Renesas 7143SA20PF8

Overview

7143SA20PF8 from IDT is a high-speed 2K × 16 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous independent read/write access on left and right ports with 20 ns maximum read cycle time (commercial grade), 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables 32-bit-or-wider bus width expansion without external logic in real-time embedded controllers.

For engineers reviewing the 7143SA20PF8 datasheet, 7143SA20PF8 pinout, 7143SA20PF8 application, or 7143SA20PF8 equivalent, key selection considerations include BUSY input behavior (not output), byte-selectable write control per port, 68-pin PLCC package compatibility, and low-power active/standby current specs for battery-backed systems.

Technical Context

The 7143SA20PF8 operates as a SLAVE dual-port SRAM with BUSY pin functioning exclusively as an input - unlike the MASTER IDT7133 - enabling hardware arbitration via external BUSY signal from a MASTER device. It supports independent address, control, and I/O buses on both ports, permitting concurrent non-contention reads/writes.

Its timing architecture includes dedicated R/WLUB/R/WLLB and R/WRUB/R/WRLB controls for upper/lower byte writes per port, and full TTL compatibility with single 5 V supply. The device enters low-power standby when CE is high, drawing ≤25 mA (ISB1) under TTL-level inputs at max frequency.

Key Specifications

Pinout & Package

7143SA20PF8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, PLG68) with 0.95″ × 0.95″ footprint and 0.17″ height. Both VCC and GND pins must be connected for reliable operation per datasheet Note 1–2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with IDT7133SA20PF8, the 7143SA20PF8 provides no arbitration logic and relies on external BUSY signaling - making it strictly a SLAVE component. Against CY7C1362V-20AXC, it trades integrated arbitration for legacy PLCC compatibility and proven field reliability in MIL-PRF-38535-compliant systems.

Availability

7143SA20PF8 is available at Aetrix Electronics and suitable for real-time dual-CPU systems, industrial motion controllers, and automotive engine control units requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 7143SA20PF8 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

IDT (Integrated Device Technology) is a semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.

The IDT7143 product line delivers SLAVE-configured dual-port SRAMs designed specifically for width-expansion architectures with external arbitration - targeting high-reliability embedded systems where deterministic memory access and legacy package compatibility are critical.

FAQ

What is the role of 7143SA20PF8 in a MASTER/SLAVE dual-port RAM system?

The 7143SA20PF8 functions exclusively as a SLAVE device: its BUSY pins (BUSYL/BUSYR) are inputs that accept arbitration signals from a MASTER IDT7133. It does not generate BUSY outputs. This architecture eliminates "busy lock-out" in multi-chip width-expanded systems by centralizing arbitration in one MASTER chip while allowing multiple SLAVES to respond synchronously to the same BUSY signal - ensuring deterministic resolution of port contention without external logic.

Can 7143SA20PF8 operate independently without a MASTER device?

Yes, 7143SA20PF8 can operate as a standalone dual-port SRAM when BUSY functionality is disabled - by tying both BUSYL and BUSYR pins HIGH. In this mode, it behaves as a fully asynchronous 2K × 16 memory with independent left/right port access, but loses hardware write-inhibit protection during simultaneous accesses to the same address. This configuration is valid for applications where software-managed access or non-overlapping address spaces eliminate contention risk.

What is the significance of the 'PF8' suffix in 7143SA20PF8?

The 'PF8' suffix denotes the 68-pin PLCC (Plastic Leaded Chip Carrier) package variant with standard lead finish (Pb-free, RoHS-compliant). It corresponds to the PLG68 mechanical outline specified in the datasheet, distinguishing it from other package options like ceramic PGA (PG), flatpack (FP), or 100-pin TQFP (PNG). The '8' indicates the standard lead finish per IDT's ordering nomenclature - critical for thermal and solderability validation in industrial reflow processes.

How does 7143SA20PF8 handle power consumption during standby?

7143SA20PF8 achieves low standby power via dual CE-controlled gating: when CEL and CER are both HIGH, the device draws ≤25 mA (ISB1, commercial/industrial) at maximum operating frequency. Under CMOS-level standby (CE > VCC − 0.2 V), current drops to ≤1.0 mA (ISB3 typ.). This staged power-down supports battery-backed retention in systems requiring >10-year data hold at 2 V - though note that 7143SA20PF8 is the SA (standard power) variant, not LA (low-power), so retention capability is limited compared to LA versions.

Is 7143SA20PF8 pin-compatible with other members of the IDT7143 family?

Yes, all IDT7143 variants - including 7143SA20PF8, 7143SA25PF8, and 7143LA35PF8 - share identical 68-pin PLCC pinouts and signal assignments per datasheet Section "Pin Configurations". Differences are limited to speed grade (20 ns vs. 25 ns), power class (SA vs. LA), and temperature screening - allowing direct substitution in existing layouts when timing and power budgets permit, provided BUSY logic and voltage compliance are verified.