Infineon Technologies CY7C1382B-133AC

Overview

CY7C1382B-133AC from Cypress Semiconductor is a 1-Mbit (1,048,576 × 18) synchronous pipelined SRAM with 133 MHz clock speed, 4.2 ns OE access time, and JEDEC JESD8-5-compliant I/O. It implements burst-address generation via internal 2-bit counter, supports linear/interleaved burst modes via MODE pin, and delivers high-bandwidth cache memory for Pentium®-compatible processors in embedded computing systems.

For engineers reviewing the CY7C1382B-133AC datasheet, CY7C1382B-133AC pinout, CY7C1382B-133AC application, or CY7C1382B-133AC equivalent, key selection criteria include synchronous burst timing compliance, byte-write granularity (BWa/BWb), ZZ sleep mode behavior, and TQFP-100 package compatibility with depth-expansion pipelines.

Technical Context

This SRAM uses single-layer polysilicon, triple-metal CMOS technology with six-transistor memory cells. All synchronous inputs - address (A[19:0]), CE1/CE2/CE3, GW, BWE, BWa/BWb, ADSP/ADSC, ADV, MODE - are registered on the rising edge of CLK. Asynchronous OE and ZZ control output enable and low-power sleep independently of clock timing.

Burst addressing is managed by an internal wraparound 2-bit counter loaded from A[1:0] at ADSP/ADSC assertion. Linear or interleaved burst sequence is selected statically via MODE pin (GND = linear, VDDQ/floating = interleaved), and ADV advances the counter synchronously. Write cycles are self-timed and support 1–4 byte widths depending on active BWa/BWb and BWE state.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), 14 mm × 14 mm, 0.5 mm pitch, lead-free (RoHS-compliant). Thermal pad exposed on bottom for enhanced heat dissipation in high-frequency operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV102418AL-133TQLI, CY7C1382B-133AC delivers deterministic burst timing and lower latency via pipelined enables; versus CY7C1382D-133AXC, it trades JTAG and density for simpler layout and thermal management in TQFP form.

Availability

CY7C1382B-133AC is available at Aetrix Electronics and suitable for secondary cache memory, network packet buffering, real-time DSP data staging, and avionics display framestores requiring stable component supply across extended product lifecycles.

Supply support for CY7C1382B-133AC 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 industrial, automotive, and communications markets, with emphasis on reliability and timing precision.

The CY7C138x series targets high-speed synchronous cache and buffer applications where deterministic burst timing, low-latency OE access, and depth-expansion scalability are critical - especially in legacy x86 and real-time embedded systems.

FAQ

What is the function of the MODE pin on CY7C1382B-133AC?

The MODE pin selects burst address sequence: tied to GND for linear burst (A[19:0] increments sequentially), or to VDDQ/floating for interleaved burst (A0 toggles each cycle, matching Pentium® cache protocol). It is a static strap pin - must remain unchanged during operation to avoid undefined burst behavior.

Can CY7C1382B-133AC operate with a 2.5V I/O supply?

Yes - VDDQ accepts 2.5V ±5% to 3.3V +10%, enabling direct interface with 2.5V logic families. Core VDD remains fixed at 3.3V ±5%/+10%. This dual-rail design isolates I/O noise from memory array timing and supports mixed-voltage board architectures.

How does the ZZ pin affect data retention and power consumption?

When ZZ is driven HIGH, the device enters non-time-critical sleep mode with 20 mA standby current (per datasheet page 2), preserving all stored data indefinitely without clock or refresh. Outputs go high-impedance; all internal clocks halt except retention circuitry. Exit time is instantaneous upon ZZ LOW.

Is CY7C1382B-133AC pin-compatible with CY7C1380B-133AC?

No - CY7C1382B (1M × 18) uses 100-pin TQFP with DQa/DQb/DPa/DPb only, while CY7C1380B (512K × 36) has DQa–DQd/DPa–DPd and different pin assignments (e.g., CE2/CE3 present on CY7C1380B but unused on CY7C1382B). Pinouts are mutually incompatible despite shared family architecture.