Infineon Technologies CY7C1315BV18-167BZCT

Overview

CY7C1315BV18-167BZCT from Cypress Semiconductor is a 18-Mbit QDR-II SRAM with 512K × 36 organization, 167 MHz maximum operating frequency, 1.8 V core supply (±0.1 V), and 1.4–1.8 V I/O supply (VDDQ). It features separate read/write ports, DDR interfaces on both ports (300 MHz clock → 600 Mbps data rate), and echo clocks (CQ/CQ) for high-speed data capture in networking packet buffers.

For engineers reviewing the CY7C1315BV18-167BZCT datasheet, CY7C1315BV18-167BZCT pinout, CY7C1315BV18-167BZCT application, or CY7C1315BV18-167BZCT equivalent, key selection criteria include burst depth (4-word), byte write select support (BWS[3:0]), FBGA-165 package compatibility, and DLL-assisted timing alignment for deterministic setup/hold margins at 300 MHz system clocks.

Technical Context

The device implements a synchronous pipelined QDR-II architecture with independent read and write data paths-eliminating bus turnaround and enabling concurrent access. Address latching occurs on alternating rising edges of K/K clocks, while read data is output-synchronized to C/C clocks with echo clocks (CQ/CQ) referenced to C for PCB flight-time compensation.

All inputs (RPS, WPS, BWS[3:0], A[16:0], D[35:0]) are registered on K/K rising edges; all outputs (Q[35:0], CQ, CQ) are registered on C/C rising edges. Internal self-timed writes ensure consistent write latency, and the Delay Lock Loop (DLL) aligns internal timing to minimize jitter-induced skew across the 36-bit data bus.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm, RoHS-compliant lead-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1315BV18-200BZCT, this part trades 33 MHz clock headroom for lower power and relaxed timing closure; versus AS7C331024B-167BIN, it delivers true concurrent access and deterministic DDR timing-but requires more complex clock routing and controller logic.

Availability

CY7C1315BV18-167BZCT is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, telecom baseband processing, and ATE pattern memory applications requiring stable component supply and long-term industrial availability.

Supply support for CY7C1315BV18-167BZCT 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 communications, computing, and industrial systems, with emphasis on signal integrity and timing precision.

This device belongs to the QDR-II SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory subsystems in networking infrastructure and high-speed test equipment.

FAQ

What is the function of the ZQ pin on CY7C1315BV18-167BZCT?

The ZQ pin is an output impedance calibration input. When connected to a precision resistor (RQ) tied to ground, it tunes the output driver impedance of Q[35:0], CQ, and CQ to 0.2×RQ. This ensures matched termination to the PCB trace impedance, minimizing reflections and improving signal integrity on high-speed 36-bit buses. Direct connection to VDDQ enables minimum-impedance mode.

Does CY7C1315BV18-167BZCT support single-clock-domain operation?

Yes. The device supports single-clock-domain operation where K and C are driven by the same clock source, and K and C are tied together. In this mode, all input registration uses K/K, and all output registration uses K/K as the timing reference. The DLL remains active to maintain internal timing alignment, and echo clocks (CQ/CQ) derive from K instead of C.

How many address bits are required for CY7C1315BV18-167BZCT's 512K × 36 organization?

17 address bits (A[16:0]) are required. Internally organized as four 128K × 36 arrays, the device uses multiplexed addressing: the same 17-bit bus serves both read and write ports, with port selection (RPS/WPS) and clock edge (K/K alternation) determining access destination. No external address demultiplexing is needed.

Can BWS[3:0] be used to write individual 9-bit nibbles within a 36-bit word?

No. BWS[3:0] are byte write selects, each controlling a distinct 9-bit segment: BWS0 → D[8:0], BWS1 → D[17:9], BWS2 → D[26:18], BWS3 → D[35:27]. They do not support finer-grained (e.g., 4-bit) nibble writes. Deasserting any BWS line causes its corresponding 9-bit segment to retain prior content during the write cycle.