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HD66421TB0 Datasheet(PDF) 46 Page - Hitachi Semiconductor |
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HD66421TB0 Datasheet(HTML) 46 Page - Hitachi Semiconductor |
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46 / 46 page  Preliminary Rev. 1.1E '99.02.10 HD66421 AC Characteristics (Vcc = 2.2 to 5.5V, GND = 0V, Ta = -40 to +85°C Note 1) Clock Characteristics Item Symbol Min Typ Max Unit Notes Oscillation frequency fOSC 160 220 280 kHz Rf = 180k Ω, Vcc = 3.0V External clock frequency fCP 50 400 kHz External clock duty cycle Duty 45 50 55 % External clock fall time tr – – 0.2 µs External clock rise time tf – – 0.2 µs MPU Interface Item Symbol Min Typ Max Unit Notes RD low-level width tWRDL 250 – ns RD high-level width tWRDH 450 – – ns WR low-level width tWWRL 190 – ns WR high-level width tWWRH 450 – – ns Address setup time tAS 20 – – ns Address hold time tAH 20 – – ns Data delay time tDDR – – 180 ns Data output hold time tDHR 20 – – ns Data setup time tDSW 150 – – ns Data hold time tDHW 10 – – ns Reset Timing Item Symbol Min Typ Max Unit Notes RES low-level width tRES 1 – – ms 46 – 190 – ns 250 – ns – 150 ns 100 – ns – – Vcc = 2.2V to 3.0V, 2 Vcc = 3.0V to 5.5V, 2 Vcc = 2.2V to 3.0V, 2 Vcc = 3.0V to 5.5V, 2 Vcc = 2.2V to 3.0V Vcc = 3.0V to 5.5V Vcc = 2.2V to 3.0V Vcc = 3.0V to 5.5V Figure 44 MPU Interface Notes. The following load circuit is connected for specification. VOH and VOL of the timing specification is 1/2 VCC level. Output terminal 30pF(includes board capacitance) tWRDL tWRDH tWWRL tWWRH tAS tAH tDDR tDHR tDSW tDHW tAS tAH RD WR RS,CS DB7- DB0 4tOSC - 450 4tOSC - 450 4tOSC - 450 4tOSC - 450 Note 1 All electrical characteristic are guaranteed at +85°C for die products. Note 2 tOSC = 1 / fOSC |
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