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1、SN54LS373, SN54LS374, SN54S373, SN54S374, SN74LS373, SN74LS374, SN74S373, SN74S374 OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPSSDLS165B OCTOBER 1975 REVISED AUGUST 20021POST OFFICE BOX 655303 DALLAS, TEXAS 75265?Choice of Eight Latches or Eight D-Type Flip-Flops in a Single Package
2、 ?3-State Bus-Driving Outputs ?Full Parallel Access for Loading ?Buffered Control Inputs ?Clock-Enable Input Has Hysteresis to Improve Noise Rejection (S373 and S374) ?P-N-P Inputs Reduce DC Loading on Data Lines (S373 and S374)descriptionThese 8-bit registers feature 3-state outputs designed specif
3、ically for driving highly capacitive or relatively low-impedance loads. The high-impedance 3-state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pullup
4、components. These devices are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.The eight latches of the LS373 and S373 are transparent D-type latches, meaning that while the enable (C or CLK) input is high, the Q outputs follow th
5、e data (D) inputs. When C or CLK is taken low, the output is latched at the level of the data that was set up.The eight flip-flops of the LS374 and S374 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs are set to the logic states that were set up at the D
6、inputs.Schmitt-trigger buffered inputs at the enable/clock lines of the S373 and S374 devices simplify system design as ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A buffered output-control (OC) input can be used to place the eight outputs in either a norma
7、l logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.OC does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or new data can be entered,
8、even while the outputs are off.Copyright 2002, Texas Instruments IncorporatedPlease be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet
9、.SN54LS373, SN54LS374, SN54S373, SN54S374 . . . J OR W PACKAGE SN74LS373, SN74S374 . . . DW, N, OR NS PACKAGE SN74LS374 . . . DB, DW, N, OR NS PACKAGE SN74S373 . . . DW OR N PACKAGE (TOP VIEW)32120 199 10 11 12 134567818171615148D 7D 7Q 6Q 6D2D 2Q 3Q 3D 4DSN54LS373, SN54LS374, SN54S373, SN54S374 . .
10、 . FK PACKAGE (TOP VIEW)1D 1Q OC 5Q 5D8Q4Q GND C VCC1234 567891020191817161514131211OC 1Q 1D 2D 2Q 3Q 3D 4D 4Q GNDVCC 8Q 8D 7D 7Q 6Q 6D 5D 5Q CC for LS373 and S373; CLK for LS374 and S374.C for LS373 and S373; CLK for LS374 and S374.PRODUCTION DATA information is current as of publication date. Prod
11、ucts conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing doe
12、s not necessarily include testing of all parameters.SN54LS373, SN54LS374, SN54S373, SN54S374, SN74LS373, SN74LS374, SN74S373, SN74S374 OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPSSDLS165B OCTOBER 1975 REVISED AUGUST 20022POST OFFICE BOX 655303 DALLAS, TEXAS 75265ORDERING INFORMATIO
13、NTAPACKAGEORDERABLE PART NUMBERTOP-SIDE MARKINGTubeSN74LS373NSN74LS373NPDIPNTubeSN74LS374NSN74LS374NPDIP NTubeSN74S373NSN74S373NTubeSN74S374NSN74S374NTubeSN74LS373DWLS373Tape and reelSN74LS373DWRLS373TubeSN74LS374DWLS3740C to 70CSOICDWTape and reelSN74LS374DWRLS3740C to 70CSOIC DWTubeSN74S373DWS373T
14、ape and reelSN74S373DWRS373TubeSN74S374DWS374Tape and reelSN74S374DWRS374Tape and reelSN74LS373NSR74LS373SOP NSTape and reelSN74LS374NSR74LS374Tape and reelSN74S374NSR74S374SSOP DBTape and reelSN74LS374DBRLS374ATubeSN54LS373JSN54LS373JTubeSNJ54LS373JSNJ54LS373JTubeSN54LS374JSN54LS374JCDIPJTubeSNJ54L
15、S374JSNJ54LS374JCDIP JTubeSN54S373JSN54S373JTubeSNJ54S373JSNJ54S373JTubeSN54S374JSN54S374J55C to 125CTubeSNJ54S374JSNJ54S374JTubeSNJ54LS373WSNJ54LS373WCFP WTubeSNJ54LS374WSNJ54LS374WTubeSNJ54S374WSNJ54S374WTubeSNJ54LS373FKSNJ54LS373FKLCCCFKTubeSNJ54LS374FKSNJ54LS374FKLCCC FKTubeSNJ54S373FKSNJ54S373F
16、KTubeSNJ54S374FKSNJ54S374FKPackage drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at SN54LS374, SN54S373, SN54S374, SN74LS373, SN74LS374, SN74S373, SN74S374 OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPSSDLS165B OCTOBER 1975 REVISED AUGUST 20023POST OFFICE BOX 655303 DALLAS, TEXAS 75265Function TablesLS373, S373 (each lat
