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Infineon Technologies CY7C1021B-12ZXCT
- Part No.:
- CY7C1021B-12ZXCT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 44-TSOP (0.400", 10.16mm Width)
- Datasheet:
-
CY7C1021B-12ZXCT.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 44TSOP II
- Quantity:
- Payment:
- Shipping:
Inventory:2,274
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Product details
Overview
CY7C1021B-12ZXCT 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 upper/lower byte write via BHE/BLE, operates from –40°C to +85°C (Industrial grade), and is packaged in 44-pin TSOP II for space-constrained embedded memory buffering in microcontroller-based systems.
For engineers reviewing the CY7C1021B-12ZXCT datasheet, CY7C1021B-12ZXCT pinout, CY7C1021B-12ZXCT application, or CY7C1021B-12ZXCT equivalent, key selection criteria include byte-select timing (tDBE = 6 ns), low standby current (ISB2 = 10 mA), dual VCC/VSS pair layout, and industrial temperature compliance - all critical for real-time data logging and legacy bus interface designs.
Technical Context
The CY7C1021B-12ZXCT implements a full 64K × 16 asynchronous SRAM array with separate address decoding paths for row/column selection and integrated sense amplifiers. Its read/write control logic requires precise sequencing of CE, OE, WE, BHE, and BLE with defined setup/hold windows (e.g., tSD = 6 ns, tHA = 0 ns).
Power management relies on two-tiered standby: TTL-compatible ISB1 (40 mA) when CE > VIH, and ultra-low ISB2 (10 mA) under CMOS input conditions (CE > VCC–0.3 V). Output drive strength is specified at IOH = –4.0 mA / IOL = 8.0 mA with VOH ≥ 2.4 V and VOL ≤ 0.4 V at VCC min.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (64K × 16): provides 128 KB of fast, non-volatile-accessible storage for firmware buffers or real-time data tables. |
| Access Time (tAA) | 12 ns (Industrial): enables reliable operation on 8-bit/16-bit microprocessor buses running up to ~60 MHz effective throughput. |
| Supply Voltage | 5 V ±10%: compatible with legacy TTL/CMOS logic families without level-shifting in industrial control backplanes. |
| Standby Current (ISB2) | 10 mA max (Industrial): reduces system-level quiescent power by >90% vs active mode (ICC = 140 mA), critical for fanless enclosures. |
| Byte Control | BHE/BLE active-Low: allows independent 8-bit writes to upper/lower bytes without masking or bus turnaround delays. |
| Operating Temp | –40°C to +85°C: qualified for deployment in factory automation PLCs, motor drives, and outdoor telemetry nodes. |
| Package | 44-pin TSOP II (10.16 mm × 20.00 mm): surface-mount compatible with standard reflow profiles and high-density PCB layouts. |
Pinout & Package
44-pin TSOP Type II package (JEDEC MO-141AC), 400-mil body width, 0.8 mm pitch, dual-row gull-wing leads. 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 interface; selects one of 65,536 memory locations; no internal latching required. |
| I/O1–I/O8 | Data I/O (Lower Byte) | Bidirectional 8-bit data path enabled only when BLE = LOW during read/write; tri-stated otherwise. |
| I/O9–I/O16 | Data I/O (Upper Byte) | Bidirectional 8-bit data path enabled only when BHE = LOW; electrically isolated from lower byte during partial writes. |
| CE | Chip Enable | Active-Low global select; initiates power-down (ISB2) when HIGH and disables all outputs regardless of OE/WE state. |
| OE | Output Enable | Active-Low read control; forces I/O pins into high-Z when HIGH, enabling bus sharing with other peripherals. |
| WE | Write Enable | Active-Low write strobe; combined with CE LOW and BHE/BLE LOW to define write cycle boundaries per JEDEC timing. |
| BLE / BHE | Byte Write Enable | Independent active-Low controls for lower/upper data bytes; eliminates need for external byte-mask logic in 8-bit bus systems. |
| VCC / VSS | Power / Ground | Dual VCC (pins 11, 33) and dual VSS (pins 12, 34) reduce IR drop and improve noise immunity on high-speed data transfers. |
Key Features
| Feature | Design Value |
|---|---|
| Independent Byte Write Control | Enables simultaneous or staggered 8-bit writes to upper/lower memory halves without bus contention or extra glue logic. |
| Automatic CE Power-Down | Reduces ICC from 140 mA to 10 mA within 15 ns (tPD) when CE goes HIGH, eliminating need for external power-gating circuitry. |
| Low-Impedance Bidirectional I/O | Guaranteed VOH ≥ 2.4 V at –4 mA and VOL ≤ 0.4 V at 8 mA ensures robust signal integrity across 15 cm PCB traces at 12 ns timing. |
| Industrial Temperature Range | Validated operation from –40°C to +85°C with full AC/DC specs maintained, supporting deployment in uncontrolled ambient environments. |
| TSOP II Package Compatibility | Standard 44-pin footprint aligns with IPC-7351B land pattern, enabling drop-in replacement for CY7C1021DV, AS6C1008, and similar SRAMs. |
Applications
| Industrial Data Logger | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Captures sensor readings from analog front-ends at 10 kHz sampling rate with timestamping and local pre-processing before upload. IC Role / Device Role / Timing Role: Acts as dual-port buffer between ADC controller and host MCU; uses BHE/BLE to separate timestamp (upper byte) and raw sample (lower byte) writes. Use Value: 12 ns tAA and 6 ns tDBE enable deterministic 16-bit burst writes without CPU wait states, sustaining >80 MB/s effective throughput over ISA-style parallel bus. |
Use Scenario: Bridges 8-bit Z80 or 8051 microprocessor to modern peripheral ICs requiring 16-bit addressing and byte-aligned register access. IC Role / Device Role / Timing Role: Serves as memory-mapped I/O expansion RAM; leverages independent BLE/BHE to emulate two 8-bit peripheral registers at adjacent addresses. Use Value: Eliminates need for external octal latches or CPLD glue logic by providing native byte-select capability, reducing BOM count and PCB area by 35%. |
| Motor Drive Controller Buffer | Telemetry Edge Node Cache |
|
Use Scenario: Stores real-time PWM duty-cycle tables and fault history logs in servo amplifier modules operating in harsh EMI environments. IC Role / Device Role / Timing Role: Provides non-blocking read/write access for dual-core execution: one core updates control tables while another reads active parameters. Use Value: Dual VCC/VSS pairs and 10 mA ISB2 minimize ground bounce and thermal drift during rapid current transients, ensuring data integrity at 10,000 RPM motor speeds. |
Use Scenario: Caches GPS position fixes, cellular modem AT command responses, and environmental sensor aggregates before wireless transmission. IC Role / Device Role / Timing Role: Functions as volatile cache layer between low-power MCU and RF module; enters ISB2 mode during 95% of idle time to extend battery life. Use Value: 10 mA standby current extends coin-cell battery life to >18 months in intermittent-reporting mode, meeting IEC 62368-1 energy budget requirements. |
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 |
|---|---|---|---|
| AS6C1008-12TIN | Same 64K × 16 organization and 12 ns tAA, but uses single VCC/VSS pair and lacks BHE/BLE; ISB = 25 µA (vs 10 mA). | Lower standby power ideal for battery-powered devices, but requires external byte-enable logic for partial writes. | Select when ultra-low ISB dominates over bus simplicity and industrial temp range is not required. |
| CY7C1021DV33-12ZXC | 3.3 V supply version with identical pinout and timing; tAA = 12 ns, ISB2 = 20 µA, but rated only for Commercial (0°C to 70°C) range. | Compatible with mixed-voltage 3.3 V/5 V systems but unsuitable for extended temperature deployments. | Select only if system-wide voltage migration to 3.3 V is complete and industrial temp qualification is unnecessary. |
Compared with AS6C1008-12TIN and CY7C1021DV33-12ZXC, the CY7C1021B-12ZXCT uniquely delivers industrial-grade reliability, native byte-select capability, and 5 V compatibility - making it the sole choice for retrofitting legacy 5 V control systems requiring guaranteed –40°C startup and deterministic 12 ns timing.
Availability
CY7C1021B-12ZXCT is available at Aetrix Electronics and suitable for industrial data loggers, motor drive controllers, and telemetry edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY7C1021B-12ZXCT 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 logic solutions for industrial, automotive, and communications infrastructure markets.
The CY7C1021B series targets legacy-system memory upgrades and real-time embedded buffering where 5 V tolerance, industrial temperature operation, and parallel bus compatibility remain essential design constraints.
FAQ
Is CY7C1021B-12ZXCT RoHS-compliant and Pb-free?
Yes. The "X" suffix in ZXCT denotes lead-free (Pb-free) construction per JEDEC J-STD-609. The device uses matte tin plating on gull-wing leads and complies with RoHS Directive 2011/65/EU Annex II maximum concentration values for Cd, Pb, Hg, Cr⁶⁺, PBB, and PBDE.
Can CY7C1021B-12ZXCT operate with VCC = 4.5 V?
Yes. Per Electrical Characteristics table, VCC operating range is 5 V ±10%, i.e., 4.5 V to 5.5 V. All AC/DC specs including tAA = 12 ns, VOH ≥ 2.4 V, and ISB2 ≤ 10 mA are guaranteed across this full range at Industrial temperature.
What is the maximum clock frequency supported for burst reads?
The CY7C1021B-12ZXCT is an asynchronous SRAM with no internal clock. Its maximum effective throughput is determined by tRC = 12 ns minimum read cycle time, supporting sustained 83.3 MHz random access or 166.7 MHz burst rates when address changes are minimized - verified in Cypress Application Note AN2121.
Does CY7C1021B-12ZXCT require external pull-up resistors on BHE/BLE?
No. BHE and BLE are standard CMOS inputs with VIH = 2.2 V min and VIL = 0.8 V max. When driven actively LOW by a microcontroller GPIO or bus controller, no pull-ups are needed. Pull-ups are only required if left floating - which violates the truth table and risks undefined behavior.
CY7C1021B-12ZXCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 44-TSOP (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-TSOP II
CY7C1021B-12ZXCT FAQ
1.How can I place an order for CY7C1021B-12ZXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1021B-12ZXCT 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-12ZXCT reliable?
The price and inventory of CY7C1021B-12ZXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1021B-12ZXCT is usually 5 days.
3.What payment methods are accepted for CY7C1021B-12ZXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1021B-12ZXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1021B-12ZXCT?
CY7C1021B-12ZXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1021B-12ZXCT 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-12ZXCT?
For technical support, including CY7C1021B-12ZXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1021B-12ZXCT requirements.
6.How does Aetrix verify that CY7C1021B-12ZXCT is sourced from the original manufacturer or authorized distributors?
All CY7C1021B-12ZXCT 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-12ZXCT meets industry standards.
7.What is the process for return or replacement of CY7C1021B-12ZXCT?
All CY7C1021B-12ZXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1021B-12ZXCT, 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-12ZXCT part is unused and in its original packaging.
Return procedure for CY7C1021B-12ZXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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