YMF278B

The YMF278B (OPL4) is an advanced synthesizer LSI which intergrates Wave Table synthesis and FM synthesis into one chip.It can generate 24 voices of Wave Table synthesis at a time.With wave data memory connected externally,it complies with GM System Level 1.The FM synthesis portion is register-compatible with the YMF262 (OPL3) which is a popular synthesizer LSI for IBM-PC.With these features, this LSI (YMF278B) maintains software compatibility with applications currently in use and provides enhanced functions and higher performance when it is used in a multi-media personal computor or sound board.

What comes next is about the absolute maximum ratings (Ta=+25) of YMF278B.The VDD (power supply voltage) is from -0.3 V to +7.0 V.The VI (input voltage) is from -0.3 V to VDD+0.5 V.The Top (operating temperature) is from 0 to +70.The Tstg (storage temperature) is from -50 to +125.Then is about the recommended operating conditions.The minimum VDD (power supply voltage) is 4.75 V,the typicall is 5.00 V and the maximum is 5.25 V.The minimum Top (operating temperature) is 0,the typical is 25 and the maximum is 70.

The following is about the DC characteristics (Conditions: Ta=0 to 70,VDD=5.0±0.25 V) of YMF278B.The maximum PD (power dissipation) is 250 mW at VDD=5.0 V, fM=33.8688 MHz.The minimum VIH1 (high level input voltage) is 2.0 V and the maximum VIL1 (low level input voltage) is 0.8 V applied to /WR, /RD, /CS, A0-A2, MD0-MD7.The minimum VIH2 (high level input voltage) is 3.5 V and the maximum VIL2 (low level input voltage) is 1.0 V applied to /TST1, /TST2, XI.The minimum VOH1 (high level output voltage) is VDD-1.0 V at IOH=-80 A and the maximum VOL1 (low level output voltage) is VSS+0.4 V at IOL=2.0 mA applied to D0-D7, CLKO, BCO, LRO, WCO, DO0-DO2, /MWR, /MRD, MD0-MD7 (when used as output pin).The minimum VOH2 (high level output voltage) is VDD-1.0 V at IOH=-160 A and the maximum VOL2 (low level output voltage) is VSS+0.4 V at IOL=4.0 mA applied to MA0-MA5, /MCS0-/MSS13.