7801102SA中文资料
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SN54LS373, SN54LS374, SN54S373, SN54S374,SN74LS373, SN74LS374, SN74S373, SN74S374OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPS SDLS165B – OCTOBER 1975 – REVISED AUGUST 2002
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DChoice of Eight Latches or Eight D-Type
Flip-Flops in a Single PackageD3-State Bus-Driving Outputs
DFull Parallel Access for Loading
DBuffered Control Inputs
DClock-Enable Input Has Hysteresis to
Improve Noise Rejection (’S373 and ’S374)DP-N-P Inputs Reduce DC Loading on Data
Lines (’S373 and ’S374)
descriptionThese 8-bit registers feature 3-state outputsdesigned specifically for driving highly capacitiveor relatively low-impedance loads. Thehigh-impedance 3-state and increasedhigh-logic-level drive provide these registers withthe capability of being connected directly to anddriving the bus lines in a bus-organized systemwithout need for interface or pullup components.These devices are particularly attractive forimplementing buffer registers, I/O ports,bidirectional bus drivers, and working registers.
The eight latches of the ’LS373 and ’S373 aretransparent D-type latches, meaning that whilethe enable (C or CLK) input is high, the Q outputsfollow the data (D) inputs. When C or CLK is takenlow, the output is latched at the level of the datathat was set up.
The eight flip-flops of the ’LS374 and ’S374 areedge-triggered D-type flip-flops. On the positivetransition of the clock, the Q outputs are set to thelogic states that were set up at the D inputs.
Schmitt-trigger buffered inputs at the enable/clock lines of the ’S373 and ’S374 devices simplify system designas ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A bufferedoutput-control (OC) input can be used to place the eight outputs in either a normal logic state (high or low logiclevels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus linessignificantly.
OC does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or newdata can be entered, even while the outputs are off.
Copyright 2002, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SN54LS373, SN54LS374, SN54S373,SN54S374 . . . J OR W PACKAGESN74LS373, SN74S374 . . . DW, N, OR NS PACKAGESN74LS374 . . . DB, DW, N, OR NS PACKAGESN74S373 . . . DW OR N PACKAGE(TOP VIEW)
32120199101112134
5678
1817161514
8D7D7Q6Q6D
2D2Q3Q3D4D
SN54LS373, SN54LS374, SN54S373,SN54S374 . . . FK PACKAGE(TOP VIEW)
1D1QOC5Q5D8Q
4QGND
C
VCC
1234 567891020191817161514131211
OC1Q1D2D2Q3Q3D4D4QGNDVCC8Q8D7D7Q6Q6D5D5QC†
†C 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.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.
On products compliant to MIL-PRF-38535, all parameters are tested
unlss othrwis notd. On all othr products, productionprocessing does not necessarily include testing of all parameters.
元器件交易网www.cecb2b.comSN54LS373, SN54LS374, SN54S373, SN54S374,SN74LS373, SN74LS374, SN74S373, SN74S374OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPS SDLS165B – OCTOBER 1975 – REVISED AUGUST 2002
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ORDERING INFORMATIONTAPACKAGE†ORDERABLEPART NUMBERTOP-SIDEMARKING
TubeSN74LS373NSN74LS373N
PDIPNTubeSN74LS374NSN74LS374NPDIP – NTubeSN74S373NSN74S373N
TubeSN74S374NSN74S374NTubeSN74LS373DWTape and reelSN74LS373DWRLS373
TubeSN74LS374DW°Cto70°CSOICDWTape and reelSN74LS374DWRLS374
0C to 70SOIC – DWTubeSN74S373DW
Tape and reelSN74S373DWRS373
TubeSN74S374DWTape and reelSN74S374DWRS374
Tape and reelSN74LS373NSR74LS373SOP – NSTape and reelSN74LS374NSR74LS374
Tape and reelSN74S374NSR74S374SSOP – DBTape and reelSN74LS374DBRLS374ATubeSN54LS373JSN54LS373JTubeSNJ54LS373JSNJ54LS373JTubeSN54LS374JSN54LS374J
CDIPJTubeSNJ54LS374JSNJ54LS374JCDIP – JTubeSN54S373JSN54S373J
TubeSNJ54S373JSNJ54S373JTubeSN54S374JSN54S374J–55°C to 125°CTubeSNJ54S374JSNJ54S374J
TubeSNJ54LS373WSNJ54LS373WCFP – WTubeSNJ54LS374WSNJ54LS374W
TubeSNJ54S374WSNJ54S374WTubeSNJ54LS373FKSNJ54LS373FK
LCCCFKTubeSNJ54LS374FKSNJ54LS374FKLCCC – FKTubeSNJ54S373FKSNJ54S373FK
