74LS191 查看數據表（PDF） - Motorola => Freescale

零件编号

产品描述 (功能)

生产厂家

74LS191

PRESETTABLE BCD/DECADE PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS

Motorola => Freescale 

SN54/74LS190 • SN54/74LS191

DIRECTION

CONTROL

ENABLE

CLOCK

U/D

CE

CP

RC

U/D

CE

CP

RC

U/D

CE

CP

RC

Figure a. n-Stage Counter Using Ripple Clock

DIRECTION

CONTROL

ENABLE

U/D

CE

CP

RC

U/D

CE

CP

RC

U/D

CE

CP

RC

CLOCK

Figure b. Synchronous n-Stage Counter Using Ripple Carry / Borrow

DIRECTION

CONTROL

ENABLE

CLOCK

U/D

CE

CP

TC

U/D

CE

CP

TC

U/D

CE

CP

TC

Figure c. Synchronous n-Stage Counter with Parallel Gated Carry / Borrow

FAST AND LS TTL DATA

5-347

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