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SN74ALS2238FNR 数据表(PDF) 6 Page - Texas Instruments |
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SN74ALS2238FNR 数据表(HTML) 6 Page - Texas Instruments |
6 / 11 page SN74ALS2238 32 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST IN, FIRST OUT MEMORY SDAS182 − APRIL 1990 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 SELECT-MODE CONTROL TABLE CONTROL OPERATION SAB SBA A BUS B BUS L L Real-time B to A bus Real-time A to B bus L H FIFO B to A bus Real-time A to B bus H L Real-time B to A bus FIFO A to B bus H H FIFO B to A bus FIFO A to B bus OUTPUT-ENABLE CONTROL TABLE CONTROL OPERATION GAB GBA A BUS B BUS H H A bus enabled B bus enabled L H A bus enabled Isolation/ input to B bus H L Isolation / input to A bus B bus enabled L L Isolation / input to A bus Isolation/ input to B bus programming procedure for depth of FIFO A† Program: Step 1. With RSTA at a high level, take DAF from a high level to a low level. The high-to-low transition on DAF stores the binary value of A0 −A4 for use as the value of X in defining the depth of FIFO A. Step 2. With DAF held low, pulse the RSTA signal low. On the low-to-high transition of RSTA, FIFO A is set to a depth of 32 − X, where X is the value of A0 −A4 stored above. Step 3. To redefine the depth of FIFO A to 32 words, hold DAF at a high level and pulse the RSTA signal low. † The programming procedures used to define the depth of FIFO B are the same as the procedure above. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC −0.5 V to 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage: Control inputs 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O ports 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage applied to a disabled 3-state output 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range, TA 0 °C to 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range −65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum junction temperature 150 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. |
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