Synchronous 4-Bit Binary Counters With 3-State Outputs

These binary Counters are programmable and offer synchronous and asynchronous SN74ALS561A clearing as well as synchronous and asynchronous loading. All synchronous functions are executed on the positive-going edge of the Clock
The clear function is initiated by applying a low level to either asynchronous clear (ACLR) or synchronous clear (SCLR). ACLR (direct clear) overrides all other functions of the device, while SCLR overrides only the other synchronous functions. Data is loaded from the A, B, C, and D inputs by applying a low level to asynchronous load (ALOAD) or by the combination of a low level at synchronous load (SLOAD) and a positive-going Clock transition. The counting function is enabled only when enable P (ENP), enable T (ENT), ACLR, ALOAD, SCLR, and SLOAD are all high.
A high level at the output-enable () input forces the Q outputs into the high-impedance state, and a low level enables those outputs. Counting is independent of OE. ENT is fed forward to enable the ripple-carry output (RCO) to produce a high-level pulse while the count is maximum (15). The clocked carry output (CCO) produces a high-level pulse for a duration equal to that of the low level of the Clock when RCO is high and the Counter is enabled (ENP and ENT are high); otherwise, CCO is low. CCO does not have the glitches commonly associated with a ripple-carry output. Cascading is normally accomplished by connecting RCO or CCO of the first Counter to ENT of the next Counter However, for very high-speed counting, RCO should be used for cascading because CCO does not become active until the Clock returns to the low level.
The SN54ALS561A is characterized for operation over the full military temperature range of -55?C to 125?C. The SN74ALS561A is characterized for operation from 0?C to 70?C.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74ALS561ANE4 Texas Instruments Synchronous 4-Bit Binary Counters With 3-State Outputs 20-PDIP 0 to 70
SN74ALS561AN Texas Instruments Synchronous 4-Bit Binary Counters With 3-State Outputs 20-PDIP 0 to 70
SN74ALS561ADWG4 Texas Instruments ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20, GREEN, PLASTIC, SOIC-20
SN74ALS561ADWRE4 Texas Instruments ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20, PLASTIC, SO-16
SN74ALS561ADWR Texas Instruments ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20, PLASTIC, SO-16
SN74ALS561ADWRG4 Texas Instruments ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20, GREEN, PLASTIC, SOIC-20
SN74ALS561ADW Texas Instruments ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20, PLASTIC, SO-16
SN74ALS561ADWE4 Texas Instruments ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20, PLASTIC, SO-16
SN74ALS561A 's PackagesSN74ALS561A 's pdf datasheet
SN74ALS561ADW SOIC
SN74ALS561ADWE4 SOIC
SN74ALS561ADWG4 SOIC
SN74ALS561ADWR SOIC
SN74ALS561ADWRE4 SOIC
SN74ALS561ADWRG4 SOIC
SN74ALS561AN PDIP
SN74ALS561ANE4 PDIP




SN74ALS561A Pinout, Pinouts
SN74ALS561A pinout,Pin out
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