Renesas IDT70824L20PF

Overview

IDT70824L20PF from Integrated Device Technology is a high-speed 4K × 16-bit Sequential Access Random Access Memory (SARAM™) with dual-port architecture: asynchronous random-access port and synchronous sequential-access port. It delivers 20 ns random-access access time (tAA), 20 ns sequential-access cycle delay (tCD), and 1 mW standby power consumption. Used in real-time data buffering for PCI-based communication controllers requiring concurrent burst and random memory access.

For engineers reviewing the IDT70824L20PF datasheet, IDT70824L20PF pinout, IDT70824L20PF application, or IDT70824L20PF equivalent, this page provides verified package mapping (80-pin TQFP), confirmed dual-port timing behavior, battery-backed data retention at 2V, TTL-compatible 5V operation, and exact buffer control register addressing per CMD mode.

Technical Context

The IDT70824L20PF implements a true dual-port RAM cell architecture with independent control paths: one port uses standard asynchronous SRAM timing (CE/OE/R/W/LB/UB), while the other uses clocked synchronous logic (SCLK/SCE/SR/W/CNTEN) with internal address pointer and two programmable buffers. Both ports share the same 4096-word × 16-bit memory array but operate concurrently without arbitration logic.

Buffer management is handled via dedicated CMD-mode registers accessed through A0–A2 and I/O0–I/O11, supporting START/END address loading for Buffer #1 and #2, flow control (BUFFER CHAINING or STOP), and EOB flag clearing. The sequential port supports automatic pointer incrementing, address load via SLD or SSTRT1/SSTRT2, and end-of-buffer detection with asynchronous RST reset.

Key Specifications

Pinout & Package

80-pin Thin Quad Flatpack (TQFP), PN80-1 package; body size 14 mm × 14 mm × 1.4 mm; seven VCC and ten GND pins for low-noise power distribution and signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20AXC and IDT70V24L20PF, the IDT70824L20PF uniquely integrates sequential access logic, dual-buffer flow control, and 2V data retention in a 5V-compatible 80-pin TQFP - making it irreplaceable for applications requiring hardware-accelerated burst+random memory access without external glue logic.

Availability

IDT70824L20PF is available at Aetrix Electronics and suitable for PCI bridge buffering, DSP co-processing, industrial motion control, avionics data acquisition, and real-time communications systems requiring stable component supply across extended product lifecycles.

Supply support for IDT70824L20PF 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and power management solutions for communications, computing, and industrial markets.

The IDT70824L20PF belongs to IDT's SARAM™ family, designed specifically to eliminate bottlenecks in systems requiring concurrent high-speed streaming and random-access memory operations - especially in PCI, DSP, and real-time control applications.

FAQ

What is the maximum clock frequency supported by the sequential access port of the IDT70824L20PF?

The IDT70824L20PF sequential port supports a minimum clock cycle time of 25 ns, corresponding to a maximum operating frequency of 40 MHz. This is derived directly from the tRC (read cycle time) specification in the datasheet. The device achieves 20 ns tCD (clock-to-data delay), enabling reliable data capture at this rate under specified load conditions. The IDT70824L20PF does not specify a higher guaranteed frequency, and operation beyond 40 MHz violates the published AC timing limits.

Does the IDT70824L20PF support true simultaneous read/write operations across both ports?

Yes, the IDT70824L20PF supports true concurrent access: the random port can perform a read or write while the sequential port executes a read or write to the same memory array. Its dual-port RAM cell architecture eliminates bus contention, and the datasheet confirms independent enable controls (CE vs. SCE) and separate data buses (I/O0–I/O15 vs. SI/O0–SI/O15). No arbitration logic or external synchronization is required for this capability in the IDT70824L20PF.

How is buffer flow mode configured in the IDT70824L20PF, and what are the functional differences between BUFFER CHAINING and STOP modes?

Buffer flow mode is set via bits 1:0 (Buffer #1) and bits 3:2 (Buffer #2) of the Flow Control Register, accessed in CMD mode using A0–A2 = 100. In BUFFER CHAINING mode, reaching the end address of one buffer causes the pointer to jump to the start address of the other buffer and assert its EOB flag. In STOP mode, the pointer halts at EOB+1 (if CNTEN is LOW on next SCLK) and inhibits further sequential writes until released - a behavior enforced in hardware by the IDT70824L20PF's internal logic.

Can the IDT70824L20PF retain data when powered solely by a 2V backup supply, and what is the maximum current draw in that state?

Yes, the IDT70824L20PF guarantees data retention at VCC = 2.0 V, as specified in Table 9 (tCDR and VDR parameters). In this state, the maximum current draw is 4000 µA for military/industrial grades and 1500 µA for commercial grade - measured with CE = VHC and all inputs at valid logic levels. This retention capability is intrinsic to the IDT70824L20PF's design and requires no additional circuitry.

What are the pin compatibility and voltage requirements for replacing an IDT70824L25PF with the IDT70824L20PF?

The IDT70824L20PF and IDT70824L25PF share identical pinout, package (80-pin TQFP), and electrical interface (5V ±10%). The only difference is access speed: IDT70824L20PF guarantees 20 ns tAA/tCD, while IDT70824L25PF guarantees 25 ns. Therefore, IDT70824L20PF is a direct drop-in replacement for IDT70824L25PF in all applications, providing improved timing margin without layout or firmware changes.