Infineon Technologies CY7C1313KV18-250BZCT

Overview

CY7C1313KV18-250BZCT from Cypress Semiconductor is a 1 M × 18, 18-Mbit QDR® II SRAM with separate read/write ports, 250 MHz operation (40 ns clock period), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers 3.6 Gbps bandwidth via DDR interfaces on both ports using four-word burst transfers and supports concurrent read/write transactions in high-speed networking and packet buffering applications.

For engineers reviewing the CY7C1313KV18-250BZCT datasheet, CY7C1313KV18-250BZCT pinout, CY7C1313KV18-250BZCT application, or CY7C1313KV18-250BZCT equivalent, key selection considerations include its 1M×18 organization, 165-ball FBGA package, DOFF-controlled 1-cycle vs. 1.5-cycle read latency, echo clock (CQ) support for timing margin, and HSTL-compatible variable-drive outputs.

Technical Context

This QDR II SRAM implements dual independent synchronous ports with pipelined address latching on alternating K-clock edges, enabling true concurrency without bus turnaround. Read and write data paths are fully separated-D[17:0] inputs and Q[17:0] outputs operate at double data rate using dedicated C/C̄ and K/K̄ clocks.

The device uses on-chip PLL for precise data placement and supports programmable impedance via ZQ pin. Its depth expansion capability relies on RPS/WPS controls, while byte write select (BWS[1:0]) enables partial writes to 9-bit subwords within the 18-bit data path-critical for efficient packet header updates.

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, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C1313KV18-250BZCT uniquely balances 250 MHz QDR II performance, HSTL compatibility, echo-clock timing aid, and 1.8 V core efficiency - making it optimal for mid-bandwidth packet buffering where LVDS complexity is unnecessary and single-port latency is unacceptable.

Availability

CY7C1313KV18-250BZCT is available at Aetrix Electronics and suitable for packet buffering in enterprise switches, network processor cache subsystems, LTE baseband synchronization, and high-speed test equipment requiring stable component supply and long-term industrial availability.

Supply support for CY7C1313KV18-250BZCT 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 systems, with emphasis on signal integrity and timing precision.

CY7C1313KV18 belongs to the 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 DOFF pin on CY7C1313KV18-250BZCT?

The DOFF (Data Output OFFset) pin selects read latency mode: when asserted LOW, it configures the device for 1-cycle read latency (QDR I compatibility); when HIGH, it enables 1.5-cycle latency for optimized QDR II throughput. This setting directly affects controller pipeline depth and must be fixed at power-up.

How does the BWS[1:0] signal operate in the 18-bit configuration?

BWS[1:0] are active-low byte write select signals that divide the 18-bit data path into two 9-bit subwords: BWS0 controls D[8:0], and BWS1 controls D[17:9]. When either is deasserted, the corresponding 9-bit segment is masked during write operations, preserving existing data in those bits.

Can CY7C1313KV18-250BZCT operate with a single clock domain instead of differential K/K̄ and C/C̄?

Yes - the device supports single-ended clocking: K and C can be driven as single-ended signals (with K̄ and C̄ tied to VDD or VSS per datasheet guidelines), though differential operation is recommended for jitter reduction and timing margin at 250 MHz. Echo clocks remain functional in either mode.

What is the purpose of the ZQ pin and how is it used?

ZQ connects to an external 240 Ω resistor to ground for on-die termination calibration. It adjusts HSTL output driver impedance to match PCB trace characteristics, ensuring signal integrity across temperature and voltage variations - required before normal operation per datasheet power-up sequence.