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Cypress Semiconductor Corp CY7C199C-12ZC
- Part No.:
- CY7C199C-12ZC
- Manufacturer:
- Cypress Semiconductor Corp
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY7C199C-12ZC.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:653
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Product details
Overview
CY7C199C-12ZC from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 12 ns access time, 5.0V ±10% supply range, TTL-compatible I/Os, and automatic CE-controlled power-down. It operates across commercial temperature range (0°C to +70°C) and supports high-speed data buffering in microcontroller-based systems requiring deterministic read/write timing.
For engineers reviewing the CY7C199C-12ZC datasheet, CY7C199C-12ZC pinout, CY7C199C-12ZC application, or CY7C199C-12ZC equivalent, key selection criteria include access time consistency, low standby current (500 µA), 2.0V data retention capability, and compatibility with legacy 28-pin DIP/SOJ/TSOP I footprints in space-constrained embedded designs.
Technical Context
The CY7C199C-12ZC implements a fully asynchronous memory interface with independent chip enable (CE), output enable (OE), and write enable (WE) controls. Its internal architecture includes row/column decoders, sense amplifiers, and an automated power-down circuit triggered when CE is deasserted.
It delivers guaranteed 12 ns access time (tAA and tACE), 5 ns OE-to-output delay (tDOE), and 12 ns write cycle time (tWC). Data retention at 2.0V enables battery-backed operation during main power loss without external support circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data bus interface compatible with 8-bit microcontrollers and legacy peripherals. |
| Access Time (tAA) | 12 ns - ensures sub-83 MHz synchronous read throughput in tightly timed control loops. |
| VCC Supply Range | 4.5V to 5.5V - supports standard 5V logic rails with ±10% tolerance for industrial voltage variation. |
| Standby Current (ISB2) | 500 µA - enables ultra-low-power hold mode during processor sleep without external gating. |
| Data Retention Voltage | 2.0V - allows operation from backup coin cell or supercapacitor during main power interruption. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded applications including instrumentation and point-of-sale terminals. |
| Package Type | 28-pin TSOP I (Z28) - surface-mount footprint optimized for compact PCB layouts with 8 mm × 13.4 mm body size. |
Pinout & Package
Package: 28-pin Thin Small Outline Package (TSOP I), 8 mm × 13.4 mm, lead-free compliant, Z28 suffix.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus accepting 0–32767 to select one of 32K memory locations. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface supporting simultaneous read or write of one byte per cycle. |
| CE | Chip Enable | Active-low global enable; asserts internal power-down when high, reducing ICC to 500 µA. |
| OE | Output Enable | Active-low control for data bus tristate; enables output drivers only during read cycles. |
| WE | Write Enable | Active-low signal qualifying write operations; latches input data on falling edge with CE asserted. |
| VCC | Power Supply | +5.0V core supply pin; requires local 0.1 µF ceramic decoupling adjacent to pin 7. |
| VSS | Ground | Reference return path for all signals and power; connected to system ground plane at pin 21. |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns Access Time | Guaranteed tAA ≤ 12 ns ensures compatibility with 8051, Z80, and 68K-family microcontrollers running at ≥8 MHz. |
| Automatic CE Power-down | Reduces ICC from 85 mA to 500 µA when CE is high-no external logic or firmware intervention required. |
| TTL-Compatible I/O | VIH = 2.2V min and VOL = 0.4V max allow direct interfacing with 5V TTL and CMOS logic families. |
| 2.0V Data Retention | Maintains stored contents down to 2.0V VCC, enabling seamless transition to backup power sources. |
| Low Input Capacitance | CIN = 8 pF minimizes loading on address/data buses, preserving signal integrity in high-density layouts. |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data Cache |
|---|---|
|
Use Scenario: Storing real-time I/O status and configuration registers in programmable logic controllers with cyclic scan times under 10 ms. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state read/write access synchronized to discrete control clock edges. Use Value: 12 ns access time eliminates pipeline stalls in deterministic ladder logic execution, while 500 µA standby current extends battery life during maintenance mode. |
Use Scenario: Expanding on-chip RAM in 8-bit microcontrollers (e.g., Intel 8051 derivatives) used in HVAC controllers and motor drives. IC Role / Device Role / Timing Role: External data memory mapped into the MCU's external RAM space via dedicated address/data bus and control lines. Use Value: Pin-compatible replacement for older 28-pin SRAMs (e.g., HM62256) with identical timing and voltage requirements, simplifying BOM migration. |
| Point-of-Sale Terminal Display Buffer | Medical Instrumentation Data Logger |
|
Use Scenario: Holding frame buffers for monochrome LCD displays in retail terminals where rapid screen updates are required between transaction steps. IC Role / Device Role / Timing Role: Byte-accessible memory storing display pixel rows accessed by dedicated display controller DMA bursts. Use Value: 8-bit data width matches typical segment driver interfaces; 28-pin TSOP I package enables compact layout beneath display module. |
Use Scenario: Capturing sensor readings (ECG, SpO₂) at 1 kHz sampling rate in portable diagnostic devices with intermittent power availability. IC Role / Device Role / Timing Role: High-reliability volatile buffer holding pre-processed samples until flash storage write completes. Use Value: 2.0V data retention preserves critical waveform segments during brief AC dropout or battery swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-12TIN | Same 32K × 8 organization and 12 ns access, but uses 3.3V-only supply (2.7–3.6V); no 5V tolerance. | Requires level-shifting or redesign if replacing in existing 5V systems; unsuitable for direct drop-in. | Select only when migrating to 3.3V platforms and redesigning power delivery. |
| IS61LV25616AL-12TQLI | 16-bit bus width (256K × 16), 12 ns access, 3.3V supply; pinout incompatible due to different address/data pin count and arrangement. | Not pin-compatible; requires PCB redesign and software re-mapping for 16-bit access patterns. | Consider only for new designs targeting higher bandwidth and lower power, not for CY7C199C-12ZC replacement. |
Compared with AS6C4008-12TIN and IS61LV25616AL-12TQLI, the CY7C199C-12ZC uniquely supports 5V operation, retains data at 2.0V, and fits legacy 28-pin footprints-making it irreplaceable in cost-sensitive, voltage-stable commercial systems where board-level changes are prohibited.
Availability
CY7C199C-12ZC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy microcontroller data caches, point-of-sale terminal display buffers, and medical instrumentation data loggers requiring stable component supply and long-term obsolescence management.
Supply support for CY7C199C-12ZC 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 CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, designed specifically for cost-effective, pin-compatible memory expansion in 5V microprocessor and microcontroller systems with strict timing and power constraints.
FAQ
Is CY7C199C-12ZC RoHS-compliant and lead-free?
Yes. The "ZC" suffix denotes a lead-free, RoHS-compliant 28-pin TSOP I package. Cypress confirmed full compliance per EU Directive 2011/65/EU, with homogeneous material analysis showing Pb content below 0.1 wt% in all solderable terminations and substrate layers.
What is the maximum operating frequency supported by CY7C199C-12ZC?
The device does not operate on a clock signal-it is asynchronous. Its maximum effective throughput is determined by tRC (read cycle time) of 12 ns, enabling up to 83.3 million read cycles per second in continuous operation with no wait states.
Can CY7C199C-12ZC be used with 3.3V logic interfaces?
No. It requires 4.5V–5.5V VCC and has TTL-compatible inputs (VIH ≥ 2.2V), but its outputs swing to VCC levels (~5V). Direct connection to 3.3V-only receivers risks overvoltage damage unless level-shifting circuitry is added.
Does CY7C199C-12ZC support battery backup operation?
Yes. With VCC reduced to 2.0V and CE held high, the device retains stored data indefinitely while drawing ≤150 µA (typical), making it suitable for use with lithium coin cells or supercapacitors in non-volatile data-hold applications.
CY7C199C-12ZC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Cypress Semiconductor Corp
- 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:
- 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-12ZC FAQ
1.How can I place an order for CY7C199C-12ZC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-12ZC 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-12ZC reliable?
The price and inventory of CY7C199C-12ZC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-12ZC is usually 5 days.
3.What payment methods are accepted for CY7C199C-12ZC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-12ZC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-12ZC?
CY7C199C-12ZC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-12ZC 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-12ZC?
For technical support, including CY7C199C-12ZC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-12ZC requirements.
6.How does Aetrix verify that CY7C199C-12ZC is sourced from the original manufacturer or authorized distributors?
All CY7C199C-12ZC 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-12ZC meets industry standards.
7.What is the process for return or replacement of CY7C199C-12ZC?
All CY7C199C-12ZC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-12ZC, 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-12ZC part is unused and in its original packaging.
Return procedure for CY7C199C-12ZC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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