device Role / Timing Role: Provides synchronized, low-latency memory resource for parallel TCAM assist and forwarding table lookups-left port serves classifier engine, right port feeds forwarding processor.

Use Value: 6Gbps aggregate bandwidth and 3.6ns tCD2 ensure sub-cycle memory response, enabling single-clock-cycle table updates and lookups without pipeline stalls.

Real-Time DSP Co-Processing

Industrial Motion Controller Buffering

Use Scenario: Shared data exchange between host CPU and dedicated DSP in radar signal processing systems requiring phase-coherent sample buffering and FFT windowing.

IC Role / Device Role / Timing Role: Acts as ping-pong buffer memory-left port writes raw ADC samples from FPGA, right port reads pre-processed blocks by DSP core at matched clock domain.

Use Value: True dual-port architecture avoids memory contention during overlapping acquisition and computation phases, sustaining continuous 166MHz data streaming without dead cycles.

Use Scenario: Synchronized motion profile storage and execution in CNC controllers, where trajectory generation (host) and servo update (real-time core) access shared position/velocity tables.

IC Role / Device Role / Timing Role: Provides deterministic, low-jitter memory interface-left port loaded by ARM-based motion planner, right port read by FPGA-based PWM generator at 100+ kHz update rate.

Use Value: Pipelined output mode guarantees consistent 3.6ns read latency, enabling precise microsecond-level timing alignment between planning and actuation loops.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1362BV33-166AXC	166MHz 256K × 18, but uses QDR-II interface with separate read/write data buses; no true dual-port concurrency on same address	Requires protocol-aware controller; unsuitable for applications needing simultaneous read/write to identical location	Select only if system already uses QDR-II infrastructure and does not require true dual-port collision-free access
AS7C3256A-166JCIN	166MHz 256K × 18, asynchronous dual-port SRAM; no clocked interface, higher access latency (12ns), no pipelining or counters	Lacks synchronous timing control, counters, or byte enables-requires external handshake logic for burst transfers	Choose only for legacy designs where clock-domain isolation is unnecessary and lower bandwidth suffices

Compared with CY7C1362BV33-166AXC and AS7C3256A-166JCIN, the 70V3399S166BF uniquely delivers true dual-port concurrency, integrated address counters, and per-port I/O voltage flexibility-making it optimal for tightly coupled, high-determinism embedded systems where memory coherency and timing predictability are critical.

Availability

70V3399S166BF is available at Aetrix Electronics and suitable for telecom line card buffering, network packet switching, real-time DSP co-processing, and industrial motion controller buffering requiring stable component supply and long-term production continuity.

Supply support for 70V3399S166BF 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The 70V33xx family was designed specifically for high-bandwidth, low-latency synchronous dual-port memory applications in telecom infrastructure, test equipment, and real-time embedded systems requiring deterministic concurrent access.

FAQ

What is the maximum operating frequency of the 70V3399S166BF?

The 70V3399S166BF is rated for 166MHz operation (6ns cycle time) in the commercial temperature range (0°C to +70°C). This is confirmed by AC Electrical Characteristics Table 11 in the datasheet, which specifies tCYC2 = 6ns max for pipelined mode. Industrial temperature operation at 166MHz is not supported-the industrial-grade variant (70V3399S133BF) is limited to 133MHz.

Does the 70V3399S166BF support flow-through output mode?

No, the 70V3399S166BF does not support flow-through output mode. As explicitly stated in the datasheet (Pin Configuration Note #8 and Features section), the 128-pin TQFP package lacks sufficient pins to implement the FT/PIPE select function. The device operates exclusively in pipelined output mode on both left and right ports, delivering guaranteed 3.6ns clock-to-data-out (tCD2) at 166MHz.

What are the I/O voltage options for the 70V3399S166BF?

The 70V3399S166BF supports per-port selectable I/O voltage: 3.3V (±150mV) or 2.5V (±100mV), configured independently via OPTL and OPTR pins. When OPTL = VIH (3.3V), VDDQL must be supplied at 3.3V; when OPTL = VIL (0V), VDDQL must be 2.5V. The core VDD remains fixed at 3.3V. This allows mixed-voltage interfacing-for example, left port to a 3.3V FPGA and right port to a 2.5V ASIC.

Is JTAG debugging supported on the 70V3399S166BF?

No, JTAG is not supported on the 70V3399S166BF. The datasheet explicitly states in Pin Configuration Note #9 that "Due to the limited pin count, JTAG is not supported in the PKG128 package." While the device implements IEEE 1149.1-compliant JTAG logic internally, the TQFP package omits required pins (TCK, TMS, TDO, TDI, TRST), making boundary-scan or debug access impossible on this variant.

How does the 70V3399S166BF handle simultaneous access to the same memory address from both ports?

As a true dual-port SRAM, the 70V3399S166BF uses dedicated memory cells that permit fully independent, simultaneous read and write operations to the exact same memory address-one port can read while the other writes without conflict, arbitration, or data corruption. This is distinct from pseudo-dual-port or QDR architectures and is confirmed in the Functional Block Diagram and Features section of the datasheet.

70V3399S166BF Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 208-LFBGA

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Synchronous

Memory Size:: 2Mbit

Memory Organization:: 128K x 18

Memory Interface:: Parallel

Clock Frequency:: 166 MHz

Write Cycle Time - Word, Page:: -

Access Time:: 3.6 ns

Voltage - Supply:: 3.15V ~ 3.45V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 208-CABGA (15x15)

70V3399S166BF FAQ

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Please submit a Request for Quotation (RFQ) for 70V3399S166BF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

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The price and inventory of 70V3399S166BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V3399S166BF is usually 5 days.

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6.How does Aetrix verify that 70V3399S166BF is sourced from the original manufacturer or authorized distributors?

All 70V3399S166BF 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 70V3399S166BF meets industry standards.

7.What is the process for return or replacement of 70V3399S166BF?

All 70V3399S166BF units undergo pre-shipment inspection (PSI). If there is an issue with 70V3399S166BF, 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 70V3399S166BF part is unused and in its original packaging.

Return procedure for 70V3399S166BF:

1.Submit a request within 90 days.

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

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