INTEGRATED CIRCUITS 74F764-1/74F765-1 DRAM dual-ported controllers Product specification IC15 Data Handbook 1992 Aug 10 Philips Semiconductors Product specification DRAM dual-ported controllers 74F764-1/74F765-1 FEATURES DESCRIPTION • Allows two microprocessors to access the same bank of dynamic The 74F764-1/765-1 DRAM Dual-ported Controller is a high-speed synchronous dual-port arbiter and timing generator that allows two microprocessors, microcontrollers, or any other memory accessing device to share the same block of DRAM. The device performs arbitration, signal timing, address multiplexing, and refresh address generation, replacing up to 25 discrete devices. RAM • Performs arbitration, signal timing, address multiplexing and refresh • 9 Address output pins allow direct control of up to 256K dynamic RAMs 74F764-1 vs. 74F765-1 • External address multiplexing enables control of 1Mbit (or greater) The 74F764-1, though functionally and pin-to-pin compatible with the 74F765-1, differs from the later in that it has an on-chip address input latch. This is useful in systems that have unlatched or multiplexed address and data bus. dynamic RAMs • Separate refresh clock allows adjustable refresh timing • 74F764-1 has an on-chip 18-bit address input latch • 74F764-1/765-1 allow control of dynamic RAMs with row access The specialized outputs eliminate the need for signal terminations in essentially all applications. times down to 40ns Both devices are available in 40-pin plastic DIP or 44-pin PLCC with pinouts designed to allow convenient placement of microprocessors, DRAMs, and other support chips. • 74F764-1/765-1 output drivers designed for first reflected wave switching ORDERING INFORMATION COMMERCIAL RANGE VCC = 5V±10%, Tamb = 0°C to 70°C DRAWING NUMBER 40-Pin Plastic Dual In-line Package 74F764-1N, 74F765-1N SOT129–1 44-Pin Plastic Leaded Chip Carrier 74F764-1A, 74F765-1A SOT187–2 DESCRIPTION PIN CONFIGURATIONS N Package A1 1 40 RCP A10 2 39 WG A2 3 38 GNT A11 4 37 CASEN A3 5 36 DTACK A12 A4 A13 A5 6 7 8 9 A Package CASEN A12 A3 A11 A2 A10 A1 RCP WG GNT DTACK 6 4 3 2 1 44 43 42 41 40 35 RAS 39 RAS 34 MA0 A13 8 38 MA0 A5 9 37 MA1 A14 10 36 MA2 33 MA1 32 MA2 VCC 11 35 GND A6 12 34 GND A14 10 31 GND 11 30 MA3 A15 13 33 MA3 A6 12 29 MA4 A7 14 32 MA4 A16 15 31 MA5 A8 16 30 MA6 VCC A15 13 28 MA5 A7 14 27 MA6 A16 15 26 MA7 A8 16 25 MA8 A17 17 18 19 20 21 22 23 24 25 26 27 28 REQ2 CP NC MA8 A9 A18 NC NC SEL1 REQ1 SEL2 24 CP A9 18 23 SEL2 A18 19 22 REQ2 SEL1 20 21 REQ1 29 MA7 A17 17 SF00703 1992 Aug 10 5 A4 7 SF00685 2 853-0878 07412 Philips Semiconductors Product specification DRAM dual-ported controllers 74F764-1/74F765-1 DIP40: plastic dual in-line package; 40 leads (600 mil) 1992 Aug 10 21 SOT129-1