Infineon Technologies CY7C1356C-166AXIT

Overview

CY7C1356C-166AXIT from Cypress Semiconductor is a 9-Mbit (512K × 18) synchronous pipelined SRAM with NoBL™ architecture, designed for high-throughput memory subsystems in networking and telecom ASIC/FPGA interfaces. It operates at 166 MHz with zero wait states, supports 3.3 V core supply and 2.5/3.3 V I/O, and delivers 3.5 ns clock-to-output access time in a Pb-free 100-pin TQFP package.

For engineers reviewing the CY7C1356C-166AXIT datasheet, CY7C1356C-166AXIT pinout, CY7C1356C-166AXIT application, or CY7C1356C-166AXIT equivalent, this device serves as a drop-in replacement for ZBT SRAMs in burst-capable, low-latency data-path designs requiring guaranteed back-to-back read/write cycles without bus turnaround penalty.

Technical Context

The CY7C1356C-166AXIT implements fully registered synchronous operation: all address, control, and data inputs are latched on the rising edge of CLK, and all outputs pass through output registers synchronized to the same edge. Its NoBL™ logic eliminates bus latency by enabling consecutive read/write operations with data valid every cycle.

Burst capability supports both linear and interleaved orders via the MODE strap pin; byte write control (BWa–BWb) enables selective 18-bit word updates; and CEN provides synchronous clock gating without chip deselection. The device includes IEEE 1149.1 JTAG boundary scan and supports ZZ sleep mode for standby current reduction to 40 mA.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Package (TQFP), 14 mm × 20 mm body, 1.4 mm height, Pb-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous pipelined SRAM applications.

Compared with IDT72V2115L16PF and IS61WV51218BLL-166TQLI, the CY7C1356C-166AXIT uniquely combines VDDQ voltage flexibility, MODE-selectable burst order, and integrated JTAG - making it the only option supporting both 2.5 V FPGA I/O and IEEE 1149.1 testability in TQFP form factor.

Availability

CY7C1356C-166AXIT is available at Aetrix Electronics and suitable for packet buffering in network switches, FPGA-based protocol accelerators, telecom line card buffers, and real-time video frame stores requiring stable component supply across extended production lifecycles.

Supply support for CY7C1356C-166AXIT 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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable system-on-chip solutions for industrial, automotive, and communications markets.

The CY7C1356C belongs to Cypress's NoBL™ SRAM product line, engineered specifically for zero-latency, burst-capable memory subsystems in high-speed digital signal processing and packet-forwarding applications.

FAQ

What is the function of the MODE pin on CY7C1356C-166AXIT?

The MODE pin is a static configuration input that selects burst addressing order: pulled HIGH for interleaved burst (required by some telecom standards), or LOW for linear burst. It must be set at power-up and held stable during operation - no dynamic switching is supported. This pin directly controls internal address counter sequencing and cannot be changed mid-operation.

Does CY7C1356C-166AXIT support 2.5 V I/O while operating at 3.3 V core voltage?

Yes. The device uses separate VDD (3.3 V) and VDDQ (2.5 V or 3.3 V) supplies. When VDDQ = 2.5 V, all DQ pins and byte write inputs operate at 2.5 V logic levels, enabling direct connection to 2.5 V FPGA I/O banks without level shifters - confirmed in DC characteristics tables and AC switching specifications for 2.5 V conditions.

How does the ZZ (sleep) mode affect data retention and wake-up time?

In ZZ mode (pin driven LOW), the device enters deep sleep with ICC reduced to ≤40 mA while retaining all stored data. Wake-up is synchronous: the first valid CLK edge after ZZ returns HIGH initiates internal recovery, and normal access resumes after one additional clock cycle - no external reset or initialization sequence is required.

Can CY7C1356C-166AXIT be used as a pin-for-pin replacement for ZBT SRAMs?

Yes - the datasheet explicitly states pin compatibility and functional equivalence with ZBT SRAMs. Key matching features include identical pinout (including ADV/LD, CEN, BWx, and OE behavior), same NoBL™ burst timing, and compatible control signal timing windows. No PCB redesign is needed when migrating from ZBT-166 devices.