Revised August 1999 74F373 Octal Transparent Latch with 3-STATE Outputs General Description Features The 74F373 consists of eight latches with 3-STATE outputs for bus organized system applications. The flip-flops appear transparent to the data when Latch Enable (LE) is HIGH. When LE is LOW, the data that meets the setup times is latched. Data appears on the bus when the Output Enable (OE) is LOW. When OE is HIGH the bus output is in the high impedance state. ■ Eight latches in a single package ■ 3-STATE outputs for bus interfacing ■ Guaranteed 4000V minimum ESD protection Ordering Code: Order Number 74F373SC 74F373SJ 74F373MSA Package Number M20B M20D 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 MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 74F373PC Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC © 1999 Fairchild Semiconductor Corporation DS009523 www.fairchildsemi.com 74F373 Octal Transparent Latch with 3-STATE Outputs May 1988 74F373 Unit Loading/Fan Out Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL D0–D7 Data Inputs 1.0/1.0 20 µA/−0.6 mA LE Latch Enable Input (Active HIGH) 1.0/1.0 20 µA/−0.6 mA OE Output Enable Input (Active LOW) O0–O7 3-STATE Latch Outputs 1.0/1.0 20 µA/−0.6 mA 150/40 (33.3) −3 mA/24 mA (20 mA) Truth Table Functional Description The 74F373 contains eight D-type latches with 3-STATE output buffers. When the Latch Enable (LE) input is HIGH, data on the Dn inputs enters the latches. In this condition the latches are transparent, i.e., a latch output will change state each time its D input changes. When LE is LOW, the latches store the information that was present on the D inputs a setup time preceding the HIGH-to-LOW transition of LE. The 3-STATE buffers are controlled by the Output Enable (OE) input. When OE is LOW, the buffers are in the bi-state mode. When OE is HIGH the buffers are in the high impedance mode but this does not interfere with entering new data into the latches. Inputs Output LE OE Dn On H L H H H L L L L L X On (no change) X H X Z H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance State Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 Recommended Operating Conditions Storage Temperature −65°C to +150°C Ambient Temperature under Bias −55°C to +125°C Free Air Ambient Temperature Junction Temperature under Bias −55°C to +150°C Supply Voltage 0°C to +70°C +4.5V to +5.5V −0.5V to +7.0V VCC Pin Potential to Ground Pin Input Voltage (Note 2) −0.5V to +7.0V Input Current (Note 2) −30 mA to +5.0 mA Voltage Applied to Output in HIGH State (with VCC = 0V) Standard Output −0.5V to VCC 3-STATE Output −0.5V to +5.5V Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Current Applied to Output Note 2: Either voltage limit or current limit is sufficient to protect inputs. twice the rated IOL (mA) in LOW State (Max) ESD Last Passing Voltage (Min) 4000V DC Electrical Characteristics Symbol Parameter Min Typ Max VCC VIL Input LOW Voltage 0.8 V VCD Input Clamp Diode Voltage −1.2 V Min VOH Output HIGH 10% VCC 2.5 Voltage 10% VCC 2.4 5% VCC 2.7 V Min 5% VCC 2.7 0.5 V Min IOL = 24 mA 5.0 µA Max VIN = 2.7V 7.0 µA Max VIN = 7.0V 50 µA Max VOUT = VCC V 0.0 3.75 µA 0.0 −0.6 mA Max VIN = 0.5V 50 µA Max VOUT = 2.7V Output LOW V Conditions Input HIGH Voltage VOL 2.0 Units VIH Recognized as a HIGH Signal Recognized as a LOW Signal IIN = −18 mA IOH = −1 mA IOH = −3 mA IOH = −1 mA IOH = −3 mA 10% VCC Voltage IIH Input HIGH Current IBVI Input HIGH Current Breakdown Test ICEX Output HIGH Leakage Current VID Input Leakage Test IOD 4.75 Output Leakage Circuit Current IIL Input LOW Current IOZH Output Leakage Current IOZL Output Leakage Current IOS Output Short-Circuit Current IZZ Bus Drainage Test ICCZ Power Supply Current −60 38 3 IID = 1.9 µA All Other Pins Grounded VIOD = 150 mV All Other Pins Grounded −50 µA Max VOUT = 0.5V −150 mA Max VOUT = 0V 500 µA 0.0V VOUT = 5.25V 55 mA Max VO = HIGH Z www.fairchildsemi.com 74F373 Absolute Maximum Ratings(Note 1) 74F373 AC Electrical Characteristics Symbol Parameter TA = +25°C TA = −55°C to +125°C TA = 0°C to +70°C VCC = +5.0V VCC = +5.0V VCC = +5.0V CL = 50 pF CL = 50 pF CL = 50 pF Min Typ Max Min Max Min Max tPLH Propagation Delay 3.0 5.3 7.0 3.0 8.5 3.0 8.0 tPHL Dn to On 2.0 3.7 5.0 2.0 7.0 2.0 6.0 tPLH Propagation Delay 5.0 9.0 11.5 5.0 15.0 5.0 13.0 tPHL LE to On 3.0 5.2 7.0 3.0 8.5 3.0 8.0 tPZH Output Enable Time 2.0 5.0 11.0 2.0 13.5 2.0 12.0 2.0 5.6 7.5 2.0 10.0 2.0 8.5 1.5 4.5 6.5 1.5 10.0 1.5 7.5 1.5 3.8 5.0 1.5 7.0 1.5 6.0 tPZL tPHZ Output Disable Time tPLZ Units ns ns ns ns AC Operating Requirements Symbol Parameter TA = +25°C TA = −55°C to +125°C VCC = +5.0V VCC = +5.0V Min Max Min Max TA = 0°C to +70°C VCC = +5.0V Min tS(H) Setup Time, HIGH or LOW 2.0 2.0 2.0 tS(L) Dn to LE 2.0 2.0 2.0 tH(H) Hold Time, HIGH or LOW 3.0 3.0 3.0 tH(L) Dn to LE 3.0 4.0 3.0 tW(H) LE Pulse Width, HIGH 6.0 6.0 6.0 www.fairchildsemi.com 4 Units Max ns ns 74F373 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 5 www.fairchildsemi.com 74F373 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide Package Number MSA20 www.fairchildsemi.com 6 74F373 Octal Transparent Latch with 3-STATE Outputs 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. 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