My Inquiry
My Account
Infineon Technologies CY7C028V-20AC
- Part No.:
- CY7C028V-20AC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
CY7C028V-20AC.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,081
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C028V-20AC from Cypress Semiconductor is a 64K × 16-bit true dual-port static RAM with independent left/right ports, 20 ns maximum access time, 3.3 V supply, and integrated arbitration logic for interprocessor communication. It supports simultaneous asynchronous read/write to the same memory location and is used in multiprocessor status buffering and video frame store applications.
For engineers reviewing the CY7C028V-20AC datasheet, CY7C028V-20AC pinout, CY7C028V-20AC application, or CY7C028V-20AC equivalent, key selection criteria include dual-port arbitration timing (tBLA = 20 ns), standby current (ISB3 = 10 µA), byte-select control (UBL/LBL), semaphore latch count (8), and TQFP-100 package compatibility.
Technical Context
The CY7C028V-20AC implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A15L/I/O0L–I/O15L/CE0L/R/WL/OEL on left; A0R–A15R/I/O0R–I/O15R/CE0R/R/WR/OER on right). On-chip arbitration resolves contention via BUSY flag assertion and SEM logic with eight shared latches.
It features master/slave configuration via M/S pin for 32-bit bus expansion, automatic power-down per port via CE, and dual interrupt/flag signaling (INTL/INTR) enabling mailbox-style inter-port messaging without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16-bit (1,048,576 bits total; A0–A15 addressing) |
| Access Time | 20 ns max - guarantees deterministic latency for real-time processor handshaking |
| Supply Voltage | 3.3 V ± 300 mV - compatible with modern low-voltage digital systems |
| Standby Current | 10 µA (ISB3, both ports at CMOS level) - enables battery-backed data retention |
| Operating Current | 115 mA typical (ICC, active mode) - defines thermal and power delivery requirements |
| Package | 100-pin TQFP - surface-mount compatible with standard PCB assembly processes |
| Temperature Range | 0°C to +70°C (Commercial) - validated for office and lab environments |
Pinout & Package
Package: 100-pin Thin Quad Plastic Flatpack (TQFP), 14 mm × 14 mm body, 0.5 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A15L / A0R–A15R | Address Inputs (Left/Right) | 16-bit address bus per port; A0–A15 required for 64K depth |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus (Left/Right) | 16-bit parallel data path per port; supports independent read/write cycles |
| CE0L/CE1L, CE0R/CE1R | Chip Enable (Dual-input logic) | CE = LOW only when CE0 ≤ VIL and CE1 ≥ VIH - prevents spurious enable |
| R/WL / R/WR | Read/Write Control (Left/Right) | HIGH = read, LOW = write; controls direction of data flow on I/O bus |
| OEL / OER | Output Enable (Left/Right) | Activates output drivers; allows three-state control per port independently |
| UBL / UBR, LBL / LBR | Byte Select (Upper/Lower) | Enables I/O8–I/O15 (upper) or I/O0–I/O7 (lower) - supports 8-bit sub-access |
| SEML / SEMR | Semaphore Enable | Activates 8 shared latches for software-controlled resource locking between ports |
| BUSYL / BUSYR | Busy Flag Output/Input | Indicates memory contention; output in master mode, input in slave mode |
| INTL / INTR | Interrupt Flag | Asynchronous signal for inter-port event notification (e.g., mailbox full) |
| M/S | Master/Slave Select | Configures device for 32-bit expansion without external logic or dedicated master chip |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Independent, fully asynchronous access to same memory location by two processors without arbitration delay penalties |
| On-Chip Arbitration Logic | Hardware-resolved BUSY flag generation with tBLA = 20 ns response - eliminates need for external priority encoder |
| Eight Semaphore Latches | Software-managed resource locking across ports; each latch controlled exclusively by one side at a time |
| Automatic Per-Port Power-Down | CE-driven sleep mode reduces ICC to ISB3 = 10 µA per idle port - critical for low-power embedded designs |
| Master/Slave Pin Configuration | M/S pin enables 32-bit bus expansion using identical CY7C028V-20AC devices - no BOM split required |
Applications
| Interprocessor Communication Buffer | Dual-Port Video Frame Store |
|---|---|
Use Scenario: Two microcontrollers exchange status and command data in real time without shared bus contention. IC Role / Device Role / Timing Role: Dual-port SRAM acts as shared memory buffer with hardware arbitration ensuring atomic read-modify-write sequences. Use Value: Eliminates need for external arbitration logic and reduces inter-processor latency to tBLA = 20 ns during address collision. | Use Scenario: Graphics controller writes frame data while display engine reads previous frame synchronously. IC Role / Device Role / Timing Role: Provides concurrent write-to-read access to pixel buffers with no pipeline stalls or FIFO overhead. Use Value: Enables zero-latency frame swapping using independent left/right ports - supports 60 Hz refresh without dropped frames. |
| Communications Protocol Stack Buffer | Industrial PLC Data Exchange Module |
Use Scenario: UART or Ethernet MAC layer stores incoming packet payloads while application layer processes prior packets. IC Role / Device Role / Timing Role: Acts as dual-access packet buffer with INTL/INTR flags signaling payload readiness between protocol layers. Use Value: Reduces CPU polling overhead by 100% via hardware interrupt-driven data availability signaling. | Use Scenario: PLC main CPU and I/O scan processor share sensor readings and actuator commands in deterministic cyclic execution. IC Role / Device Role / Timing Role: Serves as time-critical shared memory with semaphore-controlled access to prevent race conditions on shared variables. Use Value: Guarantees atomic update of 16-bit process variables using SEML/SEMR latches - meets IEC 61131-3 determinism requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT70V27L15PF | 15 ns access, 32K × 16, same TQFP-100 footprint but lacks M/S pin and has no built-in semaphores | Requires external arbitration logic for multi-device expansion; not suitable for semaphore-based resource sharing | Select when only faster access time is needed and system-level arbitration is already implemented |
| CY7C028V-25AC | 25 ns access, otherwise identical pinout, timing, and feature set; lower ICC (115 mA → 105 mA typ) and same ISB3 (10 µA) | Acceptable where 20 ns timing margin is unnecessary; improves power efficiency in non-real-time systems | Select for cost-sensitive or thermally constrained designs where 5 ns latency increase is acceptable |
Compared with IDT70V27L15PF and CY7C028V-25AC, the CY7C028V-20AC uniquely delivers 20 ns deterministic access with integrated semaphores and M/S expandability - making it optimal for tightly coupled multiprocessor systems requiring hardware-enforced synchronization.
Availability
CY7C028V-20AC is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame stores, and industrial PLC data exchange modules requiring stable component supply and long-term obsolescence management.
Supply support for CY7C028V-20AC 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 solutions for embedded systems.
The CY7C02xV series was designed specifically for high-reliability, low-latency interprocessor communication in real-time embedded systems - emphasizing hardware arbitration, deterministic timing, and seamless bus expansion.
FAQ
What is the minimum voltage required for data retention in CY7C028V-20AC?
Data retention is guaranteed down to 2.0 V on VCC, provided CE is held HIGH within VCC to VCC – 0.2 V. At 2.0 V, ICCDR1 is specified at 50 µA, enabling extended battery backup operation without data loss across the commercial temperature range.
How does the M/S pin affect bus expansion in CY7C028V-20AC?
When configured as Master (M/S = VIL), the device drives BUSY and controls arbitration for up to seven slave devices. As Slave (M/S = VIH), it responds to BUSY input and relinquishes control - enabling 32-bit or wider memory without external master logic or discrete glue components.
Can CY7C028V-20AC operate with mixed voltage interfaces?
No - all inputs and outputs are strictly 3.3 V CMOS/TTL compatible (VIH = 2.2 V min, VIL = 0.8 V max). It does not support 5 V tolerant or mixed-voltage I/O; interfacing with 5 V systems requires level-shifting circuitry on all control and data lines.
What is the functional difference between CE0/CE1 and single CE devices?
CE0 and CE1 form a dual-input enable gate: CE activates only when CE0 ≤ VIL *and* CE1 ≥ VIH. This prevents false enables due to noise or partial transitions, improving system robustness in electrically noisy industrial environments compared to single-pin CE architectures.
CY7C028V-20AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 1Mbit
- Memory Organization:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
CY7C028V-20AC FAQ
1.How can I place an order for CY7C028V-20AC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C028V-20AC 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 CY7C028V-20AC reliable?
The price and inventory of CY7C028V-20AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C028V-20AC is usually 5 days.
3.What payment methods are accepted for CY7C028V-20AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C028V-20AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C028V-20AC?
CY7C028V-20AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C028V-20AC 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 CY7C028V-20AC?
For technical support, including CY7C028V-20AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C028V-20AC requirements.
6.How does Aetrix verify that CY7C028V-20AC is sourced from the original manufacturer or authorized distributors?
All CY7C028V-20AC 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 CY7C028V-20AC meets industry standards.
7.What is the process for return or replacement of CY7C028V-20AC?
All CY7C028V-20AC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C028V-20AC, 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 CY7C028V-20AC part is unused and in its original packaging.
Return procedure for CY7C028V-20AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C028V-20AC Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
