Semiconductor MSM6685 8,388,608-Word 1-Bit Serial Register T

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Semiconductor MSM6685 8,388,608-Word 1-Bit Serial Register T

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E2D0037-27-41 Semiconductor
Semiconductor MSM6685
8,388,608-Word 1-Bit Serial Register
This version: Jan. 1998 MSM6685 Previous version: May. 1997
GENERAL DESCRIPTION
MSM6685 serial register composed 8,388,608 words bit, characterized mediumspeed, power consumption operation. This device built-in internal address generation circuit allowing continuous serial read/write operation external clock input. Read/write operation causes internal address incremented automatically External address input enables addressing units 1024 words. Furthermore, refresh timer refresh address counter installed, which makes external refresh circuit unnecessary. addition, this configuration allows lower power consumption. device packaged 26-pin having width mil. well adapted storing much data means battery backup. combination with OKI's recording playback enables easy implementation solid recording playback system.
FEATURES
Configuration Serial access operation Serial access time Serial read/write time current drain 8,388,608 max. (VCC refresh operation, with data stored under standard conditions)
Refresh operation self-refresh function supported. Wide range operating voltage Single supply Addressing units 1024 words Process double well CMOS process Package: 26/20-pin plastic (SOJ26/20-P-300-1.27) (Product name MSM6685JS)
Semiconductor
MSM6685
BLOCK DIAGRAM
Refresh Timer
Decoder
Address Multiplexer
Refresh Address Counter
8,388,608 Data Register
Address Counter
Column Decoder Control Address Register Column Address Counter Timing Generator
DOUT
RWSK
Write Clock Generator
Semiconductor
MSM6685
CONFIGURATION (TOP VIEW)
TEST RWCK TEST TEST
TEST TEST
TEST TEST
DOUT
connection 26/20-Pin Plastic
DESCRIPTION
Symbol TEST TEST RWCK DOUT Test input Test input Read/write clock Data input Ground Data output Write enable Chip select Transfer address strobe Serial address strobe Serial address data Power supply Description
Note TEST pins connected power supply. TEST referenced ground level.
Semiconductor
MSM6685
ABSOLUTE MAXIMUM RATINGS
Parameter Voltage Short-circuit Output Current Power Dissipation Operating Temperature Storage Temperature Symbol TSTG Condition Against Rating -1.0 +7.0 +150 Unit
RECOMMENDED OPERATING CONDITIONS
(Ta=0 70°C) Parameter Supply Voltage Supply Voltage Input Voltage Input Voltage Symbol -0.2 +0.5 Unit
ELECTRICAL CHARACTERISTICS
Characteristics
(VCC=3.5V 5.5V, Ta=0 70°C) Parameter Output Voltage Output Voltage Input Leakage Current Output Leakage Current Supply Current (Operation) Supply Current (Standby) Symbol ICC1 ICC2 Condition IOH=-0.5 IOL=0.5 VI=0 VO=0 VCC=4 tRWC=1 VCC=4 Unit
Semiconductor Characteristics
Parameter Read/Write Cycle Time Access Time Output Turn-off Delay Time Signal Rise Time RWCK Pre-charge Time RWCK Pulse Time Cycle Time Pre-charge Time Pulse Duration Address Setup Time Adress Hold Time Setup Time RWCK Setup Time Pulse Duration Read Instruction Setup Time Read Instruction Hold Time Write Instruction Setup Time Write Instruction Hold Time Write Instruction Pulse Duration RWCK Read Time Data Setup Time Data Hold Time RWCK. Delay Time Symbol tRWC tACC tOFF tRWP tSSC tSAP tSAS tATS tTRS tTAS tRRS tRRH tWRS tWRH tRWL tRWD 2,500 1,000 1,500
MSM6685
(VCC=3.5 Ta=0 70°C) 1,500 10,000 Unit
tRWC tTRS tRWP
Semiconductor
TIMING DIAGRAM
RWCK
tSAS
tSSC tSAP
Read/Write Read/Modify/Write Cycles
tATS tTAS
tRWL tRRS tRRH tRWD
tWRS
tWRH
tACC tOFF
MSM6685
DOUT
Semiconductor
MSM6685
FUNCTIONS OPERATING MODES
Serial address input (SAD) used enter start address reading/writing. address specified units 1024 words. 1024 words address data entered through bits A12) serial data. Serial address strobe (SAS) This clock latching serial address data into internal register. Address transfer strobe (TAS) This input loading internal address counter with serial address data latched address register. Read/write clock (RWCK) This clock input reading writing information data register. trailing edge RWCK triggers internal operation. reading mode, information data register output DOUT pin. writing mode, data register loaded with information. leading edge RWCK, internal address counter incremented automatically Write enable (WE) This input selecting read mode, write mode, read-modify-write mode. When "H", read mode and, when "L", write mode When level lowered from with RWCK active, read-modify-write mode Data input (DIN) This entering write data. Information data input latched when trailing edge RWCK encountered write mode that encountered read-modify mode. Data output (DOUT) data output always provides high impedance long RWCK kept "H". When information read, output "L", information read held until RWCK returns early write mode, output maintained high impedance, that, connection DOUT enables "I/O common operation". Chip select (CS) This input disabling input pins. This allows more MSM6684A devices with data input output pins connected parallel. Test (TEST, TEST) TEST must always fixed TEST "H".
Semiconductor
MSM6685
NOTES ENERGIZATION
MSM6685 built-in bias generator internal power supply circuits, thus, power must followed pause more internal circuit stabilization. Furthermore, TEST must brought concurrently with prior VCC, clock input pins TEST pins must brought concurrently with prior VCC. achieve proper operation internal circuits, initial pause above must followed minimum dummy read cycles with RWCK internal circuit initialization.
NOTES SUPPLY VOLTAGE VARIATION
When using MSM6685, take precautions that supply voltage does vary over volt within period 1,000ms less active state.
Semiconductor
MSM6685
PACKAGE DIMENSIONS
(Unit
SOJ26/20-P-300-1.27
Mirror finish
Package material Lead frame material treatment Solder plate thickness Package weight
Epoxy resin alloy Solder plating more 0.80 TYP.
Notes Mounting Surface Mount Type Package SOP, QFP, TSOP, SOJ, (PLCC), surface mount type packages, which very susceptible heat reflow mounting humidity absorbed storage. Therefore, before perform reflow mounting, contact Oki's responsible sales person product name, package name, number, package code desired mounting conditions (reflow method, temperature times).

Semiconductor MSM6685 8,388,608-Word 1-Bit Serial Register T

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