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Infineon Technologies CY7C245A-18WMB
- Part No.:
- CY7C245A-18WMB
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 24-CDIP (0.300", 7.62mm) Window
- Datasheet:
-
CY7C245A-18WMB.pdf
- Description:
- IC EPROM 16KBIT PAR 24CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
CY7C245A-18WMB from Cypress Semiconductor is a 2K × 8 reprogrammable registered PROM with UV-erasable EPROM technology, integrated edge-triggered D-type register, and programmable synchronous/asynchronous output enable. It operates at 5V ±10%, delivers 12 ns clock-to-output delay and 18 ns address set-up time, and is housed in a 24-pin windowed ceramic DIP for field erasure and reprogramming. It serves as a direct TTL-compatible replacement for bipolar PROMs in microprogrammed control store applications.
For engineers reviewing the CY7C245A-18WMB datasheet, CY7C245A-18WMB pinout, CY7C245A-18WMB application, or CY7C245A-18WMB equivalent, key selection criteria include its 2049-word address space (including INIT byte), dual-mode output enable (E/ES), asynchronous INIT function, UV-erasability, and military-grade −55°C to +125°C operation in the W14 ceramic package.
Technical Context
The CY7C245A-18WMB implements a CMOS-based 2048-word × 8-bit EPROM array with on-chip master-slave D-type register, enabling pipelined read access synchronized to CP. Its architecture supports both asynchronous (E) and synchronous (ES) output enable modes, with ES requiring clock-edge timing and E allowing immediate tri-state control.
It features a dedicated INIT input that loads a user-programmable 2049th 8-bit word into the register independent of CP, supporting power-up preset/clear functions. Erasure requires 2537 Å UV light at ≥25 W·sec/cm² through the ceramic window, and programming uses 12.5 V VPP with intelligent byte-wide algorithms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 × 8 bits + 1 programmable INIT word (2049th location) |
| Access Timing | 18 ns address set-up (tSA), 12 ns clock-to-output (tCO) - defines minimum system clock cycle for registered read |
| Supply Voltage | 5 V ±10% - compatible with standard TTL logic rails and military power systems |
| Operating Temperature | −55°C to +125°C - qualified for extended military and harsh-environment embedded use |
| Output Enable Modes | Programmable asynchronous (E) or synchronous (ES) - determines whether output disable is immediate or clock-synchronized |
| UV Erasure Dose | ≥25 W·sec/cm² at 2537 Å - specifies minimum UV exposure for full cell reset prior to reprogramming |
| Static Discharge Rating | >2001 V (MIL-STD-883 Method 3015) - ensures robust handling in manual assembly and field maintenance |
Pinout & Package
Package: 24-pin windowed ceramic DIP (W14), 300-mil width, hermetically sealed with UV-transparent quartz window for field erasure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus selecting one of 2048 memory locations or INIT word (A10 = HIGH selects INIT) |
| O0–O7 | Data Outputs | Registered 8-bit bidirectional outputs driven by slave flip-flops; tri-stated when E = HIGH or ES = HIGH on next CP edge |
| CP | Clock Input | Positive-edge-triggered clock synchronizing data transfer from master to slave register and output update |
| E / ES | Output Enable | Pin 12 (E) = asynchronous enable; pin 13 (ES) = synchronous enable - only one programmed active; determines output control timing |
| INIT | Asynchronous Initialize | Active-low input loading INIT word into register immediately, overriding CP and enable state - used for power-up initialization |
| VCC, GND | Power Supply | Pin 24 (VCC) and Pin 12 (GND) - 5 V ±10% supply with decoupling required per MIL-STD-806 |
| VPP, PGM, VFY | Programming Control | Pins 7 (VPP), 18 (PGM), 20 (VFY) - support 12.5 V programming voltage, program pulse, and verify mode during reprogramming |
Key Features
| Feature | Design Value |
|---|---|
| UV-erasable windowed ceramic package | Enables unlimited field reprogramming after exposure to 2537 Å UV light - eliminates need for socket replacement in deployed systems |
| On-chip edge-triggered register | Eliminates external latch requirement in microprogrammed controllers, reducing board area and propagation delay uncertainty |
| Programmable E/ES output enable | Allows system-level timing flexibility: E enables immediate output disable; ES enables clock-synchronized output gating for deterministic bus arbitration |
| User-programmable INIT word | Provides deterministic power-on output state (Preset/Clear) without external logic or boot firmware intervention |
| TTL-compatible I/O with 5 V supply | Direct interface with legacy 74LS/ALS logic families and microprocessor buses without level-shifting circuitry |
Applications
| Microprogrammed Control Store | Boot ROM for RISC Processors |
|---|---|
|
Use Scenario: Storing microcode sequences for hardwired control units in military avionics computers where field updates are infrequent but critical. IC Role / Device Role / Timing Role: Registered PROM providing pipelined instruction fetch synchronized to system clock, with INIT ensuring known microcode entry point at power-up. Use Value: Eliminates external register and reduces timing skew between address decode and instruction latching, improving maximum clock frequency by up to 15% versus unregistered PROMs. |
Use Scenario: Storing initial boot vector and diagnostic routines in radiation-tolerant spaceborne processors operating across −55°C to +125°C. IC Role / Device Role / Timing Role: Nonvolatile boot memory with guaranteed AC timing under extreme temperature, using UV window for post-launch firmware patching if needed. Use Value: Windowed CerDIP construction provides hermetic sealing and verified UV erasability - essential for mission-critical reprogramming in orbit where replacement is impossible. |
| Industrial PLC Sequence Logic | Military Data Acquisition Firmware |
|
Use Scenario: Holding ladder logic translation tables and I/O mapping definitions in programmable logic controllers deployed in oil refinery control cabinets. IC Role / Device Role / Timing Role: Synchronous output enable (ES) mode ensures deterministic timing of sequence step transitions aligned to PLC scan clock edges. Use Value: Synchronous enable prevents metastability during rapid I/O state changes, eliminating spurious output glitches during hot-swappable module insertion. |
Use Scenario: Storing calibration coefficients and sensor linearization tables in airborne telemetry modules subjected to thermal cycling and ESD events. IC Role / Device Role / Timing Role: High-ESD-rated (＞2001 V) registered PROM delivering stable coefficient reads during analog-to-digital conversion cycles. Use Value: Guaranteed 12 ns tCO and 18 ns tSA ensure coefficient fetch completes within single ADC conversion window, preventing pipeline stalls in real-time sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered PROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-12DC | 27C-series EPROM, unregistered, 32K × 8, 12 ns access, no on-chip register or INIT function | Lacks pipelined output and power-up initialization - requires external latch and reset logic | Select when higher density and lower cost are prioritized over timing determinism and boot reliability |
| DS2502-100+ | 1K-bit 1-Wire EEPROM, serial interface, no parallel bus, no register, 5 V tolerant | Serial configuration only; incompatible pinout and protocol - not a drop-in replacement | Select only for low-pin-count, field-upgradable firmware storage where bandwidth and parallel access are unnecessary |
Compared with AM27C256B-12DC and DS2502-100+, the CY7C245A-18WMB uniquely integrates registration, INIT, and UV erasability in a military-qualified 24-pin DIP - making it irreplaceable where deterministic timing, field reprogrammability, and rugged packaging are jointly required.
Availability
CY7C245A-18WMB is available at Aetrix Electronics and suitable for microprogrammed control stores, boot ROMs for radiation-hardened processors, and industrial PLC sequence logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY7C245A-18WMB 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 high-reliability memory, programmable logic, and mixed-signal ICs for industrial, aerospace, and defense applications.
The CY7C245A belongs to Cypress's registered PROM product line, designed specifically to replace aging bipolar PROMs in military and industrial control systems while delivering lower power, field reprogrammability, and guaranteed AC timing performance.
FAQ
What is the purpose of the INIT pin on the CY7C245A-18WMB?
The INIT pin is an active-low asynchronous input that immediately loads a user-programmed 8-bit word (stored at address 2048) into the on-chip register, independent of the clock signal. This enables deterministic power-up output states-either PRESET (all HIGH), CLEAR (all LOW), or any custom pattern-without relying on external reset circuitry or software initialization.
How does the synchronous (ES) vs. asynchronous (E) output enable differ in practice?
When using asynchronous enable (E), outputs go to high-impedance immediately upon E = HIGH, regardless of CP. With synchronous enable (ES), outputs remain active until the next rising edge of CP after ES = HIGH, enabling precise clock-aligned bus release. The device is factory-programmed for one mode only-E or ES-but not both simultaneously.
Can the CY7C245A-18WMB be reprogrammed in-system?
No. Reprogramming requires removal from the circuit board, exposure to UV light (≥25 W·sec/cm² at 2537 Å) through the ceramic window for full erasure, then parallel programming using 12.5 V VPP on dedicated pins (7, 18, 20). It lacks in-system programming capability or serial interface.
What is the significance of the "WMB" suffix in CY7C245A-18WMB?
The "WMB" suffix denotes a 24-pin windowed ceramic DIP (W14 package) qualified for military temperature range (−55°C to +125°C) and screened to MIL-STD-883 requirements. "W" = windowed, "M" = military, "B" = standard screening level - distinguishing it from commercial (JC), industrial (JI), or plastic (PC) variants.
CY7C245A-18WMB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-CDIP (0.300", 7.62mm) Window
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - UV
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 18 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-CERDIP
CY7C245A-18WMB FAQ
1.How can I place an order for CY7C245A-18WMB through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C245A-18WMB 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 CY7C245A-18WMB reliable?
The price and inventory of CY7C245A-18WMB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C245A-18WMB is usually 5 days.
3.What payment methods are accepted for CY7C245A-18WMB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C245A-18WMB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C245A-18WMB?
CY7C245A-18WMB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C245A-18WMB 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 CY7C245A-18WMB?
For technical support, including CY7C245A-18WMB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C245A-18WMB requirements.
6.How does Aetrix verify that CY7C245A-18WMB is sourced from the original manufacturer or authorized distributors?
All CY7C245A-18WMB 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 CY7C245A-18WMB meets industry standards.
7.What is the process for return or replacement of CY7C245A-18WMB?
All CY7C245A-18WMB units undergo pre-shipment inspection (PSI). If there is an issue with CY7C245A-18WMB, 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 CY7C245A-18WMB part is unused and in its original packaging.
Return procedure for CY7C245A-18WMB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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