74LS373

DM74LS373 • DM74LS374 3-STATE Octal D-Type Transparent Latches and Edge-Triggered Flip-Flops April 1986 Revised March 2000 DM74LS373 • DM74LS374 3-STATE Octal D-Type Transparent Latches and Edge-Triggered Flip-Flops General Description These 8-bit registers feature totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. The high-impedance state and increased high-logic level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight latches of the DM74LS373 are transparent Dtype latches meaning that while the enable (G) is HIGH the Q outputs will follow the data (D) inputs. When the enable is taken LOW the output will be latched at the level of the data that was set up. The eight flip-flops of the DM74LS374 are edge-triggered D-type flip flops. On the positive transition of the clock, the Q outputs will be set to the logic states that were set up at the D inputs. A buffered output control 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 output control does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or new data can be entered even while the outputs are OFF. Features s Choice of 8 latches or 8 D-type flip-flops in a single package s 3-STATE bus-driving outputs s Full parallel-access for loading s Buffered control inputs s P-N-P inputs reduce D-C loading on data lines Ordering Code: Order Number DM74LS373WM DM74LS373SJ DM74LS373N DM74LS374WM DM74LS374SJ IDM29901NC Package Number M20B M20D N20A M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. © 2000 Fairchild Semiconductor Corporation DS006431 www.fairchildsemi.com DM74LS373 • DM74LS374 Connection Diagrams DM74LS373 DM74LS374 Function Tables DM74LS373 Output Control L L L H H = HIGH Level (Steady State) DM74LS374 D H L X X Output H L Q0 Z X = Don’t Care Enable G H H L X Output Control L L L H Clock ↑ ↑ L X D H L X X Output H L Q0 Z L = LOW Level (Steady State) Z = High Impedance State ↑ = Transition from LOW-to-HIGH level Q0 = The level of the output before steady-state input conditions were established. Logic Diagrams DM74LS373 Transparent Latches DM74LS374 Positive-Edge-Triggered Flip-Flops www.fairchildsemi.com 2 DM74LS373 • DM74LS374 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Storage Temperature Range Operating Free Air Temperature Range 7V 7V −65°C to +150°C 0°C to +70°C Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. DM74LS373 Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL tW tSU tH TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Pulse Width (Note 3) Enable HIGH Enable LOW 15 15 5↓ 20↓ 0 70 Parameter Min 4.75 2 0.8 −2.6 24 Nom 5 Max 5.25 Units V V V mA mA ns ns ns °C Data Setup Time (Note 2) (Note 3) Data Hold Time (Note 2) (Note 3) Free Air Operating Temperature Note 2: The symbol (↓) indicates the falling edge of the clock pulse is used for reference. Note 3: TA = 25°C and VCC = 5V. DM74LS373 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOZH IOZL IOS ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Off-State Output Current with HIGH Level Output Voltage Applied Off-State Output Current with LOW Level Output Voltage Applied Short Circuit Output Current Supply Current Conditions VCC = Min, II = −18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 12 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max, VO = 2.7V VIH = Min, VIL = Max VCC = Max, VO = 0.4V VIH = Min, VIL = Max VCC = Max (Note 5) VCC = Max, OC = 4.5V, Dn, Enable = GND Note 4: All typicals are at VCC = 5V, TA = 25°C. Note 5: N ot more than one output should be shorted at a time, and the duration should not exceed one second. Min Typ (Note 4) Max −1.5 Units V V 2.4 3.1 0.35 0.5 0.4 0.1 20 −0.4 20 −20 V mA µA mA µA µA mA mA −50 24 −225 40 3 www.fairchildsemi.com DM74LS373 • DM74LS374 DM74LS373 Switching Characteristics at VCC = 5V and TA = 25°C RL = 667Ω Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output (Note 6) Output Disable Time from LOW Level Output (Note 6) Note 6: CL = 5 pF. From (Input) To (Output) Data to Q Data to Q Enable to Q Enable to Q Output Control to Any Q Output Control to Any Q Output Control to Any Q Output Control to Any Q CL = 45 pF Min Max 18 18 30 30 28 36 20 25 CL = 150 pF Min Max 26 27 38 36 36 50 Units ns ns ns ns ns ns ns ns DM74LS374 Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL tW tSU tH TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Pulse Width (Note 8) Clock HIGH Clock LOW 15 15 20↑ 1↑ 0 70 Parameter Min 4.75 2 0.8 −2.6 24 Nom 5 Max 5.25 Units V V V mA mA ns ns ns °C Data Setup Time (Note 7) (Note 8) Data Hold Time (Note 7) (Note 8) Free Air Operating Temperature Note 7: The symbol (↑) indicates the rising edge of the clock pulse is used for reference. Note 8: TA = 25°C and V CC = 5V. www.fairchildsemi.com 4 DM74LS373 • DM74LS374 DM74LS374 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOZH IOZL IOS ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Off-State Output Current with HIGH Level Output Voltage Applied Off-State Output Current with LOW Level Output Voltage Applied Short Circuit Output Current Supply Current Conditions VCC = Min, II = −18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 12 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max, VO = 2.7V VIH = Min, VIL = Max VCC = Max, VO = 0.4V VIH = Min, VIL = Max VCC = Max (Note 10) VCC = Max, Dn = GND, OC = 4.5V −50 27 2.4 3.1 0.35 0.25 0.5 0.4 0.1 20 −0.4 20 −20 −225 45 mA µA mA µA µA mA mA Min Typ (Note 9) Max −1.5 Units V V V Note 9: All typicals are at VCC = 5V, TA = 25°C. Note 10: Not more than one output should be shorted at a time, and the duration should not exceed one second. DM74LS374 Switching Characteristics at VCC = 5V and TA = 25°C RL = 667Ω Symbol fMAX tPLH tPHL tPZH tPZL tPHZ tPLZ Maximum Clock Frequency Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output (Note 11) Output Disable Time from LOW Level Output (Note 11) Note 11: CL = 5 pF. Parameter CL = 45 pF Min 35 28 28 28 28 20 25 Max CL = 150 pF Min 20 32 38 44 44 Max Units MHz ns ns ns ns ns ns 5 www.fairchildsemi.com DM74LS373 • DM74LS374 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B www.fairchildsemi.com 6 DM74LS373 • DM74LS374 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 7 www.fairchildsemi.com DM74LS373 • DM74LS374 3-STATE Octal D-Type Transparent Latches and Edge-Triggered Flip-Flops Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 8 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com