Details, datasheet, quote on part number: SN74ALS29823DW
CategoryLogic => Flip-Flops => D-Type (3-State) Flip-Flops
TitleD-Type (3-State) Flip-Flops
Descriptionti SN74ALS29823, 9-Bit Bus Interface Flip-flops With 3-State Outputs
CompanyTexas Instruments, Inc.
DatasheetDownload SN74ALS29823DW datasheet
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Features, Applications

Functionally Equivalent to AMD's AM29823 Provide Extra Data Width Necessary for Wider Address/Data Paths or Buses With Parity Outputs Have Undershoot-Protection Circuitry Power-Up High-Impedance State Buffered Control Inputs Reduce dc Loading Effects Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs


These 9-bit flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing wider buffer registers, I/O ports, bidirectional bus drivers, parity bus interfacing, and working registers. With the clock-enable (CLKEN) input low, the nine D-type edge-triggered flip-flops enter data on the low-to-high transitions of the clock (CLK) input. Taking CLKEN high disables the clock buffer, latching the outputs. The ALS29823 have noninverting data (D) inputs. Taking the clear (CLR) input low causes the nine Q outputs to go low independently of the clock. A buffered output-enable (OE) input places the nine outputs in either a normal logic state (high or low logic levels) or a high-impedance state. The outputs also are in the high-impedance state during power-up and power-down conditions. The outputs remain in the high-impedance state while the device is powered down. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components. OE does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The SN54ALS29823 is characterized for operation over the full military temperature range to 125C. The SN74ALS29823 is characterized for operation from to 70C.


PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, VCC. 7 V Input voltage, VI. 5.5 V Voltage applied to a disabled high-impedance output. 5.5 V Operating free-air temperature range, TA: to 125C Storage temperature range. to 150C

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

SN54ALS29823 MIN VCC VIH VIL IOH IOL tw Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Pulse duration CLR low CLK high or low CLR inactive tsu Setup time before CLK Data CLKEN high or low th TA Hold time after CLK Operating free-air temperature CLKEN Data C ns NOM 5 MAX 5.5 UNIT mA ns

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)

PARAMETER VIK VOH VOL IOZH IOZL II IIH IIL IOS ICC TEST CONDITIONS VCC 4.5 V, VCC 4.5 5V VCC 4.5 V, VCC 5.5 V, VCC 5.5 V, VCC 5.5 V, VCC 5.5 V, VCC 5.5 V, VCC 5.5 V, VCC 18 mA IOH 12 mA IOH 18 mA IOL = 0 Outputs high Outputs low Outputs open All typical values are at VCC 25C. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. 75 SN54ALS29823 MIN TYP MAX mA 3.3 UNIT A mA


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