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| E2D0037-27-41 Semiconductor * Semiconductor MSM6685 8,388,608-Word x 1-Bit Serial Register This version: Jan. 1998 MSM6685 Previous version: May. 1997 GENERAL DESCRIPTION The MSM6685 is a serial register composed of 8,388,608 words x one bit, characterized by mediumspeed, low power consumption operation. This device has a built-in internal address generation circuit allowing continuous serial read/write operation by external clock input. Read/write operation causes the internal address to be incremented automatically by +1. External address input enables addressing in units of 1024 words. Furthermore, a refresh timer and a refresh address counter are installed, which makes an external refresh circuit unnecessary. In addition, this configuration allows lower power consumption. The device is packaged in 26-pin SOJ having a width of 300 mil. It is well adapted for storing much data by means of a battery backup. Its combination with OKI's recording and playback IC enables the easy implementation of a solid recording and playback system. FEATURES * Configuration * Serial access operation Serial access time Serial read/write time * Low current drain : 8,388,608 1 bit : 1.5 ms : 2.5 ms : 200 mA max. (VCC = 4 V, at refresh operation, with data stored and under standard conditions) * Refresh operation A self-refresh function is supported. * Wide range of operating voltage : Single 3.5 to 5.5 V supply * Addressing : In units of 1024 words * Process : 0.5 mm double well CMOS process * Package: 26/20-pin plastic SOJ (SOJ26/20-P-300-1.27) (Product name : MSM6685JS) 1/9 Semiconductor MSM6685 BLOCK DIAGRAM Refresh Timer Row Decoder Address Multiplexer Refresh Address Counter 8,388,608 Data Register TAS Row Address Counter Column Decoder SAS I/O Control SAD Row Address Register Column Address Counter Timing Generator DIN DOUT RWSK Write Clock Generator WE 2/9 Semiconductor MSM6685 PIN CONFIGURATION (TOP VIEW) TEST 1 RWCK 2 NC 3 TEST 4 TEST 5 26 VCC 25 TEST 24 TEST 23 SAD 22 SAS TEST 9 TEST 10 DIN 11 NC 12 VSS 13 18 TAS 17 CS 16 WE 15 DOUT 14 NC NC : No connection 26/20-Pin Plastic SOJ PIN DESCRIPTION Pin 25 1, 4, 5 9, 10, 24 2 11 13 15 16 17 18 22 23 26 Symbol TEST TEST RWCK DIN VSS DOUT WE CS TAS SAS SAD VCC Test input Test input Read/write clock Data input Ground (0 V) Data output Write enable Chip select Transfer address strobe Serial address strobe Serial address data Power supply (5 V) Description Note : All TEST pins are to be connected to the power supply. The TEST pin is to be referenced to the ground level. 3/9 Semiconductor MSM6685 ABSOLUTE MAXIMUM RATINGS Parameter Pin Voltage Short-circuit Output Current Power Dissipation Operating Temperature Storage Temperature Symbol VT IOS PD Top TSTG Condition Against VSS at Ta = 25 C Ta = 25 C Ta = 25 C -- -- Rating -1.0 to +7.0 50 1 0 to 70 -55 to +150 Unit V mA W C C RECOMMENDED OPERATING CONDITIONS (Ta=0 to 70C) Parameter Supply Voltage Supply Voltage "H" Input Voltage "L" Input Voltage Symbol VCC VSS VIH VIL Min 3.5 0 VCC - 0.5 -0.2 Typ 4.5 0 VCC 0 Max 5.5 0 VCC + 0.2 +0.5 Unit V V V V ELECTRICAL CHARACTERISTICS DC Characteristics (VCC=3.5V to 5.5V, Ta=0 to 70C) Parameter "H" Output Voltage "L" Output Voltage Input Leakage Current Output Leakage Current Supply Current (Operation) Supply Current (Standby) Symbol VOH VOL IIL IOL ICC1 ICC2 Condition IOH=-0.5 mA IOL=0.5 mA VI=0 V to VCC VO=0 V to VCC VCC=4 V, tRWC=1 ms VCC=4 V Min VCC - 0.5 -- -1 -1 -- -- Max -- 0.4 +1 +1 20 200 Unit V V mA mA mA mA 4/9 Semiconductor AC Characteristics Parameter Read/Write Cycle Time Access Time Output Turn-off Delay Time I/O Signal Rise Time RWCK Pre-charge Time RWCK Pulse Time SAS Cycle Time SAS Pre-charge Time SAS Pulse Duration Address Setup Time Adress Hold Time TAS Setup Time TAS . RWCK Setup Time TAS Pulse Duration Read Instruction Setup Time Read Instruction Hold Time Write Instruction Setup Time Write Instruction Hold Time Write Instruction Pulse Duration WE. RWCK Read Time Data Setup Time Data Hold Time RWCK. WE Delay Time Symbol tRWC tACC tOFF tT tRWP tRW tSSC tSAP tSAS tAS tAH tATS tTRS tTAS tRRS tRRH tWRS tWRH tWP tRWL tDS tDH tRWD Min 2,500 -- 0 3 1,000 1,500 100 50 50 0 50 50 50 50 0 250 0 50 50 50 0 50 50 MSM6685 (VCC=3.5 V to 5.5 V, Ta=0 to 70C) Max -- 1,500 50 50 -- 10,000 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5/9 CS tRWC tTRS tRW tRWP Semiconductor TIMING DIAGRAM RWCK tSAS tSSC tSAP SAS tAS tAH Read/Write and Read/Modify/Write Cycles SAD tATS tTAS A0 A1 A12 TAS tRWL tRRS tRRH tRWD tWP tWRS tWRH WE tDS tDH tDS tDH DIN tACC tOFF n+1 n+2 MSM6685 DOUT n n+1 6/9 Semiconductor MSM6685 PIN FUNCTIONS AND OPERATING MODES * Serial address input (SAD) Pin used to enter start address for reading/writing. An address can be specified in units of 1024 words. 1024 words of address data can be entered through the pin as 13 bits (A0 to A12) of serial data. * Serial address strobe (SAS) This is a clock pin for latching serial address data into an internal register. * Address transfer strobe (TAS) This is an input pin for loading the internal address counter with serial address data latched in the address register. * Read/write clock (RWCK) This is a clock input pin for reading and writing information in the data register. The trailing edge of RWCK triggers off internal operation. In the reading mode, information in the data register is output to the DOUT pin. In the writing mode, the data register is loaded with DIN information. A the leading edge of RWCK, the internal address counter is incremented automatically by +1. * Write enable (WE) This is an input pin for selecting the read mode, the write mode, or the read-modify-write mode. When WE is "H", the read mode is set up and, when WE is "L", the write mode is set up. When the level is lowered from "H" to "L" with RWCK active, the read-modify-write mode is set up. * Data input (DIN) This is a pin for entering write data. Information on the data input pin is latched when the trailing edge of RWCK is encountered in the write mode and that of WE is encountered in the read-modify mode. * Data output (DOUT) The data output pin always provides high impedance as long as RWCK or CS is kept at "H". When "H" or "L" information is read, the output pin set at "H" or "L", and information read is held until RWCK returns to "H" . In the early write mode, the output pin is maintained at high impedance, so that, connection of DIN and DOUT enables "I/O common operation". * Chip select (CS) This is an input pin for disabling all input pins. This pin allows the use of two or more MSM6684A devices with data input and output pins connected in parallel. * Test (TEST, TEST) The TEST pin must always be fixed at "L" and the TEST pin at "H". 7/9 Semiconductor MSM6685 NOTES ON ENERGIZATION MSM6685 has built-in bias generator and internal power supply circuits, thus, power up must be followed by a pause of 1 ms or more for internal circuit stabilization. Furthermore, the TEST pin must be brought "L" concurrently with or prior to VCC, and all clock input pins and TEST pins must be brought "H" concurrently with or prior to VCC. To achieve proper operation of internal circuits, the initial pause above must be followed by a minimum ten dummy read cycles with RWCK for internal circuit initialization. NOTES ON SUPPLY VOLTAGE VARIATION When using MSM6685, take precautions so that the supply voltage does not vary over one volt within a period of 1,000ms or less in the active state. 8/9 Semiconductor MSM6685 PACKAGE DIMENSIONS (Unit : mm) SOJ26/20-P-300-1.27 Mirror finish Package material Lead frame material Pin treatment Solder plate thickness Package weight (g) Epoxy resin 42 alloy Solder plating 5 mm or more 0.80 TYP. Notes for Mounting the Surface Mount Type Package The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). 9/9 |
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