SN54BCT374, SN74BCT374 OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994 • • • • • SN54BCT374 . . . J OR W PACKAGE SN74BCT374 . . . DB OR DW OR N PACKAGE (TOP VIEW) State-of-the-Art BiCMOS Design Significantly Reduces ICC Full Parallel Access for Loading Buffered Control Inputs 3-State True Outputs Drive Bus Lines or Buffer Memory Address Registers ESD Protection Exceeds 2000 V Per MIL-Std-883C, Method 3015 Package Options Include Plastic Small-Outline (DW) and Shrink Small-Outline (DB) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic and Ceramic 300-mil DIPs (J, N) OE 1Q 1D 2D 2Q 3Q 3D 4D 4Q GND 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 CLK SN54BCT374 . . . FK PACKAGE (TOP VIEW) 1D 1Q OE VCC description These 8-bit flip-flops 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. 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 CLK 5Q 5D The eight flip-flops of the ′BCT374 are edge-triggered D-type flip-flops. On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels that were set up at the data (D) inputs. 8Q • A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low) 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 the increased drive provide the capability to drive bus lines without need for interface or pullup components. The output-enable (OE) input does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The SN54BCT374 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74BCT374 is characterized for operation from 0°C to 70°C. FUNCTION TABLE (each flip-flop) INPUTS OE CLK D OUTPUT Q L ↑ H H L ↑ L L L H or L X Q0 H X X Z Copyright 1994, 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 2–1 SN54BCT374, SN74BCT374 OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994 logic symbol† OE CLK 1 11 logic diagram (positive logic) OE EN C1 CLK 1 11 C1 1D 2D 3D 4D 5D 6D 7D 8D 3 2 1D 4 5 7 6 8 9 13 12 14 15 17 16 18 19 1Q 1D 3 2 1Q 1D 2Q 3Q 4Q 5Q To Seven Other Channels 6Q 7Q 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . – 0.5 V to 5.5 V Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC Input clamp current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA Current into any output in the low state: SN54BCT374 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA SN74BCT374 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Operating free-air temperature range: SN54BCT374 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74BCT374 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 and output voltage ratings may be exceeded if the input and output current ratings are observed. recommended operating conditions SN54BCT374 SN74BCT374 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IIK Low-level input voltage 0.8 0.8 V Input clamp current –18 –18 mA IOH IOL High-level output current –12 –15 mA 64 mA TA Operating free-air temperature 70 °C 2–2 High-level input voltage 2 Low-level output current 2 48 – 55 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 125 0 V V SN54BCT374, SN74BCT374 OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH SN54BCT374 TYP† MAX TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V MIN II = –18 mA IOH = – 3 mA SN74BCT374 TYP† MAX MIN –1.2 IOH = –12 mA IOH = –15 mA 2.4 3.3 2 3.2 –1.2 2.4 V 3.3 V 2 0.38 UNIT 3.1 VOL VCC = 4 4.5 5V IOL = 48 mA IOL = 64 mA 0.55 II IIH VCC = 5.5 V, VCC = 5.5 V, VI = 5.5 V VI = 2.7 V 0.4 0.4 20 20 µA IIL IOS‡ VCC = 5.5 V, VCC = 5.5 V, VI = 0.5 V VO = 0 – 0.6 – 0.6 mA – 225 mA IOZH IOZL VCC = 5.5 V, VCC = 5.5 V, VO = 2.7 V VO = 0.5 V 50 µA ICCL ICCH VCC = 5.5 V VCC = 5.5 V ICCZ Ci VCC = 5.5 V VCC = 5 V, 0.42 –100 – 225 –100 50 0.55 V mA – 50 µA 37 60 37 60 mA 2 5 2 5 mA 5 8 5 8 mA – 50 VI = 2.5 V or 0.5 V VO = 2.5 V or 0.5 V 6 Co VCC = 5 V, 10 † All typical values are at VCC = 5 V, TA = 25°C. ‡ Not more than one output should be tested at a time, and the duration of the test should not exceed one second. 6 pF 10 pF timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC = 5 V, TA = 25°C MIN fclock tw Clock frequency Pulse duration CLK high tsu Setup time before CLK↑ th Hold time after CLK↑ MAX SN54BCT374 MIN 70 MAX SN74BCT374 MIN 70 UNIT MAX 70 MHz 7 8 7 ns Data high or low 6.5 6.5 6.5 ns Data high or low 0 0 0 ns POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–3 SN54BCT374, SN74BCT374 OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994 switching characteristics (see Note 2) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† ′BCT374 MIN fmax tPLH tPHL tPZH tPZL tPHZ TYP SN54BCT374 MAX 70 CLK Q OE Q MIN SN74BCT374 MAX 70 POST OFFICE BOX 655303 MIN MAX 70 MHz 2 7.2 9.1 2 11.6 2 10.6 2 7.1 8.8 2 10.6 2 10 1 8.3 10.1 1 12.7 1 12.3 1 8.6 10.6 1 13 1 12.7 1 6.8 1 6.8 1 4.7 6.3 1 7.1 OE Q tPLZ 1 4.8 6.3 1 7.5 † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 2: Load circuits and voltage waveforms are shown in Section 1. 2–4 UNIT • DALLAS, TEXAS 75265 ns ns ns 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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