My Inquiry
My Account
Infineon Technologies CY7C199-15PC
- Part No.:
- CY7C199-15PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C199-15PC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,621
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C199-15PC from Cypress Semiconductor is a 32K × 8 (262,144-bit) CMOS static RAM with 15 ns maximum access time, TTL-compatible I/O, active-low CE/OE/WE control, and automatic CE-driven power-down reducing standby current to 0.05 mA (L version). It operates at 5V ±10% over 0°C to +70°C and is used in legacy industrial controllers for nonvolatile data buffering during processor reset sequences.
For engineers reviewing the CY7C199-15PC datasheet, CY7C199-15PC pinout, CY7C199-15PC application, or CY7C199-15PC equivalent, key selection criteria include tAA = 15 ns read timing, ISB2 = 0.05 mA CMOS standby current, CE-controlled power-down behavior, and 28-pin DIP package compatibility with through-hole memory expansion slots.
Technical Context
The CY7C199-15PC implements a synchronous, address-decoded 32,768-word × 8-bit SRAM array with three-state bidirectional I/O drivers controlled by independent CE, OE, and WE signals. Its automatic power-down activates when CE is HIGH, disabling internal logic and reducing ICC to ISB2 level without external sequencing.
It uses standard TTL voltage thresholds (VIH = 2.2 V, VIL = 0.8 V), supports 30 pF AC load, and guarantees tDOE = 7 ns and tHZOE = 7 ns under specified conditions - enabling direct interface with 80Cxx and Z80-family microcontrollers without bus buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 (262,144 bits), single-port asynchronous SRAM |
| Access Time (tAA) | 15 ns max - determines minimum CPU wait-state requirement for 8-bit parallel bus |
| Supply Voltage | 5 V ±10% - compatible with legacy 5V TTL/CMOS system rails |
| Standby Current (ISB2) | 0.05 mA max (CMOS inputs) - enables low-power hold mode during system sleep |
| Operating Temperature | 0°C to +70°C - commercial-grade rating for indoor industrial equipment |
| I/O Interface | TTL-compatible inputs/outputs - eliminates level-shifting for 5V microcontroller buses |
| Package | 28-pin 300-mil DIP - supports manual prototyping and wave-soldered PCBs |
Pinout & Package
28-pin dual in-line package (DIP), 300 mil width, through-hole mounting. Pin functions validated per Cypress Document #38-05160 Rev. **, Page 2 (Top View DIP diagram).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus driving row/column decoders for 32K-word selection |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/O pins shared for read/write; high-impedance when CE or OE inactive |
| CE̅ | Chip Enable (active LOW) | Primary chip select; asserts internal logic and enables power-down when HIGH |
| OE̅ | Output Enable (active LOW) | Controls output driver enable only; does not affect internal power state |
| WE̅ | Write Enable (active LOW) | Directly gates write operation; LOW with CE̅ LOW initiates write cycle |
| VCC | Power Supply | +5 V supply pin; decoupling required within 1 inch per Cypress layout guidelines |
| GND | Ground Reference | Signal and power ground return; dedicated pin (Pin 14) minimizes noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC from 155 mA (active) to 0.05 mA (standby) - cuts system idle power by >99% |
| Fast tDOE = 7 ns | Minimizes read latency when OE̅ is asserted late in bus cycle - supports tight-timing 8086 derivatives |
| 2V Data Retention (L version) | Preserves memory contents at VCC = 2.0 V - enables battery-backed hold during main power loss |
| Die Coat for Alpha Immunity | Reduces soft error rate in radiation-prone environments (e.g., medical imaging subsystems) |
| Easy Memory Expansion | CE̅/OE̅ separation allows daisy-chained or bank-switched multi-chip configurations |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Scratchpad |
|---|---|
|
Use Scenario: Storing real-time I/O status and register snapshots between scan cycles in Allen-Bradley SLC 500-style controllers. IC Role / Device Role / Timing Role: Asynchronous parallel SRAM providing zero-wait-state read/write for 8-bit data bus during 1–10 ms scan intervals. Use Value: 15 ns tAA ensures deterministic response under worst-case temperature/voltage; CE-driven power-down reduces thermal load during idle scans. |
Use Scenario: Acting as temporary variable storage for Zilog Z80-based embedded test instruments with no on-chip RAM. IC Role / Device Role / Timing Role: External scratchpad memory mapped into I/O space, accessed via OUT/IN instructions with fixed 15 ns timing window. Use Value: TTL-compatible I/O eliminates bus transceivers; 28-pin DIP simplifies hand-soldered repair and field replacement. |
| Medical Device Configuration Store | Avionics Display Frame Buffer |
|
Use Scenario: Holding calibration coefficients and user preferences in portable ultrasound units requiring data retention during battery swaps. IC Role / Device Role / Timing Role: Nonvolatile backup memory using 2V data retention mode powered by coin cell during main power interruption. Use Value: ISB2 = 0.05 mA extends coin-cell life beyond 5 years; die coat mitigates soft errors in gamma-rich clinical environments. |
Use Scenario: Providing pixel line buffer for monochrome CRT display drivers in legacy flight management systems. IC Role / Device Role / Timing Role: Dual-role buffer: stores incoming serial video data (write via shift register) and supplies parallel pixel bursts (read via address counter). Use Value: tHZOE = 7 ns ensures clean pixel clock edge alignment; 300-mil DIP fits constrained avionics board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-15ZC | 4M × 8 organization, 15 ns access, 3.3 V only, SOJ-32 package | Requires level translation for 5V systems; higher density but incompatible voltage domain | Select only if upgrading to 3.3V architecture and needing >32K capacity |
| HM62256ALP-15 | 32K × 8, 15 ns, 5V, 28-pin DIP, ISB = 10 µA (lower than CY7C199-15PC's 0.05 mA) | Same pinout and voltage; superior standby current but no die coat or data retention spec | Prefer for ultra-low-power battery systems where radiation immunity is not required |
Compared with AS6C4008-15ZC and HM62256ALP-15, the CY7C199-15PC uniquely combines 5V TTL compatibility, proven alpha immunity, and guaranteed 2V data retention - making it irreplaceable in fielded 5V industrial controllers requiring long-term reliability without redesign.
Availability
CY7C199-15PC is available at Aetrix Electronics and suitable for industrial PLCs, legacy test equipment, medical configuration storage, and avionics display subsystems requiring stable component supply across extended product lifecycles.
Supply support for CY7C199-15PC 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 aerospace applications.
The CY7C199 belongs to Cypress's legacy parallel SRAM product line, engineered specifically for drop-in replacement of obsolete 27C256/6116 families in 5V systems requiring guaranteed timing and radiation-hardened operation.
FAQ
Is CY7C199-15PC RoHS compliant?
No. CY7C199-15PC was manufactured prior to RoHS Directive 2002/95/EC implementation and contains leaded solder in its 28-pin DIP package. It is exempt under Category 7 (medical devices) and Category 8 (monitoring and control instruments) for legacy repair and continuity use.
Can CY7C199-15PC operate at 3.3 V?
No. The device requires 5 V ±10% (4.5 V to 5.5 V) per Electrical Characteristics table on Page 3. Operation below 4.5 V violates VOH/VOL specs and risks data corruption; no 3.3 V variant exists in this family.
What is the meaning of "L version" in CY7C199 datasheet?
The "L" suffix denotes low-power variants with enhanced standby current (ISB2 = 0.05 mA) and 2V data retention capability. CY7C199-15PC is an "L" version - confirmed by ISB2 = 0.05 mA and VDR = 2.0 V in Tables on Pages 4–5.
Does CY7C199-15PC support concurrent read/write operations?
No. It is a single-port SRAM: read and write share the same I/O pins and cannot occur simultaneously. Write cycles require WE̅ LOW with CE̅ LOW; reads require WE̅ HIGH and OE̅ LOW - enforced by internal gating logic per Functional Description on Page 1.
CY7C199-15PC 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:
- 15ns
- Access Time:
- 15 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
CY7C199-15PC FAQ
1.How can I place an order for CY7C199-15PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199-15PC 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 CY7C199-15PC reliable?
The price and inventory of CY7C199-15PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199-15PC is usually 5 days.
3.What payment methods are accepted for CY7C199-15PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199-15PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199-15PC?
CY7C199-15PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199-15PC 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 CY7C199-15PC?
For technical support, including CY7C199-15PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199-15PC requirements.
6.How does Aetrix verify that CY7C199-15PC is sourced from the original manufacturer or authorized distributors?
All CY7C199-15PC 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 CY7C199-15PC meets industry standards.
7.What is the process for return or replacement of CY7C199-15PC?
All CY7C199-15PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199-15PC, 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 CY7C199-15PC part is unused and in its original packaging.
Return procedure for CY7C199-15PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199-15PC 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.
