8-BIT IDENTITY COMPARATOR The MC74AC521/74ACT521 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 Typ Expandable to Any Word Length 20-Pin Package Outputs Source/Sink 24 mA ′ACT521 has TTL-Compatible Inputs VCC OA=B B7 A7 B6 A6 B5 A5 B4 A4 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 IA=B A0 B0 A1 B1 A2 B2 A3 B3 GND N SUFFIX CASE 738-03 PLASTIC DW SUFFIX CASE 751D-04 PLASTIC PIN NAMES A0–A7 B0–B7 IA=B OA=B Word A Inputs Word B Inputs Expansion or Enable Input Identity Output LOGIC SYMBOL TRUTH TABLE Inputs Outputs IA=B A, B OA=B L L H H A = B* A≠B A = B* A≠B L H H H B7 A7 B6 A6 B5 A5 B4 A4 B3 A3 B2 A2 B1 A1 B0 A0 IA=B OA=B H = HIGH Voltage Level L = LOW Voltage Level *A0=B0, A1=B1, A2=B2, etc. FACT DATA 5-1 MC74AC521 MC74ACT521 LOGIC DIAGRAM A0 B0 A1 B1 A2 B2 A3 B3 OA=B A4 B4 A5 B5 A6 B6 A7 B7 IA=B Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. MAXIMUM RATINGS* Symbol Parameter Value Unit VCC DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V Vin DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V Vout DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V Iin DC Input Current, per Pin ±20 mA Iout DC Output Sink/Source Current, per Pin ±50 mA ICC DC VCC or GND Current per Output Pin ±50 mA Tstg Storage Temperature –65 to +150 °C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. FACT DATA 5-2 MC74AC521 MC74ACT521 RECOMMENDED OPERATING CONDITIONS Symbol Parameter VCC Supply Voltage Vin, Vout DC Input Voltage, Output Voltage (Ref. to GND) tr, tf Input Rise and Fall Time (Note 2) ′ACT Devices except Schmitt Inputs TJ Junction Temperature (PDIP) TA Operating Ambient Temperature Range IOH IOL Typ Max ′AC 2.0 5.0 6.0 ′ACT 4.5 5.0 5.5 0 Input Rise and Fall Time (Note 1) ′AC Devices except Schmitt Inputs tr, tf Min Unit V VCC VCC @ 3.0 V 150 VCC @ 4.5 V 40 VCC @ 5.5 V 25 VCC @ 4.5 V 10 VCC @ 5.5 V 8.0 V ns/V ns/V 140 °C 85 °C Output Current — High –24 mA Output Current — Low 24 mA –40 25 1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times. 2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times. DC CHARACTERISTICS Symbol Parameter VCC (V) 74AC 74AC TA = +25°C TA = –40°C to +85°C Typ VIH VIL VOH 1.5 2.25 2.75 2.1 3.15 3.85 2.1 3.15 3.85 V VOUT = 0.1 V or VCC – 0.1 V Maximum Low Level Input Voltage 3.0 4.5 5.5 1.5 2.25 2.75 0.9 1.35 1.65 0.9 1.35 1.65 V VOUT = 0.1 V or VCC – 0.1 V Minimum High Level Output Voltage 3.0 4.5 5.5 2.99 4.49 5.49 2.9 4.4 5.4 2.9 4.4 5.4 V 2.56 3.86 4.86 2.46 3.76 4.76 0.1 0.1 0.1 0.1 0.1 0.1 3.0 4.5 5.5 0.36 0.36 0.36 0.44 0.44 0.44 5.5 ±0.1 Maximum Low Level Output Voltage Maximum Input Leakage Current IOLD †Minimum Dynamic Output Current ICC Guaranteed Limits 3.0 4.5 5.5 IIN IOHD Conditions Minimum High Level Input Voltage 3.0 4.5 5.5 VOL Unit Maximum Quiescent Supply Current 3.0 4.5 5.5 0.002 0.001 0.001 IOUT = –50 µA V *VIN = VIL or VIH –12 mA IOH –24 mA –24 mA IOUT = 50 µA V V *VIN = VIL or VIH 12 mA IOL 24 mA 24 mA ±1.0 µA VI = VCC, GND 5.5 75 mA VOLD = 1.65 V Max 5.5 –75 mA VOHD = 3.85 V Min 80 µA VIN = VCC or GND 5.5 8.0 * All outputs loaded; thresholds on input associated with output under test. † Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC. FACT DATA 5-3 MC74AC521 MC74ACT521 AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) Symbol VCC* (V) Parameter Min 74AC 74AC TA = +25°C CL = 50 pF TA = –40°C to +85°C CL = 50 pF Typ Max Min Max Unit Fig. No. tPLH Propagation Delay An or Bn to OA=B 3.3 5.0 3.5 2.5 11 8.0 3.0 2.0 12 9.0 ns 3-6 tPHL Propagation Delay An or Bn to OA=B 3.3 5.0 4.5 3.0 11.5 8.5 3.5 2.5 12.5 9.0 ns 3-6 tPLH Propagation Delay IA=B to OA=B 3.3 5.0 3.0 2.5 8.0 6.0 2.5 2.0 9.0 7.0 ns 3-6 tPHL Propagation Delay IA=B to OA=B 3.3 5.0 3.0 2.0 8.0 6.0 2.5 2.0 9.0 7.0 ns 3-6 * Voltage Range 3.3 V is 3.3 V ±0.3 V. Voltage Range 5.0 V is 5.0 V ±0.5 V. DC CHARACTERISTICS Symbol Parameter VCC (V) 74ACT 74ACT TA = +25°C TA = –40°C to +85°C Typ Guaranteed Limits Unit Conditions VIH Minimum High Level Input Voltage 4.5 5.5 1.5 1.5 2.0 2.0 2.0 2.0 V VOUT = 0.1 V or VCC – 0.1 V VIL Maximum Low Level Input Voltage 4.5 5.5 1.5 1.5 0.8 0.8 0.8 0.8 V VOUT = 0.1 V or VCC – 0.1 V VOH Minimum High Level Output Voltage 4.5 5.5 4.49 5.49 4.4 5.4 4.4 5.4 V 3.86 4.86 3.76 4.76 0.1 0.1 0.1 0.1 4.5 5.5 0.36 0.36 0.44 0.44 V *VIN = VIL or VIH 24 mA IOL 24 mA ±0.1 ±1.0 µA VI = VCC, GND 1.5 mA VI = VCC – 2.1 V 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 0.001 0.001 V V IOUT = –50 µA *VIN = VIL or VIH –24 mA IOH –24 mA IOUT = 50 µA IIN Maximum Input Leakage Current 5.5 ∆ICCT Additional Max. ICC/Input 5.5 IOLD †Minimum Dynamic Output Current 5.5 75 mA VOLD = 1.65 V Max 5.5 –75 mA VOHD = 3.85 V Min 80 µA VIN = VCC or GND IOHD ICC Maximum Quiescent Supply Current 0.6 5.5 8.0 * All outputs loaded; thresholds on input associated with output under test. † Maximum test duration 2.0 ms, one output loaded at a time. FACT DATA 5-4 MC74AC521 MC74ACT521 AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) Symbol VCC* (V) Parameter 74ACT 74ACT TA = +25°C CL = 50 pF TA = –40°C to +85°C CL = 50 pF Min Typ Max Min Max Unit Fig. No. tPLH Propagation Delay An or Bn to OA=B 5.0 3.0 9.0 2.5 9.5 ns 3-6 tPHL Propagation Delay An or Bn to OA=B 5.0 3.0 10 2.5 11 ns 3-6 tPLH Propagation Delay IA=B to OA=B 5.0 2.0 6.5 2.0 7.0 ns 3-6 tPHL Propagation Delay IA=B to OA=B 5.0 2.5 7.5 2.0 8.0 ns 3-6 * Voltage Range 5.0 V is 5.0 V ±0.5 V. CAPACITANCE Symbol Parameter Value Typ Unit Test Conditions CIN Input Capacitance 4.5 pF VCC = 5.0 V CPD Power Dissipation Capacitance 40 pF VCC = 5.0 V APPLICATIONS RIPPLE EXPANSION A0 B0 ENABLE LOW IA=B ........ A7 B7 A8 B8 IA=B OA=B A15 B15 A16 B16 A23 B23 ........ ........ IA=B OA=B OA=B PARALLEL EXPANSION A0 B0 ENABLE LOW IA=B ........ OA=B A7 B7 A8 B8 A15 B15 A16 B16 ........ IA=B OA=B FACT DATA 5-5 A23 B23 ........ IA=B OA=B MC74AC521 MC74ACT521 OUTLINE DIMENSIONS N SUFFIX PLASTIC DIP PACKAGE CASE 738–03 ISSUE E –A– 20 11 1 10 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. B L C –T– K SEATING PLANE M N E G F J D 20 PL 0.25 (0.010) 20 PL 0.25 (0.010) M T A M M DW SUFFIX PLASTIC SOIC PACKAGE CASE 751D–04 ISSUE E –A– 20 11 –B– 10X P 0.010 (0.25) 1 M B M 10 20X J D 0.010 (0.25) M T A B S S F R X 45 _ C –T– 18X G SEATING PLANE K T B M DIM A B C D E F G J K L M N INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0_ 15 _ 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.150 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 12.65 12.95 0.499 0.510 B 7.40 7.60 0.292 0.299 C 2.35 2.65 0.093 0.104 D 0.35 0.49 0.014 0.019 F 0.50 0.90 0.020 0.035 G 1.27 BSC 0.050 BSC J 0.25 0.32 0.010 0.012 K 0.10 0.25 0.004 0.009 M 0_ 7_ 0_ 7_ P 10.05 10.55 0.395 0.415 R 0.25 0.75 0.010 0.029 M Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. 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Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA/EUROPE: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, Toshikatsu Otsuki, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–3521–8315 MFAX: [email protected] –TOUCHTONE (602) 244–6609 INTERNET: http://Design–NET.com HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 ◊ FACT DATA 5-6 *MC74AC521/D* MC74AC521/D