Renesas UPD44325362BF5-E40-FQ1

Overview

UPD44325362BF5-E40-FQ1 from Renesas Electronics is a 1,048,576-word × 36-bit synchronous Quad Data Rate II (QDR II) SRAM with 4.0 ns clock cycle time (250 MHz), HSTL interface, 1.8 V core supply, and 165-pin plastic BGA (15 × 17 mm) packaging. It supports concurrent read/write operations, two-word burst, and PLL-based output timing control for high-speed networking buffer applications.

For engineers reviewing the UPD44325362BF5-E40-FQ1 datasheet, UPD44325362BF5-E40-FQ1 pinout, UPD44325362BF5-E40-FQ1 application, or UPD44325362BF5-E40-FQ1 equivalent, key selection considerations include its 36-bit wide DDR interface, user-programmable output impedance (35–70 Ω), echo clock outputs (CQ/CQ#), JTAG 1149.1 test port, and clock-stop capability with 20 μs recovery.

Technical Context

This QDR II SRAM uses full-CMOS six-transistor memory cells and integrates dual-clock synchronous logic: K/K# for address/control/data input registration and C/C# for precise output data timing. Its architecture enables simultaneous independent read and write ports with 100% bus utilization in DDR mode.

The device implements an on-die PLL for jitter-tolerant operation and wide data-valid windows, supports byte-write masking via four BW# signals (BW0#–BW3#), and delivers synchronized echo clocks (CQ/CQ#) tightly matched to output data edges-critical for source-synchronous timing in high-speed packet buffers and FPGA interconnects.

Key Specifications

Pinout & Package

UPD44325362BF5-E40-FQ1 is housed in a 165-pin plastic BGA (15 × 17 mm grid, ball pitch 0.8 mm), with power/ground distributed across interior rows and high-speed I/O (D/Q/CQ/C/C#/K/K#/R#/W#/BW0#–BW3#) placed on perimeter for optimal signal routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR II SRAM applications.

Compared with CY7C2663KV18-400BZXC and AS7C336256P-15JIN, UPD44325362BF5-E40-FQ1 delivers optimal balance of 250 MHz performance, source-synchronous timing (CQ/CQ#), and industrial temperature support-enabling robust data-path implementation without added timing compensation circuitry.

Availability

UPD44325362BF5-E40-FQ1 is available at Aetrix Electronics and suitable for high-speed network packet buffering, FPGA-to-ASIC interconnect caching, and telecom baseband processing requiring stable component supply across production lifecycles.

Supply support for UPD44325362BF5-E40-FQ1 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The UPD44325362BF5-E40-FQ1 belongs to Renesas' QDR II SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory interfacing in networking and signal processing systems operating at 200–300 MHz.

FAQ

What is the maximum supported clock frequency for UPD44325362BF5-E40-FQ1?

The UPD44325362BF5-E40-FQ1 is rated for 250 MHz operation with a 4.0 ns clock cycle time. While faster variants (e.g., -E33/-E35) support up to 300 MHz, this specific part is characterized and guaranteed for stable timing only at ≤250 MHz across 0–70°C ambient temperature. Exceeding this frequency violates AC timing specifications and may cause data corruption.

Does UPD44325362BF5-E40-FQ1 support true concurrent read and write operations?

Yes, UPD44325362BF5-E40-FQ1 features physically separate read and write data ports (Q0–Q35 and D0–D35) and independent control logic, enabling simultaneous read and write transactions without arbitration delay. This is confirmed in the block diagram (Page 9) and truth table (Page 11), where R# and W# can be asserted concurrently.

How is output impedance calibrated on UPD44325362BF5-E40-FQ1?

Output impedance for Q, CQ, and CQ# drivers is calibrated using the ZQ pin. A resistor (175–350 Ω) is connected from ZQ to ground; the device measures this resistance and sets output drive strength to 0.2 × RQ. Calibration occurs automatically every 20 μs after power-up and tracks supply/temperature drift-no software intervention required.

Can UPD44325362BF5-E40-FQ1 operate without the internal PLL?

Yes-asserting DLL# = LOW disables the PLL and forces the device to operate using raw K/K# timing. However, AC/DC characteristics are not guaranteed in this mode, and it is intended only for low-frequency debugging. For normal 250 MHz operation, DLL# must be HIGH (tied to VDDQ via ≤10 kΩ resistor) to ensure PLL lock and jitter-tolerant timing.

What is the purpose of the CQ and CQ# pins on UPD44325362BF5-E40-FQ1?

CQ and CQ# are echo clock outputs synchronized to Q0–Q35 data edges. Their rising edges align tightly with data valid windows-providing the receiving device (e.g., FPGA) with a source-synchronous timing reference that compensates for PCB trace skew. This eliminates the need for static timing analysis or delay-locked loops on the receiver side.