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Infineon Technologies CY7C1021B-15ZXC
- Part No.:
- CY7C1021B-15ZXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 44-TSOP (0.400", 10.16mm Width)
- Datasheet:
-
CY7C1021B-15ZXC.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 44TSOP II
- Quantity:
- Payment:
- Shipping:
Inventory:1,133
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Product details
Overview
CY7C1021B-15ZXC from Cypress Semiconductor is a 1-Mbit (64K × 16) high-speed CMOS static RAM with 15 ns maximum access time, 5 V ±10% supply, industrial temperature range (–40°C to +85°C), and Pb-free 44-pin TSOP II packaging. It supports independent byte write control via BHE/BLE inputs and automatic CE-controlled power-down for low standby current (10 mA max).
For engineers reviewing the CY7C1021B-15ZXC datasheet, CY7C1021B-15ZXC pinout, CY7C1021B-15ZXC application, or CY7C1021B-15ZXC equivalent, key selection criteria include tAA = 15 ns read timing, ISB2 = 10 mA CMOS standby current, dual-byte enable architecture, and compatibility with legacy 5 V parallel bus systems in industrial control and instrumentation.
Technical Context
The CY7C1021B-15ZXC implements a full 64K × 16 asynchronous SRAM array with separate address decoding paths for row and column selection, supporting concurrent access to upper and lower bytes via dedicated BHE and BLE controls. Its TTL/CMOS-compatible input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) ensure interoperability with legacy microcontrollers and FPGAs.
Timing behavior is defined by overlapping active-Low control signals: CE initiates chip selection, OE enables output drivers, and WE gates write operations - with byte-level granularity determined by BHE/BLE states. Power management relies on automatic CE-driven transition into ISB2 standby mode (10 mA) when CE is deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16 bits = 1 Mbit; supports 16-bit parallel data bus without external multiplexing. |
| Access Time (tAA) | 15 ns max at VCC = 5 V, TA = –40°C to +85°C; ensures compatibility with 66 MHz bus timing budgets. |
| Supply Voltage | 5 V ±10% (4.5 V to 5.5 V); matches standard TTL/CMOS logic rails and eliminates need for level shifters. |
| Standby Current (ISB2) | 10 mA max (CMOS inputs); enables low-power hold mode during processor idle cycles in embedded controllers. |
| Operating Temperature | –40°C to +85°C industrial grade; qualified for use in motor drives, PLCs, and factory automation hardware. |
| Package | 44-pin TSOP Type II, 400-mil width, Pb-free; surface-mount compatible with standard reflow profiles and IPC-7351B footprints. |
| I/O Drive Strength | VOL = 0.4 V at IOL = 8 mA; sufficient to drive 10 TTL loads or 30 pF capacitive bus loads per I/O line. |
Pinout & Package
44-pin TSOP Type II (JEDEC MO-143AC), 400-mil body width, Pb-free lead finish, 0.8 mm pitch. Pin 1 index marked by notch or dot; pins arranged in two 22-pin rows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; selects one of 65,536 memory locations; TTL/CMOS compatible thresholds. |
| I/O1–I/O8 | Data I/O (Lower Byte) | Bidirectional 8-bit data path controlled by BLE; tri-stated when BLE or CE is HIGH. |
| I/O9–I/O16 | Data I/O (Upper Byte) | Bidirectional 8-bit data path controlled by BHE; independent of lower byte for partial writes. |
| CE | Chip Enable | Active-Low global select; forces device into ISB2 standby (10 mA) when HIGH; enables fast power gating. |
| WE | Write Enable | Active-Low write strobe; combined with CE and BHE/BLE to define write cycle boundaries per JEDEC timing. |
| OE | Output Enable | Active-Low output driver control; disables outputs (high-Z) when HIGH; decouples read timing from CE. |
| BHE, BLE | Byte Write Enables | Active-Low controls for upper/lower byte; enables 8-bit partial writes without disturbing adjacent byte. |
| VCC (Pins 11, 33) | Power Supply | Primary 5 V supply; dual pins reduce IR drop and improve noise immunity on dense PCBs. |
| VSS (Pins 12, 34) | Ground | Dual ground connections minimize ground bounce and support stable read/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| Independent Byte Write Control | Separate BHE and BLE inputs allow atomic 8-bit writes to upper or lower byte without read-modify-write overhead. |
| Automatic CE Power-Down | Reduces ICC to 10 mA (ISB2) when CE is HIGH; eliminates need for external power management logic. |
| High-Speed 15 ns Access | tAA = 15 ns guarantees deterministic read latency for real-time firmware executing from SRAM. |
| Pb-Free TSOP II Packaging | RoHS-compliant 44-pin TSOP II footprint enables drop-in replacement in existing industrial PCB layouts. |
| TTL/CMOS Input Compatibility | VIH ≥ 2.2 V and VIL ≤ 0.8 V ensure reliable interfacing with both 5 V microcontrollers and FPGA I/O banks. |
Applications
| Industrial PLC Data Buffer | Automotive Engine Control Unit (ECU) Scratchpad |
|---|---|
|
Use Scenario: Storing transient sensor fusion results and I/O state snapshots in programmable logic controllers during cyclic scan execution. IC Role / Device Role / Timing Role: Asynchronous 16-bit data buffer with byte-selectable writes, synchronized to 10–20 ms scan cycles using CE-gated power-down between scans. Use Value: 15 ns tAA enables full 64K word access within single CPU instruction cycle; ISB2 = 10 mA minimizes thermal load during 95% idle duty cycle. |
Use Scenario: Holding runtime-calibrated lookup tables and real-time PID coefficients in engine control modules operating under under-hood thermal stress. IC Role / Device Role / Timing Role: Non-volatile scratchpad memory accessed directly by MCU's external bus interface during closed-loop combustion control loops. Use Value: –40°C to +85°C rating ensures timing compliance across ambient extremes; dual VCC/VSS pins suppress supply noise induced by injector switching transients. |
| Medical Imaging Frame Buffer | Test & Measurement Equipment FIFO |
|
Use Scenario: Capturing raw pixel streams from analog-to-digital converters in portable ultrasound devices prior to DSP processing. IC Role / Device Role / Timing Role: High-bandwidth parallel write buffer accepting 16-bit pixel data at up to 66 MHz effective rate using interleaved BHE/BLE writes. Use Value: Independent byte enables simultaneous capture of even/odd pixel pairs; tHZOE = 7 ns ensures clean bus release before next sample clock edge. |
Use Scenario: Implementing deep acquisition buffers in digital oscilloscopes and logic analyzers where deterministic read latency is critical for trigger accuracy. IC Role / Device Role / Timing Role: Asynchronous FIFO core with CE-controlled power gating between acquisition bursts to extend battery life. Use Value: 15 ns tAA and tACE guarantee sub-20 ns response to trigger events; 30 pF AC load spec validates signal integrity on 50 Ω probe interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1-Mbit parallel SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C1008-15ZIN | Same 64K × 16 organization, 15 ns access, but uses 32-pin SOJ; no BHE/BLE - single 16-bit write only. | Lacks byte-write capability; requires external logic for partial writes; lower pin count reduces PCB area. | Select when system design does not require byte-level write granularity and board space is constrained. |
| IS61LV1024-15K | 64K × 16, 15 ns, 3.3 V core (with 5 V tolerant I/O); 44-pin TSOP II; ISB = 25 µA typical (vs. 10 mA). | Requires level translation for pure 5 V systems; ultra-low standby suits battery-backed applications. | Select when migrating to 3.3 V domains or requiring <100 µA standby; avoid in legacy 5 V-only designs. |
Compared with AS6C1008-15ZIN and IS61LV1024-15K, the CY7C1021B-15ZXC uniquely delivers 5 V-native operation with true dual-byte write control in a drop-in TSOP II package - essential for maintaining timing integrity and minimizing gate count in industrial bus-based systems.
Availability
CY7C1021B-15ZXC is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical imaging subsystems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY7C1021B-15ZXC 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.
The CY7C1021B series targets legacy 5 V parallel bus systems requiring deterministic timing, robust ESD tolerance (>2001 V), and industrial-grade thermal performance without voltage translation.
FAQ
Is CY7C1021B-15ZXC compatible with 3.3 V I/O systems?
No. The CY7C1021B-15ZXC is a 5 V-only device with VIH minimum of 2.2 V and VIL maximum of 0.8 V - it lacks 3.3 V tolerant inputs. Interfacing with 3.3 V controllers requires level-shifting circuitry or selection of a 3.3 V SRAM like IS61LV1024-15K.
What is the difference between ISB1 and ISB2 standby current specifications?
ISB1 (40 mA max) applies when CE is HIGH and inputs are TTL-level driven; ISB2 (10 mA max) applies when CE is HIGH and all inputs are held at CMOS levels (VCC – 0.3 V or 0.3 V). ISB2 reflects true low-power mode achievable with proper input biasing in modern designs.
Can CY7C1021B-15ZXC perform simultaneous read and write operations?
No. It is an asynchronous SRAM with single-port architecture: the same address/data bus is used for both read and write. True simultaneous R/W requires dual-port or QDR SRAM. This device supports only sequential or interleaved access via CE/OE/WE timing control.
Does the CY7C1021B-15ZXC require external pull-up resistors on BHE/BLE pins?
No. BHE and BLE are active-Low inputs with standard TTL/CMOS thresholds; they must be driven actively LOW for byte write enable or HIGH (via controller GPIO or bus line) for disable. Floating these pins is undefined and may cause partial writes or bus contention.
CY7C1021B-15ZXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 44-TSOP (0.400", 10.16mm Width)
- Packaging:
- Bag
- 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:
- 15ns
- Access Time:
- 15 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-15ZXC FAQ
1.How can I place an order for CY7C1021B-15ZXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1021B-15ZXC 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-15ZXC reliable?
The price and inventory of CY7C1021B-15ZXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1021B-15ZXC is usually 5 days.
3.What payment methods are accepted for CY7C1021B-15ZXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1021B-15ZXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1021B-15ZXC?
CY7C1021B-15ZXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1021B-15ZXC 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-15ZXC?
For technical support, including CY7C1021B-15ZXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1021B-15ZXC requirements.
6.How does Aetrix verify that CY7C1021B-15ZXC is sourced from the original manufacturer or authorized distributors?
All CY7C1021B-15ZXC 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-15ZXC meets industry standards.
7.What is the process for return or replacement of CY7C1021B-15ZXC?
All CY7C1021B-15ZXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1021B-15ZXC, 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-15ZXC part is unused and in its original packaging.
Return procedure for CY7C1021B-15ZXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C1021B-15ZXC Tags
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