Infineon Technologies CY7C1387D-167AXC

Overview

CY7C1387D-167AXC from Infineon Technologies is a 2-Mbit (128K × 16) synchronous static RAM (SSRAM) with QDR™ II architecture, supporting 167 MHz double-data-rate operation, 3.3 V core/interface voltage, and burst-length-4 read/write capability. It serves as high-speed buffer memory in network packet processing, baseband signal handling, and FPGA co-processor data staging.

For engineers reviewing the CY7C1387D-167AXC datasheet, CY7C1387D-167AXC pinout, CY7C1387D-167AXC application, or CY7C1387D-167AXC equivalent, key selection criteria include QDR-II timing compliance, 16-bit bidirectional data bus support, differential clock pair handling, and flow-through latency mode for deterministic pipeline access in telecom switching fabric designs.

Technical Context

This QDR-II SSRAM implements separate read and write data buses (DQ and DQ_R) to enable concurrent read/write operations without bus turnaround delay. It uses a differential clock pair (K/K#) to latch address and control signals on both edges, achieving effective 334 MT/s throughput.

The device supports two latency modes-flow-through (1.5-cycle read latency) and registered (2.5-cycle), selectable via Mode Register Set (MRS) command. Internal self-timed write cycles eliminate external write pulse width constraints, and programmable burst termination allows partial-word writes within a burst sequence.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1387D-167AXC, the BXC variant adds industrial temperature support without performance trade-offs, while the AS7C3256A offers higher density at identical speed but requires PCB and firmware rework - making the AXC optimal for commercial telecom gear with fixed 2-Mbit buffering needs.

Availability

CY7C1387D-167AXC is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and FPGA co-processor cache applications requiring stable component supply across multi-year production cycles.

Supply support for CY7C1387D-167AXC 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, security solutions, and high-performance memory products.

CY7C1387D belongs to Infineon's QDR™ II SSRAM product line, engineered specifically for deterministic, high-throughput data buffering in telecom infrastructure, networking ASICs, and FPGA-based signal processing systems.

FAQ

What is the difference between flow-through and registered latency modes?

Flow-through mode delivers read data 1.5 clock cycles after address assertion, enabling minimal latency for time-critical applications like packet classification. Registered mode inserts an additional register stage, increasing latency to 2.5 cycles but improving timing margin and signal integrity in electrically noisy or long-trace layouts. Selection is done via Mode Register Set command and affects all subsequent read operations until reconfigured.

Does CY7C1387D-167AXC support burst termination mid-sequence?

Yes - the device supports burst termination after 1, 2, 3, or 4 words using the BW# (burst wrap) signal in conjunction with ADSP#/ADSC#. This allows partial writes to match variable-length packet payloads without forcing full 4-word bursts, reducing bus utilization and power consumption in burst-limited traffic scenarios such as VoIP or IoT sensor aggregation.

Can K and K# be driven by a single-ended clock source?

No - K and K# must be driven differentially with 100 Ω termination between them. Using a single-ended source violates AC timing specifications and causes excessive skew, leading to setup/hold violations and read data corruption. A dedicated differential clock generator or transformer-coupled source is required to meet t_SK(K–K#) < 50 ps skew specification.

Is there a direct drop-in replacement for CY7C1387D-167AXC in the same package?

No - no pin-compatible, functionally identical replacement exists from other manufacturers. The CY7C1387D-167BXC is the only direct variant (same pinout, same timing, extended temp range). Cross-manufacturer alternatives like AS7C3256A require PCB redesign due to differing pin assignments, MRS command structure, and power sequencing requirements - not plug-and-play replacements.