SN54-74LS90 ON Semiconductor, SN54-74LS90 Datasheet
SN54-74LS90
Related parts for SN54-74LS90
SN54-74LS90 Summary of contents
Page 1
... DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER The SN54 / 74LS90, SN54 / 74LS92 and SN54 / 74LS93 are high-speed 4-bit ripple type counters partitioned into two sections. Each counter has a di- vide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight (LS93) section which are triggered by a HIGH-to-LOW transi- tion on the clock inputs ...
Page 2
... SN54/74LS90 SN54/74LS92 SN54/74LS93 LOGIC DIAGRAM LS90 LOGIC DIAGRAM LS92 ...
Page 3
... SN54/74LS90 SN54/74LS92 SN54/74LS93 FUNCTIONAL DESCRIPTION The LS90, LS92, and LS93 are 4-bit ripple type Decade, Divide-By-Twelve, and Binary Counters respectively. Each device consists of four master/slave flip-flops which are internally connected to provide a divide-by-two section and a divide-by-five (LS90), divide-by-six (LS92), or divide-by-eight (LS93) section ...
Page 4
... SN54/74LS90 SN54/74LS92 SN54/74LS93 LS90 MODE SELECTION RESET / SET INPUTS OUTPUTS HIGH Voltage Level L = LOW Voltage Level X = Don’t Care LS90 ...
Page 5
... SN54/74LS90 SN54/74LS92 SN54/74LS93 GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High I OL Output Current — Low DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE S Symbol b l Parameter Input HIGH Voltage Input LOW Voltage ...
Page 6
... SN54/74LS90 SN54/74LS92 SN54/74LS93 AC CHARACTERISTICS ( 5 pF) S Symbol Parameter f MAX CP 0 Input Clock Frequency f MAX CP 1 Input Clock Frequency t PLH Propagation Delay, t PHL CP 0 Input Output t PLH CP 0 Input Output t PHL t PLH CP 1 Input Output ...