MSM6691

¡ Semiconductor MSM6691 ¡ Semiconductor 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 BLOCK DIAGRAM TEST TEST GND VDD SAD Sin P OUT 10 Row Address Counter LD 10 Column or Row Address Multiplexer A10 11 Address Multiplexer 11 A0 to A10 CK SAS TAS 10 11 XT OSC XT R Column Address Counter Refresh Counter WE RWCK 4M/1M to CS4 4 Timing and Control XWE DRAM CAS Control CONTROL 4 RAS CAS1 to CAS4 BANK0 D0 D1 LE Q0 Q1 BANK1 BKLE D OUT XDIN ¡ Semiconductor MSM6691 PIN CONFIGURATION (TOP VIEW) RWCK DOUT CS3 CS4 A10 VDD WE A9 A8 A7 35 A6 34 33 32 31 30 29 28 27 26 25 24 23 44 43 42 41 40 39 38 37 CS2 CS1 SAD SAS TAS GND TEST BKLE 4M/1M BANK0 BANK1 1 2 3 4 5 6 7 8...