Infineon Technologies CY7C1381C-100AC

Overview

CY7C1381C-100AC from Cypress Semiconductor is a 3.3V, 512K × 36-bit synchronous flow-through SRAM with 100-MHz clock support, 8.5 ns clock-to-output delay, JEDEC-standard 100-pin TQFP package, and dual VDD/VDDQ supply architecture. It serves as high-speed cache or buffer memory in Pentium-class microprocessor systems requiring burst-mode addressing, low-latency read/write cycles, and glueless interfacing.

For engineers reviewing the CY7C1381C-100AC datasheet, CY7C1381C-100AC pinout, CY7C1381C-100AC application, or CY7C1381C-100AC equivalent, key selection criteria include burst sequence control (linear/interleaved), synchronous write timing with GW/BWE/BWA–BWD byte enable logic, CE1/CE2/CE3 depth-expansion capability, and compatibility with 2.5V or 3.3V I/O voltage domains.

Technical Context

The CY7C1381C-100AC implements a synchronous, flow-through architecture with a 2-bit on-chip burst counter that auto-increments addresses during burst reads/writes. All address, data, and control inputs (ADSP, ADSC, ADV, CE1–CE3, BWx, BWE, GW) are registered on the rising edge of CLK, ensuring deterministic setup/hold timing.

It supports two asynchronous controls-OE for output tri-state management and ZZ for non-time-critical sleep mode-with internal pull-down on ZZ and internal pull-up on MODE. The device uses separate core (VDD = 3.3V ±5%/+10%) and I/O (VDDQ = 2.5V or 3.3V) supplies, with JESD8-5-compliant input thresholds and output drive strength.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), 14 × 14 mm body, 0.5 mm pitch, RoHS-compliant, JEDEC MO-140 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1381C-100AC, the CY7C1381D-100AC offers enhanced reliability across temperature extremes without design change, while the IS61WV102436BLL-100BLI trades pin compatibility and flexible I/O voltage support for higher density-making it suitable only when capacity outweighs integration simplicity.

Availability

CY7C1381C-100AC is available at Aetrix Electronics and suitable for high-speed CPU cache subsystems, network packet buffering, industrial motion control, and medical imaging frame storage requiring stable component supply, long-lifecycle support, and consistent parametric performance.

Supply support for CY7C1381C-100AC 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 U.S.-based semiconductor company specializing in high-performance memory, PSoC programmable systems-on-chip, and USB/USB-C solutions.

The CY7C1381C belongs to Cypress's synchronous SRAM product line, engineered specifically for glueless interfacing with x86 and RISC microprocessors requiring burst-mode, low-latency, flow-through memory access in compute- and communications-intensive systems.

FAQ

What is the function of the MODE pin on CY7C1381C-100AC?

The MODE pin selects burst sequence type: tied HIGH (or left floating, due to internal pull-up) enables Intel Pentium-style interleaved bursts (0,2,4,6,… then 1,3,5,7,…), while tied LOW selects linear bursts (0,1,2,3,…). It is a static configuration pin-must not toggle during operation-and directly controls the on-chip 2-bit burst counter's increment logic.

Can CY7C1381C-100AC operate with 2.5V I/O while maintaining 3.3V core supply?

Yes. The device supports independent VDD (3.3V ±5%/+10%) and VDDQ (2.5V or 3.3V) supplies. When VDDQ = 2.5V, all DQ/DQP outputs swing between 0V and 2.5V, and inputs meet JESD8-5 thresholds for 2.5V logic families-enabling direct interface with FPGA or ASIC I/O banks running at 2.5V without level shifters.

How does the ZZ sleep mode affect data retention and wake-up timing?

In ZZ mode (pin driven HIGH), the device enters a low-power state where internal clocks halt but SRAM cell data is retained indefinitely as long as VDD remains within specification. Wake-up is asynchronous: asserting ZZ LOW restores full operation within one CLK cycle-no additional stabilization delay is required before issuing the next command.

Is the CY7C1381C-100AC pin-compatible with CY7C1383C-100AC?

No. Although both share the 100-pin TQFP package and many signal names, CY7C1383C is a 1M × 18-bit device with different address pin count (A0–A19), reduced DQ count (18 vs. 36), and no DQPA–DQPD parity lines. Pinouts differ significantly-especially in data, address, and byte-write signal allocation-making them electrically and logically incompatible.