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SN74ALS2238 Datenblatt(PDF) 9 Page - Texas Instruments |
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SN74ALS2238 Datenblatt(HTML) 9 Page - Texas Instruments |
9 / 11 page SN74ALS2238 32 × 9 × 2 ASYNCHRONOUS BIDIRECTIONAL FIRST IN, FIRST OUT MEMORY SDAS182 − APRIL 1990 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 switching characteristics over recommended ranges of supply voltage and operating free-air temperature (see Figure 2) PARAMETER FROM (INPUT) TO (OUTPUT) CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω UNIT (INPUT) (OUTPUT) MIN TYP† MAX fmax LDCK, UNCK 40 MHz tpd LDCKA ↑, LDCKB↑ B, A 7 22 33 ns tpd UNCKA ↑, UNCKB↑ B, A 7 20 29 ns tPLH LDCKA ↑, LDCKB↑ EMPTYA, EMPTYB 5 12 22 ns tPHL UNCKA ↑, UNCKB↑ EMPTYA, EMPTYB 5 12 22 ns tPHL RSTA ↓, RSTB↓ EMPTYA, EMPTYB 5 12 22 ns tPHL LDCKA ↑, LDCKB↑ FULLA, FULLB 5 12 22 ns tPLH UNCKA ↑, UNCKB↑ FULLA, FULLB 5 12 23 ns tPLH RSTA ↓, RSTB↓ FULLA, FULLB 6 15 28 ns tpd SAB, SBA‡ B, A 2 11 18 ns tpd A/B B, A 2 8 15 ns ten GBA, GAB A, B 2 6 15 ns tdis GBA, GAB A, B 1 5 12 ns † All typical values are at VCC = 5 V, TA = 25°C. ‡ These parameters are measured with the internal output state of the storage register opposite to that of the bus input. |
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