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Infineon Technologies CY7C1049B-20VC
- Part No.:
- CY7C1049B-20VC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 36-BSOJ (0.400", 10.16mm Width)
- Datasheet:
-
CY7C1049B-20VC.pdf
- Description:
- IC SRAM 4MBIT PARALLEL 36SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,412
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Product details
Overview
CY7C1049B-20VC from Cypress Semiconductor is a 512K × 8 (4-Mbit) high-speed CMOS static RAM with 20 ns maximum access time, TTL-compatible I/O, automatic CE-controlled power-down, and 2.0V data retention capability. It operates at 4.5–5.5V over 0°C to +70°C and is used in legacy industrial controllers, telecom line cards, and embedded systems requiring nonvolatile SRAM backup during brownout.
For engineers reviewing the CY7C1049B-20VC datasheet, CY7C1049B-20VC pinout, CY7C1049B-20VC application, or CY7C1049B-20VC equivalent, key selection criteria include tAA = 20 ns read timing, ISB2 ≤ 8 mA CMOS standby current (Commercial), VDR = 2.0V retention voltage, and SOJ-36 package compatibility with legacy PCB layouts.
Technical Context
The CY7C1049B-20VC implements a full asynchronous SRAM architecture with independent address decoding, three-state bidirectional I/O drivers, and dual-enable control (CE/OE/WE). Its internal power-down logic activates automatically when CE is HIGH, reducing ICC to ≤8 mA without external sequencing.
It supports three standard read/write cycles: CE-controlled, OE-controlled, and WE-controlled (with OE LOW), each with defined setup/hold and transition timing (e.g., tSD = 9 ns, tHZOE = 8 ns). The device uses a center-power/center-ground SOJ-36 pinout to minimize noise coupling in dense memory arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 524,288 × 8 bits - delivers 4 Mbit capacity with byte-wide data bus alignment |
| Access Time (tAA) | 20 ns max - defines minimum clock-to-data latency for synchronous interface integration |
| VCC Operating Range | 4.5 V to 5.5 V - ensures compatibility with legacy 5V TTL and mixed-signal systems |
| Standby Current (ISB2) | 8 mA max (Commercial) - enables low-power sleep mode without external power gating |
| Data Retention Voltage | 2.0 V - allows battery-backed operation down to single-cell LiFePO₄ or coin-cell levels |
| I/O Capacitance | 8 pF - limits signal integrity degradation on long traces up to 10 cm at 25 MHz |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial control cabinets and office equipment |
Pinout & Package
The CY7C1049B-20VC is housed in a 36-pin SOJ (Small Outline J-Lead) package, 400-mil wide, with center power (VCC) and ground (GND) pins - a layout optimized for reduced supply noise and thermal symmetry in multi-SRAM banks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word decoding; no address multiplexing required |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/Os with 8 mA sink / 4 mA source drive; shared for read and write |
| CE | Chip Enable (active LOW) | Primary chip-select; enables automatic power-down and high-impedance I/O when HIGH |
| OE | Output Enable (active LOW) | Gates output drivers only; does not affect internal power state or write capability |
| WE | Write Enable (active LOW) | Controls write latching; must be LOW with CE LOW to initiate write cycle |
| VCC, GND | Power Supply Pins | Center-placed VCC (Pin 18) and GND (Pin 19) reduce IR drop and improve decoupling effectiveness |
Key Features
| Feature | Design Value |
|---|---|
| 20 ns access time with full 5V operation | Meets timing closure for 25 MHz bus interfaces without wait states in legacy microcontroller designs |
| Automatic CE power-down | Reduces active standby current to ≤8 mA without software intervention or external logic |
| 2.0V data retention | Enables seamless backup using 2.0–3.0V coin cells or supercapacitors during main power loss |
| TTL-compatible I/O thresholds | Interoperates directly with 74LS, 74HC, and early ARM/MIPS processors without level shifters |
| SOJ-36 center-power pinout | Improves signal integrity and thermal distribution in high-density memory modules and backplanes |
Applications
| Industrial PLC Memory Buffer | Telecom Line Card Data Cache |
|---|---|
Use Scenario: Stores real-time I/O mapping and configuration tables in programmable logic controllers during runtime and firmware updates. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state access for ladder logic execution engines. Use Value: 20 ns tAA ensures deterministic scan-cycle timing under 10 ms PLC cycle budgets; 2.0V retention preserves critical state during AC brownouts. | Use Scenario: Caches packet header metadata and channel status in T1/E1 framing IC interfaces on carrier-grade line cards. IC Role / Device Role / Timing Role: Nonvolatile shadow RAM holding configuration registers and alarm history across hot-swap events. Use Value: SOJ-36 footprint matches legacy board layouts; ISB2 ≤ 8 mA minimizes thermal load in convection-cooled chassis. |
| Legacy Medical Imaging Controller | Avionics Display System Frame Buffer |
Use Scenario: Buffers grayscale pixel data between FPGA-based image acquisition and analog video DACs in ultrasound front-ends. IC Role / Device Role / Timing Role: Byte-accessible frame buffer supporting burst reads aligned to 8-bit pixel depth. Use Value: TTL-compatible I/O eliminates level-shifting components; tOHA = 3 ns prevents address hold violations during rapid pointer updates. | Use Scenario: Holds display list instructions and glyph bitmaps in certified cockpit display units with dual-redundant power paths. IC Role / Device Role / Timing Role: Retentive SRAM maintaining display state during primary power interruption (≤100 ms). Use Value: 2.0V VDR enables direct connection to backup lithium thionyl chloride cells; CE-driven power-down meets DO-254 transient response requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-20PCN | 20 ns tAA, 5V-only, 4.5–5.5V VCC, ISB = 3 µA (lower), but no 2.0V retention | Lacks data retention below 3.0V; requires external backup circuitry for brownout protection | Select when ultra-low standby current is prioritized over battery-backed retention |
| IS61LV5128-20TI | 20 ns tAA, 3.3V core (3.0–3.6V), 5V-tolerant I/O, ISB = 1 µA, no 2.0V retention | Requires level translation for 5V buses; incompatible with direct 5V system integration | Choose only in new 3.3V designs with voltage translation; not drop-in for CY7C1049B-20VC |
Compared with AS6C4008-20PCN and IS61LV5128-20TI, the CY7C1049B-20VC uniquely supports 2.0V data retention without external circuitry while maintaining full 5V TTL compatibility - making it irreplaceable in legacy 5V systems requiring guaranteed state preservation during power interruption.
Availability
CY7C1049B-20VC is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, legacy medical imaging controllers, and avionics display systems requiring stable component supply and long-term obsolescence management.
Supply support for CY7C1049B-20VC 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, automotive, and communications markets.
The CY7C1049B belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin-compatible replacement of aging 5V NMOS and HMOS memories in mission-critical industrial and telecom infrastructure.
FAQ
What is the minimum VCC required for reliable data retention on CY7C1049B-20VC?
The CY7C1049B-20VC guarantees data retention down to exactly 2.0V (VDR = 2.0V), with ICCDR ≤ 200 µA at VCC = 3.0V and CE held HIGH. Below 2.0V, retention is not specified and data loss may occur within seconds. This threshold is verified per JEDEC JESD78 and applies across the full commercial temperature range (0°C to +70°C).
Does CY7C1049B-20VC support true 3.3V operation?
No. The CY7C1049B-20VC is a 5V-only device with absolute maximum VCC rating of 5.5V and minimum operating VCC of 4.5V. Its input thresholds (VIH = 2.2V min, VIL = 0.8V max) and output drive (VOH = 2.4V min at –4 mA) are TTL-compatible, not LVTTL or LVCMOS. Operation below 4.5V violates datasheet specifications and risks data corruption.
Can CY7C1049B-20VC be used in place of CY7C1049B-15VC without timing impact?
Yes, but with reduced performance margin. The -20VC variant has identical pinout, DC characteristics, and functional behavior as the -15VC, but its maximum tAA is relaxed from 15 ns to 20 ns. Systems designed for 15 ns timing will operate reliably at 20 ns, though bus clock rates may need reduction from 66.7 MHz to 50 MHz to maintain setup/hold margins.
Is the SOJ-36 package of CY7C1049B-20VC lead-free compliant?
No. The CY7C1049B-20VC (VC suffix) uses a tin-lead (SnPb) solder finish per original Cypress specification. RoHS-compliant versions were not released under this part number. For lead-free alternatives, consider Infineon's post-acquisition requalified equivalents (e.g., CY7C1049B-20VCT), which require validation of thermal profile and solder paste compatibility.
CY7C1049B-20VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 36-BSOJ (0.400", 10.16mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SOJ
CY7C1049B-20VC FAQ
1.How can I place an order for CY7C1049B-20VC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1049B-20VC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY7C1049B-20VC reliable?
The price and inventory of CY7C1049B-20VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1049B-20VC is usually 5 days.
3.What payment methods are accepted for CY7C1049B-20VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1049B-20VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1049B-20VC?
CY7C1049B-20VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1049B-20VC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY7C1049B-20VC?
For technical support, including CY7C1049B-20VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1049B-20VC requirements.
6.How does Aetrix verify that CY7C1049B-20VC is sourced from the original manufacturer or authorized distributors?
All CY7C1049B-20VC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY7C1049B-20VC meets industry standards.
7.What is the process for return or replacement of CY7C1049B-20VC?
All CY7C1049B-20VC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1049B-20VC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY7C1049B-20VC part is unused and in its original packaging.
Return procedure for CY7C1049B-20VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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