Infineon Technologies CY7C1009B-12VC

Overview

CY7C1009B-12VC from Cypress Semiconductor is a 128K × 8 (131,072 × 8) high-speed CMOS static RAM with 12 ns access time, 5 V supply, TTL-compatible I/O, and automatic CE power-down. It operates in commercial temperature range (0°C to +70°C) and is packaged in a 32-pin 300-mil SOJ. Used in embedded controllers, industrial PLCs, and legacy communication interface buffers requiring fast, reliable non-volatile data retention during low-power states.

For engineers reviewing the CY7C1009B-12VC datasheet, CY7C1009B-12VC pinout, CY7C1009B-12VC application, or CY7C1009B-12VC equivalent, key selection criteria include tAA = 12 ns read timing, ISB1 ≤ 45 mA standby current under TTL input conditions, dual chip enable (CE1 active LOW / CE2 active HIGH), and 300-mil SOJ footprint compatibility with space-constrained PCB layouts.

Technical Context

This SRAM implements full asynchronous operation with independent address decoding, tri-state I/O drivers, and dual CE architecture enabling seamless memory expansion without external logic. Its CE1/CE2 gating allows hierarchical memory mapping-CE1 selects the device while CE2 enables write/read control paths, supporting banked memory systems.

The device uses standard CMOS process technology with TTL-compatible voltage thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and supports three distinct operational modes: active read (CE1=L, CE2=H, OE=L, WE=H), active write (CE1=L, CE2=H, WE=L), and automatic power-down (CE1=H or CE2=L). Data retention at 2.0 V is guaranteed only in L-version variants; this part is non-L and does not specify data retention below 5 V.

Key Specifications

Pinout & Package

Package: 32-pin 300-mil molded SOJ (package diagram 51-85041), body width 7.62 mm, lead pitch 1.27 mm, JEDEC MS-013 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with IS61LV1024-12T and CY7C109B-12VC, the CY7C1009B-12VC uniquely satisfies legacy 5 V TTL bus systems with minimal layout change-its 300-mil SOJ fits tighter pitch constraints while maintaining identical functional timing and CE/OE control semantics.

Availability

CY7C1009B-12VC is available at Aetrix Electronics and suitable for industrial PLCs, legacy communication adapters, embedded controller boot memory, and test equipment pattern generators requiring stable component supply with long-term lifecycle support.

Supply support for CY7C1009B-12VC 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 memory, PSoC, USB, and timing solutions for industrial and automotive markets.

The CY7C1009B belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin-compatible replacement of aging 28-pin and 32-pin HM628128/6116 families in cost-sensitive, high-reliability industrial control systems.

FAQ

Is CY7C1009B-12VC compatible with 3.3 V systems?

No. The device requires 5 V ±10% (4.5–5.5 V) supply and features TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). Operating below 4.5 V violates absolute maximum ratings and causes undefined behavior, including data corruption and increased standby current. For 3.3 V designs, consider IS61LV1024-12T with appropriate level-shifting.

What is the function of NC pin (Pin 15) in the 300-mil SOJ package?

Pin 15 is a no-connect terminal-internally unconnected to the die. Per Cypress design guidelines, it must remain electrically floating or be tied to GND for mechanical stability and EMI reduction. It must never be connected to VCC or driven by external logic, as this risks latch-up or parametric failure.

How does automatic power-down behave when CE1 and CE2 are simultaneously asserted?

Power-down activates only when CE1 is HIGH *or* CE2 is LOW. If CE1 = LOW and CE2 = HIGH, the device remains fully active. Simultaneous assertion (e.g., CE1 = LOW and CE2 = LOW) forces high-impedance I/O but does not guarantee reduced ICC-only the ISB1/ISB2 standby current specs apply under defined CE input voltage conditions per datasheet Table "Electrical Characteristics".

Can CY7C1009B-12VC replace HM628128 in existing designs?

Yes, with verification of pin mapping and timing margins. Both are 128K × 8 SRAMs in 32-pin SOJ, but HM628128 uses single CE (active LOW) and lacks CE2. CY7C1009B-12VC requires CE2 tied HIGH permanently and OE/WE timing validated against its 12 ns tAA and tDOE = 6 ns specs-critical for legacy 8086/80C188 bus interfaces.