Synchronous 4-Bit Up/Down Binary Counters

These synchronous presettable Counters SN74LS169B feature an internal carry look-ahead for cascading in high speed counting applications. The 'LS169B and 'S169 are 4-bit binary Counters Synchronous operation is provided by having all Flip-Flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation helps eliminate the output counting spikes that are normally associated with asynchronous (ripple-clock) Counters A buffered Clock input triggers the four master-slave Flip-Flops on the rising (positive-going) edge of the Clock waveform.
These Counters are fully programmable; that is the outputs may each be preset to either level. The load input circuitry allows loading with the carry-enable output of cascaded Counters As loading is synchronous, setting up a low level at the load input disables the Counter and causes the outputs to agree with the data inputs after the next Clock pulse.
The carry look-ahead circuitry provides for cascading Counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are two count-enable inputs and a carry output. Both count enable inputs (ENP, ENT) must be low to count. The direction of the count is determined by the level of the up/down input. When the input is high, the Counter counts up; when low, it counts down. Input ENT is fed forward to enable the carry output. The carry output thus enabled will produce a low-level output pulse with a duration approximately equal to the high portion of the QA output when counting up and approximately equal to the low portion of the QA output when counting down. This low-level overflow carry pulse CAN be used to enable successive cascaded stages. Transitions at the ENP or ENT inputs are allowed regardless of the level of the Clock input. All inputs are diode-clamped to minimize transmission-line effects, thereby simplifying system design.
These Counters feature a fully independent Clock circuit. Changes at control inputs (ENP, ENT, LOAD, U/D) that will modify the operating mode have no effect until clocking occurs. The function of the Counter (whether enabled, disabled, loading, or counting) will be dictated solely by the conditions meeting the stable setup and hold times.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74LS169BD Texas Instruments Synchronous 4-Bit Up/Down Binary Counters 16-SOIC 0 to 70
SN74LS169BN Texas Instruments Synchronous 4-Bit Up/Down Binary Counters 16-PDIP 0 to 70
SN74LS169BNE4 Texas Instruments Synchronous 4-Bit Up/Down Binary Counters 16-PDIP 0 to 70
SN74LS169BDE4 Texas Instruments LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
SN74LS169BDG4 Texas Instruments LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
SN74LS169BNSR Texas Instruments LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, SOP-16
SN74LS169BNSRE4 Texas Instruments LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, SOP-16
SN74LS169BNSRG4 Texas Instruments LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN, PLASTIC, SOP-16
SN74LS169B 's PackagesSN74LS169B 's pdf datasheet
SN74LS169BD SOIC
SN74LS169BDE4 SOIC
SN74LS169BDG4 SOIC
SN74LS169BN PDIP
SN74LS169BNE4 PDIP
SN74LS169BNSR SO
SN74LS169BNSRE4 SO
SN74LS169BNSRG4 SO




SN74LS169B Pinout, Pinouts
SN74LS169B pinout,Pin out
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