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DP8428 Datasheet (DP8428 / DP8429) 1 Megabit High Speed Dynamic RAM Controller/Drivers

Manufacturer: National Semiconductor (now Texas Instruments)

Download the DP8428 datasheet PDF. This datasheet also includes the DP8429 variant, as both parts are published together in a single manufacturer document.

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Note: The manufacturer provides a single datasheet file (DP8429_NationalSemiconductor.pdf) that lists specifications for multiple related part numbers.

General Description

The DP8428 and DP8429 1M DRAM Controller Drivers are designed to provide ‘‘No-Waitstate’’ CPU interface to Dynamic RAM arrays of up to 8 Mbytes and larger The DP8428 and DP8429 are tailored for 32-bit and 16-bit system requirements respectively Both devices are fabricated using National’s new oxide isolated Advanced Low power Schottky (ALS) process and use design techniques which enable them to significantly out-perform all other LSI or discrete alternatives in speed level of integration and power consumption Each device integrates the following critical 1M DRAM controller functions on a single monolithic device ultra precise delay line 9 bit refresh counter fall-through row column and bank select input latches Row Column address muxing logic on-board high capacitive-load RAS CAS Write Enable and Address output drivers and precise control signal timing for all the above In order to specify each device for ‘‘true’’ worst case operating conditions all timing parameters are guaranteed while the chip is driving the capacitive load of 88 DRAMs including trace capacitance The chip’s delay timing logic makes use of a patented new delay line technique which keeps AC skew to g 3 ns over the full VCC range of g 10% and temperature range of b55 C to a 125 C The DP8428 and DP8429 guarantee a maximum RASIN to CASOUT delay of 80 ns or 70 ns even while driving an 8 Mbyte memory array with error correction check bits included Two speed selected options of these devices are shown in the switching characteristics section of this document (Continued)

Overview

DP8428 NS32828 DP8429 NS32829 1 Megabit High Speed Dynamic RAM Controller Drivers September 1991 DP8428 NS32828 DP8429 NS32829 1 Megabit High Speed Dynamic RAM Controller.

Key Features

  • Y Y Y Y Y Y Y Y Makes DRAM interface and refresh tasks appear virtually transparent to the CPU making DRAMs as easy to use as static RAMs Specifically designed to eliminate CPU wait states up to 10 MHz or beyond Eliminates 20 discrete components for significant board real estate reduction system power savings and the elimination of chip-to-chip AC skewing On-board ultra precise delay line On-board high capacitive RAS CAS WE and Address drivers (specified driving 88 DRAMs directly) AC specif.

More Datasheets from National Semiconductor (now Texas Instruments)

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DP84240 (DP84240 / DP84244) TRI-STATE Drivers Which are Designed For Heavy Capacitive Load Applications
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DP8429 (DP8428 / DP8429) 1 Megabit High Speed Dynamic RAM Controller/Drivers
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