My Inquiry
My Account
Infineon Technologies CY7C199C-12ZXCT
- Part No.:
- CY7C199C-12ZXCT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY7C199C-12ZXCT.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:2,467
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C199C-12ZXCT from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 12 ns access time, 5.0V ±10% supply operation, TTL-compatible I/Os, and automatic CE-controlled power-down. It serves as a high-speed, low-power data buffer or working memory in microcontroller-based instrumentation and legacy industrial controllers.
For engineers reviewing the CY7C199C-12ZXCT datasheet, CY7C199C-12ZXCT pinout, CY7C199C-12ZXCT application, or CY7C199C-12ZXCT equivalent, key selection criteria include guaranteed 12 ns read cycle timing, 2.0V data retention capability, CMOS standby current ≤10 µA, and compatibility with 28-pin SOJ/TSOP I/DIP footprints across commercial and industrial temperature grades.
Technical Context
The CY7C199C-12ZXCT implements a fully asynchronous SRAM architecture with independent address decoding, sense amplifier array, and tri-state I/O buffers controlled by CE, OE, and WE. Its power-down circuitry activates automatically when CE remains HIGH, reducing ICC to ≤10 µA without external control logic.
It supports three distinct read modes (OE-controlled, CE-controlled, and simultaneous OE/CE active) and two write modes (WE-controlled and CE-controlled), with all timing parameters-tRC, tAA, tACE, tDOE, and tPD-guaranteed at 12 ns under VCC = 4.5–5.5V and TA = 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data interface compatible with 8-bit microcontrollers and legacy bus architectures |
| Access Time (tAA) | 12 ns - enables direct interfacing with 8051, Z80, and 68000-family CPUs running at ≤25 MHz system clocks |
| Supply Voltage | 4.5V to 5.5V - supports standard 5V TTL/CMOS logic domains without level-shifting |
| Data Retention Voltage | 2.0V - allows battery-backed operation during main power loss while preserving contents |
| Standby Current (ISB2) | 10 µA - reduces system-level quiescent power in sleep-mode embedded controllers |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade instrumentation and office automation equipment |
| Input/Output Compatibility | TTL-compatible - ensures direct connection to 74LS/74F logic families without interface buffers |
Pinout & Package
Package: 28-pin TSOP I (8 mm × 13.4 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus accepting 0–32767 row/column select; no internal latching required |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit TTL-compatible data path; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low master enable; triggers automatic power-down when HIGH |
| OE | Output Enable | Active-low control for output buffer; does not affect power state |
| WE | Write Enable | Active-low signal initiating write cycle; overlaps with CE to define write window |
| VCC | Power Supply | +5.0V ±10% core supply; decoupling capacitor required per datasheet layout guidelines |
| VSS | Ground | Signal and power reference plane; requires low-inductance connection to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns guaranteed access time | Meets timing budgets of 25 MHz CPU buses without wait states in read cycles |
| Automatic CE power-down | Reduces ICC from 85 mA to 10 µA without external control signals or firmware intervention |
| 2.0V data retention | Preserves stored values during brown-out or backup-battery operation without refresh |
| TTL-compatible I/O levels | Eliminates need for level translators when interfacing with legacy 74-series logic or microprocessor peripherals |
| Three package options | Enables drop-in replacement across DIP (prototyping), SOJ (legacy PCBs), and TSOP I (space-constrained designs) |
Applications
| Industrial PLC I/O Buffer | Legacy Medical Instrument Memory |
|---|---|
Use Scenario: Stores real-time sensor readings and control setpoints in modular PLC backplanes with 8-bit parallel buses. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state data storage between CPU and field I/O modules. Use Value: 12 ns access ensures deterministic response within 100 µs scan cycles; 2.0V retention maintains safety-critical configuration during brief AC outages. | Use Scenario: Holds calibration tables and patient waveform history in portable ECG analyzers using Z80-based controllers. IC Role / Device Role / Timing Role: Byte-addressable working memory supporting burst reads of analog-to-digital sample buffers. Use Value: TTL-compatible I/O eliminates interface logic; 10 µA standby current extends battery life beyond 72 hours in sleep mode. |
| Automated Test Equipment (ATE) Pattern RAM | Point-of-Sale Terminal Firmware Cache |
Use Scenario: Stores digital stimulus patterns for semiconductor functional testers operating at 20 MHz clock rates. IC Role / Device Role / Timing Role: High-speed static RAM acting as pattern sequencer memory synchronized to test controller strobes. Use Value: Guaranteed 12 ns tRC and tAA allow full-speed pattern delivery without pipeline stalls or timing margin violations. | Use Scenario: Caches frequently accessed inventory lookup tables and transaction logs in embedded ARM7-based POS terminals. IC Role / Device Role / Timing Role: Non-volatile-retained cache memory bridging slow flash storage and fast CPU execution. Use Value: Automatic CE power-down cuts idle power by >99.9% versus active SRAM, enabling fanless thermal design. |
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-12TQLI | 16-bit bus (256K × 16), 3.3V only, 12 ns access, LVCMOS I/O | Requires bus-width adaptation and voltage translation for 5V systems | Preferred for new 3.3V designs needing higher density; not pin-compatible |
| ON Semiconductor MCM6295DW12 | Same 32K × 8 organization, 5V, 12 ns, but DIP-only packaging and obsolete status | Limited to through-hole prototyping; no TSOP I or RoHS-compliant variants available | Acceptable for legacy repair only; no long-term supply assurance |
Compared with IS61LV25616AL-12TQLI and MCM6295DW12, the CY7C199C-12ZXCT uniquely combines 5V TTL compatibility, TSOP I packaging, and guaranteed 2.0V data retention-making it irreplaceable in cost-sensitive, space-constrained, battery-backed 5V industrial systems.
Availability
CY7C199C-12ZXCT is available at Aetrix Electronics and suitable for industrial PLC I/O buffering, legacy medical instrument memory, and automated test equipment pattern storage requiring stable component supply and long-lifecycle support.
Supply support for CY7C199C-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 markets.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for drop-in replacement of aging 28-pin 5V SRAMs in cost-sensitive, non-upgradable embedded systems.
FAQ
Is CY7C199C-12ZXCT compatible with 3.3V systems?
No. The CY7C199C-12ZXCT operates exclusively at 5.0V ±10% (4.5V–5.5V). Its input thresholds (VIH ≥ 2.2V, VIL ≤ 0.8V) and output drive strength are specified only for 5V logic families. Interfacing with 3.3V controllers requires level-shifting circuitry.
Does this device require an external clock or refresh circuitry?
No. The CY7C199C-12ZXCT is a true static RAM: it retains data indefinitely as long as VCC is applied and requires no clock signal or periodic refresh cycles. Its asynchronous interface responds directly to CE, OE, and WE transitions.
What is the maximum junction temperature during continuous operation?
The absolute maximum junction temperature is +125°C, derived from the ambient rating (–40°C to +85°C industrial grade) and ΘJA = 88.6°C/W for TSOP I. At 85°C ambient and 85 mA operating current, junction temperature reaches ~115°C-within safe margin if board layout follows Cypress's thermal guidelines.
Can CY7C199C-12ZXCT be used in battery-backed applications?
Yes. With guaranteed data retention down to 2.0V VCC and standby current ≤10 µA, it supports battery-backup schemes using coin cells or supercapacitors. Retention time depends on backup source capacity and leakage, but the device itself imposes no minimum voltage or current threshold beyond the 2.0V specification.
CY7C199C-12ZXCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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:
- 28-TSOP I
CY7C199C-12ZXCT FAQ
1.How can I place an order for CY7C199C-12ZXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-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 CY7C199C-12ZXCT reliable?
The price and inventory of CY7C199C-12ZXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-12ZXCT is usually 5 days.
3.What payment methods are accepted for CY7C199C-12ZXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-12ZXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-12ZXCT?
CY7C199C-12ZXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-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 CY7C199C-12ZXCT?
For technical support, including CY7C199C-12ZXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-12ZXCT requirements.
6.How does Aetrix verify that CY7C199C-12ZXCT is sourced from the original manufacturer or authorized distributors?
All CY7C199C-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 CY7C199C-12ZXCT meets industry standards.
7.What is the process for return or replacement of CY7C199C-12ZXCT?
All CY7C199C-12ZXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-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 CY7C199C-12ZXCT part is unused and in its original packaging.
Return procedure for CY7C199C-12ZXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199C-12ZXCT 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
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
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.
