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Infineon Technologies CY7C1021B-12VXCT
- Part No.:
- CY7C1021B-12VXCT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 44-BSOJ (0.400", 10.16mm Width)
- Datasheet:
-
CY7C1021B-12VXCT.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 44SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
CY7C1021B-12VXCT from Cypress Semiconductor is a 1-Mbit (64K × 16) high-speed CMOS static RAM with 12 ns access time, 5 V supply, and automatic CE-controlled power-down. It supports independent byte write via BHE/ BLE control, operates from –40°C to +85°C (industrial grade), and is packaged in Pb-free 44-pin TSOP II for space-constrained embedded memory buffering.
For engineers reviewing the CY7C1021B-12VXCT datasheet, CY7C1021B-12VXCT pinout, CY7C1021B-12VXCT application, or CY7C1021B-12VXCT equivalent, key selection criteria include tAA ≤ 12 ns read timing, dual-byte enable architecture, ISB2 standby current ≤ 10 mA, and industrial temperature compliance - critical for real-time data logging and legacy bus interface designs.
Technical Context
The CY7C1021B-12VXCT implements a fully static 64K × 16 RAM array with separate byte-level write control (BHE/BLE), enabling partial-word updates without read-modify-write cycles. Its TTL-compatible inputs and CMOS core deliver low active power (770 mW max) while maintaining 12 ns address-to-data validity under industrial conditions.
Power management relies on CE-driven automatic power-down: when CE is HIGH, ICC drops to ≤10 mA (ISB2), and I/O pins enter high-impedance state regardless of OE, WE, or byte-enable states. The device requires no clocks or refresh, supporting asynchronous parallel bus interfacing with microcontrollers and FPGAs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16 (1 Mbit); enables 16-bit wide data transfers without external multiplexing |
| Access Time (tAA) | 12 ns max at 5 V, –40°C to +85°C; meets tight timing budgets in 25 MHz bus systems |
| Supply Voltage | 5 V ±10%; compatible with legacy 5 V logic families and mixed-voltage board designs |
| Standby Current (ISB2) | 10 mA max (CMOS input mode); ensures low quiescent power during idle bus cycles |
| Byte Write Control | BHE and BLE inputs enable independent upper/lower byte writes; eliminates full-word overwrites |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, motor control, and telecom line cards |
| Package | 44-pin TSOP II (10.16 mm × 18.42 mm); surface-mount compatible with standard reflow profiles |
Pinout & Package
44-pin TSOP Type II (JEDEC MO-141AC), Pb-free, 0.8 mm pitch, 10.16 mm × 18.42 mm body size, 1.2 mm max height. Pin 1 marked by notch or dot; pin 11 and 33 are VCC; pins 12 and 34 are VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Input | 16-bit address bus; selects one of 65,536 memory locations; no internal latching |
| I/O1–I/O8 | Bi-directional Data (Lower Byte) | Driven by BLE; used for read/write of D0–D7; tri-stated when BLE or CE HIGH |
| I/O9–I/O16 | Bi-directional Data (Upper Byte) | Driven by BHE; used for read/write of D8–D15; tri-stated when BHE or CE HIGH |
| CE | Chip Enable (Active LOW) | Primary chip select; enables memory access and triggers automatic power-down when HIGH |
| WE | Write Enable (Active LOW) | Controls write cycle initiation; must be LOW with CE LOW and BHE/BLE LOW to store data |
| OE | Output Enable (Active LOW) | Enables output drivers; HIGH forces I/O pins into high-Z regardless of CE or byte enables |
| BLE / BHE | Byte Low/High Enable (Active LOW) | Independent control of lower/upper byte paths; allows 8-bit sub-word writes in 16-bit systems |
| VCC / VSS | Power / Ground | Dual VCC (pins 11, 33) and dual VSS (pins 12, 34) reduce IR drop and improve noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC to ≤10 mA (ISB2) when CE is deasserted, eliminating need for external power gating |
| Dual-Byte Write Architecture | Separate BHE/BLE control enables true 8-bit writes without disturbing adjacent byte in 16-bit word |
| 12 ns Read Timing (tAA) | Guaranteed at industrial temperature range; supports 25 MHz synchronous bus handshaking |
| Pb-Free TSOP II Packaging | RoHS-compliant 44-pin TSOP II footprint; drop-in replacement for legacy SOJ-based designs |
| No Clock or Refresh Required | Fully static operation simplifies FPGA/microcontroller interface design and reduces system-level timing overhead |
Applications
| Industrial Data Logger | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Buffering sensor data streams from multiple analog channels before batch transmission over RS-485. IC Role / Device Role / Timing Role: Asynchronous 16-bit parallel memory buffer interfaced to an 8051 derivative MCU via ISA-like address/data bus. Use Value: 12 ns tAA ensures zero-wait-state operation at 25 MHz bus clock; dual-byte writes allow efficient packing of 12-bit ADC samples into aligned words. |
Use Scenario: Bridging a 16-bit microprocessor bus to a modern FPGA-based peripheral controller using discrete glue logic. IC Role / Device Role / Timing Role: Static RAM acting as shared memory window between host CPU and FPGA co-processor for command/status exchange. Use Value: Independent BHE/BLE enables FPGA to update status flags (upper byte) while CPU reads sensor values (lower byte) concurrently - no arbitration required. |
| Motor Drive Controller | Telecom Line Card Buffer |
|
Use Scenario: Storing real-time PWM duty-cycle tables and fault history logs in a servo drive with limited PCB area. IC Role / Device Role / Timing Role: Non-volatile shadow RAM holding configuration parameters; accessed only during initialization or fault recovery. Use Value: ISB2 ≤10 mA minimizes standby power draw during motor idle periods; TSOP II package fits dense gate-driver layout. |
Use Scenario: Holding packet header metadata and channel assignment tables in a T1/E1 framer card with strict thermal limits. IC Role / Device Role / Timing Role: High-reliability scratchpad memory for protocol engine state tracking across multiple DS0 channels. Use Value: Industrial temperature rating (–40°C to +85°C) ensures stable operation in unventilated chassis; 12 ns tAA supports 125 Mbps framing logic timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed parallel SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C1008-12IN | 1-Mbit (128K × 8), 12 ns, single-byte interface, 3.3 V only | Requires external byte-width adaptation for 16-bit buses; incompatible with 5 V systems | Select only if migrating to 3.3 V architecture and redesigning bus interface logic |
| IS61LV1024-12ML | 1-Mbit (64K × 16), 12 ns, 3.3 V supply, LVTTL-compatible | Lower VCC invalidates direct replacement in 5 V systems; higher tHZOE (8 ns vs. 6 ns) | Use when upgrading to 3.3 V and requiring extended temperature support up to +105°C |
Compared with AS6C1008-12IN and IS61LV1024-12ML, the CY7C1021B-12VXCT uniquely supports 5 V operation, dual-byte writes, and industrial-grade reliability in a drop-in TSOP II footprint - making it the sole viable option for maintaining legacy 5 V embedded systems without bus redesign.
Availability
CY7C1021B-12VXCT is available at Aetrix Electronics and suitable for industrial data loggers, motor drive controllers, and telecom line cards requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for CY7C1021B-12VXCT 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, microcontrollers, and programmable logic solutions for industrial and automotive markets.
The CY7C1021B belongs to Cypress's legacy parallel SRAM product line, designed specifically for 5 V embedded systems requiring high-speed, low-power, and industrial-temperature nonvolatile buffer memory without refresh overhead.
FAQ
Is CY7C1021B-12VXCT pin-compatible with CY7C1021B-12VC?
Yes - both share identical 44-pin TSOP II pinout and electrical behavior. The "X" in -12VXCT denotes Pb-free construction, while -12VC uses leaded solder. Mechanical dimensions, thermal resistance (ΘJA = 76.89°C/W), and all timing parameters remain unchanged.
Can CY7C1021B-12VXCT operate at 3.3 V?
No - the device is specified only for 5 V ±10% (4.5 V to 5.5 V). Attempting 3.3 V operation violates VCC min specification and results in undefined timing, increased tAA, and potential data corruption due to insufficient noise margin on TTL-compatible inputs.
What happens to I/O pins when CE is HIGH and OE is LOW?
I/O pins go to high-impedance state regardless of OE level when CE is HIGH. This is explicitly defined in the truth table and functional description: CE HIGH forces automatic power-down and disables all outputs, overriding OE and byte-enable controls.
Does CY7C1021B-12VXCT require external pull-up resistors on BHE/BLE?
No - BHE and BLE are CMOS inputs with VIH ≥ 2.2 V and VIL ≤ 0.8 V at 5 V. When driven directly by microcontroller GPIOs or FPGA I/O banks configured for 5 V-tolerant mode, no pull-ups are needed; floating inputs must be avoided per datasheet guidance.
CY7C1021B-12VXCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 44-BSOJ (0.400", 10.16mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 1Mbit
- Memory Organization:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-SOJ
CY7C1021B-12VXCT FAQ
1.How can I place an order for CY7C1021B-12VXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1021B-12VXCT 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 CY7C1021B-12VXCT reliable?
The price and inventory of CY7C1021B-12VXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1021B-12VXCT is usually 5 days.
3.What payment methods are accepted for CY7C1021B-12VXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1021B-12VXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1021B-12VXCT?
CY7C1021B-12VXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1021B-12VXCT 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 CY7C1021B-12VXCT?
For technical support, including CY7C1021B-12VXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1021B-12VXCT requirements.
6.How does Aetrix verify that CY7C1021B-12VXCT is sourced from the original manufacturer or authorized distributors?
All CY7C1021B-12VXCT 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 CY7C1021B-12VXCT meets industry standards.
7.What is the process for return or replacement of CY7C1021B-12VXCT?
All CY7C1021B-12VXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1021B-12VXCT, 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 CY7C1021B-12VXCT part is unused and in its original packaging.
Return procedure for CY7C1021B-12VXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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