Renesas 71V546S133PFG8

Overview

71V546S133PFG8 from Integrated Device Technology is a 3.3V, 128K × 36-bit (4.5 Mbit) synchronous SRAM with Zero Bus Turnaround (ZBT™) architecture, pipelined outputs, and 4-word burst capability. It operates at 133 MHz (7.5 ns clock cycle), delivers 4.2 ns clock-to-data access, and supports linear/interleaved burst ordering via LBO pin - used in high-speed packet buffering and network switch fabric memory subsystems.

For engineers reviewing the 71V546S133PFG8 datasheet, 71V546S133PFG8 pinout, 71V546S133PFG8 application, or 71V546S133PFG8 equivalent, key selection criteria include ZBT™ bus turnaround elimination, synchronous 3.3V operation with CEN-controlled clock gating, individual byte write (BW1–BW4), and JEDEC-standard 100-pin TQFP packaging for board-level timing-critical designs.

Technical Context

The 71V546S133PFG8 implements a fully synchronous, clock-edge-triggered architecture where address, control, and data registers are all sampled on the rising edge of CLK. Its ZBT™ feature eliminates dead cycles between read/write transitions by decoupling bus direction control from external OE management - internal registered outputs remove need for OE timing coordination.

It integrates a synchronous burst counter with ADV/LD-driven address load/increment logic and LBO-configurable linear or interleaved 4-word burst sequences. Three chip enables (CE1, CE2 low-active; CE2 high-active) support depth expansion, while CEN suspends all synchronous operation without affecting output state.

Key Specifications

Pinout & Package

71V546S133PFG8 is packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body size, with exposed pad not present (standard plastic package). Pin functions are fully synchronous except OE (asynchronous) and LBO (static DC input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV133BZC and AS7C3256A-133JCIN, the 71V546S133PFG8 uniquely combines ZBT™ zero-turnaround, synchronous burst addressing, and 36-bit width - delivering higher effective bandwidth in packet-processing pipelines where sequential burst access dominates.

Availability

71V546S133PFG8 is available at Aetrix Electronics and suitable for network packet buffering, switch fabric memory, and telecom line card caching requiring stable component supply, industrial temperature compliance, and long-term obsolescence management.

Supply support for 71V546S133PFG8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The IDT71V546 product line was designed specifically for high-speed, low-latency memory subsystems in networking and telecom infrastructure - emphasizing ZBT™ architecture, burst efficiency, and robust 3.3V synchronous operation.

FAQ

What does the 'S133' suffix in 71V546S133PFG8 indicate?

The 'S133' suffix denotes the speed grade: 133 MHz maximum operating frequency, corresponding to a 7.5 ns clock cycle time and 4.2 ns clock-to-data access (tCD). This is confirmed in the AC Electrical Characteristics table (Table 23) of the official IDT datasheet DSC-3821/07, where 71V546S133 specifies tCYC ≤ 7.5 ns and tCD ≤ 4.2 ns. The 71V546S133PFG8 meets these timing specs across industrial temperature range.

Does 71V546S133PFG8 require external output enable (OE) control in normal operation?

No - the 71V546S133PFG8 uses internally synchronized registered outputs, eliminating the need for active OE control during standard read/write cycles. OE is asynchronous and optional; it can be tied low permanently for simplified design. The ZBT™ architecture relies on synchronous timing rather than OE assertion to manage output states, as stated in the Features section and Functional Description of the datasheet.

How does the ZBT™ feature in 71V546S133PFG8 eliminate bus turnaround cycles?

The ZBT™ feature in 71V546S133PFG8 removes dead cycles between read and write operations by decoupling bus direction control from external signaling. Since outputs are internally registered and OE is optional, the device transitions seamlessly between read and write bursts using only ADV/LD and R/W - no external bus transceiver control or OE strobing is needed, as verified in the Truth Table (Table 7) and Functional Description.

What is the function of the ADV/LD and LBO pins on 71V546S133PFG8?

ADV/LD is a synchronous input that loads a new external address when LOW, or advances the internal burst counter when HIGH - enabling ZBT™ burst sequencing. LBO is a static DC input selecting linear (LBO = LOW) or interleaved (LBO = HIGH) 4-word burst order, as defined in Tables 9 and 10 of the datasheet. Both pins are critical to burst-mode operation and must be driven to valid logic levels.

Is 71V546S133PFG8 pin-compatible with other members of the IDT71V546 family?

Yes - all IDT71V546 variants (e.g., 71V546S100, 71V546S133) share identical 100-pin TQFP pinout and electrical interface. Differences are limited to speed grade (tCYC, tCD) and AC timing parameters; DC characteristics, pin functions, and functional behavior (ZBT™, burst, byte write) remain consistent across the family, as confirmed in the Pin Configuration diagram (Figure 2) and Pin Description Summary (Table 1).