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| MC54/74F521 8-BIT IDENTITY COMPARATOR The MC54/74F521 is an expandable 8-bit comparator. It compares two words of up to eight bits each and provides a LOW output when the two words match bit for bit. The expansion input IA = B also serves as an active-LOW enable input. * Compares Two 8-Bit Words in 6.5 ns Typical * Expandable to Any Word Length * 20-Pin Package CONNECTION DIAGRAM (TOP VIEW) VCC 20 OA = B 19 B7 18 A7 17 B6 16 A6 15 B5 14 A5 13 B4 12 A4 11 8-BIT IDENTITY COMPARATOR FASTTM SCHOTTKY TTL 20 1 J SUFFIX CERAMIC CASE 732-03 1 IA = B 2 A0 3 B0 4 A1 5 B1 6 A2 7 B2 8 A3 9 B3 10 GND 20 1 N SUFFIX PLASTIC CASE 738-03 20 1 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION MC54FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC GUARANTEED OPERATING RANGES Symbol VCC TA Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 IOH IOL Output Current High Output Current Low 54,74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -1.0 20 mA mA Unit V C FAST AND LS TTL DATA 4-195 MC54/74F521 LOGIC DIAGRAM A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 IA = B NOTE: This diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. LOGIC SYMBOL 1 IA = B B7 A7 B6 A6 B5 A5 B4 OA = B A4 B3 A3 B2 A2 B1 A1 B0 A0 VCC = PIN 20 GND = PIN 10 OA = B 19 18 17 16 15 14 13 12 11 9 8 7 6 5 4 3 2 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH PARAMETER Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 74 VOL Output LOW Voltage 2.5 2.7 3.4 3.4 0.35 0.5 20 IIH IIL IOS ICC Input HIGH Current Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current - 60 21 100 -0.6 -150 32 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A A mA mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = - 18 mA IOH = - 1.0 mA IOH = - 1.0 mA IOL = 20 mA VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VOUT = 0 V IA = B = GND VCC = MAX VCC = MAX VCC = MAX VCC = MIN VCC = 4.5 V VCC = 4.75 V VCC = MIN VCC = MAX NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 4-196 MC54/74F521 FUNCTION TABLE Inputs IA = B L L H H H = HIGH Voltage Level L = LOW Voltage Level *A0 = B0, A1 = B1, A2 = B2, etc. Output A, B A = B* AB A = B* AB OA = B L H H H AC CHARACTERISTICS 54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL Parameter Propagation Delay An or Bn to OA = B Propagation Delay IA = B to OA = B Min 2.5 3.0 2.5 3.5 Typ 6.5 6.5 4.5 5.0 Max 10 10 6.5 9.0 54F TA = -55C to +125C VCC = 5.0 V 10% CL= 50 pF Min 2.5 3.0 2.5 3.5 Max 15 12 8.5 10 74F TA = 0C to +70C VCC = 5.0 V 10% CL= 50 pF Min 2.5 3.0 2.5 3.5 Max 11 11 7.5 10 ns Unit ns Ripple Expansion A0 B0 ENABLE LOW ...... A7 B7 A8 B8 A15 B15 ....... IA = B OA = B OA = B A16 B16 A23 B23 ....... IA = B OA = B IA = B Parallel Expansion A0 B0 A7 B7 ...... IA = B OA = B A8 B8 A15 B15 ....... IA = B OA = B A16 B16 A23 B23 ....... IA = B OA = B Figure 1. Applications FAST AND LS TTL DATA 4-197 |
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