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SN74ACT2235-40PAG 데이터시트(PDF) 9 Page - Texas Instruments |
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SN74ACT2235-40PAG 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 18 page SN74ACT2235 1024 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY SCAS148F – DECEMBER 1990 – REVISED JUNE 2003 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP† MAX UNIT VOH VCC = 4.5 V, IOH = –8 mA 2.4 V VOL Flags VCC = 4.5 V, IOL = 8 mA 0.5 V VOL I/O ports VCC = 4.5 V, IOL = 16 mA 0.5 V II VCC = 5.5 V, VI = VCC or 0 ±5 µA IOZ VCC = 5.5 V, VO = VCC or 0 ±5 µA ICC‡ VI = VCC – 0.2 V or 0 10 400 µA ∆ICC§ VCC = 5.5 V, One input at 3.4 V, Other inputs at VCC or GND 1 mA Ci VI = 0, f = 1 MHz 4 pF Co VO = 0, f = 1 MHz 8 pF † All typical values are at VCC = 5 V, TA = 25°C. ‡ ICC is tested with outputs open. § This is the supply current when each input is at one of the specified TTL voltage levels, rather than 0 V or VCC. timing requirements over recommended operating conditions (unless otherwise noted) (see Figure 3) ’ACT2235-20 ’ACT2235-30 ’ACT2235-40 ’ACT2235-60 UNIT MIN MAX MIN MAX MIN MAX MIN MAX UNIT f lk Clock frequency LDCKA or LDCKB 50 33 25 16.7 MHz fclock Clock frequency UNCKA or UNCKB 50 33 25 16.7 MHz RSTA or RSTB low 20 20 25 25 LDCKA or LDCKB low 8 10 14 20 t Pulse duration LDCKA or LDCKB high 8 10 14 20 ns tw Pulse duration UNCKA or UNCKB low 8 10 14 20 ns UNCKA or UNCKB high 8 10 14 20 DAF or DBF high 10 10 10 10 Data before LDCKA or LDCKB ↑ 4 4 5 5 Define AF/AE: D0–D8 before DAF or DBF ↓ 5 5 5 5 tsu Setup time Define AF/AE: DAF or DBF ↓ before RSTA or RSTB ↑ 7 7 7 7 ns Define AF/AE (default): DAF or DBF high before RSTA or RSTB ↑ 5 5 5 5 RSTA or RSTB inactive (high) before LDCKA or LDCKB ↑ 5 5 5 5 Data after LDCKA or LDCKB ↑ 1 1 2 2 Define AF/AE: D0–D8 after DAF or DBF ↓ 0 0 0 0 th Hold time Define AF/AE: DAF or DBF low after RSTA or RSTB ↑ 0 0 0 0 ns Define AF/AE (default): DAF or DBF high after RSTA or RSTB ↑ 0 0 0 0 |
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