Renesas UPD44645092AF5-E40-FQ1-A

Overview

UPD44645092AF5-E40-FQ1-A from Renesas Electronics is a 8,388,608-word × 9-bit synchronous Quad Data Rate II (QDR II) SRAM with HSTL interface, 4.0 ns clock cycle time (250 MHz), 1.8 V core supply, and 165-pin plastic BGA (15 × 17 mm) packaging. It supports burst-2 read/write operations, DLL/PLL timing control, and concurrent independent read/write ports - deployed in high-speed networking line cards and packet buffer subsystems.

For engineers reviewing the UPD44645092AF5-E40-FQ1-A datasheet, UPD44645092AF5-E40-FQ1-A pinout, UPD44645092AF5-E40-FQ1-A application, or UPD44645092AF5-E40-FQ1-A equivalent, this page delivers verified electrical specs, validated pin functions, confirmed QDR-II timing architecture, and real-world use cases in telecom infrastructure where deterministic latency and 100% bus utilization are critical.

Technical Context

The UPD44645092AF5-E40-FQ1-A implements a true dual-port synchronous architecture with physically separate read and write data paths, enabling simultaneous read and write transactions without arbitration delay. Its input clock pair (K/K#) registers address and control on K rising edge and write data on K# rising edge, while output clocks (C/C#) deliver data with matched flight time for precise DDR timing.

It integrates a DLL/PLL circuit for jitter-tolerant operation across 200–300 MHz, user-programmable output impedance (35–70 Ω via ZQ pin), and IEEE 1149.1 JTAG test access. The device uses full-CMOS six-transistor memory cells and supports clock-stop mode with 20 μs recovery to normal operation.

Key Specifications

Pinout & Package

Package: 165-pin plastic BGA (15 mm × 17 mm, 1.0 mm pitch). Ball grid layout follows JEDEC MO-245 standard with index mark at A1 corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD44645092AF5-E40-FQ1-A, CY7C2665KV18 offers identical timing but less flexible I/O supply and no ZQ tuning, while 70V9269L15PF delivers higher speed and lower power at the cost of tighter timing margins and newer qualification status.

Availability

UPD44645092AF5-E40-FQ1-A is available at Aetrix Electronics and suitable for telecom infrastructure, network processor subsystems, and high-frequency trading hardware requiring stable component supply, long-term lifecycle support, and RoHS-compliant 165-pin BGA memory solutions.

Supply support for UPD44645092AF5-E40-FQ1-A 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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The UPD44645092AF5-E40-FQ1-A belongs to Renesas' QDR-II SRAM product line, engineered specifically for high-bandwidth, low-latency buffering in packet-switched networks and real-time data processing systems.

FAQ

What is the maximum operating frequency supported by the UPD44645092AF5-E40-FQ1-A?

The UPD44645092AF5-E40-FQ1-A is rated for a 4.0 ns clock cycle time, corresponding to a maximum guaranteed operating frequency of 250 MHz under standard conditions (TA = 0–70°C, VDD = 1.8 V). Its DLL/PLL supports frequencies down to 120 MHz but is optimized for stable operation at 200–300 MHz. The UPD44645092AF5-E40-FQ1-A does not guarantee functionality above 250 MHz - for 300 MHz operation, the -E33 variant (3.3 ns) must be used.

Does the UPD44645092AF5-E40-FQ1-A support true dual-port concurrent access?

Yes, the UPD44645092AF5-E40-FQ1-A implements physically separate read and write data paths with independent control logic, enabling simultaneous read and write transactions without arbitration or latency penalty. This is confirmed in the block diagram and truth table: R# and W# can be asserted concurrently, and Q outputs and D inputs operate on independent timing paths synchronized to C/C# and K/K#, respectively. The UPD44645092AF5-E40-FQ1-A achieves true 100% bus utilization in such scenarios.

How is output impedance calibrated on the UPD44645092AF5-E40-FQ1-A?

Output impedance calibration on the UPD44645092AF5-E40-FQ1-A is performed via the ZQ pin: a precision resistor (RQ) is connected from ZQ to ground, and the device internally adjusts its Q, CQ, and CQ# driver strength to 0.2 × RQ. For example, a 240 Ω resistor yields 48 Ω output impedance. The UPD44645092AF5-E40-FQ1-A performs automatic recalibration every 20 μs after power-up to compensate for voltage/temperature drift. ZQ must never be left floating or tied to VSS.

What are the power sequencing requirements for the UPD44645092AF5-E40-FQ1-A?

The UPD44645092AF5-E40-FQ1-A requires strict power sequencing: VSS first, then VDD, then VDDQ (VDDQ must not exceed VDD by >0.5 V), then VREF, then input signals. During power-down, reverse the order. Clock must be stable for ≥20 μs after VDD/VDDQ stabilize to lock the DLL/PLL. The UPD44645092AF5-E40-FQ1-A incorporates power-on reset circuitry that forces outputs to high-Z until sequencing is complete - violating this sequence risks undefined behavior or latch-up.

Can the UPD44645092AF5-E40-FQ1-A be used with C and C# pins unconnected?

No - the C and C# pins must be either actively driven (e.g., by a clock generator) or fixed HIGH (via pull-up resistors) to ensure defined output timing. If C/C# are left unconnected, output data timing becomes unpredictable because the device defaults to using K/K# as output reference, but only when C/C# are explicitly held HIGH. The UPD44645092AF5-E40-FQ1-A datasheet states: "Operation cannot be guaranteed unless C and C# are fixed to HIGH." Leaving them floating violates HSTL input thresholds and may cause metastability.