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M4T28-BR12SH Datenblatt(PDF) 8 Page - STMicroelectronics |
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M4T28-BR12SH Datenblatt(HTML) 8 Page - STMicroelectronics |
8 / 29 page M48T37Y, M48T37V 8/29 READ Mode The M48T37Y/V is in the READ Mode whenever WRITE Enable (W) is high and Chip Enable (E) is low. The unique address specified by the 15 Ad- dress Inputs defines which one of the 32,752 bytes of data is to be accessed. Valid data will be avail- able at the Data I/O pins within Address Access time (tAVQV) after the last address input signal is stable, providing that the E and Output Enable (G) access times are also satisfied. If the E and G ac- cess times are not met, valid data will be available after the latter of the Chip Enable Access time (tELQV) or Output Enable Access time (tGLQV). The state of the eight three-state Data I/O signals is controlled by E and G. If the outputs are activat- ed before tAVQV, the data lines will be driven to an indeterminate state until tAVQV. If the Address Inputs are changed while E and G remain active, output data will remain valid for Out- put Data Hold time (tAXQX) but will be indetermi- nate until the next Address Access. Figure 5. READ Mode AC Waveforms Note: WRITE Enable (W) = High. Table 3. READ Mode AC Characteristics Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C or –40 to 85°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted). 2. CL = 5pF. Symbol Parameter(1) M48T37Y M48T37V Unit –70 –100 Min Max Min Max tAVAV READ Cycle Time 70 100 ns tAVQV Address Valid to Output Valid 70 100 ns tELQV Chip Enable Low to Output Valid 70 100 ns tGLQV Output Enable Low to Output Valid 35 50 ns tELQX (2) Chip Enable Low to Output Transition 5 10 ns tGLQX (2) Output Enable Low to Output Transition 5 5 ns tEHQZ (2) Chip Enable High to Output Hi-Z 25 50 ns tGHQZ (2) Output Enable High to Output Hi-Z 25 40 ns tAXQX Address Transition to Output Transition 10 10 ns AI00925 tAVAV tAVQV tAXQX tELQV tELQX tEHQZ tGLQV tGLQX tGHQZ VALID A0-A14 E G DQ0-DQ7 VALID |
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