MSM6691 Schematic ( PDF Datasheet ) - OKI electronic componets

Teilenummer	MSM6691
Beschreibung	DRAM Interface IC
Hersteller	OKI electronic componets
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Gesamt 7 Seiten ¡¡ SemicondSucetormiconductor MSM6691 DRAM Interface IC MSM6691 GENERAL DESCRIPTION DRAMs can be used for voice storage by connecting the MSM6691 with OKI's integrate R/W (Read/Write) ICs, the MSM6388, and the MSM6588. The MSM6691 translates the signals associated with the dedicated serial register interface of the MSM6388 and MSM6588 driver interface when used in a stand-alone mode. FEATURES • DRAM (¥ 1-bit configuration) • 1-Mbit DRAM (M 51100A, M511001A) : Four units can be used. • 4-Mbit DRAM (M 514100A, M514101A) : Four units can be used. • Power voltage : 5V single • Built-in refresh circuit (RAS only refresh) • Oscillation frequency : 8MHz (during refresh) • Sampling frequency • 4 kHz to 32 kHz when MSM6388 is connected. • 4 kHz to 16 kHz when MSM6588 is connected. • Package : 44-pin plastic QFP (QFP44-P-910-2K) (Product name : MSM6691GS-2K) MSM6691 ¡ Semiconductor APPLICATION CIRCUITS Figure 2 indicates an example of the circuits used when the MSM6388 (M6588) is used with four 1-Mbit DRAMs. Figure 3 indicates an example of the circuits used when MSM6388 (M6588) is used with four 4- Mbit DRAMs. MSM511000A MSM511000A MSM511000A MSM511000A MSM6691 MSM6388 or MSM6588 Figure 2. Example of Interfacing with Four 1-Mbit DRAMs 6 Page
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