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Infineon Technologies CY7C1399BN-20ZXC — Memory (DRAM / SRAM / Flash / EEPROM)

Cypress CY7C1399BN-20ZXC 256Kbit Async SRAM, 20 ns

MPNCY7C1399BN-20ZXC
Obsolete

Cypress CY7C1399BN-20ZXC, 256Kbit asynchronous SRAM organized 32K × 8, 20 ns access time, 3.0–3.6 V supply, 28-TSOP I surface-mount package, 0°C to 70°C operating temperature.

Infineon Technologies CY7C1399BN-20ZXC datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

CY7C1399BN-20ZXC specifications
ParameterValue
Memory typeVolatile
MountingSurface Mount
Voltage3V ~ 3.6V
Memory interfaceParallel
Operating temperature0°C~70°C(TA)
PackageTray
TechnologySRAM - Asynchronous
Access time20 ns
Memory size256Kbit
Memory formatSRAM
Case28-TSSOP (0.465\", 11.80mm Width)
Memory organization32K x 8
Write cycle time - word, page20ns

Product details

The Cypress CY7C1399BN-20ZXC is a 256Kbit asynchronous SRAM organized as 32K × 8, operating from 3.0 V to 3.6 V with a 20 ns access time. This part is used as a byte-wide fast static RAM for cache, buffer, or scratchpad memory in embedded systems, telecom equipment, and legacy controller designs where parallel bus access at 20 ns is required.

32K × 8 organization and parallel interface

Organized as 32K words of 8 bits each, this SRAM presents a byte-wide parallel interface with separate address and data buses. The write cycle time matches the access time at 20 ns.

The commercial temperature grade limits this part to controlled indoor environments — office equipment, telecom racks with HVAC, or consumer electronics. Not rated for automotive under-hood, outdoor base stations, or industrial enclosures where ambient may exceed 70°C.

Frequently asked questions

Is CY7C1399BN-20ZXC obsolete?

Yes, the CY7C1399BN-20ZXC is obsolete. Cypress has discontinued production, and no last-time-buy window remains. The part is only available through independent surplus and broker channels.

What is the replacement for CY7C1399BN-20ZXC?

Cypress has not published an official replacement part number for the CY7C1399BN-20ZXC. For a pin-compatible alternative, check the 32K × 8 async SRAM offerings from Alliance, ISSI, or IDT in the same 28-TSOP I package — verify the pinout and timing against your design.

What is the operating temperature range of CY7C1399BN-20ZXC?

The CY7C1399BN-20ZXC is rated for 0°C to 70°C ambient operating temperature (commercial grade).

What is CY7C1399BN-20ZXC's listed package?

The CY7C1399BN-20ZXC ships in a 28-TSOP I surface-mount package (0.465 inch body width) and is supplied in Tray packaging.