CY7C199-15VC Equivalent & Substitute Parts

Part Overview

The CY7C199-15VC is a 256Kbit asynchronous SRAM memory IC manufactured by Infineon Technologies, organized as 32K x 8 with a 15 ns access time and parallel interface. This component operates at 4.5V to 5.5V supply voltage and is housed in a 28-SOJ surface mount package. The part is classified as obsolete, making identification of compatible substitutes essential for system maintenance, repair, and legacy equipment support.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	15 ns
Write Cycle Time	15 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the CY7C199-15VC is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must provide 256Kbit capacity in 32K x 8 configuration to maintain address and data bus compatibility.
Memory Interface Type: Parallel interface is mandatory; no serial or other interface types are acceptable.
Package & Pinout: 28-SOJ package with identical physical dimensions (0.300", 7.62mm width) ensures mechanical and electrical compatibility on the PCB.
Voltage Supply Range: Supply voltage must encompass or match the 4.5V ~ 5.5V range to ensure operation within the host system's power delivery specifications.
Access Time: Substitute parts with equal or faster access time (≤15 ns) maintain or improve system timing performance.

The IS61C256AL-12JLI meets all substitution criteria, offering identical memory capacity, organization, interface type, and package configuration with improved access time performance.

Parameter Comparison

Parameter	CY7C199-15VC (Main Part)	IS61C256AL-12JLI (Substitute)
Manufacturer	Infineon Technologies	ISSI (Integrated Silicon Solution Inc)
Memory Type	Volatile SRAM	Volatile SRAM
Memory Size	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8
Memory Interface	Parallel	Parallel
Access Time	15 ns	12 ns
Write Cycle Time	15 ns	12 ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature Range	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	28-BSOJ (0.300", 7.62mm Width)	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The IS61C256AL-12JLI is a direct functional substitute for the CY7C199-15VC based on the following engineering criteria:

Electrical Compatibility: Identical memory capacity, organization, interface type, and supply voltage range ensure seamless integration into existing circuit designs without modification.
Timing Performance: The 12 ns access and write cycle times of the IS61C256AL-12JLI are faster than the 15 ns specification of the CY7C199-15VC, providing improved or equivalent system performance.
Package Compatibility: Both parts use the 28-BSOJ surface mount package with identical physical dimensions, allowing direct PCB placement without layout changes.
Product Status & Compliance: The IS61C256AL-12JLI is active in production and ROHS3 compliant, whereas the CY7C199-15VC is obsolete and RoHS non-compliant. This makes the ISSI part the preferred choice for new designs and legacy system repairs requiring modern component standards.
Temperature Range: The IS61C256AL-12JLI supports an extended operating temperature range (-40°C ~ 85°C) compared to the CY7C199-15VC (0°C ~ 70°C), providing greater operational flexibility in demanding environments.

Frequently Asked Questions (FAQ)

Q: Can the IS61C256AL-12JLI replace the CY7C199-15VC without PCB modifications?

A: Yes. Both parts share identical pinout, package dimensions (28-BSOJ), and electrical interface specifications. Direct substitution on the PCB is possible without layout or schematic changes.

Q: What is the impact of the faster access time (12 ns vs. 15 ns)?

A: The faster access time of the IS61C256AL-12JLI improves or maintains system timing performance. Systems designed for the 15 ns CY7C199-15VC will operate correctly with the 12 ns substitute without timing violations.

Q: Are the supply voltage requirements identical?

A: Yes. Both parts operate within the 4.5V ~ 5.5V supply voltage range, ensuring compatibility with existing power delivery circuits.

Q: Why is the operating temperature range different?

A: The IS61C256AL-12JLI supports -40°C ~ 85°C, while the CY7C199-15VC supports 0°C ~ 70°C. The wider range of the substitute provides greater flexibility for applications in extreme temperature environments. Systems operating within the original 0°C ~ 70°C range will function correctly with either part.

Q: What is the significance of RoHS compliance?

A: The IS61C256AL-12JLI is ROHS3 compliant, meeting modern environmental and regulatory standards. The CY7C199-15VC is RoHS non-compliant. For new designs and systems subject to RoHS regulations, the ISSI substitute is the appropriate choice.

Q: Are moisture sensitivity levels compatible?

A: Yes. Both parts have an MSL rating of 3 (168 Hours), indicating identical moisture handling and storage requirements.

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