MC54/74F373 OCTAL TRANSPARENT LATCH WITH 3-STATE OUTPUTS The MC54/74F373 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. OCTAL TRANSPARENT LATCH WITH 3-STATE OUTPUTS FAST SCHOTTKY TTL • Eight Latches in a Single Package • 3-State Outputs for Bus Interfacing • ESD > 4000 Volts CONNECTION DIAGRAM (TOP VIEW) VCC 20 O7 19 D7 18 D6 17 O6 16 O5 15 D5 14 D4 13 O4 12 LE J SUFFIX CERAMIC CASE 732-03 20 11 1 N SUFFIX PLASTIC CASE 738-03 20 1 1 2 3 4 5 6 7 8 9 10 OE O0 D0 D1 O1 O2 D2 D3 O3 GND 20 1 LOGIC SYMBOL 3 11 1 4 7 8 13 14 17 18 ORDERING INFORMATION D0 D1 D2 D3 D4 D5 D6 D7 LE 5 6 MC54FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC VCC = PIN 20 GND = PIN 10 OE O0 O1 O2 O3 O4 O5 O6 O7 2 DW SUFFIX SOIC CASE 751D-03 9 12 15 16 19 GUARANTEED OPERATING RANGES Symbol Parameter VCC Supply Voltage TA Operating Ambient Temperature Range Min Typ Max Unit 54, 74 4.5 5.0 5.5 V 54 –55 25 125 °C 74 0 25 70 IOH Output Current — HIGH 54, 74 –3.0 mA IOL Output Current — LOW 54, 74 24 mA FAST AND LS TTL DATA 4-167 MC54/74F373 FUNCTIONAL DESCRIPTION The F373 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 one 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. LOGIC DIAGRAM D0 D1 D D2 D GO D3 D GO D4 D GO D5 D GO D6 D GO D7 D GO D GO GO LE OE O0 O1 O2 O3 O4 O5 O6 O7 NOTE: This diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage Min Typ Max 2.0 Unit Test Conditions V Guaranteed Input HIGH Voltage 0.8 V Guaranteed Input LOW Voltage –1.2 V IIN = –18 mA VCC = MIN 54, 74 2.4 3.3 V IOH = – 3.0 mA VCC = 4.5 V 74 2.7 3.3 V IOH = – 3.0 mA VCC = 4.75 V 0.5 V IOL = 24 mA VCC = MIN VOL Output LOW Voltage 0.35 IOZH Output OFF Current — HIGH 50 µA VOUT = 2.7 V VCC = MAX IOZL Output OFF Current — LOW –50 µA VOUT = 0.5 V VCC = MAX IIH Input HIGH Current 20 µA VIN = 2.7 V VCC = MAX 100 µA VIN = 7.0 V VCC = MAX –0.6 mA VIN = 0.5 V VCC = MAX –150 mA VOUT = 0 V VCC = MAX 55 mA OE = 4.5 V Dn, LE = GND VCC = MAX IIL Input LOW Current IOS Output Short Circuit Current (Note 2) ICCZ Power Supply Current (All Outputs OFF) –60 35 NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type. 2. Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 4-168 MC54/74F373 AC CHARACTERISTICS Symbol Parameter 54/74F 54F 74F TA = +25°C TA = –55°C to +125°C TA = 0°C to +70°C VCC = +5.0 V VCC = 5.0 V ± 10% VCC = 5.0 V ± 10% CL = 50 pF CL = 50 pF CL = 50 pF Min Typ Max Min Max Min Max Unit 7.0 3.0 8.5 3.0 8.0 ns tPLH Propagation Delay 3.0 5.3 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 5.0 13 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 2.0 13.5 2.0 12 2.0 5.6 7.5 2.0 10 2.0 8.5 1.5 4.5 6.5 1.5 10 1.5 7.5 1.5 3.8 6.0 1.5 7.0 1.5 6.0 tPZL tPHZ Output Disable Time tPLZ ns ns ns AC OPERATING REQUIREMENTS Symbol Parameter Min 54/74F 54F 74F TA = +25°C TA = –55°C to +125°C TA = 0°C to +70°C VCC = +5.0 V VCC = 5.0 V ± 10% VCC = 5.0 V ± 10% Typ Max Min Max 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 3.0 3.0 tw(H) LE Pulse Width, HIGH 6.0 6.0 6.0 FAST AND LS TTL DATA 4-169 Max Unit ns ns