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Infineon Technologies CY7C199C-20ZI
- Part No.:
- CY7C199C-20ZI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY7C199C-20ZI.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:4,868
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Product details
Overview
CY7C199C-20ZI from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 20 ns access time, 5.0V ±10% supply range, TTL-compatible I/Os, and automatic CE-controlled power-down. It operates across industrial temperature (–40°C to +85°C), delivers 75 mA max operating current, and retains data at 2.0V. Used in legacy embedded controllers and FPGA configuration memory buffers.
For engineers reviewing the CY7C199C-20ZI datasheet, CY7C199C-20ZI pinout, CY7C199C-20ZI application, or CY7C199C-20ZI equivalent, key selection criteria include access time consistency, CE-triggered low-power mode, industrial-grade voltage tolerance, and TSOP I package compatibility with space-constrained PCB layouts.
Technical Context
The CY7C199C-20ZI implements a fully asynchronous SRAM interface with independent CE, OE, and WE controls enabling flexible read/write sequencing. Its internal architecture includes row/column decoders, sense amplifiers, and an automated power-down circuit activated when CE is deasserted.
It supports two distinct read modes (CE-controlled and OE-controlled) and two write modes (WE-controlled and CE-controlled), with timing parameters tightly specified for tRC (20 ns), tAA (20 ns), tHZCE (9 ns), and tPD (20 ns). Data retention is guaranteed at VCC = 2.0V with ≤150 µA ICCDR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data bus interface without external demultiplexing |
| Access Time (tAA) | 20 ns - determines minimum clock-to-data latency in microcontroller or FPGA glue logic |
| Supply Voltage Range | 4.5V to 5.5V - ensures robust operation across industrial power rail variations |
| Standby Current (ISB2) | 500 µA - enables ultra-low-power hold state during system sleep with CE high |
| Data Retention Voltage | 2.0V - allows memory contents to persist during brown-out or backup battery operation |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom line cards |
| Output Drive Strength | IOL = 8.0 mA / IOH = –4.0 mA - meets TTL load requirements without external buffers |
Pinout & Package
Package: 28-pin TSOP I (8 mm × 13.4 mm), lead-free, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-word addressing; no multiplexing required |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path with high-impedance tri-state control via OE/CE/WE |
| CE | Chip Enable | Primary device select; triggers automatic power-down when high (TTL/CMOS compatible threshold) |
| OE | Output Enable | Controls output buffer enable; does not affect power state - used for read gating only |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CE is asserted and OE is high |
| VCC | Power Supply | +5.0V core supply; decoupling required within 10 mm of pin 7 per layout guidelines |
| VSS | Ground | Signal and power ground reference; connected to pin 21 for low-inductance return path |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces standby current to 500 µA without external control logic or sleep-mode firmware overhead |
| TTL-Compatible I/O | Eliminates level-shifting components when interfacing with legacy 5V microcontrollers and FPGAs |
| 2.0V Data Retention | Preserves RAM contents during main supply interruption, enabling fast wake-from-brownout recovery |
| Multiple Package Options | TSOP I footprint (Z28) supports high-density PCB layouts; also available in DIP and SOJ for prototyping and repair |
| Industrial Temperature Rating | Validated operation from –40°C to +85°C ensures reliability in uncontrolled environments like factory floors and outdoor enclosures |
Applications
| Industrial PLC Memory Buffer | FPGA Configuration Storage |
|---|---|
Use Scenario: Stores real-time I/O mapping tables and process state variables in programmable logic controllers with intermittent power cycles. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing deterministic 20 ns read/write access for scan-cycle execution. Use Value: Enables zero-latency state restoration after brief power loss due to 2.0V data retention and CE-driven auto-sleep. | Use Scenario: Holds partial reconfiguration bitstreams for Xilinx Spartan or Lattice MachXO FPGAs during field updates. IC Role / Device Role / Timing Role: Non-volatile configuration cache accessed via parallel bus during FPGA boot or dynamic reconfig sequences. Use Value: Eliminates need for external serial flash buffering; TTL-compatible I/O simplifies interface to FPGA's dedicated configuration pins. |
| Legacy Microcontroller Expansion | Telecom Line Card Data Log |
Use Scenario: Adds external RAM to 8051- or Z80-based systems where on-chip memory is insufficient for protocol stack buffers. IC Role / Device Role / Timing Role: Memory-mapped peripheral responding to address decode logic with CE/Ax inputs. Use Value: Matches 5V bus timing without wait states; 28-pin TSOP I fits tight board spacing constraints typical in retro-computing upgrades. | Use Scenario: Captures error logs and diagnostic snapshots in E1/T1 line interface units requiring persistent storage between resets. IC Role / Device Role / Timing Role: Dual-port accessible memory bank written by DSP core and read by management MCU over shared bus. Use Value: Industrial temp rating and 500 µA standby current support 24/7 operation in fanless telecom chassis with thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS61LV25616AL-20TQLI | 32K × 16 organization, 3.3V-only supply, 20 ns access, 32-pin TSOP II | Requires data bus width adaptation; incompatible with 5V systems and 28-pin footprints | Select only if migrating to 3.3V architecture and needing 16-bit data path |
| ON Semiconductor MCM6295DZP | 32K × 8, 5V, 25 ns access, 28-pin DIP only, no data retention spec | Lacks 2.0V retention and TSOP I option; higher 100 µA standby current | Acceptable for cost-sensitive DIP-based prototypes where retention and low power are non-critical |
Compared with IS61LV25616AL-20TQLI and MCM6295DZP, the CY7C199C-20ZI uniquely combines 5V tolerance, 28-pin TSOP I packaging, 20 ns speed, and guaranteed 2.0V data retention - making it irreplaceable in industrial 5V systems requiring compact, low-power, drop-in SRAM.
Availability
CY7C199C-20ZI is available at Aetrix Electronics and suitable for industrial PLC memory buffers, FPGA configuration storage, and legacy microcontroller expansion requiring stable component supply across extended product lifecycles.
Supply support for CY7C199C-20ZI 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 markets.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for 5V systems needing deterministic timing, low-power deselected operation, and long-term obsolescence resilience in mission-critical embedded applications.
FAQ
Is CY7C199C-20ZI RoHS compliant?
Yes. The "ZI" suffix denotes lead-free, RoHS-compliant construction per EU Directive 2011/65/EU. The TSOP I package uses matte tin terminations and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements for standard SMT assembly.
Can CY7C199C-20ZI operate at 3.3V?
No. The device is specified only for 5.0V ±10% (4.5V–5.5V). Operation below 4.5V violates DC electrical specifications: VIH minimum drops to 2.2V, but VCC < 4.5V risks failure of internal logic thresholds and invalidates tAA/tRC timing guarantees.
What is the maximum clock frequency supported for burst reads?
The CY7C199C-20ZI is asynchronous - it has no clock input. Maximum effective throughput is governed by tRC = 20 ns, yielding up to 50 MHz sustained random-access rate. Burst reads require external address sequencing; no internal burst counter or page mode is implemented.
Does CY7C199C-20ZI support battery backup operation?
Yes. With VCC reduced to 2.0V and CE held high, the device retains data while drawing ≤150 µA (ICC DR). This mode requires external circuitry to switch VCC to a backup source (e.g., coin cell) upon main supply failure, and is validated per datasheet Note 8 for the "L-version" - which includes the -20ZI variant.
CY7C199C-20ZI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Bag
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP I
CY7C199C-20ZI FAQ
1.How can I place an order for CY7C199C-20ZI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-20ZI 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 CY7C199C-20ZI reliable?
The price and inventory of CY7C199C-20ZI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-20ZI is usually 5 days.
3.What payment methods are accepted for CY7C199C-20ZI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-20ZI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-20ZI?
CY7C199C-20ZI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-20ZI 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 CY7C199C-20ZI?
For technical support, including CY7C199C-20ZI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-20ZI requirements.
6.How does Aetrix verify that CY7C199C-20ZI is sourced from the original manufacturer or authorized distributors?
All CY7C199C-20ZI 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 CY7C199C-20ZI meets industry standards.
7.What is the process for return or replacement of CY7C199C-20ZI?
All CY7C199C-20ZI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-20ZI, 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 CY7C199C-20ZI part is unused and in its original packaging.
Return procedure for CY7C199C-20ZI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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