Infineon Technologies CY7C1312BV18-167BZCT

Overview

CY7C1312BV18 from Cypress Semiconductor is a 1M × 18-bit, 18-Mbit QDR-II SRAM with separate read/write ports, 250 MHz clock support (167 MHz speed grade), DDR interfaces on both ports, and 165-ball FBGA (13 × 15 × 1.4 mm) packaging. It delivers 500 MT/s effective data rate per port and operates at core VDD = 1.8 V ±0.1 V with IO VDDQ = 1.4–1.8 V. Used in high-speed packet buffering for network switches and routers.

For engineers reviewing the CY7C1312BV18 datasheet, CY7C1312BV18 pinout, CY7C1312BV18 application, or CY7C1312BV18 equivalent, key selection criteria include burst depth (2-word), synchronous self-timed writes, echo clocks (CQ/CQ) for timing margin recovery, HSTL-18 I/O compatibility, and JTAG 1149.1 test access support.

Technical Context

The CY7C1312BV18 implements QDR-II architecture with fully independent read and write pipelines-each latching address on rising edges of dedicated K (write) and K (read) clocks. All synchronous inputs are registered to K/K, while output data Q[17:0] is edge-aligned to C/C clocks, enabling precise DDR capture without bus turnaround.

It integrates a Delay Lock Loop (DLL) for accurate internal data placement and supports echo clocks CQ/CQ referenced to C/C for deskewing across PCB traces. Write operations use on-chip self-timed control with BWS[1:0] byte-select capability, ensuring coherency and eliminating read-modify-write overhead in burst-access systems.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, Pb-free and non-Pb-free options available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418BLL-167BLI, the CY7C1312BV18 uniquely delivers burst-aligned DDR throughput with integrated DLL and echo clocks-critical for maintaining timing closure in multi-Gbps packet-processing systems where flight-time variation exceeds 100 ps.

Availability

CY7C1312BV18 is available at Aetrix Electronics and suitable for network switching, telecom line card design, high-speed test instrumentation, and FPGA-based accelerator development requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1312BV18 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance memory and programmable solutions for networking, automotive, and industrial applications, with emphasis on signal integrity and timing precision.

This device belongs to Cypress's QDR-II SRAM product line, engineered specifically for deterministic, low-latency, concurrent memory access in packet-switched infrastructure where bus turnaround overhead must be eliminated.

FAQ

What is the function of the ZQ pin on CY7C1312BV18?

The ZQ pin connects to an external resistor to ground to calibrate the output driver impedance of Q[17:0], CQ, and CQ pins to match the system's 50 Ω data bus. When tied to VDDQ, it enables minimum-impedance mode. It must never be left floating or connected to VSS, as this disables impedance tuning and risks signal integrity failure.

Can CY7C1312BV18 operate with only one clock (K) instead of K/K and C/C pairs?

Yes-the device supports single-clock mode where K serves as both read and write address clock, and K drives output data. In this configuration, C and C are unused, and CQ/CQ derive from K. However, deskew capability and timing margin are reduced compared to dual-clock operation, limiting reliable operation above 133 MHz.

How does the BWS[1:0] signal affect write operations in CY7C1312BV18?

BWS[1:0] controls 9-bit byte granularity: BWS0 enables writing to D[8:0], BWS1 to D[17:9]. Both must be asserted for full 18-bit writes. When one is deasserted, the corresponding byte remains unchanged-preserving prior data without requiring read-modify-write sequences, essential for atomic updates in packet header fields.

Is the DOFF pin required to be connected for normal operation?

No-DOFF is optional. When left unconnected or pulled HIGH, the internal DLL remains active, ensuring optimal data-to-clock alignment. Only connect DOFF to GND if DLL-induced jitter or power consumption must be traded for simplified timing analysis in ultra-low-jitter systems where external clock alignment is handled elsewhere.