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Infineon Technologies CY7C199C-25PC
- Part No.:
- CY7C199C-25PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C199C-25PC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,170
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Product details
Overview
CY7C199C-25PC from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 25 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 legacy microprocessor bus interfaces in embedded controllers and industrial instrumentation.
For engineers reviewing the CY7C199C-25PC datasheet, CY7C199C-25PC pinout, CY7C199C-25PC application, or CY7C199C-25PC equivalent, key selection criteria include access time consistency at 25 ns, low standby current (500 µA), 2.0V data retention capability, and compatibility with 28-pin DIP packaging for through-hole PCB integration.
Technical Context
The CY7C199C-25PC 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 supports two primary read modes (CE-controlled and OE-controlled) and two write modes (WE-controlled and CE-controlled), with timing parameters fully specified for 25 ns operation - including tRC = 25 ns, tAA = 25 ns, tACE = 25 ns, and tHZCE = 9 ns - ensuring deterministic bus timing in non-pipelined systems.
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) | 25 ns - guarantees data validity within 25 ns after address stabilization, meeting timing budgets for 20 MHz bus systems |
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5V TTL/CMOS logic domains without level-shifting |
| Standby Current (ISB2) | 500 µA - enables low-power hold mode during processor idle cycles without external power gating |
| Data Retention Voltage | 2.0 V - maintains stored data during brown-out or controlled power-down sequences |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded applications with no derating required |
| Input/Output Compatibility | TTL-compatible - ensures direct interfacing with 74LS, 74F, and early microprocessor families (e.g., Z80, 8085) |
Pinout & Package
Package: 28-pin plastic DIP (Dual In-line Package), 0.6-inch width, through-hole mountable. Pin pitch: 0.1 inch (2.54 mm).
| Pin/Terminal | 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 data path supporting read and write transfers without separate data direction control |
| CE | Chip Enable | Active-low global enable; disables all internal operations and activates automatic power-down when high |
| OE | Output Enable | Active-low control for data bus drivers; places I/O pins in high-impedance state when disabled |
| WE | Write Enable | Active-low signal initiating write cycle; latches data on rising edge when CE is asserted |
| VCC | Power Supply | +5V core supply; must be stable within ±10% to meet AC timing and DC leakage specifications |
| VSS | Ground Reference | 0V return path for all signals and internal circuitry; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces ICC to 500 µA when CE is deasserted - eliminates need for external sleep-mode logic |
| 2.0V Data Retention | Maintains valid memory contents during brown-out or backup battery operation below nominal VCC |
| TTL-Compatible I/O | Accepts standard 0.8V/2.0V logic thresholds and drives 4mA HIGH / 8mA LOW - interoperable with legacy logic families |
| Multiple Package Options | 28-pin DIP variant (P21) supports prototyping, repair, and legacy board rework without redesign |
| Low Input Capacitance | 8 pF max per input pin - minimizes bus loading and preserves signal integrity on long traces |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
Use Scenario: Stores real-time I/O status and control registers in programmable logic controllers with 8-bit data buses. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state data storage for scan-cycle execution. Use Value: 25 ns access time ensures full register read/write completion within single CPU clock cycle at ≤20 MHz bus speed. | Use Scenario: Serves as main working RAM for Z80- or 8085-based embedded systems where external memory expansion is required. IC Role / Device Role / Timing Role: Standalone static RAM interfaced directly to address/data bus without glue logic or wait-state generation. Use Value: TTL-compatible signaling and 28-pin DIP package enable drop-in replacement of older HM6116 or MK4802 devices. |
| Medical Instrument Data Log Buffer | Test Equipment Configuration Storage |
Use Scenario: Captures sensor readings and calibration coefficients in portable diagnostic devices operating under intermittent power. IC Role / Device Role / Timing Role: Nonvolatile-retentive memory holding critical configuration data during power cycling. Use Value: 2.0V data retention allows continued data integrity during 5V supply sag or battery switchover events. | Use Scenario: Stores instrument setup parameters and user preferences in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-power standby SRAM preserving settings between power-on cycles without backup capacitor or battery. Use Value: 500 µA ISB2 current enables >1-year retention on coin-cell backup without voltage regulation overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-25ZIN | 25 ns access, 5V-only (no ±10% tolerance), 300 µA ISB, 28-pin SOJ only | Lacks DIP package; lower standby current but narrower voltage margin | Select if SOJ footprint is fixed and tighter VCC regulation is available |
| IS61LV25616AL-25TQLI | 25 ns access, 3.3V supply, 32K × 16 organization, 44-pin TSOP II | Wider data bus, different voltage domain, incompatible pinout and package | Choose only when migrating to 3.3V systems and requiring 16-bit data path |
Compared with AS6C4008-25ZIN and IS61LV25616AL-25TQLI, the CY7C199C-25PC uniquely combines 5V ±10% operation, 28-pin DIP availability, and 2.0V data retention - making it irreplaceable in legacy 5V designs requiring physical and electrical backward compatibility.
Availability
CY7C199C-25PC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy microcontroller data RAM, and medical instrument data log buffers requiring stable component supply and long-term obsolescence support.
Supply support for CY7C199C-25PC 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 embedded markets.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for pin- and function-compatible replacement of aging 28-pin 5V SRAMs in cost-sensitive, long-lifecycle industrial systems.
FAQ
Is CY7C199C-25PC RoHS-compliant?
Yes. The CY7C199C-25PC is offered in a lead-free 28-pin DIP variant (documented in the datasheet Rev. *B as "Also available in Lead-Free 28 DIP"). It meets RoHS Directive 2011/65/EU requirements with homogeneous lead content below 1000 ppm and no restricted substances above threshold limits.
Can CY7C199C-25PC operate at 4.5V while maintaining 25 ns access time?
Yes. The device is fully characterized across 4.5V to 5.5V. All AC timing parameters-including tAA = 25 ns and tRC = 25 ns-are guaranteed at VCC = 4.5V and TA = 70°C, per the "DC Electrical Characteristics Over the Operating Range (–25)" table on page 5 of the datasheet.
What is the maximum capacitive load the I/O pins can drive reliably?
The CY7C199C-25PC specifies output drive strength of IOH = –4.0 mA and IOL = 8.0 mA at VCC = 4.5V. With typical output impedance of ~30 Ω and 8 pF pin capacitance, it reliably drives up to 30 pF total load (including trace and receiver input capacitance) while meeting tDOE ≤ 9 ns and VOL ≤ 0.4 V.
Does CY7C199C-25PC require external pull-up resistors on control lines?
No. All control inputs (CE, OE, WE) have TTL-compatible thresholds and do not require external pull-ups. Internal input leakage is ±5 µA (IIX), and VIH/VIL specs ensure robust noise margins without external biasing - provided PCB layout avoids floating nodes and excessive trace length.
CY7C199C-25PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
CY7C199C-25PC FAQ
1.How can I place an order for CY7C199C-25PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-25PC 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-25PC reliable?
The price and inventory of CY7C199C-25PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-25PC is usually 5 days.
3.What payment methods are accepted for CY7C199C-25PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-25PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-25PC?
CY7C199C-25PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-25PC 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-25PC?
For technical support, including CY7C199C-25PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-25PC requirements.
6.How does Aetrix verify that CY7C199C-25PC is sourced from the original manufacturer or authorized distributors?
All CY7C199C-25PC 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-25PC meets industry standards.
7.What is the process for return or replacement of CY7C199C-25PC?
All CY7C199C-25PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-25PC, 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-25PC part is unused and in its original packaging.
Return procedure for CY7C199C-25PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199C-25PC Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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