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SN74AC373DW 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74AC373DW 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 6 page SN54AC373, SN74AC373 OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS SCAS540B – OCTOBER 1995 – REVISED JUNE 1996 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D 3-State Noninverting Outputs Drive Bus Lines Directly D Full Parallel Access for Loading D EPICt (Enhanced-Performance Implanted CMOS) 1- µm Process D Package Options Include Plastic Small-Outline (DW) Shrink Small-Outline (DB) and Thin Shrink Small-Outline (PW) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic (N) and Ceramic (J) DIPs description These 8-bit latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The devices are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight latches are D-type transparent latches. When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs. A buffered output-enable (OE) input can be used to place the eight outputs in either a normal 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. The high-impedance state and increased drive provide the capability to drive bus lines in bus-organized systems without need for interface or pullup components. OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The SN54AC373 is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74AC373 is characterized for operation from – 40 °C to 85°C. FUNCTION TABLE (each latch) INPUTS OUTPUT OE LE D Q L H H H L HL L L LX Q0 H X X Z Copyright © 1996, Texas Instruments Incorporated 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. EPIC is a trademark of Texas Instruments Incorporated. Please 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. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 OE 1Q 1D 2D 2Q 3Q 3D 4D 4Q GND VCC 8Q 8D 7D 7Q 6Q 6D 5D 5Q LE 3 2 1 20 19 910 11 12 13 4 5 6 7 8 18 17 16 15 14 8D 7D 7Q 6Q 6D 2D 2Q 3Q 3D 4D SN54AC373 . . . FK PACKAGE (TOP VIEW) SN54AC373 ...J OR W PACKAGE SN74AC373 . . . DB, DW, N, OR PW PACKAGE (TOP VIEW) |
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