Lot of Vtg (1982) Multi-DRAM (48-Pin) Controller/Drivers (9), NSC (#DP8409N-3) For Sale

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Lot of Vintage (1982) \"Multi-Mode Dynamic RAM\" (48-Pin/256k) Controller/Drivers (9), by National Semiconductor Corporation (#DP8409N-3)

• Packaging Condition: GOOD/GREAT - Comes in original anti-static tube packaging, but NO literature - data sheets can be found online (UNTESTED, and never used) and shipped in sturdy 25\" mailing tube (SEALED w/pins on each end); w/minor scuffs and may have yellowing stains to tube packaging (due to storage); chips unaffected - see pics
• Made in 1982
• Selling together as lot of 9 count in 1 tube
• Dynamic memory system designs, which formerly required several support chips to drive the memory array, can now be implemented with a single IC... the DP8409: Multi-Mode Dynamic RAM Controller/Driver. The DP8409 is capable of driving all 16k and 64k Dynamic RAMS (DRAMs) as well as 256k DRAMs. Since the DP8409 is a one-chip solution (including capacitive-load drivers), it minimizes propagation delay skews, the major performance disadvantage of multiple-chip memory drive and control. The DP8409\'s 8 modes of operation offer a wide selection of DRAM control capabilities. Memory access may be controlled externally or on-chip automatically; an on-chip refresh counter makes refreshing (either externally or automatically controlled) less complicated; and automatic memory initialization is both simple and fast. The DP8409 is a 48-pin DRAM Controller/Driver with 9 multiplexed address outputs and 6 control signals. It consists of two 9-bit address latches, a 9-bit refresh counter, and control logic. All output drivers are capable of driving 500 pF loads with propagation delays of 25ns. The DP8409 timing parameters are specified driving the typical load capacitance of 88 DRAMs, including trace capacitance. The DP8409 has 3 mode-control pins: M2, M1, and MO, where M2 is in general REFRESH. These 3 pins select 8 modes of operation. Inputs B1 and BO in the memory access modes (M2= 1), are select inputs which select one of four RAS outputs. During normal access, the 9 address outputs can be selected from the Row Address Latch or the Column Address Latch. During refresh, the 9-bit on-chip refresh counter is enabled onto the address bus and in this mode all RAS outputs are selected, while CAS is inhibited. The DP8409 can drive up to 4 banks of DRAMs, with each bank comprised of 16k\'s, 64k\'s, or 256k\'s. Control signal outputs RAS, CAS, and WE are provided with the same drive capability. Each RAS output drives one bank of DRAMs so that the four RAS outputs are used to select the banks, while CAS, WE, and the multiplexed addresses can be connected to all of the banks of DRAMs. This leaves the non-selected banks in the standby mode (less than one tenth of the operating power) with the data outputs in TRI-STATE. Only the bank with its associated RAS low will be written to or read from.
• \"National Semiconductor Corporation\" was an American semiconductor manufacturer founded in Danbury, Connecticut, by Dr. Bernard J. Rothlein on May 27, 1959, which specialized in analog devices and subsystems, formerly headquartered in Santa Clara, California. The company produced power management integrated circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. National\'s key markets included wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial and test and measurement applications. On September 23, 2011, the company formally became part of Texas Instruments as the \"Silicon Valley\" division.
• Your shipment will arrive via USPS Priority Mail (1-4 business days) or USPS Ground Advantage (2-5 business days), after the 2-3 day processing time (upon paid purchase)
• WE COMBINE-SHIP -ASK US FIRST!
• Shipment(s) sent out of Lemon Grove, California, USA
• Will be packed very well - read our response!
• No Returns

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