Cypress Semiconductor Corp CY7C145-35JC

Mfr. Part

CY7C145-35JC

Manufacturer

Cypress Semiconductor

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Detailed Description

72 Kbit asynchronous dual-port SRAM for 5 V systems. Organization 8K x 9 with true dual-port architecture, allowing two independent buses to access the same memory concurrently. 35 ns access time and 35 ns write cycle. Parallel interface, surface-mount PLCC with J-leads. Commercial temperature grade 0°C to 70°C. RoHS non-compliant legacy device.

Key Features

True dual-port SRAM, asynchronous operation

8K x 9 organization for byte plus parity or control bit usage

35 ns access time, 35 ns write cycle time

Separate address, data, and control lines for each port

Busy and semaphore features for collision avoidance and simple arbitration

Parallel interface, TTL/CMOS compatible logic levels

5 V supply operation (4.5 V to 5.5 V)

Fully static design, no refresh required

Commercial temperature range 0°C to 70°C

Base product family CY7C145

Key Advantages

Enables simultaneous access by two processors or controllers without complex external glue logic

Fast 35 ns access for low-latency shared memory designs

Simple, proven 5 V design ideal for legacy and maintenance programs

Built-in arbitration (busy/semaphore) reduces firmware complexity and race conditions

9-bit width supports parity or flag bits for error checking or control

Drop-in dual-port solution saves board space versus discrete arbitration logic

Packaging

Type: 68-PLCC / 68-LCC with J-leads, surface mount

Material: Molded plastic PLCC body with tin/lead J-leads (legacy finish; check datasheet for exact alloy)

Size: 24.23 mm x 24.23 mm nominal body

Pin configuration: 68 pins, with duplicated sets of signals for Port A and Port B (address lines A0–A12 and B0–B12, data I/O for each port D0–D8, control pins such as CE, OE, R/W per port, busy/semaphore lines, VCC and GND). Refer to the datasheet for the exact pinout.

Thermal characteristics: Commercial operating ambient 0°C to 70°C (TA). Use standard PLCC thermal design practices; consult datasheet for package thermal details.

Electrical properties: VCC 4.5 V to 5.5 V, access time 35 ns, write cycle 35 ns, asynchronous parallel interface, volatile SRAM technology.

Lifecycle

Status: Legacy 5 V dual-port SRAM. RoHS non-compliant, limited new production availability in the market. It may be approaching Not Recommended for New Designs in some channels.

Direct family alternatives (same organization and function, different speeds/packages may apply):

- CY7C145 family variants with faster speed grades (for example -25 or -20) and different temperature grades or packages depending on availability

Cross-brand equivalents and alternates (verify pinout and timing before substitution):

- Renesas (IDT) IDT7162 series, 8K x 9 dual-port asynchronous SRAM, 5 V (e.g., IDT7162, IDT7162S, IDT7162LA)

- Renesas IDT7160 series, 8K x 8 dual-port asynchronous SRAM, 5 V, if the ninth bit is not required

If you need a one-to-one equivalent or a current-production alternative, please contact our sales team via the Y-IC website. We will help you confirm compatibility and sourcing.

Key Application Areas

Shared-memory multiprocessing and co-processing

FPGA and MCU/DSP interprocessor communication

Telecom and networking equipment using parity or control bits

Industrial control, motion control, and PLC systems

Video, imaging, and buffering systems needing concurrent access

Legacy equipment maintenance and spares for 5 V systems

Datasheet

Y-IC hosts the most authoritative datasheet for CY7C145-35JC. We strongly recommend downloading it from this page to get exact pinouts, timing, and electrical specifications.

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