SN54F373, SN74F373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS SDFS076A – D2932, MARCH 1987 – REVISED OCTOBER 1993 SN54F373 . . . J PACKAGE SN74F373 . . . DB, DW, OR N PACKAGE (TOP VIEW) Eight Latches in a Single Package 3-State Bus-Driving True Outputs Full Parallel Access for Loading Buffered Control Inputs Package Options Include Plastic Small-Outline (SOIC) and Shrink Small-Outline (SSOP) Packages, Ceramic Chip Carriers, and Plastic and Ceramic DIPs OE 1Q 1D 2D 2Q 3Q 3D 4D 4Q GND description These 8-bit latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 VCC 8Q 8D 7D 7Q 6Q 6D 5D 5Q LE 1D 1Q OE VCC SN54F373 . . . FK PACKAGE (TOP VIEW) The eight latches of the ′F373 are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs will follow the data (D) inputs. When the latch enable is taken low, the Q outputs are latched at the logic levels set up at the D inputs. 2D 2Q 3Q 3D 4D 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 8D 7D 7Q 6Q 6D 4Q GND LE 5Q 5D 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 a 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 without need for interface or pullup components. 8Q • • • • • The output-enable (OE) input 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 SN74F373 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count and functionality of standard small-outline packages in less than half the printed-circuit-board area. The SN54F373 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74F373 is characterized for operation from 0°C to 70°C. FUNCTION TABLE (each latch) INPUTS OE LE D OUTPUT Q L H H H L H L L L L X Q0 H X X Z Copyright 1993, 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. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN54F373, SN74F373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS SDFS076A – D2932, MARCH 1987 – REVISED OCTOBER 1993 logic symbol† OE LE 1D 2D 3D 4D 5D 6D 7D 8D 1 11 3 logic diagram (positive logic) EN OE C1 2 1D 4 5 7 6 8 9 13 12 14 15 17 16 18 19 LE 1 11 1Q C1 2Q 3Q 1D 3 2 1Q 1D 4Q 5Q 6Q 7Q To Seven Other Channels 8Q † 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 range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 1.2 V to 7 V Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA to 5 mA Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . – 0.5 V to 5.5 V Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC Current into any output in the low state: SN54F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA SN74F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Operating free-air temperature range: SN54F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74F373 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C ‡ 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. NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed. recommended operating conditions SN54F373 VCC VIH Supply voltage VIL IIK Low-level input voltage IOH IOL TA Operating free-air temperature 2 High-level input voltage SN74F373 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 2 UNIT V V 0.8 0.8 V – 18 – 18 mA High-level output current –3 –3 mA Low-level output current 20 24 mA 70 °C Input clamp current – 55 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 125 0 SN54F373, SN74F373 OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS SDFS076A – D2932, MARCH 1987 – REVISED OCTOBER 1993 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH SN54F373 TYP† MAX TEST CONDITIONS VCC = 4.5 V, VCC = 4 4.5 5V VCC = 4.75 V, MIN II = – 18 mA IOH = – 1 mA – 1.2 IOH = – 3 mA IOH = – 1 mA to – 3 mA VOL VCC = 4 4.5 5V IOL = 20 mA IOL = 24 mA IOZH IOZL VCC = 5.5 V, VCC = 5.5 V, VO = 2.7 V VO = 0.5 V II IIH VCC = 5.5 V, VCC = 5.5 V, IIL IOS‡ VCC = 5.5 V, VCC = 5.5 V, SN74F373 TYP† MAX MIN – 1.2 2.5 3.4 2.5 3.4 2.4 3.3 2.4 3.3 UNIT V V 2.7 0.3 0.5 0.35 0.5 V 50 50 µA – 50 – 50 µA VI = 7 V VI = 2.7 V 0.1 0.1 mA 20 20 µA VI = 0.5 V VO = 0 – 0.6 – 0.6 mA –150 mA 55 mA – 60 –150 – 60 ICCZ VCC = 5.5 V, See Note 2 38 55 38 † All typical values are at VCC = 5 V, TA = 25°C. ‡ Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. NOTE 2: ICCZ is measured with OE at 4.5 V and all other inputs grounded. timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC = 5 V, TA = 25°C SN54F373 SN74F373 MIN MIN UNIT ′F373 MIN MAX MAX MAX tw Pulse duration, LE high 6 6 6 ns tsu Setup time, data before LE↓ 2 2 2 ns th Hold time, data after LE↓ 3 3 3 ns switching characteristics (see Note 3) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, RL = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX§ ′F373 tPLH tPHL D Q tPLH tPHL LE Q tPZH tPZL OE Q tPHZ tPLZ OE Q UNIT SN54F373 SN74F373 MIN TYP MAX MIN MAX MIN MAX 2.2 4.9 7 2.2 8.5 2.2 8 1.2 3.3 5 1.2 7 1.2 6 4.2 8.6 11.5 4.2 15 4.2 13 2.2 4.8 7 2.2 8.5 2.2 8 1.2 4.6 11 1.2 13.5 1.2 12 1.2 5.2 7.5 1.2 10 1.2 8.5 1.2 4.1 6.5 1.2 10 1.2 7.5 1.2 3.4 6 1.2 7 1.2 6 ns ns ns ns § For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 3: Load circuits and waveforms are shown in Section 1. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. 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