SN54AC373, SN74AC373 OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS SCAS540B – OCTOBER 1995 – REVISED JUNE 1996 D D D SN54AC373 . . . J OR W PACKAGE SN74AC373 . . . DB, DW, N, OR PW PACKAGE (TOP VIEW) 3-State Noninverting Outputs Drive Bus Lines Directly Full Parallel Access for Loading EPICt (Enhanced-Performance Implanted CMOS) 1-µm Process 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 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. The devices 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 SN54AC373 . . . FK PACKAGE (TOP VIEW) 2D 2Q 3Q 3D 4D 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. 8Q D 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 the highimpedance 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 OE LE D OUTPUT Q L H H H L H L L L L X Q0 H X X Z 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. EPIC is a trademark of Texas Instruments Incorporated. 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. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN54AC373, SN74AC373 OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS SCAS540B – OCTOBER 1995 – REVISED JUNE 1996 logic symbol† OE LE 1D 2D 3D 4D 5D 6D 7D 8D 1 11 3 logic diagram (positive logic) EN OE 1 C1 1D 2 4 5 7 6 8 9 13 12 14 15 17 16 18 19 LE 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . . . 0.6 W DW package . . . . . . . . . . . . . . . . . . 1.6 W N package . . . . . . . . . . . . . . . . . . . . 1.3 W PW package . . . . . . . . . . . . . . . . . . 0.7 W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils, except for the N package, which has a trace length of zero. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN54AC373, SN74AC373 OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS SCAS540B – OCTOBER 1995 – REVISED JUNE 1996 recommended operating conditions (see Note 3) VCC VIH Supply voltage VCC = 3 V VCC = 4.5 V High-level input voltage VCC = 5.5 V VCC = 3 V VIL Low-level input voltage VI VO MIN MAX 2 6 2 6 2.1 2.1 3.15 3.15 0 0 High-level output current Low-level output current ∆t /∆v MAX VCC = 4.5V VCC = 5.5 V Output voltage IOL SN74AC373 MIN 3.85 Input voltage IOH SN54AC373 3.85 0.9 0.9 1.35 1.35 1.65 1.65 VCC VCC 0 0 VCC VCC – 12 – 12 – 24 – 24 VCC = 5.5 V VCC = 3 V – 24 – 24 12 12 VCC = 4.5 V VCC = 5.5 V 24 24 24 24 TA Operating free-air temperature NOTE 3: Unused inputs must be held high or low to prevent them from floating. V V VCC = 3 V VCC = 4.5 V Input transition rise or fall rate UNIT V V V mA mA 0 8 0 8 ns / V – 55 125 – 40 85 °C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = – 50 µA VOH IOH = – 12 mA IOH = – 24 mA IOL = 50 µA VOL IOL = 12 mA IOL = 24 mA II IOZ VI = VCC or GND VO = VCC or GND ICC Ci VI = VCC or GND, VI = VCC or GND IO = 0 VCC MIN TA = 25°C TYP MAX SN54AC373 SN74AC373 MIN MIN MAX 3V 2.9 2.9 2.9 4.5 V 4.4 4.4 4.4 5.5 V 5.4 5.4 5.4 3V 2.56 2.4 2.46 4.5 V 3.86 3.7 3.76 5.5 V 4.86 4.7 MAX UNIT V 4.76 3V 0.1 0.1 0.1 4.5 V 0.1 0.1 0.1 5.5 V 0.1 0.1 0.1 3V 0.36 0.5 0.44 4.5 V 0.36 0.5 0.44 5.5 V 0.36 0.5 0.44 5.5 V ± 0.1 ±1 ±1 µA 5.5 V ± 0.25 ±5 ± 2.5 µA 5.5 V 4 80 40 µA 5V POST OFFICE BOX 655303 4.5 • DALLAS, TEXAS 75265 V pF 3 SN54AC373, SN74AC373 OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS SCAS540B – OCTOBER 1995 – REVISED JUNE 1996 timing requirements over recommended operating free-air temperature range, VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) TA = 25°C MIN MAX SN54AC373 SN74AC373 MIN MIN MAX MAX UNIT tw tsu Pulse duration, LE high 5.5 6.5 6 ns Setup time, data before LE↓ 5.5 6.5 6 ns th Hold time, data after LE↓ 1 1 1 ns timing requirements over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) TA = 25°C MIN MAX SN54AC373 SN74AC373 MIN MIN MAX MAX UNIT tw tsu Pulse duration, LE high 4 5 4.5 ns Setup time, data before LE↓ 4 5 4.5 ns th Hold time, data after LE↓ 1 1 1 ns switching characteristics over recommended operating free-air temperature range, VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) PARAMETER TO (INPUT) TO (OUTPUT) tPLH tPHL D Q tPLH tPHL LE Q tPZH tPZL OE Q tPHZ tPLZ OE Q TA = 25°C MIN TYP MAX SN54AC373 SN74AC373 MIN MAX MIN MAX 1.5 10 13.5 1 16.5 1.5 15 1.5 9.5 13.0 1 16 1.5 14.5 1.5 10 13.5 1 16.5 1.5 15 1.5 9.5 12.5 1 15 1.5 14 1.5 9 11.5 1 14 1 13 1.5 8.5 11.5 1 13.5 1 13 1.5 10 12.5 1 16 1 14.5 1.5 8 11.5 1 13 1 12.5 UNIT ns ns ns ns switching characteristics over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) PARAMETER TO (INPUT) TO (OUTPUT) tPLH tPHL D Q tPLH tPHL LE Q tPZH tPZL OE Q tPHZ tPLZ OE Q MIN TA = 25°C TYP MAX SN54AC373 SN74AC373 MIN MAX MIN MAX 1.5 7 9.5 1 11.5 1.5 10.5 1.5 7 9.5 1 11.5 1.5 10.5 1.5 7.5 9.5 1 12 1.5 10.5 1.5 7 9.5 1 11 1.5 10.5 1.5 7 8.5 1 10.5 1 9.5 1.5 6.5 8.5 1 10 1 9.5 1.5 8 11 1 13.5 1 12.5 1.5 6.5 8.5 1 10.5 1 10 UNIT ns ns ns ns operating characteristics, VCC = 5 V, TA = 25°C PARAMETER Cpd 4 TEST CONDITIONS Power dissipation capacitance CL = 50 pF, POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 f = 1 MHz TYP UNIT 40 pF SN54AC373, SN74AC373 OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS SCAS540B – OCTOBER 1995 – REVISED JUNE 1996 PARAMETER MEASUREMENT INFORMATION 2 × VCC S1 500 Ω From Output Under Test Open TEST S1 tPLH /tPHL tPLZ /tPZL tPHZ /tPZH Open 2 × VCC Open 500 Ω CL = 50 pF (see Note A) LOAD CIRCUIT VCC 50% VCC Timing Input 0V tw tsu 3V Input 50% VCC 50% VCC Data Input VOLTAGE WAVEFORMS Output Control (low-level enabling) VCC 50% VCC 0V tPHL tPLH In-Phase Output 50% VCC Out-of-Phase Output VOH 50% VCC VOL 50% VCC VCC 50% VCC VOH 50% VCC VOL Output Waveform 2 S1 at Open (see Note B) 50% VCC 0V tPZL [ VCC tPLZ Output Waveform 1 S1 at 2 × VCC (see Note B) tPLH tPHL 50% VCC 0V VOLTAGE WAVEFORMS 50% VCC VCC 50% VCC 0V Input th 50% VCC tPHZ tPZH VOLTAGE WAVEFORMS VOL + 0.3 V VOL 50% VCC VOH – 0.3 V VOH [0V VOLTAGE WAVEFORMS NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns. D. The outputs are measured one at a time with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 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. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright 1998, Texas Instruments Incorporated