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LM12458CIV Datenblatt(PDF) 8 Page - National Semiconductor (TI) |
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LM12458CIV Datenblatt(HTML) 8 Page - National Semiconductor (TI) |
8 / 43 page Internal Reference Characteristics (Notes 6, 7, 19) (Continued) The following specifications apply to the LM12454, LM12458, and LM12H458 for V A+ = VD+ = 5V unless otherwise specified. Boldface limits apply for T A = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. Symbol Parameter Conditions Typical Limits Unit (Note 10) (Note 11) (Limit) t SU Internal Reference Start-Up Time V A+ = VD+ = 0V → 5V 10 ms C L = 100 µF Digital Characteristics (Notes 6, 7, 8, 19) The following specifications apply to the LM12454, LM12458, and LM12H458 for V A+ = VD+ = 5V, unless otherwise speci- fied. Boldface limits apply for T A = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. Symbol Parameter Conditions Typical Limits Unit (Note 10) (Note 11) (Limit) V IN(1) Logical “1” Input Voltage V A+ = VD+ = 5.5V 2.0 V (min) V IN(0) Logical “0” Input Voltage V A+ = VD+ = 4.5V 0.8 V (max) I IN(1) Logical “1” Input Current V IN = 5V 0.005 1.0 µA (max) LM12(H)458MEL 2.0 I IN(0) Logical “0” Input Current V IN = 0V −0.005 −1.0 µA (max) LM12(H)458MEL −2.0 C IN D0–D15 Input Capacitance 6 pF V OUT(1) Logical “1” Output Voltage V A+ = VD+ = 4.5V I OUT = −360 µA 2.4 V (min) I OUT = −10 µA 4.25 V (min) V OUT(0) Logical “0” Output Voltage V A+ = VD+ = 4.5V 0.4 V (max) I OUT = 1.6 mA I OUT TRI-STATE® Output Leakage Current V OUT = 0V −0.01 −3.0 µA (max) V OUT = 5V 0.01 3.0 µA (max) Digital Timing Characteristics (Notes 6, 7, 8, 19) The following specifications apply to the LM12454, LM12458, and LM12H458 for V A+ = VD+ = 5V, tr = tf = 3 ns, and CL = 100 pF on data I/O, INT and DMARQ lines unless otherwise specified. Boldface limits apply for T A = TJ = TMIN to TMAX; all other limits T A = TJ = 25˚C. Symbol Parameter Conditions Typical Limits Unit (See Figures 8, 9, 10) (Note 10) (Note 11) (Limit) 1, 3 CS or Address Valid to ALE Low 40 ns (min) Set-Up Time 2, 4 CS or Address Valid to ALE Low 20 ns (min) Hold Time 5 ALE Pulse Width 45 ns (min) 6 RD High to Next ALE High 35 ns (min) 7 ALE Low to RD Low 20 ns (min) 8 RD Pulse Width 100 ns (min) 9 RD High to Next RD or WR Low 100 ns (min) 10 ALE Low to WR Low 20 ns (min) 11 WR Pulse Width 60 ns (min) 12 WR High to Next ALE High 75 ns (min) 13 WR High to Next RD or WR Low 140 ns (min) 14 Data Valid to WR High Set-Up Time 40 ns (min) 15 Data Valid to WR High Hold Time 30 ns (min) 16 RD Low to Data Bus Out of TRI-STATE 40 10 ns (min) 70 ns (max) www.national.com 8 |
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