관련 데이터시트
74LS190Synchronous Up/Down Counters With Down/Up Mode Control - Texas Instruments
74LS190Synchronous Up/Down Decade Counters(single clock line) - Hitachi Semiconductor
74LS190PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS - Motorola Semiconductors
74LS191Synchronous Up/Down Counters With Down/Up Mode Control - Texas Instruments
74LS191PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS - Motorola Semiconductors
74LS191Synchronous Up/Down 4-bit Binary Counters(single clock line) - Hitachi Semiconductor
74LS191Synchronous 4-Bit Up/Down Counter with Mode Control - Fairchild Semiconductor
74LS192PRESETTABLE BCD/DECADE UP/DOWN COUNTER PRESETTABLE 4-BIT BINARY UP/DOWN COUNTER - HITACHI
74LS192PRESETTABLE BCD/DECADE UP/DOWN COUNTER PRESETTABLE 4-BIT BINARY UP/DOWN COUNTER - ON Semiconductor