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1 SN74LS191N SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL 524K TI 4145561
2 SN74LS191N PRESETTABLE BCD/DECADE UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS 317K MOTOROLA 4145560
3 SN74LS191NDS Synchronous Up/Down Counter 197K 暂无图片 3756737