CY7C199C-15VC Equivalent & Substitute Parts

Part Overview

The CY7C199C-15VC is a 256Kbit asynchronous SRAM memory IC manufactured by Infineon Technologies, organized as 32K x 8 with parallel interface and 15 ns access time. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the CY7C199C-15VC is determined by the following critical parameters:

Memory capacity and organization (256Kbit, 32K x 8 configuration)
Parallel interface architecture
Package compatibility (28-BSOJ form factor)
Supply voltage range (4.5V ~ 5.5V)
Access time equal to or faster than 15 ns
Surface mount mounting type

The IS61C256AL-12JLI meets all substitution criteria. It maintains identical memory capacity, organization, interface type, and package form factor. The 12 ns access time is faster than the original 15 ns specification, providing improved performance margin. Supply voltage compatibility and surface mount packaging ensure direct functional replacement in existing PCB designs.

Parameter Comparison

Parameter	CY7C199C-15VC (Main)	IS61C256AL-12JLI (Substitute)
Manufacturer	Infineon Technologies	ISSI (Integrated Silicon Solution Inc)
Memory Size	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8
Memory Type	Volatile SRAM	Volatile SRAM
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
Package / Case	28-BSOJ (0.300", 7.62mm Width)	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature Range	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The IS61C256AL-12JLI is a direct functional equivalent for the CY7C199C-15VC. Selection should be based on the following factors:

Product Availability: The CY7C199C-15VC is obsolete. The IS61C256AL-12JLI is active and maintains current manufacturing status, ensuring long-term availability for production and field replacement scenarios.

Compliance Status: The IS61C256AL-12JLI is ROHS3 compliant, whereas the CY7C199C-15VC is non-compliant. For applications subject to RoHS regulations, the substitute part satisfies compliance requirements.

Performance Characteristics: The IS61C256AL-12JLI provides 12 ns access and write cycle times, which are faster than the original 15 ns specification. This performance improvement is backward compatible and introduces no timing conflicts in systems designed for the original part.

Operating Temperature Range: The IS61C256AL-12JLI supports -40°C ~ 85°C operation, exceeding the original 0°C ~ 70°C range. This extended range provides greater flexibility for applications requiring wider temperature operation.

Package and Interface Compatibility: Both parts use identical 28-BSOJ packaging and parallel interface architecture, enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the IS61C256AL-12JLI replace the CY7C199C-15VC in existing designs?

A: Yes. The IS61C256AL-12JLI is a direct substitute. It maintains identical memory capacity (256Kbit, 32K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), and 28-BSOJ package form factor. No PCB modifications are required.

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

A: The 12 ns access time of the IS61C256AL-12JLI is faster than the original 15 ns specification. This provides improved performance margin and is fully backward compatible with systems designed for 15 ns operation. No timing conflicts occur.

Q: Are there any temperature range considerations?

A: The IS61C256AL-12JLI operates across -40°C ~ 85°C, compared to the original 0°C ~ 70°C range. For applications operating within 0°C ~ 70°C, both parts are equivalent. For extended temperature applications, the substitute part offers broader operational capability.

Q: What is the impact of RoHS compliance differences?

A: The CY7C199C-15VC is RoHS non-compliant, while the IS61C256AL-12JLI is ROHS3 compliant. For applications or markets requiring RoHS compliance, the substitute part satisfies regulatory requirements. For legacy systems without compliance mandates, both parts function identically.

Q: Are the moisture sensitivity levels equivalent?

A: Yes. Both parts have identical Moisture Sensitivity Level (MSL) rating of 3 (168 Hours), requiring identical handling and storage protocols.

Q: Why is the CY7C199C-15VC obsolete?

A: The CY7C199C-15VC is classified as obsolete by the manufacturer. The IS61C256AL-12JLI, with active product status, ensures continued availability for maintenance, repair, and new production requirements.

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