74LS90 Series

Decade Counter

Catalog(5 parts)

Part	Trigger Type	Package / Case▲▼	Package / Case▲▼	Package / Case	Count Rate▲▼	Number of Bits per Element▲▼	Number of Elements▲▼	Mounting Type	Operating Temperature▲▼	Direction	Reset	Voltage - Supply▲▼	Voltage - Supply▲▼	Logic Type	Supplier Device Package	Package / Case▲▼	Package / Case▲▼
Texas Instruments SN74LS90D Counter IC Counter, Decade 1 Element 4 Bit Negative Edge 14-SOIC	Negative Edge	0.003899999894201755 m	0.003911599982529879 m	14-SOIC	42000000 Hz	4 ul	1 ul	Surface Mount	70 °C	Up	Asynchronous	4.75 V	5.25 V	Counter, Decade
Texas Instruments SN74LS90DE4 Counter IC Counter, Decade 1 Element 4 Bit Negative Edge 14-SOIC	Negative Edge	0.003899999894201755 m	0.003911599982529879 m	14-SOIC	42000000 Hz	4 ul	1 ul	Surface Mount	70 °C	Up	Asynchronous	4.75 V	5.25 V	Counter, Decade
Texas Instruments SN74LS90N Counter IC Counter, Decade 1 Element 4 Bit Negative Edge 14-PDIP	Negative Edge	0.007619999814778566 m	0.007619999814778566 m	14-DIP	42000000 Hz	4 ul	1 ul	Through Hole	70 °C	Up	Asynchronous	4.75 V	5.25 V	Counter, Decade
Texas Instruments SN74LS90DRG4 Counter IC Counter, Decade 1 Element 4 Bit Negative Edge 14-SOIC	Negative Edge	0.003899999894201755 m	0.003911599982529879 m	14-SOIC	42000000 Hz	4 ul	1 ul	Surface Mount	70 °C	Up	Asynchronous	4.75 V	5.25 V	Counter, Decade
Texas Instruments SN74LS90NSR Counter IC Counter, Decade 1 Element 4 Bit Negative Edge 14-SO	Negative Edge			14-SOIC	42000000 Hz	4 ul	1 ul	Surface Mount	70 °C	Up	Asynchronous	4.75 V	5.25 V	Counter, Decade	14-SO	0.0052999998442828655 m	0.005308600142598152 m

Key Features

• '90A, 'LS90 . . . Decade Counters'92A, 'LS92 . . . Divide By-Twelve Counters'93A, 'LS93 . . . 4-Bit Binary CountersTYPESTYPICALPOWER DISSIPATION'90A145 mW'92A, '93A130 mW'LS90, 'LS92, 'LS9345 mW'90A, 'LS90 . . . Decade Counters'92A, 'LS92 . . . Divide By-Twelve Counters'93A, 'LS93 . . . 4-Bit Binary CountersTYPESTYPICALPOWER DISSIPATION'90A145 mW'92A, '93A130 mW'LS90, 'LS92, 'LS9345 mW

Description

Each of these monolithic counters contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-five for the '90A and 'LS90, divide-by-six for the '92A and 'LS92, and the divide-by eight for the '93A and 'LS93. All of these counters have a gated zero reset and the '90A and 'LS90 also have gated set-to-nine inputs for use in BCD nine's complement applications. To use their maximum count length (decade, divide-by-twelve, or four-bit binary) of these counters, the CKB input is connected to the QAoutput. The input count pulses are applied to CKA input and the outputs are as described in the appropriate function table. A symmetrical divide-by-ten count can be obtained from the '90A or 'LS90 counters by connecting the QDoutput to the CKA input and applying the input count to the CKB input which gives a divide-by-ten square wave at output QA. Each of these monolithic counters contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-five for the '90A and 'LS90, divide-by-six for the '92A and 'LS92, and the divide-by eight for the '93A and 'LS93. All of these counters have a gated zero reset and the '90A and 'LS90 also have gated set-to-nine inputs for use in BCD nine's complement applications. To use their maximum count length (decade, divide-by-twelve, or four-bit binary) of these counters, the CKB input is connected to the QAoutput. The input count pulses are applied to CKA input and the outputs are as described in the appropriate function table. A symmetrical divide-by-ten count can be obtained from the '90A or 'LS90 counters by connecting the QDoutput to the CKA input and applying the input count to the CKB input which gives a divide-by-ten square wave at output QA.