Infineon Technologies CY7C1009D-10VXI

Overview

CY7C1009D-10VXI from Cypress Semiconductor is a 1-Mbit (128 K × 8) high-speed CMOS static RAM with 10 ns access time, TTL-compatible I/O, and automatic CE power-down. It operates at 5 V ±0.5 V over –40 °C to +85 °C, draws 80 mA active current and 3 mA CMOS standby current, and supports data retention down to 2.0 V - used in industrial microcontroller memory buffers and legacy embedded systems requiring pin-compatible SRAM replacement.

For engineers reviewing the CY7C1009D-10VXI datasheet, CY7C1009D-10VXI pinout, CY7C1009D-10VXI application, or CY7C1009D-10VXI equivalent, key selection criteria include its 32-pin 300-mil SOJ package, dual chip enable (CE1/CE2) for hierarchical memory expansion, tri-state outputs with 5 ns OE-to-data timing, and compatibility with 5 V TTL bus interfaces without level-shifting.

Technical Context

This SRAM implements a synchronous, non-volatile-retentive memory array organized as 131,072 × 8 bits, with independent address decoding (A0–A16), eight bidirectional I/O lines (I/O0–I/O7), and three control inputs (WE, OE, CE1, CE2) enabling flexible read/write gating. Its logic-level thresholds (VIH = 2.2 V min, VIL = 0.8 V max) are strictly TTL-aligned, not CMOS-compatible.

Power management relies on automatic CE-driven power-down: ISB2 = 3 mA occurs when CE1 > VCC – 0.3 V or CE2 < 0.3 V under CMOS input conditions, while ISB1 = 10 mA applies under TTL input assumptions. Data retention at 2.0 V requires full deselection (CE1 HIGH or CE2 LOW) and stable VCC ramp-up >50 µs before operation resumes.

Key Specifications

Pinout & Package

Package: 32-pin 300-mil wide molded SOJ (Small Outline J-Lead), Pb-free, JEDEC standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV102416-10TQLI and CY7C1009DV33-10ZXC, CY7C1009D-10VXI uniquely preserves 5 V TTL signaling, 32-pin SOJ footprint, and industrial temperature support - making it the sole viable option for sustaining legacy 5 V embedded systems without hardware modification.

Availability

CY7C1009D-10VXI is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy microcontroller code/data RAM, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for CY7C1009D-10VXI 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-reliability memory and programmable solutions for industrial, automotive, and communications infrastructure markets.

CY7C1009D belongs to Cypress's legacy parallel SRAM product line, engineered specifically for pin- and function-compatible replacement of aging 5 V TTL memory in long-lifecycle embedded systems.

FAQ

Is CY7C1009D-10VXI compatible with 3.3 V systems?

No. CY7C1009D-10VXI requires a 5 V ±0.5 V supply and is specified only for TTL-level inputs (VIH ≥ 2.2 V, VIL ≤ 0.8 V). Its 5 V VCC and input thresholds make it incompatible with 3.3 V logic families without level-shifting circuitry, and it lacks 3.3 V operational ratings in its datasheet.

What is the function of the NC pin (Pin 18)?

Pin 18 is a no-connect terminal - physically unconnected to the silicon die. Per Cypress design, it must remain electrically floating or be tied to ground per PCB layout best practices; driving or biasing it may cause undefined behavior or increased leakage.

Can CY7C1009D-10VXI interface directly with modern microcontrollers like ARM Cortex-M series?

Not without level translation. Cortex-M MCUs typically use 3.3 V LVCMOS I/O with VIH ≥ 2.0 V, but CY7C1009D-10VXI's 5 V VCC and TTL output drive (VOH ≥ 2.4 V @ –4 mA) risk overvoltage damage to 3.3 V inputs. A dedicated level shifter or buffer IC is mandatory for safe interfacing.

Does CY7C1009D-10VXI support battery backup operation?

Yes - it supports data retention at 2.0 V VCC when fully deselected (CE1 HIGH or CE2 LOW). However, no internal battery switch or backup controller is integrated; external circuitry (e.g., diode-OR + coin cell) must manage VCC switchover and maintain 2.0–5.5 V compliance during transition.