Cypress Semiconductor Corp CY7C1312KV18-250BZXI

Overview

CY7C1312KV18-250BZXI from Cypress Semiconductor is a 1M × 18 (18-Mbit), 1.8 V QDR® II SRAM with separate read/write ports, 250 MHz operation (4 ns clock period), two-word burst architecture, and DDR interfaces delivering 500 MB/s bandwidth. It supports concurrent read/write transactions in high-speed networking buffers, packet classification engines, and FPGA co-processor memory subsystems.

For engineers reviewing the CY7C1312KV18-250BZXI datasheet, CY7C1312KV18-250BZXI pinout, CY7C1312KV18-250BZXI application, or CY7C1312KV18-250BZXI equivalent, key selection criteria include its 1.8 V core / 1.4–1.8 V I/O supply, 165-ball FBGA package, DOFF-configurable 1-cycle vs. 1.5-cycle read latency, and echo-clock–assisted data capture for >500 MHz effective data rates.

Technical Context

This QDR II SRAM implements true dual-port synchronous pipelined access: independent K/K clocks latch write addresses and data on rising edges, while C/C clocks drive read outputs with echo clocks (CQ/CQ) aligned to output timing. The device uses internal self-timed write circuitry and multiplexed address bus latching on alternating K/K edges.

It delivers full data coherency with no bus turnaround, supports depth expansion via RPS/WPS controls, and integrates JTAG 1149.1 boundary scan and programmable ZQ impedance matching. The DOFF pin selects between QDR I–compatible 1-cycle latency (LOW) and optimized QDR II 1.5-cycle latency (HIGH).

Key Specifications

Pinout & Package

The CY7C1312KV18-250BZXI is housed in a 165-ball Fine-Pitch Ball Grid Array (FBGA) package measuring 13 mm × 15 mm × 1.4 mm, compliant with JEDEC MO-245. Pin assignments follow a defined ball map with dedicated differential clock inputs, echo clocks, byte write selects, and multiplexed address/data control signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C33128A-250BIN and IS61WV102418BLL-250BLI, the CY7C1312KV18-250BZXI uniquely delivers true concurrent access, echo-clock–assisted timing closure, and 500 MB/s bandwidth-making it irreplaceable in high-throughput, low-latency memory subsystems requiring deterministic dual-port behavior.

Availability

CY7C1312KV18-250BZXI is available at Aetrix Electronics and suitable for high-speed network packet buffers, FPGA-based protocol accelerators, and telecom baseband processing requiring stable component supply and long-term industrial availability.

Supply support for CY7C1312KV18-250BZXI 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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The CY7C1312KV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for deterministic, high-bandwidth memory interfacing in networking infrastructure and real-time signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C1312KV18-250BZXI?

The DOFF (Double-Off) pin configures read latency mode: when asserted HIGH, it enables QDR II operation with 1.5-cycle read latency for optimized bandwidth; when LOW or tied to VSS, it reverts to QDR I–compatible 1-cycle latency. This setting directly affects controller pipeline staging and must be fixed at power-up.

Can CY7C1312KV18-250BZXI operate with only one clock domain?

Yes - the device supports single-clock mode where K and C are tied together (and K and C likewise), eliminating need for separate clock pairs. In this mode, all timing references derive from K/K, and echo clocks CQ/CQ track K/K instead of C/C, simplifying board layout at minor bandwidth cost.

How does ZQ pin calibration work in practice?

The ZQ pin connects to an external precision resistor (typically 240 Ω) to ground, allowing the device to calibrate its HSTL output drivers to match system trace impedance. This adjusts drive strength to maintain signal integrity at 500 MB/s; connecting ZQ directly to VDDQ enables minimum impedance mode for short traces.

Is CY7C1312KV18-250BZXI pin-compatible with other QDR II devices in the same family?

Yes - CY7C1312KV18-250BZXI shares identical 165-ball FBGA pinout and signal mapping with CY7C1312KV18-300BZXI and CY7C1312KV18-333BZXI, differing only in speed grade and AC timing specifications. This enables drop-in replacement within the same speed bin and layout reuse across performance tiers.